CN114719413A - Control method for improving exhaust temperature at low ring temperature - Google Patents
Control method for improving exhaust temperature at low ring temperature Download PDFInfo
- Publication number
- CN114719413A CN114719413A CN202210263521.0A CN202210263521A CN114719413A CN 114719413 A CN114719413 A CN 114719413A CN 202210263521 A CN202210263521 A CN 202210263521A CN 114719413 A CN114719413 A CN 114719413A
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- Prior art keywords
- temperature
- compressor
- exhaust
- exhaust temperature
- set value
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000002347 injection Methods 0.000 abstract description 3
- 239000007924 injection Substances 0.000 abstract description 3
- 230000001502 supplementing effect Effects 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 6
- 239000003507 refrigerant Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/46—Improving electric energy efficiency or saving
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
- F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Thermal Sciences (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a control method for improving exhaust temperature at low ring temperature, which starts low-temperature exhaust temperature control when a heating mode is started and if the outdoor environment temperature is lower than a set value t 0. In the heating operation process, when the exhaust temperature of the outdoor enhanced vapor injection compressor is lower than a set temperature value, if the compressor has a space for increasing the revolution, the exhaust temperature is preferentially increased by increasing the revolution of the compressor, and if the compressor cannot increase the frequency, the exhaust temperature of the compressor is increased by opening the electronic jet expansion valve to a certain opening degree and increasing the work of the compressor by supplementing air.
Description
Technical Field
The invention relates to a control method for improving exhaust temperature at low ring temperature.
Background
The multi-split air conditioner is commonly called as one-to-many air conditioner, that is, one outdoor unit can be connected with a plurality of indoor units to realize a system for refrigerating or heating a single room or a plurality of rooms.
The multi-split air conditioner has the particularity that the number of the outdoor units is only 1, the indoor units consist of a plurality of indoor units, and when the indoor units of a room are all started to heat in winter, the system pressure is low, so that the exhaust temperature of the system is also reduced.
When the outdoor environment temperature is lower than minus 12 ℃ or lower, the exhaust temperature of the outdoor compressor can be continuously reduced, so that the system returns liquid, and when the exhaust temperature or the exhaust superheat degree is lower than the requirement of the specification of the compressor, the compressor is finally damaged.
The current industry control mode is that when the outdoor temperature is low, because the temperature difference of outdoor heat exchange is small, namely the heat absorbed by an outdoor heat exchanger is small, when the exhaust temperature of a compressor is found to be too low or the exhaust superheat degree is low in the operation process, the flow of a refrigerant is reduced by closing a throttling electronic expansion valve of the outdoor heat exchanger so as to ensure the exhaust temperature or the exhaust superheat degree of the compressor, but when the throttling electronic expansion valve of the outdoor heat exchanger is closed, the circulation of the system refrigerant is small, the low pressure of the system is reduced, although the exhaust temperature of a unit is increased, the high pressure and the low pressure of the system are reduced, and the final heating effect is poor.
Disclosure of Invention
In view of the above problems, the present invention provides a control method for raising the exhaust temperature at low ring temperature, which effectively solves the problems pointed out in the background art.
The technical scheme adopted by the invention is as follows:
a control method for improving exhaust temperature at low ring temperature starts low-temperature exhaust temperature control when a heating mode is started and if outdoor environment temperature is lower than a set value t0, and comprises the following specific steps: monitoring the exhaust temperature t3 and the exhaust superheat t4 of the compressor, and if the exhaust temperature t3 is lower than a set value t1 or the exhaust superheat t4 is lower than a set value t2, performing system adjustment, specifically as follows: a) detecting whether the running frequency of the compressor is the highest frequency allowed by a system, if not, controlling the compressor to increase the running frequency to the highest frequency according to a set speed V1, and if so, starting an electronic jet expansion valve of the compressor to a set opening degree b; b) and monitoring the exhaust temperature t3 and the exhaust superheat degree t4 of the compressor, and if the exhaust temperature t3 is higher than a set value t1 or the exhaust superheat degree t4 is higher than a set value t2, controlling the electronic jet expansion valve of the compressor to increase according to a set rate V2 until the exhaust temperature t3 or the exhaust superheat degree t4 is stable, and maintaining the current opening.
Preferably, t0 is 0 ℃.
Preferably, t1 is 60 ℃ and t2 is 15 ℃.
Preferably, the V1 is 0.5 hz/s.
Preferably, b is 60 steps.
Preferably, the V2 is (t3-t1) step/30 seconds or (t4-t2) step/30 seconds.
In the heating operation process, when the exhaust temperature of the outdoor enhanced vapor injection compressor is lower than a set temperature value, if the compressor has a space for increasing the revolution, the exhaust temperature is preferentially increased by increasing the revolution of the compressor, and if the compressor cannot increase the frequency, the exhaust temperature of the compressor is increased by opening the electronic jet expansion valve to a certain opening degree and increasing the work of the compressor by supplementing air.
The invention has the following beneficial effects:
1. the electronic expansion valve for air injection of the compressor is started to increase the work of the compressor so as to improve the exhaust temperature and the exhaust superheat degree of the compressor, and the electronic expansion valve is not required to be throttled by turning down the outdoor heat exchanger, so that a certain amount of refrigerant circulation is ensured, the system reliability is ensured, and the indoor heating effect is ensured.
2. The electronic expansion valve of the compressor is opened to increase the work of the compressor so as to improve the exhaust temperature and the exhaust superheat degree of the compressor, the electronic expansion valve is not required to be throttled by turning down the outdoor heat exchanger, the low pressure of the system cannot be rapidly reduced, and therefore the heating time of the unit is prolonged, and the power consumption of ineffective defrosting is reduced.
Detailed Description
The present invention is described in further detail below with reference to specific examples.
Example 1
A control method for improving exhaust temperature at low ring temperature starts low-temperature exhaust temperature control when a heating mode is started, if outdoor environment temperature is lower than a set value t0, t0 is preferably 0 ℃, and the specific steps are as follows: monitoring the exhaust temperature t3 and the exhaust superheat t4 of the compressor, and if the exhaust temperature t3 is lower than a set value t1 or the exhaust superheat t4 is lower than a set value t2, the t1 is preferably 60 ℃, and the t2 is preferably 15 ℃, performing system adjustment, specifically as follows: a) detecting whether the running frequency of the compressor is the highest frequency allowed by a system, if not, controlling the compressor to increase the running frequency to the highest frequency according to a set speed V1, wherein V1 is preferably 0.5hz/s, if yes, opening a jet electronic expansion valve of the compressor to a set opening b, and b is preferably 60 steps; b) monitoring the exhaust temperature t3 and the exhaust superheat degree t4 of the compressor, and if the exhaust temperature t3 is higher than a set value t1 or the exhaust superheat degree t4 is higher than a set value t2, controlling the electronic jet expansion valve of the compressor to increase according to a set speed V2, wherein V2 is preferably (t3-t1) step/30 seconds or (t4-t2) step/30 seconds until the exhaust temperature t3 or the exhaust superheat degree t4 is stable, and maintaining the current opening.
The outdoor unit comprises a compressor, an oil separator, a one-way valve, a four-way valve, a gas-liquid separator, an oil return capillary tube, a heat exchanger, a liquid accumulator, a main expansion valve, an economizer and a fan, wherein the economizer, the main expansion valve, the liquid accumulator, the heat exchanger, the gas-liquid separator, the compressor, the oil separator and the one-way valve are sequentially arranged from one end of a refrigerant inlet of the outdoor unit to one end of a refrigerant outlet, the spaces between the heat exchanger and the gas-liquid separator and between the one-way valve and the refrigerant outlet of the outdoor unit are communicated through the four-way valve, the oil separator is connected with the inlet of the compressor through the oil return capillary tube, one path of outlet of the economizer is connected with the compressor, and the outdoor unit is provided with a system low-pressure sensor and a system high-pressure sensor.
Finally, it should be noted that the above-mentioned list is only the specific embodiment of the present invention. Obviously, the present invention is not limited to the above embodiments, and many modifications are possible. All modifications which can be derived or suggested by the person skilled in the art from the present disclosure are to be considered within the scope of the present invention.
Claims (6)
1. A control method for improving exhaust temperature at low ring temperature is characterized in that when a heating mode is started, if outdoor environment temperature is lower than a set value t0, low-temperature exhaust temperature control is started, and the method comprises the following specific steps: monitoring the exhaust temperature t3 and the exhaust superheat t4 of the compressor, and if the exhaust temperature t3 is lower than a set value t1 or the exhaust superheat t4 is lower than a set value t2, performing system adjustment, specifically as follows: a) detecting whether the running frequency of the compressor is the highest frequency allowed by a system, if not, controlling the compressor to increase the running frequency to the highest frequency according to a set speed V1, and if so, starting an electronic jet expansion valve of the compressor to a set opening b; b) and monitoring the exhaust temperature t3 and the exhaust superheat degree t4 of the compressor, and if the exhaust temperature t3 is higher than a set value t1 or the exhaust superheat degree t4 is higher than a set value t2, controlling the electronic jet expansion valve of the compressor to increase according to a set rate V2 until the exhaust temperature t3 or the exhaust superheat degree t4 is stable, and maintaining the current opening.
2. The method of claim 1, wherein t0 is 0 ℃.
3. The method as claimed in claim 1, wherein t1 is 60 ℃ and t2 is 15 ℃.
4. The method of claim 1, wherein V1 is 0.5 hz/s.
5. The method as claimed in claim 1, wherein b is 60 steps.
6. The control method for raising the exhaust gas temperature at a low ring temperature according to claim 1, wherein the V2 is (t3-t1) steps/30 seconds or (t4-t2) steps/30 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210263521.0A CN114719413A (en) | 2022-03-17 | 2022-03-17 | Control method for improving exhaust temperature at low ring temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210263521.0A CN114719413A (en) | 2022-03-17 | 2022-03-17 | Control method for improving exhaust temperature at low ring temperature |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114719413A true CN114719413A (en) | 2022-07-08 |
Family
ID=82238301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210263521.0A Pending CN114719413A (en) | 2022-03-17 | 2022-03-17 | Control method for improving exhaust temperature at low ring temperature |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114719413A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103471275A (en) * | 2013-08-30 | 2013-12-25 | 青岛海信日立空调系统有限公司 | Enhanced vapor injection air-conditioning circulating system and control method thereof |
| CN107178944A (en) * | 2017-07-13 | 2017-09-19 | 上海三菱电机·上菱空调机电器有限公司 | A kind of method for preventing that air conditioner discharge superheat is too small and air conditioner control system |
| CN108518892A (en) * | 2018-05-03 | 2018-09-11 | 中国科学院理化技术研究所 | Air supply control device based on air source heat pump system and control method thereof |
| CN109282545A (en) * | 2018-09-12 | 2019-01-29 | 宁波市海智普智能科技有限公司 | The Gas-supplying enthalpy-increasing control method of low form direct-current frequency conversion heat pump system |
| CN111238071A (en) * | 2020-01-07 | 2020-06-05 | 浙江中广电器股份有限公司 | Air conditioner and low-temperature heating method thereof |
-
2022
- 2022-03-17 CN CN202210263521.0A patent/CN114719413A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103471275A (en) * | 2013-08-30 | 2013-12-25 | 青岛海信日立空调系统有限公司 | Enhanced vapor injection air-conditioning circulating system and control method thereof |
| CN107178944A (en) * | 2017-07-13 | 2017-09-19 | 上海三菱电机·上菱空调机电器有限公司 | A kind of method for preventing that air conditioner discharge superheat is too small and air conditioner control system |
| CN108518892A (en) * | 2018-05-03 | 2018-09-11 | 中国科学院理化技术研究所 | Air supply control device based on air source heat pump system and control method thereof |
| CN109282545A (en) * | 2018-09-12 | 2019-01-29 | 宁波市海智普智能科技有限公司 | The Gas-supplying enthalpy-increasing control method of low form direct-current frequency conversion heat pump system |
| CN111238071A (en) * | 2020-01-07 | 2020-06-05 | 浙江中广电器股份有限公司 | Air conditioner and low-temperature heating method thereof |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220708 |
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| RJ01 | Rejection of invention patent application after publication |