WO2023169576A1

WO2023169576A1 - Fresh air system capable of deep heat recovery and anti-freezing control method therefor

Info

Publication number: WO2023169576A1
Application number: PCT/CN2023/080947
Authority: WO
Inventors: 郭占庚; 徐宏江
Original assignee: 森德(中国)暖通设备有限公司; 大厂森德暖通设备有限公司; 森德集团国际股份公司
Priority date: 2022-03-10
Filing date: 2023-03-10
Publication date: 2023-09-14
Also published as: CN116734371A

Abstract

The present application provides a fresh air system capable of deep heat recovery and an anti-freezing control method therefor. The fresh air system capable of deep heat recovery comprises an indoor dirty air treatment subsystem, an indoor clean air treatment subsystem, and a heat recovery device. The method comprises: when the outdoor environment temperature is lower than a preset temperature threshold, detecting whether there is an ice-forming layer inside an air exhaust side of the heat recovery device; if there is no ice-forming layer or the thickness of the ice-forming layer is smaller than a preset thickness threshold, controlling the fresh air system capable of deep heat recovery to operate according to control parameters currently set by a user; and if there is an ice-forming layer and the thickness of the ice-forming layer is greater than or equal to the preset thickness threshold, executing a preset deicing operation, and after the deicing operation is completed, returning to detect whether there is an ice-forming layer inside the air exhaust side of the heat recovery device. According to the present application, the low-temperature application range of the fresh air system having the heat recovery device can be expanded, thereby effectively improving the heat exchange efficiency of the fresh air system, and reducing the energy consumption of the fresh air system.

Description

Deep heat recovery fresh air system and its antifreeze control method

This application requires the priority of the Chinese patent application submitted to the China Patent Office on March 10, 2022, with the application number 202210240927.7 and the invention name "Anti-freeze control method applied to deep heat recovery fresh air system", and in November 2022 The priority of the Chinese patent application submitted to the China Patent Office on the 29th with the application number 202211511419.4 and the invention name "Deep Heat Recovery Fresh Air System and Antifreeze Control Method", the entire content of which is incorporated into this application by reference.

Technical field

This application relates to the technical field of fresh air systems, and in particular to a deep heat recovery fresh air system and its antifreeze control method.

Background technique

The fresh air system renews indoor air by replacing or partially replacing indoor air with outdoor air. Since there is a certain temperature difference between indoor air and outdoor air in most cases, existing fresh air systems are usually equipped with heat recovery devices while ensuring constant indoor temperature and humidity. For example, when the outdoor air is lower than the indoor air, the heat recovery device can use the hot indoor air that is about to be exhausted to preheat the cold air that is about to enter the room, thereby reducing energy consumption.

However, when the outdoor temperature is low (for example, below -5°C), when the hot indoor air that is about to be discharged encounters the cold air that is about to enter the room, it can easily cause the inside of the exhaust side of the heat recovery device to freeze, thereby affecting the thermal performance. The heat exchange efficiency of the recovery device may even cause the heat recovery device to be frozen.

For the application of small fresh air systems, there are usually two traditional solutions. One is to heat the outdoor cold air to a certain temperature (such as above 0°C) when the outdoor temperature is low, and then send it to the heat recovery device. Although this solution can avoid the problem of freezing caused by internal ice on the exhaust side of the heat recovery device, it will reduce the heat recovered by the heat recovery device and increase the energy consumption of the building's fresh air system. The other is an ice melting solution that uses intermittent ventilation, allowing the fresh air and exhaust air from the heat recovery device to operate intermittently during ice melting. The biggest disadvantage of this solution is that the indoor air entering and the outdoor air being discharged cannot be balanced in real time during ice melting, which seriously restricts the promotion and application of this type of fresh air system in energy-saving buildings, especially green buildings with very good air tightness.

Contents of the invention

This application provides a deep heat recovery fresh air system and its antifreeze control method. When the outdoor temperature is low, fresh air heat recovery (ie, deep heat recovery) can still be performed, which can reduce the minimum operating temperature of the fresh air system and expand the scope of small heat recovery. The temperature application range of the device enables full heat recovery of fresh air and exhaust air, which can effectively improve the heat recovery efficiency and ensure the safety of the heat recovery device, and can effectively reduce the comprehensive energy consumption of the fresh air system. Among them, this application provides a solution for fresh air products with heat recovery devices: even during the defrosting or de-icing process, the balance of fresh air entering the room and exhaust air discharged from the room can be maintained. The application of this solution will enable fresh air products to meet the requirements of green buildings for maintaining a balance between fresh air and exhaust air, which will also promote the wider use of fresh air products in this field.

In the first aspect, embodiments of the present application provide an antifreeze control method applied to a deep heat recovery fresh air system. The deep heat recovery fresh air system includes an indoor dirty air treatment subsystem and an indoor clean air treatment subsystem. The indoor clean air treatment subsystem Both the air treatment subsystem and the indoor dirty air treatment subsystem include a heat recovery device; the indoor dirty air treatment subsystem The indoor clean air treatment subsystem is used to discharge the first heat transfer air formed after treating the dirty air in the indoor dirty space to the outside; the indoor clean air treatment subsystem is used to mix and process the clean air in the indoor clean space and the fresh outdoor air to form The circulating clean air is sent to the indoor space; the heat recovery device is used to pass the first filtered air formed after processing by the indoor dirty air treatment subsystem and the fresh air entering from the outside in the indoor clean air treatment subsystem. The second filtered air formed after the filtration process transfers heat;

The antifreeze control method includes:

When the outdoor ambient temperature is lower than the preset temperature threshold, detect whether there is an ice layer inside the exhaust side of the heat recovery device;

If there is no icing layer inside the exhaust side of the heat recovery device, or the thickness of the existing icing layer is less than the preset thickness threshold, the operation of the deep heat recovery fresh air system is controlled according to the control parameters currently set by the user;

If there is an icing layer inside the exhaust side of the heat recovery device, and the thickness of the existing icing layer is greater than or equal to the preset thickness threshold, a preset de-icing operation is performed, and during the de-icing operation After completion, return to detect whether there is an ice layer inside the exhaust side of the heat recovery device.

In a feasible implementation, the deep heat recovery fresh air system also includes an icing detection subsystem, and the icing detection subsystem includes at least one pressure difference sensor;

The detection of whether there is an icing layer inside the exhaust side of the heat recovery device includes:

Utilize the at least one differential pressure sensor to detect the wind resistance of the first heat transfer air discharged from the indoor dirty air treatment subsystem when it flows through the heat recovery device;

When the wind resistance is less than the preset wind resistance threshold, it is determined that there is no icing layer inside the exhaust side of the heat recovery device, or the thickness of the existing icing layer is less than the preset thickness threshold;

When the wind resistance is greater than or equal to the preset wind resistance threshold, it is determined that an icing layer exists inside the exhaust side of the heat recovery device, and the thickness of the existing icing layer is greater than or equal to the preset thickness threshold.

In a feasible implementation, the deep heat recovery fresh air system also includes an icing detection subsystem, and the icing detection subsystem includes a plurality of temperature sensors;

Utilize the plurality of temperature sensors to detect the heat exchange efficiency of the heat recovery device;

When the heat exchange efficiency of the heat recovery device is greater than the preset efficiency threshold, or when the heat exchange efficiency of the heat recovery device decreases compared to the heat exchange efficiency of the initial ice-free state is less than the preset threshold, it is determined that the There is no icing layer inside the exhaust side of the heat recovery device, or the thickness of the existing icing layer is less than the preset thickness threshold;

When the heat exchange efficiency of the heat recovery device is less than or equal to the preset efficiency threshold, or when the heat exchange efficiency of the heat recovery device decreases compared to the heat exchange efficiency in the initial ice-free state is greater than or equal to the When the threshold is preset, it is determined that there is an icing layer inside the exhaust side of the heat recovery device, and the thickness of the icing layer is greater than or equal to the preset thickness threshold.

In a possible implementation, performing a preset de-icing operation includes:

The flow rate of fresh air in the indoor clean air treatment subsystem and the gas flow rate in the indoor dirty air treatment subsystem are reduced according to a preset reduction amplitude.

In a feasible implementation, the deep heat recovery fresh air system also includes a deicing subsystem, and the deicing subsystem includes a fresh air preheating device; performing a preset deicing operation includes:

The fresh air preheating device is controlled to heat the fresh air introduced from the outdoors by the indoor clean air treatment subsystem.

In a feasible implementation, the fresh air preheating device is an electric heating device or a preheating coil.

In a feasible implementation, the deicing subsystem also includes a fresh air bypass component; performing a preset deicing operation includes:

The fresh air bypass assembly is used to allow the heated fresh air to be sent into the indoor space without passing through the heat recovery device.

In a feasible implementation, the de-icing subsystem further includes a reheating device for heating the gas sent into the indoor space; performing a preset de-icing operation includes:

According to the temperature and set value of the fresh air introduced from the outside by the indoor clean air treatment subsystem, the heating power of the reheating device is adjusted so that the temperature of the gas sent to the indoor space is within the preset temperature range. Inside.

In a feasible implementation, adjusting the heating power of the reheating device according to the temperature and set value of the fresh air introduced from the outdoors by the indoor clean air treatment subsystem includes:

When the heating power of the reheating device is adjusted to the maximum power, if the temperature of the gas sent to the indoor space is not within the preset temperature range, the indoor clean air will be reduced according to the preset reduction range. The flow rate of fresh air in the treatment subsystem and the gas flow rate of the indoor dirty air treatment subsystem.

In a possible implementation, the reheating device is an electric heating device or a reheating coil.

In a possible implementation, performing a preset de-icing operation further includes:

The indoor clean air treatment subsystem is controlled so that the clean air in the indoor clean space flows through the heat recovery device for de-icing and then is sent into the indoor space.

In a feasible implementation, the deep heat recovery fresh air system also includes a water receiving tray located below the exhaust outlet of the heat recovery device for collecting water after deicing. Side by side to the indoor pipe network.

In the second aspect, embodiments of the present application provide a deep heat recovery fresh air system. The deep heat recovery fresh air system includes an indoor dirty air treatment subsystem, an indoor clean air treatment subsystem, an icing detection subsystem, and a deicing subsystem. Both the indoor clean air treatment subsystem and the indoor dirty air treatment subsystem include heat recovery devices;

The indoor dirty air treatment subsystem is used to discharge the first heat transfer air formed after treating the dirty air in the indoor dirty space to the outdoors;

The indoor clean air treatment subsystem is used to deliver the circulating clean air formed by mixing and processing the clean air in the indoor clean space and the fresh outdoor air to the indoor space;

The heat recovery device is used to combine the first filtered air formed after processing by the indoor dirty air treatment subsystem and the second filtered air formed after filtering the fresh air entering from the outside in the indoor clean air treatment subsystem. carry out heat transfer;

The ice detection subsystem is used to detect whether there is an ice layer inside the exhaust side of the heat recovery device when the outdoor ambient temperature is lower than a preset temperature threshold;

The de-icing subsystem is used to control the de-icing subsystem according to the control parameters currently set by the user if there is no icing layer inside the exhaust side of the heat recovery device, or the thickness of the existing icing layer is less than the preset thickness threshold. The deep heat recovery fresh air system is running; if there is an icing layer inside the exhaust side of the heat recovery device, and the thickness of the existing icing layer is greater than or equal to the preset thickness threshold, a preset de-icing operation is performed.

In a possible implementation, the ice detection subsystem includes at least one pressure difference sensor for detecting when the indoor dirty air treatment subsystem discharges the first heat transfer air and flows through the heat recovery device. wind resistance;

In a feasible implementation, the ice detection subsystem includes a plurality of temperature sensors for detecting the heat exchange efficiency of the heat recovery device;

In a feasible implementation, the de-icing subsystem is used for:

When there is an icing layer inside the exhaust side of the heat recovery device, and the thickness of the existing icing layer is greater than or equal to the preset thickness threshold, the indoor clean air treatment element is reduced according to the preset reduction range. The flow rate of fresh air in the system and the gas flow rate in the indoor dirty air treatment subsystem.

In a feasible implementation, the deicing subsystem also includes a fresh air preheating device for:

When there is an icing layer inside the exhaust side of the heat recovery device, and the thickness of the existing icing layer is greater than or equal to the preset thickness threshold, the fresh air preheating device is controlled to treat the indoor clean air. The system is heated by fresh air brought in from outside.

In a feasible implementation, the deicing subsystem also includes a fresh air bypass component; the deicing subsystem is used for:

When there is an icing layer inside the exhaust side of the heat recovery device, and the thickness of the existing icing layer is greater than or equal to the preset thickness threshold, the fresh air bypass component is used to make the heated fresh air Air is fed into the indoor space without passing through the heat recovery device.

In a feasible implementation, the deicing subsystem further includes a reheating device; the deicing subsystem is used for:

When there is an icing layer inside the exhaust side of the heat recovery device, and the thickness of the existing icing layer is greater than or equal to the preset thickness threshold, the fresh air introduced from the outdoors according to the indoor clean air treatment subsystem The temperature and set value are adjusted to adjust the heating power of the reheating device so that the temperature of the gas sent into the indoor space is within the preset temperature range.

In a feasible implementation, the de-icing subsystem is also used to:

In a feasible implementation, the indoor dirty air treatment subsystem includes: a dirty air inlet, a dirty air inlet damper, a dirty air filter, an exhaust fan, an exhaust valve, and an exhaust outlet;

The dirty air inlet is used to introduce dirty air from the indoor dirty space;

The dirty air inlet damper is used to close or adjust the flow of dirty air entering from the indoor dirty space;

The dirty air filter is used to filter the dirty air to form the first filtered air;

The exhaust fan is used to guide the first heat transfer air formed after the first filtered air passes through the heat recovery device to the exhaust port;

The exhaust valve is used to close the exhaust duct from indoor to outdoor;

The air outlet is used to discharge the first heat transfer air to the outdoors.

In a feasible implementation, the indoor clean air treatment subsystem includes: a fresh air outlet, a fresh air valve, a fresh air filter, a clean air return outlet, a clean air return valve, a clean air filter, a circulating fan, and a high-efficiency filter air reprocessing device, clean air supply outlet;

The new air outlet is used to introduce fresh air from the outside;

The fresh air valve is used to close the passage for outdoor air to enter the room or to adjust the flow rate of fresh air entering the room;

The fresh air filter is used to filter the fresh air to form the second filtered air;

The clean air return air outlet is used to introduce clean air from the indoor clean space;

The clean air return valve is used to close the indoor clean air channel or adjust the indoor clean air flow rate;

The clean air filter is used to filter the clean air to form third filtered air;

The circulation fan is used to send the second heat transfer air formed after the second filtered air passes through the heat recovery device and the circulating clean air formed after mixing the third filtered air to the clean air supply port. ;

The high-efficiency filter is used to filter the air mixed with the second filtered air and the third filtered air to form fourth filtered air;

The air reprocessing device is used to reprocess the fourth filtered air;

The clean air supply outlet is used to send the circulating clean air to the indoor space.

In a feasible implementation, the deicing subsystem further includes a first bypass ventilation valve and a second bypass ventilation valve; the deicing subsystem is used for:

When there is an icing layer inside the exhaust side of the heat recovery device, and the thickness of the existing icing layer is greater than or equal to the preset thickness threshold, the clean air return valve and the first bypass ventilation are opened. valve, the exhaust fan, the second bypass ventilation valve, the fresh air valve, and the circulation fan; close the dirty air inlet air valve, the exhaust valve, and the fresh air valve.

In the third aspect, embodiments of the present application provide a deep heat recovery fresh air system. The deep heat recovery fresh air system includes an indoor return air subsystem, an indoor return air treatment subsystem, a fresh air treatment subsystem, an icing detection subsystem, and De-icing subsystem, the fresh air treatment subsystem and the indoor return air treatment subsystem both include heat recovery devices;

The indoor return air subsystem is used to distinguish indoor dirty air and indoor clean air in the indoor return air area;

The indoor return air treatment subsystem is used to discharge the first heat transfer air formed after indoor return air treatment to the outdoors;

The fresh air treatment subsystem is used to process outdoor fresh air to form second filtered air and send it to the indoor space;

The heat recovery device is used to transfer heat between the first filtered air and the second filtered air;

In a feasible implementation, the indoor return air subsystem includes an indoor dirty air subsystem and an indoor clean air subsystem;

The indoor dirty air subsystem at least includes a dirty air ventilation duct and a dirty air damper;

The indoor clean air subsystem at least includes a clean air ventilation duct and a clean air damper.

In a feasible implementation, the indoor return air treatment subsystem includes an exhaust fan and an exhaust damper;

The fresh air treatment subsystem includes a fresh air valve, a fresh air bypass ventilation valve, and an air supply fan.

In a feasible implementation, the de-icing subsystem also includes a second defrost bypass ventilation valve; the de-icing sub-system is used for:

When there is an icing layer inside the exhaust side of the heat recovery device, and the thickness of the existing icing layer is greater than or equal to the preset thickness threshold, the clean air damper, the exhaust fan, and the Defrost the second bypass ventilation valve and the air blower; close the dirty air damper, the exhaust damper, the fresh air valve, and the fresh air bypass ventilation valve.

The deep heat recovery fresh air system and its antifreeze control method provided by the embodiments of this application, when the outdoor temperature is low, if there is no icing layer inside the exhaust side of the heat recovery device, or the thickness of the existing icing layer is less than the preset Thickness threshold, then control the operation of the deep heat recovery fresh air system according to the control parameters currently set by the user; if there is an icing layer inside the exhaust side of the heat recovery device, and the thickness of the existing icing layer is greater than or equal to the preset If the thickness threshold is reached, the preset de-icing operation will be performed, and after the de-icing operation is completed, it will return to detect whether there is an icing layer inside the exhaust side of the heat recovery device. This will not only fully recover the heat of the gas discharged to the outside, but also improve the fresh air system. The heat exchange efficiency can also reduce the energy consumption of the fresh air system.

Description of the drawings

Figure 1 is a schematic structural diagram of a deep heat recovery fresh air system provided by an embodiment of the present application;

Figure 2 is a schematic structural diagram 2 of a deep heat recovery fresh air system provided by an embodiment of the present application;

Figure 3 is a schematic structural diagram of a deep heat recovery fresh air system provided by an embodiment of the present application;

Figure 4 is a schematic structural diagram 4 of a deep heat recovery fresh air system provided by an embodiment of the present application;

Figure 5 is a schematic flow chart 1 of an antifreeze control method applied to a deep heat recovery fresh air system provided by an embodiment of the present application;

Figure 6 is a schematic flow chart 2 of an antifreeze control method applied to a deep heat recovery fresh air system provided by an embodiment of the present application;

Figure 7 is a schematic flowchart three of an antifreeze control method applied to a deep heat recovery fresh air system provided by an embodiment of the present application;

Figure 8 is a schematic flow chart 4 of an antifreeze control method applied to a deep heat recovery fresh air system provided by an embodiment of the present application;

Figure 9 is a schematic flow chart 5 of an antifreeze control method applied to a deep heat recovery fresh air system provided by an embodiment of the present application;

Figure 10 is a schematic structural diagram 5 of a deep heat recovery fresh air system provided by an embodiment of the present application.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments These are part of the embodiments of this application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application. In addition, although the disclosure in this application is introduced in terms of one or several exemplary examples, it should be understood that each aspect of these disclosures can also individually constitute a complete embodiment.

It should be noted that the brief description of terms in this application is only to facilitate understanding of the embodiments described below, and is not intended to limit the embodiments of this application. Unless otherwise stated, these terms should be understood according to their ordinary and usual meaning.

The terms "first", "second", etc. in the description and claims of this application and the above-mentioned drawings are used to distinguish similar or similar objects or entities, and do not necessarily mean to limit a specific order or sequence. Unless otherwise noted. It is to be understood that the terms so used are interchangeable under appropriate circumstances and, for example, can be implemented in an order other than that shown or described in accordance with the embodiments of the present application.

In addition, the terms "including" and "having" and any variations thereof are intended to cover but not exclusively include, for example, a product or device that includes a range of components need not be limited to those components explicitly listed, but may include There are other components not expressly listed or inherent to these products or devices.

The term "module", as used in this application, means any known or later developed hardware, software, firmware, artificial intelligence, fuzzy logic or combination of hardware or/and software code capable of performing the function associated with that element.

With the implementation of energy conservation and emission reduction policies and the frequent occurrence of dust, sand and haze weather in recent years, people's understanding of indoor air environment has gradually changed. In order to meet people's needs for working and living in a comfortable and healthy indoor air environment, various fresh air systems have gradually appeared on the market.

However, when the outdoor temperature is low (for example, below -5°C), when the hot indoor air that is about to be discharged encounters the cold air that is about to enter the room, it can easily cause the inside of the exhaust side of the heat recovery device to freeze, thereby affecting the thermal performance. The heat exchange efficiency of the recovery device may even cause it to freeze.

For the application of small fresh air systems, there are usually two traditional solutions. One is to heat the outdoor cold air to a certain temperature (such as above 0°C) when the outdoor temperature is low, and then send it to the heat recovery device. Although this solution can avoid the problem of freezing caused by internal ice on the exhaust side of the heat recovery device, it will reduce the heat recovered by the heat recovery device and increase the energy consumption of the building's fresh air system. The other is an ice melting solution that uses intermittent ventilation, allowing the fresh air and exhaust air from the heat recovery device to operate intermittently during ice melting. The biggest disadvantage of this solution is that it goes indoors when the ice melts The air and discharged outdoor air cannot guarantee real-time balance, which seriously restricts the promotion and application of this type of fresh air system in energy-saving buildings, especially green buildings with very good air tightness.

Faced with the above technical problems, embodiments of the present application provide a deep heat recovery fresh air system and its antifreeze control method. When the outdoor temperature is low, the fresh air system is first controlled according to the control parameters currently set by the user, and simultaneously detects Whether there is an icing layer inside the exhaust side of the heat recovery device; when it is detected that there is an icing layer inside the exhaust side of the heat recovery device, and the thickness of the existing icing layer is greater than or equal to the preset thickness threshold, de-icing is performed Operation; after de-icing, the fresh air system will still be controlled according to the control parameters currently set by the user, and continue to detect whether there is an ice layer inside the exhaust side of the heat recovery device. The embodiments of the present application can not only fully recover the heat of the gas discharged outdoors, improve the heat exchange efficiency of the fresh air system, but also reduce the energy consumption of the fresh air system. Detailed examples are used for detailed description below.

Referring to Figure 1, Figure 1 is a schematic structural diagram of a deep heat recovery fresh air system provided by an embodiment of the present application. In some embodiments, the above-mentioned deep heat recovery fresh air system includes: an indoor dirty air treatment subsystem and an indoor clean air treatment subsystem. The indoor dirty air treatment subsystem and the indoor clean air treatment subsystem each include a heat recovery device 1 .

Among them, in Figure 1 The path formed is the path in which the dirty air flows through the indoor dirty air treatment subsystem and is processed by the indoor dirty air treatment subsystem, so it is The various components flowing through the path constitute the indoor dirty air treatment subsystem. The path formed is a path in which the clean air in the indoor clean air space flows through the indoor clean air treatment subsystem and is processed by the indoor clean air treatment subsystem; The path formed is the path in which outdoor fresh air flows through the indoor clean air treatment subsystem and is processed by the indoor clean air treatment subsystem; The path formed is a path in which the clean air in the indoor clean air space and the outdoor fresh air are mixed, flow through the indoor clean air treatment subsystem, and are processed by the indoor clean air treatment subsystem, so it is and The various components flowing through the constituted path constitute the indoor clean air treatment subsystem.

In some embodiments, the indoor dirty air treatment subsystem is used to discharge the first heat transfer air formed after treating the dirty air in the indoor dirty air space to the outdoors.

Among them, the first heat transfer air is the air output by the indoor dirty air treatment subsystem and finally discharged to the outdoors.

Optionally, the indoor dirty air space can be a kitchen, a bathroom, etc., which is not limited in this embodiment.

The indoor clean air treatment subsystem is used to mix the clean air in the indoor clean space with the fresh outdoor air. The resulting clean air is filtered by a high-efficiency filter and sent to the indoor space.

The indoor clean air space may be a bedroom, study room, living room, etc., which is not limited in this embodiment.

The indoor space is a general term for any one or more local spaces in the room that can be ventilated, which is not limited in this embodiment.

The heat recovery device 1 is used to transfer heat between the first filtered air formed by processing in the indoor dirty air treatment subsystem and the second filtered air formed by filtering the fresh air entering from the outside in the indoor clean air treatment subsystem.

The first filtered air is air formed by filtering dirty air, and the second filtered air is air formed by filtering fresh outdoor air.

The heat recovery device 1 is used for heat transfer between air and air, and the type of the heat recovery device 1 is not limited in this embodiment.

The indoor dirty air treatment subsystem includes filtration processing, heat exchange processing, etc. when processing the dirty air in the indoor dirty air space.

The indoor clean air processing subsystem includes filtration processing, heat exchange processing, mixing processing, etc. when mixing the clean air in the indoor clean air space with the fresh outdoor air.

It can be understood that due to the heat recovery devices installed in the above two subsystems, heat is transferred between the first filtered air formed by processing the dirty air before it is discharged outdoors and the second filtered air formed by processing the fresh air before entering the indoor clean space. , with energy recovery function.

Referring to Figure 2, Figure 2 is a schematic structural diagram 2 of a deep heat recovery fresh air system provided by an embodiment of the present application. In some embodiments, the above-mentioned deep heat recovery fresh air system includes an indoor dirty air treatment subsystem and an indoor clean air treatment subsystem. system.

Among them, in addition to the heat recovery device 1, the indoor dirty air treatment subsystem also includes: a dirty air inlet 2, a dirty air filter 3, an exhaust fan 4 and an exhaust outlet 5. In addition to the heat recovery device 1, the indoor clean air treatment subsystem also includes: fresh air outlet 6, fresh air filter 7, clean air return outlet 8, clean air filter 9, circulation fan 10 and clean air supply outlet 11.

Specifically, in the indoor dirty air treatment subsystem, the dirty air inlet 2 is used to introduce dirty air from the indoor dirty air space; the dirty air filter 3 is used to filter the dirty air to form the first filtered air; the exhaust air The fan 4 is used to guide the first heat transfer air formed after the first filtered air passes through the air energy heat exchanger to the exhaust port 5; the exhaust port 5 is used to discharge the first heat transfer air to the outdoors.

In the indoor clean air treatment subsystem, the fresh air outlet 6 is used to introduce fresh air from the outside; the fresh air filter 7 is used to filter the fresh air to form second filtered air; the clean air return outlet 8 is used to purify the indoor air The clean air is introduced into the space; the clean air filter 9 is used to filter the clean air to form the third filtered air; the circulation fan 10 is used to combine the second heat transfer air formed after the second filtered air passes through the heat recovery device 1 with the third filtered air. The circulating clean air formed after the mixing process of the three filtered air is sent to the clean air supply port 11; the clean air supply port 11 is used to send the circulating clean air to the indoor clean air space.

Among them, the indoor dirty air treatment subsystem, which is composed of a heat recovery device, a dirty air inlet, a dirty air filter, an exhaust fan and an exhaust outlet, completes the filtration, heat exchange and discharge of indoor dirty air space to the outside. , after the above treatment, the indoor dirty air space is introduced into the clean air from the indoor clean space, and the energy of the air discharged from the indoor dirty air treatment subsystem is recovered, achieving the effect of energy saving and emission reduction.

The indoor clean air treatment subsystem consists of an air energy heat exchanger, fresh air outlet, fresh air filter, clean air return outlet, clean air filter, circulation fan and clean air supply outlet. It completes the filtration of fresh air and indoor cleaning. Air filtration, heat exchange of filtered fresh air, mixing of the heat exchanged fresh air with filtered indoor clean air, and recycling to the indoor clean space. After the above processing, the air in the indoor clean air space is circulated. flow state and achieve energy saving effect.

In some embodiments, the indoor clean air treatment subsystem further includes: a heat exchange coil or an evaporator or a condenser.

When the indoor clean air treatment subsystem includes a heat exchange coil 12, there is a heat exchange circulation medium in the heat exchange coil 12. The heat exchange circulation medium can be cold water or hot water or other liquids, which is not limited in this embodiment. Among them, the heat exchange coil 12 is used to transfer heat between the mixed second heat transfer air and the third filtered air and the heat exchange medium to form circulating clean air.

When the indoor clean air treatment subsystem includes an evaporator 12, the evaporator 12 is used to cool down or dehumidify the mixed second heat transfer air and the third filtered air to form circulating clean air.

When the indoor clean air treatment subsystem includes a condenser 12, the condenser 12 is used to heat the mixed second heat transfer air and the third filtered air to form circulating clean air.

In this embodiment, after the second heat transfer air and the third filtered air are mixed, heat is transferred between the mixed second heat transfer air and the third filtered air and the heat exchange medium in the heat exchange coil, or through evaporation The indoor air treatment system can bear part or all of the air conditioning load, so that the temperature and humidity of the air entering the indoor space are more suitable.

Optionally, the indoor clean air treatment subsystem also includes a filter 13 . Among them, the filter 13 is used to filter the circulating clean air so that the air passing through the clean air supply outlet is free of particles and odor.

Furthermore, the indoor clean air treatment subsystem also includes a fresh air volume control valve 14 and an indoor clean air volume control valve 15 .

Among them, the fresh air volume regulating valve 14 is used to adjust the fresh air flow rate of the fresh air outlet. The indoor clean air volume regulating valve 15 is used to regulate the clean air flow rate at the clean air return outlet.

In this embodiment, by setting the fresh air volume control valve and the indoor clean air volume control valve in the indoor clean air treatment subsystem, the fresh air flow rate and the clean air flow rate can be adjusted respectively according to user needs.

In some embodiments, the above-mentioned deep heat recovery fresh air system includes: fresh air ducts, supply air ducts, return air ducts, exhaust air ducts, and heat recovery devices; wherein the return air ducts and exhaust air ducts are used to discharge indoor air to the outdoors. , the fresh air duct and supply air duct are used to send outdoor air into the room; the heat recovery device is used to transfer the heat of the gas in the return air duct to the gas in the fresh air duct to complete the heat exchange.

Referring to Figure 3, Figure 3 is a structural schematic diagram three of a deep heat recovery fresh air system provided by an embodiment of the present application. As shown in Figure 3, the deep heat recovery fresh air system provided by this embodiment includes: heat recovery device 10, water tray 11, air exhaust outlet 20, fresh air outlet 30, fresh air preheating electric heating 31, fresh air bypass ventilation valve 32, Fresh air bypass duct 33, return air outlet 40, circulation air outlet 50, circulation fan 60, high efficiency filter 70, air supply outlet 80, reheat device 81, exhaust fan 90.

In order to better understand the embodiment of the present application, in Figure 3, use Indicates the flow path of indoor air when it is discharged outdoors, using Indicates the flow path of outdoor air when it is sent indoors; use Indicates the flow path of outdoor air when it is sent indoors through the fresh air bypass duct.

When the fresh air system is working, the outdoor air enters the fresh air duct from the fresh air outlet 30, and then passes through the heat recovery device 10, and then enters the room from the air supply outlet 80; the indoor air enters the return air duct from the return air outlet 40, and then passes through the heat recovery device 10, from The air outlet 20 discharges the air to the outside.

In some embodiments, when the fresh air system is working, the indoor clean air can also enter the fresh air system through the circulating air outlet 50 and mix with the gas flowing into the fresh air system from the outside to form a mixed gas. After being processed, the mixed gas is sent through The air outlet 80 enters the room.

In some embodiments, the circulation fan 60 is used to guide the outdoor air passing through the heat recovery device 10 and the indoor clean air entering from the circulation vent 50 to the air supply vent 80 . The high-efficiency filter 70 is used to filter the gas sent into the room, so that the gas passing through the air supply port 80 is free of particulate matter and odor.

In some embodiments, when the heat recovery device 10 is installed, its exhaust outlet should be at the lowest position of the above-mentioned deep heat recovery fresh air system, and its exhaust outlet should have a certain inclination angle downward.

Referring to Figure 4, Figure 4 is a schematic structural diagram 4 of a deep heat recovery fresh air system provided by an embodiment of the present application. As shown in Figure 4, the deep heat recovery fresh air system provided by this embodiment includes:

Fresh air measurement outlet 401, fresh air outlet 402, fresh air valve 403, fresh air filter 404, electric heating 405, second bypass ventilation valve 406, exhaust outlet 407, exhaust valve 408, exhaust air measurement outlet 409, water tray 410, Exhaust fan 411, heat recovery device 412, high efficiency filter 413, heat exchanger water tray 414, circulation fan 415, heat exchange coil 416, air reprocessing device 417, clean air supply port 418, control box 419, circulation Wind measurement air outlet 420, clean air return air outlet 421, clean air return air valve 422, clean air filter 423, first bypass ventilation valve 424, dirty air air inlet 425, fresh air bypass channel 426, dirty air inlet damper 427, Dirty air filter 428, fresh air bypass valve 429.

In some embodiments, the dirty air inlet 425 is used to introduce dirty air from the indoor dirty space; the dirty air inlet damper 427 is used to close or adjust the flow of dirty air entering from the indoor dirty space; the dirty air filter 428 is used to The dirty air is filtered to form first filtered air.

The exhaust fan 411 is used to guide the first heat transfer air formed after the first filtered air passes through the heat recovery device 412 to the exhaust port 407 .

The exhaust valve 408 is used to close the exhaust air duct from indoor to outdoor.

The air outlet 407 is used to discharge the first heat transfer air to the outdoors.

The fresh air outlet 402 is used to introduce fresh air from the outdoors; the fresh air valve 403 is used to close the passage of outdoor air into the room or adjust the flow of fresh air entering the room; the fresh air filter 404 is used to filter the fresh air to form The second filtered air; the clean air return port 421 is used to introduce clean air from the indoor clean space; the clean air return valve 422 is used to close the indoor clean air channel or adjust the indoor clean air flow; the clean air filter 423 It is used to filter the clean air to form the third filtered air; the circulation fan 415 is used to combine the second heat transfer air formed after the second filtered air passes through the heat recovery device 412 with the third filtered air. The circulating clean air formed after the air mixing process is sent to the clean air supply port 418; the high-efficiency filter 413 is used to filter the air after the second filtered air and the third filtered air are mixed to form a fourth filtered air. ; The air reprocessing device 417 is used to reprocess the fourth filtered air; the clean air supply port 418 is used to send the circulating clean air to the indoor space.

In some embodiments, the de-icing subsystem is used to: turn on the clean air when an icing layer exists inside the exhaust side of the heat recovery device 412 and the thickness of the existing icing layer is greater than or equal to the preset thickness threshold. Return air valve 422, first bypass vent valve 424, exhaust fan 411, second bypass vent valve 406, fresh air valve 403, circulation fan 415; close the dirty air inlet damper 427, exhaust valve 408, and fresh air valve 403.

Referring to Figure 5, Figure 5 is a schematic flowchart 1 of an antifreeze control method applied to a deep heat recovery fresh air system provided by an embodiment of the present application. In a feasible implementation, the above method includes:

S501. The fresh air system starts.

S502. Control the operation of the fresh air system according to the control parameters currently set by the user.

S503. Detect whether the outdoor ambient temperature is lower than the preset temperature threshold. If yes, continue to execute S504. If not, continue to control the operation of the fresh air system according to the control parameters currently set by the user.

Among them, when controlling the operation of the fresh air system according to the control parameters currently set by the user, it is not necessary to detect whether there is an icing layer inside the exhaust side of the heat recovery device.

S504. Detect whether there is an ice layer with a thickness greater than or equal to a preset thickness threshold inside the exhaust side of the heat recovery device. If not, no processing is performed, and the operation of the fresh air system is still controlled according to the control parameters currently set by the user. If yes, continue to execute S505.

In the embodiment of this application, when the outdoor ambient temperature is lower than the preset temperature threshold (such as -5°C or 0°C), after the fresh air system is started, the fresh air system first operates normally according to the control parameters currently set by the user, that is, the exhaust air Both the ducts and fresh air ducts operate at normal air volume.

Among them, during the operation of the fresh air system, it is detected in real time whether there is an ice layer inside the exhaust side of the heat recovery device.

If there is no icing layer inside the exhaust side of the heat recovery device, or the thickness of the icing layer inside the exhaust side of the heat recovery device is less than the preset thickness threshold, no processing will be performed, and the control currently set by the user will still be followed. Parameters control the operation of the fresh air system.

It can be understood that when the thickness of the icing layer inside the exhaust side of the heat recovery device is less than the preset thickness threshold, the impact on the heat recovery efficiency of the heat recovery device is small and can be ignored. The user's current settings are still used. The control parameters control the operation of the fresh air system.

If there is an icing layer inside the exhaust side of the heat recovery device, and the thickness of the existing icing layer is greater than or equal to the preset thickness threshold, continue to execute S505.

S505. Execute the preset de-icing operation, and return to S504 after the preset time period.

In the embodiment of the present application, when there is an icing layer inside the exhaust side of the heat recovery device, and the thickness of the existing icing layer is greater than or equal to the preset thickness threshold, the icing layer inside the exhaust side of the heat recovery device It will have a certain impact on the heat recovery efficiency of the heat recovery device and reduce the heat exchange efficiency of the heat recovery device. In this case, by performing a preset de-icing operation to remove the ice layer inside the exhaust side of the heat recovery device, the heat recovery device can make full use of the heat of the gas inside the return air duct and cool down the inside of the fresh air duct. The air is preheated.

In addition, after performing the preset de-icing operation for the preset time, re-detect whether there is an icing layer inside the exhaust side of the heat recovery device. If there is no icing layer inside the exhaust side of the heat recovery device, or the heat recovery device If the thickness of the ice layer existing inside the exhaust side of the device is less than the preset thickness threshold, the de-icing operation will be canceled and the control parameters currently set by the user will be restored to control the operation of the fresh air system. If there is an icing layer inside the exhaust side of the heat recovery device, and the thickness of the existing icing layer is greater than or equal to the preset thickness threshold, the preset de-icing operation is performed.

The antifreeze control method applied to the deep heat recovery fresh air system provided by the embodiment of this application, when the outdoor temperature is low, when the fresh air system first starts to work, first controls the operation of the fresh air system according to the control parameters currently set by the user, and at the same time Detect whether there is an icing layer inside the exhaust side of the heat recovery device; when there is an icing layer inside the exhaust side of the heat recovery device, and the thickness of the existing icing layer is greater than or equal to the preset thickness threshold, a de-icing operation is performed , and still controls the operation of the fresh air system according to the control parameters currently set by the user after deicing, which can not only fully recover the heat of the gas in the return air duct, improve the heat exchange efficiency of the fresh air system, but also reduce the energy consumption of the fresh air system.

Based on the contents of the above embodiments, in some embodiments, the above-mentioned deep heat recovery fresh air system also includes an ice detection subsystem, and the ice detection subsystem includes at least one pressure difference sensor.

Optionally, the above-mentioned at least one pressure difference sensor may be disposed in the above-mentioned exhaust duct.

The methods for detecting whether there is an icing layer inside the exhaust side of the heat recovery device in S501 above include:

Use at least one of the pressure difference sensors mentioned above to detect the wind resistance inside the exhaust duct; when the wind resistance inside the exhaust duct is less than the preset wind resistance threshold, it is determined that there is no icing layer inside the exhaust side of the heat recovery device, or that there is an icing layer The thickness is less than the preset thickness threshold; when the wind resistance inside the exhaust duct is greater than or equal to the above preset wind resistance threshold, it is determined There is an icing layer inside the exhaust side of the heat recovery device, and the thickness of the existing icing layer is greater than or equal to the above-mentioned preset thickness threshold.

It can be understood that the thicker the ice layer inside the exhaust side of the heat recovery device, the greater the wind resistance the exhaust duct will encounter when discharging indoor air.

Optionally, the above-mentioned differential pressure sensor can be an air pressure sensor.

In a feasible implementation, the air pressure change of the gas inside the exhaust duct can be detected by an air pressure sensor to determine the wind resistance inside the exhaust duct.

In order to better understand the embodiment of the present application, refer to Figure 6 , which is a schematic flow chart 2 of an antifreeze control method applied to a deep heat recovery fresh air system provided by the embodiment of the present application. In a feasible implementation, The above antifreeze control methods applied to deep heat recovery fresh air systems include:

S601. The fresh air system starts.

S602. Control the operation of the fresh air system according to the control parameters currently set by the user.

S603. Detect whether the outdoor ambient temperature is lower than the preset temperature threshold. If so, continue to execute S604. If not, continue to control the operation of the fresh air system according to the control parameters currently set by the user.

S604. Detect whether the wind resistance inside the exhaust duct is greater than the preset wind resistance threshold. If not, no processing is performed, and the operation of the fresh air system is still controlled according to the control parameters currently set by the user. If yes, continue to execute S605.

S605. Execute the preset de-icing operation, and return to S604 after the preset time period.

In some embodiments, the above-mentioned ice detection subsystem may further include at least three temperature sensors. At least a first temperature sensor, a second temperature sensor and a third temperature sensor.

Optionally, the at least one first temperature sensor may be disposed in the return air duct, the at least one second temperature sensor may be disposed in the fresh air duct, and the at least one third temperature sensor may be disposed in the exhaust duct.

The above-mentioned methods of detecting whether there is an ice layer inside the exhaust side of the heat recovery device include:

Using the detection data of the at least one first temperature sensor, at least one second temperature sensor and the at least third temperature sensor, calculate the heat exchange efficiency of the heat recovery device; when the heat exchange efficiency of the heat recovery device is greater than the preset efficiency threshold , determine that there is no icing layer inside the exhaust side of the heat recovery device, or the thickness of the existing icing layer is less than the preset thickness threshold; when the heat exchange efficiency of the heat recovery device is less than or equal to the preset efficiency threshold, determine the heat recovery There is an icing layer inside the exhaust side of the device, and the thickness of the existing icing layer is greater than or equal to the preset thickness threshold.

It can be understood that the greater the thickness of the ice layer inside the exhaust side of the heat recovery device, the less likely it is for the heat inside the return air duct to be transferred to the gas in the fresh air duct, and the lower the heat exchange efficiency of the heat recovery device will be. .

Optionally, a temperature sensor can be installed at the air inlet and outlet of the fresh air duct to detect the temperature difference of the gas in the fresh air duct after passing through the heat recovery device. A temperature sensor is provided inside the exhaust duct for detecting the temperature of the gas discharged from the exhaust duct.

In a feasible implementation, the temperature of the gas discharged from inside the exhaust duct and the above-mentioned temperature difference can be used to determine the heat exchange efficiency of the heat recovery device.

Among them, the greater the above-mentioned temperature difference, the higher the heat exchange efficiency of the heat recovery device.

In order to better understand the embodiment of the present application, refer to Figure 7 , which is a schematic flowchart 3 of an antifreeze control method applied to a deep heat recovery fresh air system provided by the embodiment of the present application. In a feasible implementation, The above methods to improve the heat exchange efficiency of the fresh air system include:

S701. The fresh air system starts.

S702. Control the operation of the fresh air system according to the control parameters currently set by the user.

S703. Detect whether the outdoor ambient temperature is lower than the preset temperature threshold. If so, continue to execute S704. If not, continue to control the operation of the fresh air system according to the control parameters currently set by the user.

S704. Detect whether the heat exchange efficiency of the heat recovery device is less than or equal to the preset efficiency threshold. If not, no processing is performed, and the operation of the fresh air system is still controlled according to the control parameters currently set by the user. If yes, continue to execute S705.

In other embodiments, it can also be detected whether the heat exchange efficiency of the heat recovery device decreases compared with the heat recovery efficiency in the initial ice-free state is greater than or equal to the preset threshold; if not, no processing is performed, and the user's current The set control parameters control the operation of the fresh air system. If yes, continue to execute S705.

S705. Execute the preset de-icing operation, and return to S704 after the preset time period.

Based on the content in the above embodiments, in some embodiments of the present application, the above deicing operation may be:

The gas flow rate of the above-mentioned indoor clean air treatment subsystem and indoor dirty air treatment subsystem is reduced according to the preset reduction range.

Optionally, the gas flow in the fresh air duct and the exhaust duct can be reduced simultaneously according to the preset reduction range.

Among them, after reducing the gas flow in the fresh air duct and the exhaust duct, the heat of the gas in the return air duct is used to dissolve the ice layer existing inside the exhaust side of the heat recovery device.

In other embodiments of this application, the above-mentioned deep heat recovery fresh air system also includes a de-icing subsystem, and the de-icing sub-system includes a fresh air preheating device; the above-described de-icing operation may also include:

The above-mentioned fresh air preheating device is controlled to heat the fresh air introduced from the outdoors by the indoor clean air treatment subsystem.

Optionally, the above-mentioned fresh air preheating device can be controlled to heat the gas entering the fresh air duct.

It can be understood that after the gas in the fresh air duct is preheated, both the gas in the return air duct and the gas in the fresh air duct can accelerate the dissolution of the ice layer existing inside the exhaust side of the heat recovery device.

Optionally, the above-mentioned fresh air preheating device may be an electric heating device or a preheating coil.

In some embodiments of the present application, the above-mentioned deicing subsystem also includes a fresh air bypass component; the above-mentioned deicing operation may also include:

The above-mentioned fresh air bypass component is used to allow the heated fresh air to be sent into the indoor clean space without passing through the above-mentioned heat recovery device.

Among them, the heated gas in the fresh air duct is sent into the room without passing through the heat recovery device. This operation can reduce the heating amount of the gas entering the fresh air duct and increase the deicing speed.

In some embodiments of the present application, the above-mentioned deicing subsystem also includes a reheating device for heating the gas sent into the indoor clean space; the above-mentioned deicing operation also includes:

According to the temperature and set value of the fresh air introduced from the outside by the indoor clean air treatment subsystem, the heating power of the above-mentioned reheating device is adjusted so that the temperature of the gas sent to the indoor clean space is within the preset temperature range.

For example, when preheating the gas in the fresh air duct, the temperature of the gas sent into the room by the fresh air duct can also be detected in real time; and then the heating power of the reheating device is adjusted according to the temperature of the gas sent into the room by the fresh air duct. So that the temperature of the gas sent into the room by the fresh air duct is within the preset temperature range.

For example, during the electric heating process, the temperature of the gas sent into the room by the fresh air duct can be detected in real time, and the power of the reheating device can be adjusted based on the temperature feedback so that the temperature of the gas sent into the room by the fresh air duct can be maintained at the preset temperature ( Such as 16.5℃).

For another example, assume that the outdoor temperature is -20°, and the temperature of the gas in the fresh air duct after passing through the heat recovery device cannot reach the required temperature (such as 16.5°C). If it can actually only reach 10°C, there is a temperature difference of 6.5°C. , then the above electric heating process can be used to compensate for this temperature difference to ensure that the output fresh air reaches the required temperature.

In some embodiments of this application, it also includes:

Detect the temperature of the gas entering the air supply duct in real time; adjust the heating power of the reheating device according to the temperature and set value of the gas entering the air supply duct, so that the temperature of the gas sent into the room by the air supply duct is at the preset value. within the specified temperature range.

In a feasible implementation of the present application, after adjusting the heating power of the above-mentioned reheating device to the maximum power of the electric heating component, if the temperature of the gas entering the air supply duct is not within the preset temperature range, then according to The preset reduction amplitude reduces the gas flow in the fresh air duct and the exhaust duct, so that the temperature of the gas sent into the room by the air supply duct reaches the preset temperature range.

In order to better understand the embodiment of the present application, refer to Figure 8 , which is a schematic flow chart 4 of an antifreeze control method applied to a deep heat recovery fresh air system provided by the embodiment of the present application. In a feasible implementation, The above antifreeze control methods applied to deep heat recovery fresh air systems include:

S801. The fresh air system starts.

S802. Control the operation of the fresh air system according to the control parameters currently set by the user.

S803. Detect whether the outdoor ambient temperature is lower than the preset temperature threshold. If so, continue to execute S804. If not, continue to control the operation of the fresh air system according to the control parameters currently set by the user.

S804. Detect whether there is an ice layer inside the exhaust duct. If not, no processing is performed, and the operation of the fresh air system is still controlled according to the control parameters currently set by the user. If yes, continue to execute S805.

S805. Reduce the gas flow in the fresh air duct and exhaust duct.

S806. Use the fresh air preheating device to heat the gas in the fresh air duct.

S807. Use the fresh air bypass component to allow the heated gas in the fresh air duct to be sent indoors without passing through the heat recovery device.

S808. Determine whether the temperature of the gas sent into the room by the fresh air duct is within a preset temperature range. If yes, execute S8011; if not, execute S809.

S809. Start the reheating device to heat the gas sent into the room from the air supply duct, and determine whether the heating power of the reheating device has reached the maximum power. If not, execute S8010; if yes, return to execute S805.

S8010: Adjust the heating power of the reheating device, and return to execution S808.

S8011. Determine whether the de-icing end condition is met. If so, exit de-icing; if not, return to S808.

In some embodiments of the present application, indoor air can also be used to heat the heat recovery device for de-icing. For example, the indoor clean air treatment subsystem is controlled so that the clean air in the indoor clean space flows through the heat recovery device and then re-entered into the indoor clean space. This way, the heat of the indoor air can be used to heat the heat recovery device for de-icing.

In order to better understand the embodiment of the present application, refer to Figure 9 , which is a schematic flow chart 5 of an antifreeze control method applied to a deep heat recovery fresh air system provided by the embodiment of the present application. In a feasible implementation, The above antifreeze control methods applied to deep heat recovery fresh air systems include:

S901. The fresh air system starts.

S902. Control the operation of the fresh air system according to the control parameters currently set by the user.

S903. Detect whether the outdoor ambient temperature is lower than the preset temperature threshold. If so, continue to execute S904. If not, continue to control the operation of the fresh air system according to the control parameters currently set by the user.

S904. Detect whether there is an ice layer with a thickness greater than or equal to a preset thickness threshold inside the exhaust side of the heat recovery device. If not, no processing is performed, and the operation of the fresh air system is still controlled according to the control parameters currently set by the user. If yes, continue to execute S905.

In the embodiment of the present application, during the operation of the fresh air system, whether there is an icing layer inside the exhaust side of the heat recovery device is detected in real time. If there is no icing layer inside the exhaust side of the heat recovery device, or the thickness of the icing layer inside the exhaust side of the heat recovery device is less than the preset thickness threshold, no processing will be performed, and the control currently set by the user will still be followed. Parameters control the operation of the fresh air system. If there is an icing layer inside the exhaust side of the heat recovery device, and the thickness of the existing icing layer is greater than or equal to the preset thickness threshold, continue to execute S905.

S905. Control the indoor clean air treatment subsystem so that the clean air in the indoor clean space flows through the heat recovery device for de-icing and then is sent into the indoor space.

In the embodiment of the present application, when there is an icing layer inside the exhaust side of the heat recovery device, and the thickness of the existing icing layer is greater than or equal to the preset thickness threshold, the icing layer inside the exhaust side of the heat recovery device It will have a certain impact on the heat recovery efficiency of the heat recovery device and reduce the heat exchange efficiency of the heat recovery device. In this case, by using indoor air to heat the heat recovery device, the ice layer inside the exhaust side of the heat recovery device can be removed, allowing the heat recovery device to fully utilize the heat of the gas inside the return air duct.

Based on the description in the above embodiments, embodiments of the present application also provide a deep heat recovery fresh air system. In some embodiments, the above-mentioned deep heat recovery fresh air system includes an indoor return air subsystem, an indoor return air treatment subsystem, a fresh air treatment subsystem, an icing detection subsystem, and a deicing subsystem, and the fresh air treatment subsystem is related to the The above-mentioned indoor return air treatment subsystems all include heat recovery devices. in:

The indoor return air subsystem is used to distinguish indoor dirty air and indoor clean air in the indoor return air area.

The indoor return air treatment subsystem is used to discharge the first heat transfer air formed after indoor return air treatment to the outdoors.

The fresh air treatment subsystem is used to process outdoor fresh air to form second filtered air and send it to the indoor space.

The heat recovery device is used to transfer heat between the first filtered air and the second filtered air.

The ice detection subsystem is used to detect whether there is an ice layer inside the exhaust side of the heat recovery device when the outdoor ambient temperature is lower than a preset temperature threshold.

In some embodiments, the indoor return air subsystem includes an indoor dirty air subsystem and an indoor clean air subsystem; the indoor dirty air subsystem at least includes a dirty air ventilation duct and a dirty air damper; the indoor clean air subsystem The subsystem includes at least clean air ventilation ducts and clean air dampers.

In some embodiments, the indoor return air treatment subsystem includes an exhaust fan and an exhaust damper; the fresh air treatment subsystem includes a fresh air valve, a fresh air bypass ventilation valve, and an air supply fan. The de-icing subsystem also includes a defrost secondary bypass vent valve.

Referring to Figure 10, Figure 10 is a schematic structural diagram 5 of a deep heat recovery fresh air system provided by an embodiment of the present application. As shown in FIG. 10 , the indoor dirty air subsystem at least includes a dirty air ventilation duct 121 and a dirty air damper 122 ; the indoor clean air subsystem at least includes a clean air ventilation duct 124 and a clean air damper 123 .

The above-mentioned indoor return air treatment subsystem includes: return air outlet 117, return air damper 116, return air filter 118, heat recovery device 110, exhaust fan 111, exhaust air valve 108, and exhaust outlet 107; the above-mentioned fresh air treatment subsystem The system includes: fresh air outlet 102, fresh air valve 103, fresh air air filter 104, fresh air bypass valve 120, heat recovery device 110, air supply fan 112, and air supply outlet 114. The above-described de-icing subsystem includes a defrost second bypass vent valve 106 .

The above-mentioned deep heat recovery fresh air system also includes a fresh air measuring outlet 101, an electric heating 105, an exhaust air measuring outlet 109, a first fresh air filter 113, a control box 115, and a fresh air bypass channel 119.

In some embodiments, when the fresh air system is operating normally, the following components are in the open state: exhaust damper 108, fresh air valve 103, exhaust fan 111, air supply fan 112, and dirty air damper 122; the following components are in the closed state: defrost The second bypass vent valve 106, the fresh air bypass vent valve 120, and the clean air damper 123.

When the fresh air system performs deicing operation, the following components are open: clean air damper 123, exhaust fan 111, defrost second bypass ventilation valve 106, and air supply fan 112; the following components are closed: dirty air damper 122, exhaust fan 112 Air damper 108, fresh air valve 103, fresh air bypass ventilation valve 120.

In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of modules is only a logical function division. In actual implementation, there may be other division methods, for example, multiple modules may be combined or integrated. to another system, or some features can be ignored, or not implemented. On the other hand, the coupling or direct coupling or communication connection between each other shown or discussed may be through some interfaces, indirect coupling or communication connection of devices or modules, and may be in electrical, mechanical or other forms.

The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical units, that is, they may be located in one place, or they may be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

Persons of ordinary skill in the art can understand that all or part of the steps to implement the above method embodiments can be completed by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the steps including the above-mentioned method embodiments are executed; and the aforementioned storage media include: ROM, RAM, magnetic disks, optical disks and other media that can store program codes.

The following clauses relate to non-limiting embodiments according to another aspect of the application:

Clause 1: An antifreeze control method applied to a deep heat recovery fresh air system, wherein the deep heat recovery fresh air system includes a fresh air duct, a supply air duct, a return air duct, an exhaust duct and a heat recovery device; the return air The ducts and exhaust ducts are used to discharge indoor air to the outdoors. The fresh air ducts and air supply ducts are used to send outdoor air into the room. The heat recovery device is used to transfer the heat of the gas in the return air duct. To the gas in the fresh air duct;

The antifreeze control method includes:

Clause 2: According to the method described in the preceding clause, at least one pressure difference sensor is provided in the exhaust duct;

Using the at least one differential pressure sensor to detect wind resistance inside the exhaust duct;

When the wind resistance inside the exhaust duct is less than the preset wind resistance threshold, it is determined that there is no icing layer inside the exhaust side of the heat recovery device, or the thickness of the existing icing layer is less than the preset thickness threshold;

When the wind resistance inside the exhaust duct is greater than or equal to the preset wind resistance threshold, it is determined that there is an icing layer inside the exhaust side of the heat recovery device, and the thickness of the existing icing layer is greater than or equal to the preset Set the thickness threshold.

Clause 3: According to the method according to any one of the preceding clauses, at least one first temperature sensor is arranged in the return air duct, at least one second temperature sensor is arranged in the fresh air duct, and at least one second temperature sensor is arranged in the exhaust duct. Provided with at least one third temperature sensor;

Calculate the heat exchange efficiency of the heat recovery device using detection data of the at least one first temperature sensor, the at least one second temperature sensor and the at least third temperature sensor;

When the heat exchange efficiency of the heat recovery device is greater than the preset efficiency threshold, or when the heat exchange efficiency of the heat recovery device decreases from the heat recovery efficiency in the initial ice-free state by less than the preset threshold, it is determined that the There is no icing layer inside the exhaust side of the heat recovery device, or the thickness of the existing icing layer is less than the preset thickness threshold;

When the heat exchange efficiency of the heat recovery device is less than or equal to the preset efficiency threshold, or when the heat exchange efficiency of the heat recovery device decreases from the heat recovery efficiency in the initial ice-free state by a value greater than or equal to the preset When setting a threshold, it is determined that there is an icing layer inside the exhaust side of the heat recovery device, and the thickness of the icing layer is greater than or equal to the preset thickness threshold.

Clause 4: According to the method described in any of the preceding clauses, the execution of the preset de-icing operation includes:

The gas flow rate in the fresh air duct and the exhaust air duct is reduced according to a preset reduction amplitude.

Clause 5: According to the method described in any one of the preceding clauses, the deep heat recovery fresh air system also includes a fresh air preheating device; the execution of the preset de-icing operation includes:

The fresh air preheating device is controlled to heat the gas entering the fresh air duct.

Clause 6: According to the method described in any one of the preceding clauses, the fresh air preheating device is an electric heating device or a preheating coil.

Clause 7: According to the method described in any one of the preceding clauses, the deep heat recovery fresh air system also includes a fresh air bypass component; the execution of the preset de-icing operation includes:

By utilizing the fresh air bypass assembly, the heated gas in the fresh air duct is sent into the room without passing through the heat recovery device.

Clause 8: According to the method described in any one of the preceding clauses, the deep heat recovery fresh air system further includes a reheat device; the execution of the preset de-icing operation includes:

Detect the temperature of the gas entering the air supply duct in real time;

According to the temperature and set value of the gas entering the air supply duct, the heating power of the reheating device is adjusted so that the temperature of the gas sent into the room by the air supply duct is within a preset temperature range.

Clause 9: According to the method according to any one of the preceding clauses, adjusting the heating power of the reheating device according to the temperature and set value of the gas entering the air supply duct includes:

When the heating power of the reheating device is adjusted to the maximum power, if the temperature of the gas entering the air supply duct is not within the preset temperature range, the fresh air will be reduced according to the preset reduction range. The gas flow in the duct and the exhaust duct.

Clause 10: The method according to any one of the preceding clauses, wherein the reheating device is an electric heating device or a reheating coil.

Clause 11: According to the method described in any one of the preceding clauses, the deep heat recovery fresh air system also includes a water receiving tray located below the exhaust outlet of the heat recovery device for collecting The de-iced water is discharged to the indoor pipe network.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features can be equivalently replaced; and these modifications or substitutions do not deviate from the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present application. scope.

Claims

An antifreeze control method applied to a deep heat recovery fresh air system, characterized in that the deep heat recovery fresh air system includes an indoor dirty air treatment subsystem and an indoor clean air treatment subsystem, and the indoor clean air treatment subsystem is connected to the indoor clean air treatment subsystem. The indoor dirty air treatment subsystem all includes a heat recovery device; the indoor dirty air treatment subsystem is used to discharge the first heat transfer air formed after treating the dirty air in the indoor dirty space to the outside; the indoor clean air treatment subsystem The system is used to send the circulating clean air formed by mixing and processing the clean air in the indoor clean space and the fresh outdoor air to the indoor space; the heat recovery device is used to transfer the first air generated by the indoor dirty air treatment subsystem to the indoor space. The filtered air conducts heat transfer with the second filtered air formed after filtering the fresh air entering from the outside in the indoor clean air treatment subsystem;

The antifreeze control method includes:

When the outdoor ambient temperature is lower than the preset temperature threshold, detect whether there is an ice layer inside the exhaust side of the heat recovery device;

If there is no icing layer inside the exhaust side of the heat recovery device, or the thickness of the existing icing layer is less than the preset thickness threshold, the operation of the deep heat recovery fresh air system is controlled according to the control parameters currently set by the user;

If there is an icing layer inside the exhaust side of the heat recovery device, and the thickness of the existing icing layer is greater than or equal to the preset thickness threshold, a preset de-icing operation is performed, and during the de-icing operation After completion, return to detect whether there is an ice layer inside the exhaust side of the heat recovery device.
The method according to claim 1, characterized in that the deep heat recovery fresh air system further includes an icing detection subsystem, and the icing detection subsystem includes at least one pressure difference sensor;

The detection of whether there is an icing layer inside the exhaust side of the heat recovery device includes:

Utilize the at least one differential pressure sensor to detect the wind resistance of the first heat transfer air discharged from the indoor dirty air treatment subsystem when it flows through the heat recovery device;

When the wind resistance is less than the preset wind resistance threshold, it is determined that there is no icing layer inside the exhaust side of the heat recovery device, or the thickness of the existing icing layer is less than the preset thickness threshold;

When the wind resistance is greater than or equal to the preset wind resistance threshold, it is determined that an icing layer exists inside the exhaust side of the heat recovery device, and the thickness of the existing icing layer is greater than or equal to the preset thickness threshold.
The method according to claim 1, wherein the deep heat recovery fresh air system further includes an icing detection subsystem, and the icing detection subsystem includes a plurality of temperature sensors;

The detection of whether there is an icing layer inside the exhaust side of the heat recovery device includes:

Utilize the plurality of temperature sensors to detect the heat exchange efficiency of the heat recovery device;

When the heat exchange efficiency of the heat recovery device is greater than the preset efficiency threshold, or when the heat exchange efficiency of the heat recovery device decreases compared to the heat exchange efficiency of the initial ice-free state is less than the preset threshold, it is determined that the There is no icing layer inside the exhaust side of the heat recovery device, or the thickness of the existing icing layer is less than the preset thickness threshold;

When the heat exchange efficiency of the heat recovery device is less than or equal to the preset efficiency threshold, or when the heat exchange efficiency of the heat recovery device decreases compared to the heat exchange efficiency in the initial ice-free state is greater than or equal to the When the threshold is preset, it is determined that there is an icing layer inside the exhaust side of the heat recovery device, and the thickness of the icing layer is greater than or equal to the preset thickness threshold.
The method according to any one of claims 1-3, characterized in that performing a preset de-icing operation includes:

The flow rate of fresh air in the indoor clean air treatment subsystem and the gas flow rate in the indoor dirty air treatment subsystem are reduced according to a preset reduction amplitude.
The method according to any one of claims 1 to 4, characterized in that the deep heat recovery fresh air system also includes a deicing subsystem, the deicing subsystem includes a fresh air preheating device; the execution preset De-icing operations include:

The fresh air preheating device is controlled to heat the fresh air introduced from the outdoors by the indoor clean air treatment subsystem.
The method according to claim 5, characterized in that the fresh air preheating device is an electric heating device or a preheating coil.
The method according to claim 5 or 6, characterized in that the deicing subsystem further includes a fresh air bypass component; and performing a preset deicing operation includes:

The fresh air bypass assembly is used to allow the heated fresh air to be sent into the indoor space without passing through the heat recovery device.
The method according to any one of claims 5 to 7, characterized in that the deicing subsystem further includes a reheating device for heating the gas sent into the indoor space; De-icing operations include:

According to the temperature and set value of the fresh air introduced from the outside by the indoor clean air treatment subsystem, the heating power of the reheating device is adjusted so that the temperature of the gas sent to the indoor space is within the preset temperature range. Inside.
The method according to claim 8, characterized in that adjusting the heating power of the reheating device according to the temperature and set value of the fresh air introduced from the outdoors by the indoor clean air treatment subsystem includes:

When the heating power of the reheating device is adjusted to the maximum power, if the temperature of the gas sent into the indoor space is not within the preset temperature range, the indoor space is reduced according to the preset reduction range. The flow rate of fresh air in the clean air treatment subsystem and the gas flow rate in the indoor dirty air treatment subsystem.
The method according to claim 8 or 9, characterized in that the reheating device is an electric heating device or a reheating coil.
The method according to any one of claims 1-10, characterized in that performing a preset de-icing operation further includes:

The indoor clean air treatment subsystem is controlled so that the clean air in the indoor clean space flows through the heat recovery device for de-icing and then is sent into the indoor space.
The method according to any one of claims 1 to 11, characterized in that the deep heat recovery fresh air system further includes a water receiving tray located below the exhaust outlet of the heat recovery device. , used to collect de-iced water and discharge it to the indoor pipe network.
A deep heat recovery fresh air system, characterized in that the deep heat recovery fresh air system includes an indoor dirty air treatment subsystem, an indoor clean air treatment subsystem, an icing detection subsystem and a deicing subsystem, and the indoor clean air Both the treatment subsystem and the indoor dirty air treatment subsystem include a heat recovery device;

The indoor dirty air treatment subsystem is used to discharge the first heat transfer air formed after treating the dirty air in the indoor dirty space to the outdoors;

The indoor clean air treatment subsystem is used to deliver the circulating clean air formed by mixing and processing the clean air in the indoor clean space and the fresh outdoor air to the indoor space;

The heat recovery device is used to combine the first filtered air formed after processing by the indoor dirty air treatment subsystem with In the indoor clean air treatment subsystem, the fresh air entering from the outside is filtered and processed to form a second filtered air for heat transfer;

The ice detection subsystem is used to detect whether there is an ice layer inside the exhaust side of the heat recovery device when the outdoor ambient temperature is lower than a preset temperature threshold;

The de-icing subsystem is used to control the de-icing subsystem according to the control parameters currently set by the user if there is no icing layer inside the exhaust side of the heat recovery device, or the thickness of the existing icing layer is less than the preset thickness threshold. The deep heat recovery fresh air system is running; if there is an icing layer inside the exhaust side of the heat recovery device, and the thickness of the existing icing layer is greater than or equal to the preset thickness threshold, a preset de-icing operation is performed.
The deep heat recovery fresh air system according to claim 13, wherein the ice detection subsystem includes at least one pressure difference sensor for detecting the discharge of the first heat transfer air from the indoor dirty air treatment subsystem. Wind resistance when flowing through the heat recovery device;

When the wind resistance is less than the preset wind resistance threshold, it is determined that there is no icing layer inside the exhaust side of the heat recovery device, or the thickness of the existing icing layer is less than the preset thickness threshold;

When the wind resistance is greater than or equal to the preset wind resistance threshold, it is determined that an icing layer exists inside the exhaust side of the heat recovery device, and the thickness of the existing icing layer is greater than or equal to the preset thickness threshold.
The deep heat recovery fresh air system according to claim 13, wherein the ice detection subsystem includes a plurality of temperature sensors for detecting the heat exchange efficiency of the heat recovery device;

When the heat exchange efficiency of the heat recovery device is greater than the preset efficiency threshold, or when the heat exchange efficiency of the heat recovery device decreases compared to the heat exchange efficiency of the initial ice-free state is less than the preset threshold, it is determined that the There is no icing layer inside the exhaust side of the heat recovery device, or the thickness of the existing icing layer is less than the preset thickness threshold;

When the heat exchange efficiency of the heat recovery device is less than or equal to the preset efficiency threshold, or when the heat exchange efficiency of the heat recovery device decreases compared to the heat exchange efficiency in the initial ice-free state is greater than or equal to the When the threshold is preset, it is determined that there is an icing layer inside the exhaust side of the heat recovery device, and the thickness of the icing layer is greater than or equal to the preset thickness threshold.
The deep heat recovery fresh air system according to any one of claims 13-15, characterized in that the deicing subsystem is used for:

When there is an icing layer inside the exhaust side of the heat recovery device, and the thickness of the existing icing layer is greater than or equal to the preset thickness threshold, the indoor clean air treatment element is reduced according to the preset reduction range. The flow rate of fresh air in the system and the gas flow rate in the indoor dirty air treatment subsystem.
The deep heat recovery fresh air system according to any one of claims 13 to 16, characterized in that the deicing subsystem also includes a fresh air preheating device for:

When there is an icing layer inside the exhaust side of the heat recovery device, and the thickness of the existing icing layer is greater than or equal to the preset thickness threshold, the fresh air preheating device is controlled to treat the indoor clean air. The system is heated by fresh air brought in from outside.
The deep heat recovery fresh air system according to claim 17, wherein the fresh air preheating device is an electric heating device or a preheating coil.
The deep heat recovery fresh air system according to any one of claims 13 to 18, characterized in that the deicing subsystem further includes a fresh air bypass component; the deicing subsystem is used for:

When there is an icing layer inside the exhaust side of the heat recovery device, and the thickness of the existing icing layer is greater than or equal to When the thickness threshold is preset, the fresh air bypass component is used to allow the heated fresh air to be sent into the indoor space without passing through the heat recovery device.
The deep heat recovery fresh air system according to any one of claims 13 to 19, characterized in that the deicing subsystem further includes a reheating device; the deicing subsystem is used for:

When there is an icing layer inside the exhaust side of the heat recovery device, and the thickness of the existing icing layer is greater than or equal to the preset thickness threshold, the fresh air introduced from the outdoors according to the indoor clean air treatment subsystem The temperature and set value are adjusted to adjust the heating power of the reheating device so that the temperature of the gas sent into the indoor space is within the preset temperature range.
The deep heat recovery fresh air system according to claim 20, characterized in that the deicing subsystem is also used for:

When the heating power of the reheating device is adjusted to the maximum power, if the temperature of the gas sent to the indoor space is not within the preset temperature range, the indoor clean air will be reduced according to the preset reduction range. The flow rate of fresh air in the treatment subsystem and the gas flow rate of the indoor dirty air treatment subsystem.
The deep heat recovery fresh air system according to claim 20 or 21, characterized in that the reheating device is an electric heating device or a reheating coil.
The deep heat recovery fresh air system according to any one of claims 13-22, characterized in that the deicing subsystem is also used for:

The indoor clean air treatment subsystem is controlled so that the clean air in the indoor clean space flows through the heat recovery device for de-icing and then is sent into the indoor space.
The deep heat recovery fresh air system according to any one of claims 13-23, characterized in that the indoor dirty air treatment subsystem includes: a dirty air inlet, a dirty air inlet damper, a dirty air filter, an exhaust Fan, exhaust valve and exhaust outlet;

The dirty air inlet is used to introduce dirty air from the indoor dirty space;

The dirty air inlet damper is used to close or adjust the flow of dirty air entering from the indoor dirty space;

The dirty air filter is used to filter the dirty air to form the first filtered air;

The exhaust fan is used to guide the first heat transfer air formed after the first filtered air passes through the heat recovery device to the exhaust port;

The exhaust valve is used to close the exhaust duct from indoor to outdoor;

The air outlet is used to discharge the first heat transfer air to the outdoors.
The deep heat recovery fresh air system according to claim 24, characterized in that the indoor clean air treatment subsystem includes: a fresh air outlet, a fresh air valve, a fresh air filter, a clean air return outlet, a clean air return valve, a clean air Filters, circulation fans, high-efficiency filters, air reprocessing devices, clean air supply outlets;

The new air outlet is used to introduce fresh air from the outside;

The fresh air valve is used to close the passage for outdoor air to enter the room or to adjust the flow rate of fresh air entering the room;

The fresh air filter is used to filter the fresh air to form the second filtered air;

The clean air return air outlet is used to introduce clean air from the indoor clean space;

The clean air return valve is used to close the indoor clean air channel or adjust the indoor clean air flow rate;

The clean air filter is used to filter the clean air to form third filtered air;

The circulation fan is used to send the second heat transfer air formed after the second filtered air passes through the heat recovery device and the circulating clean air formed after mixing the third filtered air to the clean air supply port. ;

The high-efficiency filter is used to filter the air mixed with the second filtered air and the third filtered air to form fourth filtered air;

The air reprocessing device is used to reprocess the fourth filtered air;

The clean air supply outlet is used to send the circulating clean air to the indoor space.
The deep heat recovery fresh air system according to claim 25, wherein the deicing subsystem further includes a first bypass ventilation valve and a second bypass ventilation valve; the deicing subsystem is used for:

When there is an icing layer inside the exhaust side of the heat recovery device, and the thickness of the existing icing layer is greater than or equal to the preset thickness threshold, the clean air return valve and the first bypass ventilation are opened. valve, the exhaust fan, the second bypass ventilation valve, the fresh air valve, and the circulation fan; close the dirty air inlet air valve, the exhaust valve, and the fresh air valve.
The deep heat recovery fresh air system according to any one of claims 13 to 26, characterized in that the deep heat recovery fresh air system further includes a water receiving tray located at the exhaust air outlet of the heat recovery device. Below the outlet position, it is used to collect de-iced water and discharge it to the indoor pipe network.
A deep heat recovery fresh air system, characterized in that the deep heat recovery fresh air system includes an indoor return air subsystem, an indoor return air treatment subsystem, a fresh air treatment subsystem, an icing detection subsystem and a deicing subsystem, so Both the fresh air treatment subsystem and the indoor return air treatment subsystem include a heat recovery device;

The indoor return air subsystem is used to distinguish indoor dirty air and indoor clean air in the indoor return air area;

The indoor return air treatment subsystem is used to discharge the first heat transfer air formed after indoor return air treatment to the outdoors;

The fresh air treatment subsystem is used to process outdoor fresh air to form second filtered air and send it to the indoor space;

The heat recovery device is used to transfer heat between the first filtered air formed after filtering the indoor dirty air and the second filtered air;

The ice detection subsystem is used to detect whether there is an ice layer inside the exhaust side of the heat recovery device when the outdoor ambient temperature is lower than a preset temperature threshold;

The de-icing subsystem is used to control the de-icing subsystem according to the control parameters currently set by the user if there is no icing layer inside the exhaust side of the heat recovery device, or the thickness of the existing icing layer is less than the preset thickness threshold. The deep heat recovery fresh air system is running; if there is an icing layer inside the exhaust side of the heat recovery device, and the thickness of the existing icing layer is greater than or equal to the preset thickness threshold, a preset de-icing operation is performed.
The deep heat recovery fresh air system according to claim 28, wherein the indoor return air subsystem includes an indoor dirty air subsystem and an indoor clean air subsystem;

The indoor dirty air subsystem at least includes a dirty air ventilation duct and a dirty air damper;

The indoor clean air subsystem at least includes a clean air ventilation duct and a clean air damper.
The deep heat recovery fresh air system according to claim 28 or 29, characterized in that the indoor return air treatment subsystem includes an exhaust fan and an exhaust damper;

The fresh air treatment subsystem includes a fresh air valve, a fresh air bypass ventilation valve, and an air supply fan.
The system of claim 30, wherein the de-icing subsystem further includes a second defrosting side. Ventilation valve; the de-icing subsystem is used to:

When there is an icing layer inside the exhaust side of the heat recovery device, and the thickness of the existing icing layer is greater than or equal to the preset thickness threshold, the clean air damper, the exhaust fan, and the Defrost the second bypass ventilation valve and the air blower; close the dirty air damper, the exhaust damper, the fresh air valve, and the fresh air bypass ventilation valve.