CN115435398B - Air conditioning unit and control method - Google Patents
Air conditioning unit and control method Download PDFInfo
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- CN115435398B CN115435398B CN202211030720.3A CN202211030720A CN115435398B CN 115435398 B CN115435398 B CN 115435398B CN 202211030720 A CN202211030720 A CN 202211030720A CN 115435398 B CN115435398 B CN 115435398B
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 85
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000011282 treatment Methods 0.000 claims abstract description 118
- 239000003507 refrigerant Substances 0.000 claims abstract description 62
- 230000001276 controlling effect Effects 0.000 claims abstract description 48
- 230000007613 environmental effect Effects 0.000 claims abstract description 31
- 230000001105 regulatory effect Effects 0.000 claims abstract description 28
- 238000010438 heat treatment Methods 0.000 claims description 59
- 238000003303 reheating Methods 0.000 abstract description 14
- 238000009833 condensation Methods 0.000 abstract description 9
- 230000005494 condensation Effects 0.000 abstract description 9
- 238000004781 supercooling Methods 0.000 abstract description 7
- 230000033228 biological regulation Effects 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract description 5
- 238000007791 dehumidification Methods 0.000 abstract description 4
- 230000005611 electricity Effects 0.000 abstract description 4
- 230000007246 mechanism Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 13
- 239000003921 oil Substances 0.000 description 11
- 239000007788 liquid Substances 0.000 description 10
- 238000005265 energy consumption Methods 0.000 description 7
- 238000001816 cooling Methods 0.000 description 4
- 239000010687 lubricating oil Substances 0.000 description 4
- 238000005057 refrigeration Methods 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 238000011269 treatment regimen Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013526 supercooled liquid Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
The invention relates to the technical field of air conditioner control, in particular to an air conditioner unit and a control method. The air conditioning unit comprises a main loop and a control module, wherein the main loop comprises a compressor, a four-way valve, an outdoor heat exchanger, a second indoor heat exchanger and a first indoor heat exchanger which are sequentially communicated into a loop, the first indoor heat exchanger is used for receiving first mixed air to perform heat exchange treatment, the second indoor heat exchanger is used for receiving second mixed air to perform heat exchange treatment and outputting air to the indoor, and the control module is used for regulating and controlling the refrigerant flow of the first indoor heat exchanger and the second indoor heat exchanger and the mode of heat exchange treatment according to environmental information. The invention realizes the execution and control of multiple working modes through one unit mechanism, sets a serial hierarchical heat exchange structure and multiple air mixing treatments, reasonably utilizes the air with different grade sources to carry out sectional mixing treatment, is more beneficial to reducing condensation temperature and improving supercooling degree, and overcomes the defect of high electricity consumption by adopting an electric reheating temperature regulation and hot gas parallel shunting reheating mode after dehumidification.
Description
Technical Field
The invention relates to the technical field of air conditioner control, in particular to an air conditioner unit and a control method.
Background
In the prior art, the air conditioning unit has single function, and a plurality of modes are expanded, so that additional functional sections or equipment are needed, and the problems of high energy consumption, resource waste, environmental pollution and the like of the unit are caused. Meanwhile, various working modes of the air conditioning unit have at least the following defects:
1. The constant temperature and humidity mode adopts a primary return air treatment electric reheating mode, the air quantity of the dehumidifying heat exchanger is constant even if a secondary return air mode is adopted, and the constant air quantity mode has the energy consumption problems of transitional refrigeration consumption and transitional reheating when the indoor heat and humidity load is influenced by internal and external factors constantly. In order to solve the problem of reheating energy consumption, the prior art adopts the condensation heat recovery of a parallel condenser to solve the problem, the refrigerant is distributed to indoor reheating by using a refrigerant three-way valve, a double expansion valve to replace the refrigerant three-way valve or the double four-way valve, an electromagnetic valve and the like, the parallel condenser is performed by using the high-temperature superheated steam, the opportunity of obtaining lower condensation temperature and larger supercooling degree by using an indoor high-grade low-temperature air source to realize cascade heat recovery is sacrificed, and meanwhile, the heat and humidity treatment air quantity in a constant temperature and humidity mode is not adaptively adjusted along with the change of the heat and humidity load degree, so that the energy consumption is further increased.
2. The temperature and humidity controllable air supply mode is adopted, the air supply moisture content and the temperature are adjustable, the prior art adopts a multi-system combined design, a cooling and dehumidifying system is arranged, a stepped temperature adjusting and dehumidifying system and an air cooling and water cooling condenser combined system are also arranged, a full-working-condition dehumidification unit is formed, working-condition blind areas exist in a multi-system arrangement and combination mode, and the moisture content and the air outlet temperature are difficult to continuously and independently adjust.
3. In a heating operation mode, the indoor side is designed with less air quantity and heat exchange area than the outdoor side, when the return air temperature is higher, the heating operation temperature is controlled to be about 26 ℃, and when the indoor needs to be further heated, the indoor is limited; when the fresh air temperature is too low in winter, the cleanliness of the clean room is required to be kept by constant air quantity, the supercooling condensation phenomenon can occur due to the excessive air quantity passing through the indoor condenser, and the fresh air electric preheating device is often required to improve the air inlet temperature so as to ensure the normal operation of the system, so that the operation temperature range of the inner side of the heat pump is relatively limited and the preheating device consumes very much energy.
Disclosure of Invention
The invention aims to provide an air conditioning unit and a control method, which aim to realize execution and control of multiple working modes through the same air conditioning unit and achieve the purpose of running in the most energy-saving mode under different working conditions inside and outside a self-adaptive room.
In a first aspect, an air conditioning unit is provided, including:
The main loop comprises a compressor, a four-way valve, an outdoor heat exchanger, a second indoor heat exchanger and a first indoor heat exchanger which are sequentially communicated into a loop, wherein the first indoor heat exchanger is used for receiving first mixed air to perform heat exchange treatment, and the second indoor heat exchanger is used for receiving second mixed air to perform heat exchange treatment and outputting air indoors;
the control module is used for regulating and controlling the refrigerant flow of the first indoor heat exchanger and the second indoor heat exchanger and the heat exchange treatment mode according to the environmental information;
The first mixed wind is the mixed wind of outdoor fresh air and indoor return air, the second mixed wind is the mixed wind of the air outlet of the first indoor heat exchanger and the indoor return air, the environment information comprises indoor temperature, indoor humidity, outlet temperature of the first indoor heat exchanger, air outlet temperature, air outlet humidity and/or outdoor temperature, and the heat exchange treatment mode comprises heat moisture treatment, constant moisture heating treatment and/or heating treatment.
In some embodiments, the air conditioning unit further comprises:
The first temperature and humidity sensor is used for acquiring indoor temperature and indoor humidity;
an outlet temperature sensor for acquiring an outlet temperature of the first indoor heat exchanger;
The mode for regulating the refrigerant flow and heat exchange treatment of the first indoor heat exchanger and the second indoor heat exchanger according to the environmental information comprises the following steps:
Controlling the first indoor heat exchanger to receive the first mixed air for heat-humidity treatment based on the indoor temperature, the indoor humidity and the outlet temperature of the first indoor heat exchanger, and controlling the second indoor heat exchanger to receive the second mixed air for equal-moisture heating treatment and to output air to the indoor;
The air conditioning unit is in a refrigerating state.
In some embodiments, the air conditioning unit further comprises:
The second temperature and humidity sensor is used for acquiring the air outlet temperature and the air outlet humidity;
an outlet temperature sensor for acquiring an outlet temperature of the first indoor heat exchanger;
The mode for regulating the refrigerant flow and heat exchange treatment of the first indoor heat exchanger and the second indoor heat exchanger according to the environmental information comprises the following steps:
controlling the first indoor heat exchanger to receive the first mixed air for heat-humidity treatment based on the air outlet temperature, the air outlet humidity and the outlet temperature of the first indoor heat exchanger, and controlling the second indoor heat exchanger to receive the second mixed air for constant-moisture heating treatment and air outlet to the indoor;
The air conditioning unit is in a refrigerating state.
In some embodiments, the air conditioning unit further comprises:
The mode for regulating the refrigerant flow and heat exchange treatment of the first indoor heat exchanger and the second indoor heat exchanger according to the environmental information comprises the following steps:
Based on the heat load of the air conditioning unit, controlling the first indoor heat exchanger to receive the first mixed air for heating treatment, and controlling the second indoor heat exchanger to receive the second mixed air for heating treatment and outputting air indoors;
the air conditioning unit is in a heating state.
In some embodiments, the air conditioning unit further comprises:
the indoor unit is provided with a first cavity for setting the first indoor heat exchanger and a second cavity for setting the second indoor heat exchanger;
the first cavity is provided with a fresh air valve, a first return air valve and a second return air valve;
The second cavity is provided with a first air inlet valve and a second air inlet valve, and the second cavity is communicated with the first cavity through the first air inlet valve and the second air inlet valve;
The outdoor fresh air introduced by the fresh air valve and the indoor return air introduced by the first return air valve form the first mixed air, the air outlet of the first indoor heat exchanger and the indoor return air introduced by the second return air valve form the second mixed air, and the air outlet of the second indoor heat exchanger and the second mixed air introduced by the first air inlet valve form the third mixed air;
The control module is used for controlling the opening degrees of the first air return valve, the second air return valve, the first air inlet valve and the second air inlet valve respectively.
In some embodiments, when the air conditioning unit is in a heating state, the refrigerant output by the compressor sequentially flows through the four-way valve, the first indoor heat exchanger, the second indoor heat exchanger and the outdoor heat exchanger, and the refrigerant output by the outdoor heat exchanger flows back to the compressor through the four-way valve;
When the air conditioning unit is in a refrigerating state, the refrigerant output by the compressor sequentially flows through the four-way valve, the outdoor heat exchanger, the second indoor heat exchanger and the first indoor heat exchanger, and the refrigerant output by the first indoor heat exchanger flows back to the compressor through the four-way valve.
In a second aspect, a control method of an air conditioning unit is provided, including:
acquiring environmental information;
regulating and controlling the refrigerant flow and the heat exchange treatment mode of a first indoor heat exchanger and a second indoor heat exchanger in the air conditioning unit according to the environmental information;
The air conditioning unit comprises a main loop, wherein the main loop comprises a compressor, a four-way valve, an outdoor heat exchanger, a second indoor heat exchanger and a first indoor heat exchanger which are sequentially communicated into a loop, the first indoor heat exchanger is used for receiving first mixed air for heat exchange treatment, and the second indoor heat exchanger is used for receiving second mixed air for heat exchange treatment and outputting indoor air; the first mixed wind is the mixed wind of outdoor fresh air and indoor return air, the second mixed wind is the mixed wind of the air outlet of the first indoor heat exchanger and the indoor return air, the environment information comprises indoor temperature, indoor humidity, outlet temperature of the first indoor heat exchanger, air outlet temperature, air outlet humidity and/or outdoor temperature, and the heat exchange treatment mode comprises heat moisture treatment, constant moisture heating treatment and/or heating treatment.
In some embodiments, the controlling the refrigerant flow and the heat exchange treatment mode of the first indoor heat exchanger and the second indoor heat exchanger in the air conditioning unit according to the environmental information includes:
Controlling the first indoor heat exchanger to receive the first mixed air for heat-humidity treatment based on the indoor temperature, the indoor humidity and the outlet temperature of the first indoor heat exchanger, and controlling the second indoor heat exchanger to receive the second mixed air for equal-moisture heating treatment and to output air to the indoor;
The air conditioning unit is in a refrigerating state.
In some embodiments, the controlling the refrigerant flow and the heat exchange treatment mode of the first indoor heat exchanger and the second indoor heat exchanger in the air conditioning unit according to the environmental information includes:
controlling the first indoor heat exchanger to receive the first mixed air for heat-humidity treatment based on the air outlet temperature, the air outlet humidity and the outlet temperature of the first indoor heat exchanger, and controlling the second indoor heat exchanger to receive the second mixed air for constant-moisture heating treatment and air outlet to the indoor;
The air conditioning unit is in a refrigerating state.
In some embodiments, the controlling the refrigerant flow and the heat exchange treatment mode of the first indoor heat exchanger and the second indoor heat exchanger in the air conditioning unit according to the environmental information includes:
Based on the heat load of the air conditioning unit, controlling the first indoor heat exchanger to receive the first mixed air for heating treatment, and controlling the second indoor heat exchanger to receive the second mixed air for heating treatment and outputting air indoors;
the air conditioning unit is in a heating state.
The invention has the beneficial effects that: the multi-working-mode air conditioning system has the advantages that the execution and control of multiple working modes are realized through one unit mechanism, a serial hierarchical heat exchange structure and multiple air mixing treatments are arranged, the air with different grade sources is reasonably utilized to carry out sectional mixing treatment, condensation temperature is further reduced, supercooling degree is further improved, accordingly, air conditioning energy efficiency is improved, the defect that electricity consumption is high due to the fact that an electric reheating temperature regulation mode and a hot air parallel shunting reheating mode are adopted after dehumidification is overcome, and cold energy consumption is saved.
Drawings
Fig. 1 is a schematic structural diagram of an air conditioning unit according to an embodiment of the present disclosure.
Fig. 2 is a flowchart of a control method of an air conditioning unit according to an embodiment of the present disclosure.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, an air conditioning unit according to an embodiment of the present invention includes a main circuit including a compressor 100, a four-way valve 200, an outdoor heat exchanger 300, a second indoor heat exchanger 500, and a first indoor heat exchanger 400 sequentially connected in a circuit, the first indoor heat exchanger 400 for receiving a first mixed air to perform heat exchange processing, the second indoor heat exchanger 500 for receiving a second mixed air to perform heat exchange processing, and discharging air to the indoor, and a control module for regulating refrigerant flow rates of the first indoor heat exchanger 400 and the second indoor heat exchanger 500 and a mode of the heat exchange processing according to environmental information. The first mixed wind is the mixed wind of the outdoor fresh air and the indoor return air, the second mixed wind is the mixed wind of the air outlet of the first indoor heat exchanger 400 and the indoor return air, the environmental information comprises the indoor temperature, the indoor humidity, the outlet temperature of the first indoor heat exchanger 400, the air outlet temperature, the air outlet humidity and/or the outdoor temperature, and the mode of the heat exchange treatment comprises heat and humidity treatment, constant moisture heating treatment and/or heating treatment.
Specifically, the sensors are configured at corresponding positions to collect environmental information, the collected environmental information is sent to the control module, the type of the environmental information obtained by the control module regulates and controls the refrigerant flow and the heat exchange treatment mode of the first indoor heat exchanger 400 and the second indoor heat exchanger 500, and meanwhile, the control module controls the air conditioning unit to be in a refrigerating state or a heating state. Under the control of the control module, the control module sets the refrigerant flow and the heat exchange treatment mode of the first indoor heat exchanger 400 and the second indoor heat exchanger 500, the heat exchange treatment mode of the first indoor heat exchanger 400 and the second indoor heat exchanger 500 comprises one of heat wet treatment, equal moisture heating treatment and heating treatment, the outdoor fresh air and the indoor return air are mixed for the first time to form first mixed air, the first indoor heat exchanger 400 receives the first mixed air to perform heat exchange treatment, the air outlet of the heat exchange treatment of the first indoor heat exchanger 400 is mixed with the indoor return air for the second time to form second mixed air, the second indoor heat exchanger 500 receives the second mixed air to perform heat exchange treatment, and the air outlet of the heat exchange treatment of the second indoor heat exchanger 500 is wind outlet of the indoor. The above processes are continuously and reciprocally circulated, and the execution and control of various operation modes are realized through the hierarchical heat exchange process and the heat exchange mode conversion of the first indoor heat exchanger 400 and the second indoor heat exchanger 500.
Referring again to fig. 1, an oil separator 610 is connected to an exhaust end of the compressor 100, an oil outlet end of the oil separator 610 is connected to a crankcase of the compressor 100, an air outlet end of the oil separator 610 is connected to the outdoor heat exchanger 300 through the four-way valve 200, a first end of the four-way valve 200 is connected to the oil separator 610, a second end of the four-way valve 200 is connected to the outdoor heat exchanger 300, a third end of the four-way valve 200 is connected to a gas-liquid separator 620, a third end of the four-way valve 200 is connected to an air return end of the compressor 100 through the gas-liquid separator 620, a fourth end of the four-way valve 200 is connected to a first stop valve 630, one end of the outdoor heat exchanger 300 is connected to a second stop valve 640, one end of the second stop valve 640, which is far from the outdoor heat exchanger 300, is connected to one end of the second indoor heat exchanger 500 and to a flow regulating valve 650, another end of the second indoor heat exchanger 500 and one end of the flow regulating valve 650, which is far from the outdoor heat exchanger 300, are sequentially connected to an electronic expansion valve 660 and a liquid separating head 670, one end of the liquid separating head 670, which is far from the electronic expansion valve is connected to an end of the first indoor heat exchanger 400, and another end of the first indoor heat exchanger 400 is connected to the first end of the fourth heat exchanger 400 through the first stop valve 630.
When the air conditioning unit is in a heating state, the refrigerant output by the compressor 100 sequentially flows through the four-way valve 200, the first indoor heat exchanger 400, the second indoor heat exchanger 500 and the outdoor heat exchanger 300, and the refrigerant output by the outdoor heat exchanger 300 flows back to the compressor 100 through the four-way valve 200; when the air conditioning unit is in a refrigeration state, the refrigerant output by the compressor 100 sequentially flows through the four-way valve 200, the outdoor heat exchanger 300, the second indoor heat exchanger 500 and the first indoor heat exchanger 400, and the refrigerant output by the first indoor heat exchanger 400 flows back to the compressor 100 through the four-way valve 200.
In the refrigeration state, the refrigerant is pressurized from the compressor 100 to discharge high-temperature and high-pressure superheated gas, the lubricating oil is separated by the oil separator 610, the separated lubricating oil is filtered by the filter and then is subjected to decompression and flow limitation by the capillary tube to return to the crankcase of the compressor 100, the high-temperature superheated refrigerant after oil separation flows to the outdoor heat exchanger 300 through the second end of the four-way valve 200, the refrigerant is cooled by heat dissipation in the outdoor heat exchanger 300 and then condensed into supercooled liquid, part of the refrigerant output by the outdoor heat exchanger 300 flows to the second indoor heat exchanger 500 to be supercooled for the second time after passing through the second stop valve 640, the second mixed air passing through the second indoor heat exchanger 500 is heated, the other part of the refrigerant passes through the second stop valve 640 and then is subjected to flow regulating valve 650 to be used as bypass, the two parts of the refrigerant are converged and then enter the electronic expansion valve 660 to be subjected to flow limitation and cooling, the refrigerant is output to the first indoor heat exchanger 400 through the liquid separation head 670, the internal heat of the first indoor heat exchanger 400 is absorbed, and the refrigerant output by the first indoor heat exchanger 400 returns to the compressor 100 after passing through the first stop valve 630, the valve 200 and the gas-liquid separator 620. The process is continuously and circularly operated in a reciprocating mode, and therefore indoor heating is achieved.
In the heating state, the refrigerant is pressurized from the compressor 100 to discharge high-temperature and high-pressure superheated gas, lubricating oil is separated by the oil separator 610, impurities in the oil are filtered by the filter, the separated lubricating oil is filtered by the filter, the impurities in the oil are decompressed and limited by the capillary tube and returned to the crankcase of the compressor 100, the high-temperature superheated refrigerant after oil separation flows out through the fourth end of the four-way valve 200, flows to the first indoor heat exchanger 400 through the first stop valve 630 and is condensed to form high-temperature liquid, the refrigerant output by the first indoor heat exchanger 400 enters the one-way valve 680 through the liquid separation head 670, one part of the refrigerant output by the one-way valve 680 enters the second indoor heat exchanger 500 to continue condensation, the other part of the refrigerant enters the outdoor heat exchanger 300 through the flow regulating valve 650 to be used as bypass, the two parts of the refrigerant are converged and then enter the outdoor heat exchanger 300 to be evaporated and absorbed to become superheated steam through the second stop valve 640, and the refrigerant output by the outdoor heat exchanger 300 flows to the gas-liquid separator 620 through the third end of the four-way valve 200, and finally flows back to the compressor 100 through the gas-liquid separator 620. The process is continuously and reciprocally circulated, so that indoor refrigeration is realized.
Referring again to fig. 1, the air conditioning unit further includes an indoor unit 700, and the indoor unit 700 is provided with a first cavity 710 for setting the first indoor heat exchanger 400 and a second cavity 720 for setting the second indoor heat exchanger 500. The first chamber 710 is provided with a fresh air valve 730, a first return air valve 740, and a second return air valve 750; the second cavity 720 is provided with a first air inlet valve 760 and a second air inlet valve 770, and the second cavity 720 is communicated with the first cavity 710 through the first air inlet valve 760 and the second air inlet valve 770; the outdoor fresh air introduced by the fresh air valve 730 and the indoor return air introduced by the first return air valve 740 form a first mixed air, the air outlet of the first indoor heat exchanger 400 and the indoor return air introduced by the second return air valve 750 form a second mixed air, and the air outlet of the second indoor heat exchanger 500 and the second mixed air introduced by the first air inlet valve 760 form a third mixed air; the control module is used for controlling the opening degrees of the first air return valve 740, the second air return valve 750, the first air inlet valve 760 and the second air inlet valve 770 respectively.
Specifically, the fresh air valve 730 is used for introducing outdoor fresh air into the first cavity 710, the first air return valve 740 and the second air return valve 750 are respectively used for introducing indoor return air into the first cavity 710, the first air inlet valve 760 and the second air inlet valve 770 are respectively used for introducing second mixed air into the second cavity 720, the second indoor heat exchanger 500 receives the second mixed air through the second air inlet valve 770, and when the second indoor heat exchanger 500 outputs air indoors, the air outlet of the second indoor heat exchanger 500 and the second mixed air introduced by the first air inlet valve 760 form third mixed air and then output air indoors.
More specifically, in this embodiment, the level heat exchange process of the first indoor heat exchanger 400 and the second indoor heat exchanger 500 is performed with three times of air mixing, the first time of air mixing is performed by introducing outdoor fresh air through the fresh air valve 730 and introducing indoor return air through the first return air valve 740, the second time of air mixing is performed by introducing indoor return air through the first indoor heat exchanger 400 and outputting air-out and the second return air valve 750, and the third time of air mixing is performed by introducing second time of air mixing through the second indoor heat exchanger 500 and outputting air-out and the first air inlet valve 760. In the air mixing process, the control module controls the opening degrees of the first air return valve 740, the second air return valve 750, the first air inlet valve 760 and the second air inlet valve 770 respectively, and controls the air quantity ratio of the first air mixing, the second air mixing and the third air mixing. The opening degree adjustment logic of the first air return valve 740 is opposite to the opening degree adjustment logic of the second air return valve 750, and the opening degree adjustment logic of the first air inlet valve 760 is opposite to the opening degree adjustment logic of the second air inlet valve 770, that is, the opening degree of the second air return valve 750 is adjusted to be reduced when the opening degree of the first air return valve 740 is adjusted to be increased, the opening degree of the second air return valve 750 is adjusted to be increased when the opening degree of the first air return valve 740 is adjusted to be reduced, the opening degree of the second air inlet valve 770 is adjusted to be reduced when the opening degree of the first air inlet valve 760 is adjusted to be reduced, and the opening degree of the second air inlet valve 770 is adjusted to be increased when the opening degree of the first air inlet valve 760 is adjusted to be reduced.
In some embodiments, the air conditioning unit further includes a first temperature and humidity sensor 810 and an outlet temperature sensor 850, the first temperature and humidity sensor 810 being used to obtain the indoor temperature and the indoor humidity, the outlet temperature sensor 850 being used to obtain the outlet temperature of the first indoor heat exchanger 400; the mode of regulating the refrigerant flow rate and the heat exchange process of the first indoor heat exchanger 400 and the second indoor heat exchanger 500 according to the environmental information includes: based on the indoor temperature, the indoor humidity, and the outlet temperature of the first indoor heat exchanger 400, the first indoor heat exchanger 400 is controlled to receive the outdoor fresh air and the indoor return air for heat-moisture treatment, and the second indoor heat exchanger 500 is controlled to receive the outlet air and the indoor return air of the first indoor heat exchanger 400 for equal moisture heating treatment and to outlet air to the indoor. The air conditioning unit is in a refrigerating state.
Specifically, outdoor fresh air is introduced through the fresh air valve 730, indoor return air is introduced through the first return air valve 740 with the opening controlled by the control module to form first mixed air, the first indoor heat exchanger 400 receives the first mixed air for heat and humidity treatment, the air outlet of the first indoor heat exchanger 400 is mixed with the indoor return air of the second return air valve 750 with the opening controlled by the control module for the second time to form second mixed air, the second mixed air enters the second cavity 720 through the first air inlet valve 760 and the second air inlet valve 770 with the opening controlled by the control module respectively, the opening of the first air inlet valve 760 and the opening of the second air inlet valve 770 are regulated based on the outlet temperature of the first indoor heat exchanger 400, the second mixed air through the first air inlet valve 760 directly enters the second cavity 720, the second mixed air through the second air inlet valve 770 enters the second indoor heat exchanger 500 for equal moisture heating treatment, the air outlet of the second indoor heat exchanger 500 is mixed with the second mixed air through the first air inlet valve 760 for the third time to obtain third mixed air, the air outlet of the second cavity 720 is provided with the air outlet of the third air outlet 780, and the third mixed air outlet 780 is received through the third air outlet 780.
Under the control of the control module, the above process continuously and reciprocally circulates, the control module takes constant indoor temperature and indoor humidity as adjustment targets, and respectively controls the opening of the first return air valve 740, the second return air valve 750, the first air inlet valve 760 and the second air inlet valve 770 and the refrigerant input flow of the first indoor heat exchanger 400 and the second indoor heat exchanger 500, the first indoor heat exchanger 400 receives outdoor fresh air and indoor return air for heat humidity treatment, the second indoor heat exchanger 500 receives air outlet air and indoor return air of the first indoor heat exchanger 400 for constant moisture heating treatment, the second indoor heat exchanger 500 is used as a reheat condenser, and the mode of connecting the first indoor heat exchanger 400 with the second indoor heat exchanger 500 in series is adopted, so that lower condensation temperature and larger supercooling degree are further obtained under the condition of meeting reheat demand, and the indoor constant temperature and humidity adjustment effect is realized.
Further, the control module adjusts the reheat amount by controlling the opening degrees of the first and second inlet valves 760 and 770. When reheating is needed, firstly, the refrigerant flow of the first indoor heat exchanger 400 is regulated, secondly, the opening degrees of the first air inlet valve 760 and the second air inlet valve 770 are regulated, and when the second air inlet valve 770 is fully opened, the fan of the outdoor heat exchanger 300 is regulated again, so that the fan of the outdoor heat exchanger 300 is reduced in frequency, more refrigerant heat is transferred to the second indoor heat exchanger 500 to be dissipated, and continuous regulation of the reheating is realized.
Preferably, the refrigerant input flow rate adjustment of the first and second indoor heat exchangers 400 and 500 may be achieved by adjusting the opening degrees of the second shut-off valve 640, the flow rate adjustment valve 650, and the electronic expansion valve 660, and the air intake rate adjustment of the first and second indoor heat exchangers 400 and 500 may be achieved by limiting the air intake rates of the first and second indoor heat exchangers 400 and 500.
In some embodiments, the air conditioning unit further includes a second temperature and humidity sensor 820 and an outlet temperature sensor 850, wherein the second temperature and humidity sensor 820 is used for acquiring the outlet temperature and the outlet humidity, and the outlet temperature sensor 850 is used for acquiring the outlet temperature of the first indoor heat exchanger 400; the mode of regulating the refrigerant flow rate and the heat exchange process of the first indoor heat exchanger 400 and the second indoor heat exchanger 500 according to the environmental information includes: based on the outlet temperature, the outlet humidity, and the outlet temperature of the first indoor heat exchanger 400, the first indoor heat exchanger 400 is controlled to receive the outdoor fresh air and the indoor return air for heat-moisture treatment, and the second indoor heat exchanger 500 is controlled to receive the outlet air and the indoor return air of the first indoor heat exchanger 400 for equal moisture heating treatment and to outlet air to the indoor. The air conditioning unit is in a refrigerating state.
The difference from the above embodiment is that the second temperature and humidity sensor 820 is disposed at the air outlet of the second cavity 720, the controller receives the air outlet temperature and the air outlet humidity obtained by the second temperature and humidity sensor 820, and controls the opening of the first air return valve 740, the second air return valve 750, the first air inlet valve 760 and the second air inlet valve 770 and the refrigerant input flow of the first indoor heat exchanger 400 and the second indoor heat exchanger 500 respectively with the constant air outlet temperature and the constant air outlet humidity as the adjustment targets, the first indoor heat exchanger 400 receives the outdoor fresh air and the indoor return air for heat and humidity treatment, and the second indoor heat exchanger 500 receives the air outlet and the indoor return air of the first indoor heat exchanger 400 for equal moisture heating treatment, so as to achieve the adjustment effect of the constant air outlet temperature and the constant air outlet humidity.
In some embodiments, the mode of regulating the refrigerant flow and the heat exchange process of the first indoor heat exchanger 400 and the second indoor heat exchanger 500 according to the environmental information includes: based on the heat load of the air conditioning unit, the first indoor heat exchanger 400 is controlled to receive the first mixed air for heating treatment, and the second indoor heat exchanger 500 is controlled to receive the second mixed air for heating treatment and to discharge the air into the room. The air conditioning unit is in a heating state.
Referring again to fig. 1, the exhaust end of the compressor 100 is provided with a first pressure sensor 830, and the return air end of the compressor 100 is provided with a second pressure sensor 840, and in this embodiment, the heat load of the air conditioning unit is measured by the return air temperature, the first pressure information collected by the first pressure sensor 830, and the second pressure information of the second pressure sensor 840.
The outdoor fresh air is introduced through the fresh air valve 730, the indoor return air is introduced through the first return air valve 740 with the opening controlled by the control module to form first mixed air, the first indoor heat exchanger 400 receives the first mixed air for heating treatment, the air outlet of the first indoor heat exchanger 400 is mixed with the indoor return air of the second return air valve 750 with the opening controlled by the control module for the second time to form second mixed air, the second mixed air enters the second cavity 720 through the first air inlet valve 760 and the second air inlet valve 770 with the opening controlled by the control module respectively, the second mixed air directly enters the second cavity 720 through the second air inlet valve 760, the second mixed air through the second air inlet valve 770 enters the second indoor heat exchanger 500 for heating treatment, the air outlet of the second indoor heat exchanger 500 is mixed with the second mixed air through the first air inlet valve 760 for the third time to obtain third mixed air, the air outlet of the second cavity 720 is provided with the air outlet 780, and the air outlet 780 receives the third mixed air and then flows out from the air outlet of the second cavity 720.
Under the control of the control module, the process continuously and reciprocally circulates, changes of the heat load of the air conditioning unit are self-adaptive to distribute heating air quantity and heating area, the control module obtains the return air temperature of the air conditioning unit through the temperature sensor, when the return air temperature is greater than a return air temperature threshold value, whether the ratio of the first pressure information to the second pressure information is greater than a first pressure ratio or not is judged, and whether the second pressure information is greater than the first return air pressure threshold value or not is judged, if both the first pressure information and the second pressure information are greater than the first return air pressure threshold value, the compressor 100 is controlled to reduce the frequency, otherwise, the air mixing proportion of the first air mixture and the air mixing proportion of the second air mixture are regulated, or the compressor 100 is controlled to increase the frequency, so that the heat exchange rate of the first indoor heat exchanger 400 and the second indoor heat exchanger 500 is improved; when the return air temperature is not greater than the return air temperature threshold value, judging whether the ratio of the first pressure information to the second pressure information is smaller than the second pressure ratio and judging whether the second pressure information is smaller than the second return air pressure threshold value, if yes, controlling the compressor 100 to raise the frequency, otherwise, adjusting the mixing proportion of the first mixed air and the mixing proportion of the second mixed air, or controlling the compressor 100 to lower the frequency, so that the heat exchange rate of the first indoor heat exchanger 400 and the second indoor heat exchanger 500 is lowered. Wherein the first pressure ratio is less than the second pressure ratio and the first return air pressure threshold is less than the second return air pressure threshold.
In some embodiments, the control module controls the second air return valve 750 and the second air inlet valve 770 to be in a closed state, controls the fresh air valve 730, the first air return valve 740 and the first air inlet valve 760 to be in an open state, and after primary air mixing, the outdoor fresh air and the indoor return air sequentially pass through the first cavity 710 and the second cavity 720, and finally are output from the air outlet of the second cavity 720 to the indoor under the action of the air outlet fan 780, so that the ventilation mode is realized.
The air conditioning unit disclosed by the invention realizes execution and control of multiple working modes through one unit mechanism, sets a serial hierarchical heat exchange structure and carries out multiple air mixing treatment, and air with different grade sources is reasonably utilized to carry out sectional mixing treatment, so that the condensation temperature is further reduced, the supercooling degree is further improved, the air conditioning energy efficiency is further improved, the defect of high electricity consumption caused by adopting an electric reheating temperature regulation mode and a hot air parallel split reheating mode in return air is overcome, and the cold energy consumption is saved.
As shown in fig. 2, a control method of an air conditioning unit according to an embodiment of the present invention includes:
Step S100, obtaining environment information;
And step 200, regulating and controlling the refrigerant flow and the heat exchange treatment mode of the first indoor heat exchanger and the second indoor heat exchanger in the air conditioning unit according to the environmental information.
The air conditioning unit comprises a main loop, wherein the main loop comprises a compressor, a four-way valve, an outdoor heat exchanger, a second indoor heat exchanger and a first indoor heat exchanger which are sequentially communicated into a loop, the first indoor heat exchanger is used for receiving first mixed air to perform heat exchange treatment, and the second indoor heat exchanger is used for receiving second mixed air to perform heat exchange treatment and outputting indoor air; the first mixed wind is the mixed wind of outdoor fresh air and indoor return air, the second mixed wind is the mixed wind of the air outlet of the first indoor heat exchanger and the indoor return air, the environment information comprises indoor temperature, indoor humidity, outlet temperature of the first indoor heat exchanger, air outlet temperature, air outlet humidity and/or outdoor temperature, and the heat exchange treatment mode comprises heat moisture treatment, constant moisture heating treatment and/or heating treatment.
In some embodiments, regulating the refrigerant flow and the heat exchange treatment pattern of the first indoor heat exchanger and the second indoor heat exchanger in the air conditioning unit according to the environmental information includes:
controlling the first indoor heat exchanger to receive the first mixed air for heat-humidity treatment based on the indoor temperature, the indoor humidity and the outlet temperature of the first indoor heat exchanger, and controlling the second indoor heat exchanger to receive the second mixed air for constant moisture heating treatment and air-out to the indoor;
The air conditioning unit is in a refrigerating state.
In some embodiments, regulating the refrigerant flow and the heat exchange treatment pattern of the first indoor heat exchanger and the second indoor heat exchanger in the air conditioning unit according to the environmental information includes:
based on the air outlet temperature, the air outlet humidity and the outlet temperature of the first indoor heat exchanger, controlling the first indoor heat exchanger to receive the first mixed air for heat-humidity treatment, and controlling the second indoor heat exchanger to receive the second mixed air for constant moisture heating treatment and air outlet to the indoor;
The air conditioning unit is in a refrigerating state.
In some embodiments, regulating the refrigerant flow and the heat exchange treatment pattern of the first indoor heat exchanger and the second indoor heat exchanger in the air conditioning unit according to the environmental information includes:
Based on the heat load of the air conditioning unit, controlling the first indoor heat exchanger to receive the first mixed air for heating treatment, and controlling the second indoor heat exchanger to receive the second mixed air for heating treatment and outputting air indoors;
the air conditioning unit is in a heating state.
The control method of the air conditioning unit disclosed by the invention realizes execution and control of multiple working modes through one unit mechanism, sets a serial hierarchical heat exchange structure and carries out multiple air mixing treatment, reasonably utilizes air from different grade sources to carry out sectional mixing treatment, and is further beneficial to further reducing condensation temperature and further improving supercooling degree, thereby improving the energy efficiency of the air conditioner, overcoming the defect of high electricity consumption by adopting an electric reheating temperature regulation mode and a hot gas parallel split reheating mode after dehumidification, and saving cold energy consumption.
The control method of the air conditioning unit provided by the embodiment of the present disclosure realizes the control of the air conditioning unit of the foregoing embodiment, and specific limitation regarding the control method of the air conditioning unit may be referred to the limitation of the air conditioning unit hereinabove, which is not repeated herein.
The above described apparatus embodiments are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, i.e. may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
The terms "first," "second," "third," "fourth," and the like in the description of the application and in the above figures, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, and thus do not limit the scope of the claims of the present invention. The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments. In addition, while a logical order is illustrated in the flowchart, in some cases, the steps illustrated or described may be performed in a different order than is shown.
Those skilled in the art will appreciate that many modifications are possible in which the invention is practiced without departing from its scope or spirit, e.g., features of one embodiment can be used with another embodiment to yield yet a further embodiment. Preferred embodiments of the disclosed embodiments are described above with reference to the accompanying drawings, and thus do not limit the scope of the claims of the disclosed embodiments. Any modifications, equivalent substitutions and improvements made by those skilled in the art without departing from the scope and spirit of the embodiments of the present disclosure shall fall within the scope of the claims of the embodiments of the present disclosure.
Claims (9)
1. An air conditioning unit, comprising:
The main loop comprises a compressor, a four-way valve, an outdoor heat exchanger, a second indoor heat exchanger and a first indoor heat exchanger which are sequentially communicated into a loop, wherein the first indoor heat exchanger is used for receiving first mixed air to perform heat exchange treatment, and the second indoor heat exchanger is used for receiving second mixed air to perform heat exchange treatment and outputting air indoors;
the control module is used for regulating and controlling the refrigerant flow of the first indoor heat exchanger and the second indoor heat exchanger and the heat exchange treatment mode according to the environmental information;
The first mixed wind is the mixed wind of outdoor fresh wind and indoor return wind, the second mixed wind is the mixed wind of the air outlet of the first indoor heat exchanger and the indoor return wind, the environment information comprises indoor temperature, indoor humidity, outlet temperature of the first indoor heat exchanger, air outlet temperature, air outlet humidity and/or outdoor temperature, and the heat exchange treatment mode comprises heat moisture treatment, constant moisture heating treatment and/or heating treatment;
the indoor unit is provided with a first cavity for setting the first indoor heat exchanger and a second cavity for setting the second indoor heat exchanger;
the first cavity is provided with a fresh air valve, a first return air valve and a second return air valve;
The second cavity is provided with a first air inlet valve and a second air inlet valve, and the second cavity is communicated with the first cavity through the first air inlet valve and the second air inlet valve;
The outdoor fresh air introduced by the fresh air valve and the indoor return air introduced by the first return air valve form the first mixed air, the air outlet of the first indoor heat exchanger and the indoor return air introduced by the second return air valve form the second mixed air, and the air outlet of the second indoor heat exchanger and the second mixed air introduced by the first air inlet valve form the third mixed air;
The control module is used for controlling the opening degrees of the first air return valve, the second air return valve, the first air inlet valve and the second air inlet valve respectively;
The first air inlet valve and the second air inlet valve are respectively used for introducing the second mixed air into the second cavity, the second air inlet valve is communicated with the second indoor heat exchanger, and the second indoor heat exchanger receives the second mixed air through the second air inlet valve; when the second indoor heat exchanger is used for exhausting air indoors, the air outlet of the second indoor heat exchanger and the second air mixing introduced by the first air inlet valve form third air mixing, and then the air is exhausted indoors.
2. The air conditioning assembly of claim 1, further comprising:
The first temperature and humidity sensor is used for acquiring indoor temperature and indoor humidity;
an outlet temperature sensor for acquiring an outlet temperature of the first indoor heat exchanger;
The mode for regulating the refrigerant flow and heat exchange treatment of the first indoor heat exchanger and the second indoor heat exchanger according to the environmental information comprises the following steps:
Controlling the first indoor heat exchanger to receive the first mixed air for heat-humidity treatment based on the indoor temperature, the indoor humidity and the outlet temperature of the first indoor heat exchanger, and controlling the second indoor heat exchanger to receive the second mixed air for equal-moisture heating treatment and to output air to the indoor;
The air conditioning unit is in a refrigerating state.
3. The air conditioning assembly of claim 1, further comprising:
The second temperature and humidity sensor is used for acquiring the air outlet temperature and the air outlet humidity;
an outlet temperature sensor for acquiring an outlet temperature of the first indoor heat exchanger;
The mode for regulating the refrigerant flow and heat exchange treatment of the first indoor heat exchanger and the second indoor heat exchanger according to the environmental information comprises the following steps:
controlling the first indoor heat exchanger to receive the first mixed air for heat-humidity treatment based on the air outlet temperature, the air outlet humidity and the outlet temperature of the first indoor heat exchanger, and controlling the second indoor heat exchanger to receive the second mixed air for constant-moisture heating treatment and air outlet to the indoor;
The air conditioning unit is in a refrigerating state.
4. The air conditioning assembly of claim 1, further comprising:
The mode for regulating the refrigerant flow and heat exchange treatment of the first indoor heat exchanger and the second indoor heat exchanger according to the environmental information comprises the following steps:
Based on the heat load of the air conditioning unit, controlling the first indoor heat exchanger to receive the first mixed air for heating treatment, and controlling the second indoor heat exchanger to receive the second mixed air for heating treatment and outputting air indoors;
the air conditioning unit is in a heating state.
5. An air conditioning assembly according to any of claims 1 to 4, characterized in that,
When the air conditioning unit is in a heating state, the refrigerant output by the compressor sequentially flows through the four-way valve, the first indoor heat exchanger, the second indoor heat exchanger and the outdoor heat exchanger, and the refrigerant output by the outdoor heat exchanger flows back to the compressor through the four-way valve;
When the air conditioning unit is in a refrigerating state, the refrigerant output by the compressor sequentially flows through the four-way valve, the outdoor heat exchanger, the second indoor heat exchanger and the first indoor heat exchanger, and the refrigerant output by the first indoor heat exchanger flows back to the compressor through the four-way valve.
6. A control method of an air conditioning unit, applied to the air conditioning unit of claim 1, the control method comprising:
acquiring environmental information;
regulating and controlling the refrigerant flow and the heat exchange treatment mode of a first indoor heat exchanger and a second indoor heat exchanger in the air conditioning unit according to the environmental information;
The air conditioning unit comprises a main loop, wherein the main loop comprises a compressor, a four-way valve, an outdoor heat exchanger, a second indoor heat exchanger and a first indoor heat exchanger which are sequentially communicated into a loop, the first indoor heat exchanger is used for receiving first mixed air for heat exchange treatment, and the second indoor heat exchanger is used for receiving second mixed air for heat exchange treatment and outputting indoor air; the first mixed wind is the mixed wind of outdoor fresh air and indoor return air, the second mixed wind is the mixed wind of the air outlet of the first indoor heat exchanger and the indoor return air, the environment information comprises indoor temperature, indoor humidity, outlet temperature of the first indoor heat exchanger, air outlet temperature, air outlet humidity and/or outdoor temperature, and the heat exchange treatment mode comprises heat moisture treatment, constant moisture heating treatment and/or heating treatment.
7. The method according to claim 6, wherein the controlling the refrigerant flow rate and the heat exchange treatment mode of the first indoor heat exchanger and the second indoor heat exchanger in the air conditioning unit according to the environmental information includes:
Controlling the first indoor heat exchanger to receive the first mixed air for heat-humidity treatment based on the indoor temperature, the indoor humidity and the outlet temperature of the first indoor heat exchanger, and controlling the second indoor heat exchanger to receive the second mixed air for equal-moisture heating treatment and to output air to the indoor;
The air conditioning unit is in a refrigerating state.
8. The method according to claim 6, wherein the controlling the refrigerant flow rate and the heat exchange treatment mode of the first indoor heat exchanger and the second indoor heat exchanger in the air conditioning unit according to the environmental information includes:
controlling the first indoor heat exchanger to receive the first mixed air for heat-humidity treatment based on the air outlet temperature, the air outlet humidity and the outlet temperature of the first indoor heat exchanger, and controlling the second indoor heat exchanger to receive the second mixed air for constant-moisture heating treatment and air outlet to the indoor;
The air conditioning unit is in a refrigerating state.
9. The method according to claim 6, wherein the controlling the refrigerant flow rate and the heat exchange treatment mode of the first indoor heat exchanger and the second indoor heat exchanger in the air conditioning unit according to the environmental information includes:
Based on the heat load of the air conditioning unit, controlling the first indoor heat exchanger to receive the first mixed air for heating treatment, and controlling the second indoor heat exchanger to receive the second mixed air for heating treatment and outputting air indoors;
the air conditioning unit is in a heating state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211030720.3A CN115435398B (en) | 2022-08-25 | Air conditioning unit and control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211030720.3A CN115435398B (en) | 2022-08-25 | Air conditioning unit and control method |
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| CN115435398A CN115435398A (en) | 2022-12-06 |
| CN115435398B true CN115435398B (en) | 2024-11-05 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109654598A (en) * | 2019-02-21 | 2019-04-19 | 南京天加环境科技有限公司 | A kind of adjustable air-conditioning system of heating condensing pressure and its control method |
| CN110986206A (en) * | 2019-12-27 | 2020-04-10 | 浙江普瑞泰环境设备股份有限公司 | Total heat fresh air exchange equipment with isothermal or temperature-rising dehumidification function |
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109654598A (en) * | 2019-02-21 | 2019-04-19 | 南京天加环境科技有限公司 | A kind of adjustable air-conditioning system of heating condensing pressure and its control method |
| CN110986206A (en) * | 2019-12-27 | 2020-04-10 | 浙江普瑞泰环境设备股份有限公司 | Total heat fresh air exchange equipment with isothermal or temperature-rising dehumidification function |
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