CN111895689A - Refrigerating system supercooling degree device for improving wide temperature zone application - Google Patents
Refrigerating system supercooling degree device for improving wide temperature zone application Download PDFInfo
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- CN111895689A CN111895689A CN202010715371.3A CN202010715371A CN111895689A CN 111895689 A CN111895689 A CN 111895689A CN 202010715371 A CN202010715371 A CN 202010715371A CN 111895689 A CN111895689 A CN 111895689A
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- 238000004781 supercooling Methods 0.000 title claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 150
- 238000001816 cooling Methods 0.000 claims abstract description 55
- 239000003507 refrigerant Substances 0.000 claims abstract description 46
- 239000007788 liquid Substances 0.000 claims abstract description 22
- 238000001035 drying Methods 0.000 claims abstract description 13
- 230000007246 mechanism Effects 0.000 claims description 15
- 239000000498 cooling water Substances 0.000 claims description 5
- 238000005057 refrigeration Methods 0.000 description 13
- 238000000034 method Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 6
- 238000009833 condensation Methods 0.000 description 5
- 230000005494 condensation Effects 0.000 description 5
- 230000002238 attenuated effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000013526 supercooled liquid Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000007792 gaseous phase Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
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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
- F25B40/00—Subcoolers, desuperheaters or superheaters
- F25B40/02—Subcoolers
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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
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/42—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger characterised by the use of the condensate, e.g. for enhanced cooling
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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
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/22—Means for preventing condensation or evacuating condensate
- F24F13/222—Means for preventing condensation or evacuating condensate for evacuating condensate
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/22—Means for preventing condensation or evacuating condensate
- F24F2013/228—Treatment of condensate, e.g. sterilising
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a device for improving the super-cooling degree of a refrigerating system applied in a wide temperature area, wherein a water outlet of a condensed water receiving tray is connected with a water inlet of a condensed water collecting tank, and a water outlet of the condensed water collecting tank is connected with a three-way electromagnetic valve; the water outlet of the cooling tower is connected with the three-way electromagnetic valve, and the water inlet of the water pump is connected with the three-way electromagnetic valve; the water inlet of the water-cooling subcooler is connected with the water outlet of the water pump, and the water outlet of the water-cooling subcooler is connected with the water return port of the cooling tower; the refrigerant inlet of the water-cooling subcooler is connected with the refrigerant outlet of the condenser, the refrigerant outlet of the water-cooling subcooler is connected with the inlet of the drying filter, the inlet of the expansion valve is connected with the outlet of the drying filter, the outlet of the expansion valve is connected with the inlet of the evaporator, the inlet of the gas-liquid separator is connected with the outlet of the evaporator, the outlet of the gas-liquid separator is connected with the air inlet of the compressor, and the air outlet of the compressor is connected with the inlet of the condenser. The invention can provide continuous supercooling degree for the refrigerating system and ensure the refrigerating capacity of the refrigerating system and the stable operation of the whole system.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a device for improving the supercooling degree of a refrigerating system applied to a wide temperature zone.
Background
In the condensation process of the refrigerant in the vapor compression refrigeration system, heat is released from a heat exchanger device (condenser) and a heat exchange medium (usually air, water and the like) to change a high-temperature gaseous refrigerant into a liquid refrigerant with reduced temperature, and before the refrigerant enters a throttling element (usually an expansion valve, a capillary tube and the like), the liquid refrigerant is cooled to a state lower than the condensation temperature, which is called supercooling, and the difference between the liquid refrigerant and the condensation temperature is the supercooling degree. Through the analysis of the pressure-enthalpy diagram of the refrigerant, when the degree of supercooling is larger, the refrigerating capacity of the refrigerating system is larger, and the refrigerating performance coefficient is also larger. In addition, the liquid refrigerant has certain supercooling degree, so that the liquid refrigerant is prevented from being in a gas-liquid two-phase state before entering the throttling element, and the throttling element works more stably.
In order to obtain larger supercooling degree of the existing air conditioner, the cost is relatively higher by generally increasing the heat exchange area of a condenser or increasing the air volume or water volume of a condensing medium. Particularly, under the use environment of a wide temperature area such as a high-temperature environment, a complex weather environment or an operation environment, the supercooling degree of the refrigerant cannot be effectively guaranteed, so that the refrigerating capacity and the performance coefficient of the air conditioner cannot be effectively guaranteed, and the stable operation of the air conditioner is greatly influenced.
In the process of refrigerating the air conditioner, condensed water is generated when indoor air passes through the evaporator. Taking the air conditioner for refrigerating a room as an example, tests show that when the indoor air temperature is 24-28 ℃, the temperature of condensed water generated by an evaporator is about 11-13 ℃, and the temperature of the condensed water is significantly lower than the air temperature and is lower than the condensation temperature (40-45 ℃) of a refrigerant. However, the condensed water is usually discharged to the outside directly through a pipeline and is not utilized well, which causes a certain waste of electric energy, refrigerating capacity and water resource.
When the air conditioner is used for refrigeration in a wide temperature area environment represented by a high-temperature environment, the environment temperature is high, the heat exchange capacity between the refrigerant in the condenser of the refrigeration system and air is obviously reduced, the liquid refrigerant cannot be supercooled, compared with the operation under a standard working condition, the refrigeration capacity and the refrigeration coefficient are obviously attenuated, the exhaust temperature of the compressor is greatly increased, the operation current is obviously increased, and the power consumption is increased. When the air conditioner is used for refrigeration in a drier environment, the absolute moisture content in the air is lower, the generated condensed water amount is also lower, the sufficient and continuous supercooling degree is not provided, and only methods of increasing the area of a condenser or increasing the circulating air volume of the condenser and the like are adopted, and all the methods need to consume certain materials and electric energy.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a device for improving the supercooling degree of a refrigerating system applied in a wide temperature zone, which provides continuous supercooling degree for the refrigerating system and ensures the refrigerating capacity of the refrigerating system and the stable operation of the whole system.
The invention provides a device for improving the supercooling degree of a refrigerating system applied to a wide temperature area, which comprises a water circulation mechanism and a refrigerating mechanism, wherein the water circulation mechanism is connected with the refrigerating mechanism; wherein:
the water circulation mechanism comprises an evaporator, a condensed water receiving tray, a condensed water collecting tank, a cooling tower, a three-way electromagnetic valve, a water pump and a water-cooling subcooler; the condensed water receiving tray is arranged at the bottom end of the evaporator and is used for collecting condensed water formed on the surface of the evaporator, the water outlet of the condensed water receiving tray is connected with the water inlet of the condensed water collecting tank through a pipeline, and the water outlet of the condensed water collecting tank is connected with the first through of the three-way electromagnetic valve through a pipeline; the water outlet of the cooling tower is connected with the second port of the three-way electromagnetic valve through a pipeline, and the water inlet of the water pump is connected with the third port of the three-way electromagnetic valve through a pipeline; the water inlet of the water-cooling subcooler is connected with the water outlet of the water pump through a pipeline, and the water outlet of the water-cooling subcooler is connected with the water return port of the cooling tower through a pipeline;
the refrigerating mechanism comprises a compressor, a condenser, a drying filter, an expansion valve and a gas-liquid separator; the refrigerant outlet of the condenser is connected with the refrigerant inlet of the water-cooling subcooler through a pipeline, the refrigerant outlet of the water-cooling subcooler is connected with the inlet of the drying filter through a pipeline, the outlet of the drying filter is connected with the inlet of the expansion valve through a pipeline, the outlet of the expansion valve is connected with the inlet of the evaporator through a pipeline, the outlet of the evaporator is connected with the inlet of the gas-liquid separator through a pipeline, the outlet of the gas-liquid separator is connected with the air inlet of the compressor through a pipeline, and the air outlet of the compressor is connected with the inlet of the condenser through a.
Preferably, the system also comprises a controller, wherein the controller is electrically connected with the three-way electromagnetic valve, the water pump, the water-cooling subcooler, the compressor and the expansion valve and controls the three-way electromagnetic valve, the water pump, the water-cooling subcooler, the compressor and the expansion valve to work.
Preferably, a liquid level sensor is installed on the condensed water collecting tank.
Preferably, a temperature sensor is installed on a connecting pipeline between the drying filter and the water-cooling subcooler.
Preferably, the flow direction of the refrigerator in the water-cooled subcooler is opposite to the flow direction of the cooling water therein.
The device for improving the supercooling degree of the refrigerating system applied to the wide temperature area, provided by the invention, has the advantages that condensed water generated in the working process of the refrigerating system is recovered and stored, and is used for improving the supercooling degree of a refrigerant according to the requirement, so that the refrigerating capacity of the refrigerating system is increased; when the amount of condensed water is not enough to maintain the sufficient supercooling degree of the refrigerating system, the cooling water in the cooling tower can be used, the supercooling degree of the refrigerant is improved, and the refrigerating capacity and the refrigerating efficiency of the refrigerating system are increased. Particularly, in the refrigeration system which operates in a wide temperature area, when the ambient temperature is too high, the air-cooled condenser cannot generate the supercooling degree, the condensing pressure rises, the refrigerating capacity is attenuated, and the energy consumption of the compressor rises, the related device and the control method provided by the invention can stably generate the supercooling degree, improve the refrigerating capacity and the refrigerating efficiency of the system, have simple structure, are convenient to install, have low manufacturing and operating costs, and are suitable for the air conditioner application in the wide temperature area.
Drawings
Fig. 1 is a schematic structural diagram of a device for increasing the supercooling degree of a refrigeration system applied to a wide temperature zone, which is provided by the invention.
Detailed Description
Referring to fig. 1, the invention provides a device for improving the supercooling degree of a refrigerating system applied to a wide temperature area, which comprises a water circulation mechanism, a refrigerating mechanism and a controller; wherein:
the water circulation mechanism comprises an evaporator 1, a condensed water receiving tray 2, a condensed water collecting tank 3, a cooling tower 4, a three-way electromagnetic valve 5, a water pump 6 and a water-cooling subcooler 7. The condensed water collecting tray 2 is installed at the bottom end of the evaporator 1 and used for collecting condensed water formed on the surface of the evaporator 1, a water outlet of the condensed water collecting tray 2 is connected with a water inlet of the condensed water collecting tank 3 through a pipeline, the condensed water collecting tank 3 is used for storing the condensed water and a liquid level sensor 14 is installed on the condensed water collecting tank 3, and a water outlet of the condensed water collecting tank 3 is connected with a first channel of the three-way electromagnetic valve 5 through a pipeline. A water outlet of the cooling tower 4 is connected with a second port of the three-way electromagnetic valve 5 through a pipeline, and a water inlet of the water pump 6 is connected with a third port of the three-way electromagnetic valve 5 through a pipeline; the water inlet of the water-cooling subcooler 7 is connected with the water outlet of the water pump 6 through a pipeline, and the water outlet of the water-cooling subcooler 7 is connected with the water return port of the cooling tower 4 through a pipeline.
The refrigeration mechanism includes a compressor 8, a condenser 9, a dry filter 10, an evaporator 1, an expansion valve 11, and a gas-liquid separator 12. The refrigerant outlet of the condenser 9 is connected with the refrigerant inlet of the water-cooling subcooler 7 through a pipeline, the refrigerant outlet of the water-cooling subcooler 7 is connected with the inlet of the drying filter 10 through a pipeline, and the flowing direction of the refrigerating machine in the water-cooling subcooler 7 is opposite to the flowing direction of the cooling water in the refrigerating machine. A temperature sensor 15 is arranged on a connecting pipeline between the drying filter 10 and the water-cooling subcooler 7, the outlet of the drying filter 10 is connected with the inlet of the expansion valve 11 through a pipeline, the outlet of the expansion valve 11 is connected with the inlet of the evaporator 1 through a pipeline, the outlet of the evaporator 1 is connected with the inlet of the gas-liquid separator 12 through a pipeline, the outlet of the gas-liquid separator 12 is connected with the air inlet of the compressor 8 through a pipeline, and the exhaust port of the compressor 8 is connected with the inlet connector of the condenser 9 through a pipeline.
The controller 13 is electrically connected with the three-way electromagnetic valve 5, the water pump 6, the water-cooling subcooler 7, the compressor 8 and the expansion valve 11 and controls the start and stop of the three-way electromagnetic valve 5, the water pump 6, the water-cooling subcooler 7, the compressor 8 and the expansion valve 11 and adjusts the running state.
The working process of the invention is as follows:
when the refrigeration mechanism operates, the condensed water formed on the surface of the fins of the evaporator 1 flows into the condensed water receiving tray 2 under the action of gravity and is collected into the condensed water collecting tank 3 through a pipeline. The controller 13 detects the refrigerant temperature of the refrigerant outlet pipe of the water-cooled subcooler 7 through the temperature sensor 15;
1. when the refrigerating system works under the working condition (35 ℃ specified in T2 working condition defined in GB/T7725-2016 room air conditioner) not higher than the standard working condition, the high-temperature and high-pressure gaseous refrigerant releases heat and condenses in the condenser 9, a condensing fan (according to the design requirement of the refrigerating system) of the condenser 9 provides enough air volume to take away the condensation heat released by the refrigerant, the refrigerant changes from gaseous phase to liquid phase and obtains a certain supercooling degree to be supercooled liquid, and at the moment, the water-cooled subcooler 7 is not needed to be used for cooling the refrigerant to obtain the supercooling degree, so that the water pump 6 is not needed to be started to use the condensed water of the condensed water collecting tank 3;
in the operation process of the refrigeration system, condensate water is continuously generated and continuously collected to the condensate water collecting tank 3, when a water level sensor 14 arranged on the condensate water collecting tank 3 detects that the condensate water reaches a high water level, a first passage and a third passage of the three-way electromagnetic valve 5 are opened, a second passage is closed, the water pump 6 is then opened, the condensate water stored in the condensate water collecting tank 3 is directly conveyed to a water tank of the cooling tower 4 through the water-cooling subcooler 7 and each water pipeline for storage, so that the storage space of the condensate water collecting tank 3 is emptied, and the newly generated condensate water can be continuously collected.
2. When the refrigeration system works in a working condition higher than a standard working condition (such as 35 ℃ specified in T2 working condition defined in GB/T7725-2016 room air conditioner), a high-temperature and high-pressure refrigerant releases heat and condenses in the condenser 9, and as the ambient temperature is high, although a condensing fan of the condenser 9 can provide enough air volume, the heat exchange temperature difference is reduced, the refrigerant cannot be ensured to be completely changed into liquid from gaseous state, and obtain enough supercooling degree to be supercooled liquid, and at the moment, the water-cooling subcooler 7 is used for cooling the refrigerant to obtain the supercooling degree;
the specific control process is as follows: when the controller 13 detects that the temperature of the refrigerant at the refrigerant outlet pipe of the water-cooling subcooler 7 is higher than the temperature value set by the control software (the temperature value is set by selecting a proper superheat value according to the type of the refrigerant used), the first and third ways of the three-way electromagnetic valve 5 are opened, the second way is closed, the water pump 6 is then opened, the condensed water stored in the condensed water collecting tank 3 is input into the water-cooling subcooler 7 through each water pipeline, and the refrigerant in the water-cooling subcooler 7 is cooled; the condensate water with lower temperature can further condense the refrigerant and obtain enough supercooling degree; the temperature of the condensed water rises after absorbing the heat of the refrigerant in the water-cooling subcooler 7, the condensed water is delivered to the cooling tower 4 through a water pipeline after coming out of a water outlet of the water-cooling subcooler 7, and the condensed water is stored and cooled in a water tank of the cooling tower 4;
when the condensed water stored in the condensed water collecting tank 3 is continuously used and the newly generated condensed water is not enough to be supplemented, the water level is continuously reduced, when a water level sensor 14 arranged on the condensed water collecting tank 3 detects that the condensed water reaches a low water level, a second passage and a third passage of a three-way electromagnetic valve 5 are opened and a first passage is closed, the water pump 6 is switched to extract the condensed water stored in a water tank in the cooling tower 4 and conveys the condensed water to a water-cooling subcooler 7 to cool the refrigerant, so that the refrigerant continuously obtains enough supercooling degree;
when the accumulated condensed water in the condensed water collecting tank 3 reaches the high water level again, the first passage and the third passage of the three-way electromagnetic valve 5 are opened again, the second passage is closed, the water pump 6 is switched to extract the condensed water in the condensed water collecting tank 3, and the steps are repeated.
The invention recovers and stores the condensed water generated in the working of the refrigerating system, and uses the condensed water for improving the supercooling degree of the refrigerant according to the requirement, thereby increasing the refrigerating capacity of the refrigerating system; when the amount of condensed water is not enough to maintain the sufficient supercooling degree of the refrigerating system, the cooling water in the cooling tower 4 can be used to improve the supercooling degree of the refrigerant and increase the refrigerating capacity and the refrigerating efficiency of the refrigerating system. Particularly, in the refrigeration system which operates in a wide temperature area, when the ambient temperature is too high, the air-cooled condenser cannot generate the supercooling degree, the condensing pressure rises, the refrigerating capacity is attenuated, and the energy consumption of the compressor rises, the related device and the control method provided by the invention can stably generate the supercooling degree, improve the refrigerating capacity and the refrigerating efficiency of the system, have simple structure, are convenient to install, have low manufacturing and operating costs, and are suitable for the air conditioner application in the wide temperature area.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. A device for improving the super-cooling degree of a refrigerating system applied in a wide temperature area is characterized by comprising a water circulation mechanism and a refrigerating mechanism; wherein:
the water circulation mechanism comprises an evaporator (1), a condensed water receiving tray (2), a condensed water collecting tank (3), a cooling tower (4), a three-way electromagnetic valve (5), a water pump (6) and a water-cooling subcooler (7); the condensed water receiving tray (2) is arranged at the bottom end of the evaporator (1) and is used for collecting condensed water formed on the surface of the evaporator (1), a water outlet of the condensed water receiving tray (2) is connected with a water inlet of the condensed water collecting tank (3) through a pipeline, and a water outlet of the condensed water collecting tank (3) is connected with a first through of the three-way electromagnetic valve (5) through a pipeline; a water outlet of the cooling tower (4) is connected with a second port of the three-way electromagnetic valve (5) through a pipeline, and a water inlet of the water pump (6) is connected with a third port of the three-way electromagnetic valve (5) through a pipeline; the water inlet of the water-cooling subcooler (7) is connected with the water outlet of the water pump (6) through a pipeline, and the water outlet of the water-cooling subcooler is connected with the water return port of the cooling tower (4) through a pipeline;
the refrigerating mechanism comprises a compressor (8), a condenser (9), a drying filter (10), an expansion valve (11) and a gas-liquid separator (12); the refrigerant outlet of the condenser (9) is connected with the refrigerant inlet of the water-cooling subcooler (7) through a pipeline, the refrigerant outlet of the water-cooling subcooler (7) is connected with the inlet of the drying filter (10) through a pipeline, the outlet of the drying filter (10) is connected with the inlet of the expansion valve (11) through a pipeline, the outlet of the expansion valve (11) is connected with the inlet of the evaporator (1) through a pipeline, the outlet of the evaporator (1) is connected with the inlet of the gas-liquid separator (12) through a pipeline, the outlet of the gas-liquid separator (12) is connected with the air inlet of the compressor (8) through a pipeline, and the air outlet of the compressor (8) is connected with the inlet of the condenser (9) through a.
2. The device for improving the supercooling degree of the refrigerating system applied to the wide temperature zone according to claim 1, further comprising a controller (13), wherein the controller (13) is electrically connected with the three-way electromagnetic valve (5), the water pump (6), the water-cooling subcooler (7), the compressor (8) and the expansion valve (11) and controls the three-way electromagnetic valve (5), the water pump (6), the water-cooling subcooler (7), the compressor (8) and the expansion valve (11) to work.
3. The apparatus for increasing the supercooling degree of a refrigerating system for a wide temperature range application according to claim 1, wherein a liquid level sensor (14) is installed on the condensate water collecting tank (3).
4. The apparatus for increasing the supercooling degree of a refrigerating system for a wide temperature range application according to any one of claims 1 to 3, wherein a temperature sensor (15) is installed on a connecting pipeline between the drying filter (10) and the water-cooled subcooler (7).
5. The apparatus for increasing the supercooling degree of a refrigerating system for a wide temperature range according to any one of claims 1 to 3, wherein the flow direction of the refrigerating machine in the water-cooled subcooler (7) is opposite to the flow direction of the cooling water therein.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010715371.3A CN111895689A (en) | 2020-07-23 | 2020-07-23 | Refrigerating system supercooling degree device for improving wide temperature zone application |
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| CN202010715371.3A CN111895689A (en) | 2020-07-23 | 2020-07-23 | Refrigerating system supercooling degree device for improving wide temperature zone application |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112781214A (en) * | 2021-02-08 | 2021-05-11 | 深圳市励科机电科技工程有限公司 | Building central air conditioning system based on condensate water recycling and control method thereof |
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| CN112781214A (en) * | 2021-02-08 | 2021-05-11 | 深圳市励科机电科技工程有限公司 | Building central air conditioning system based on condensate water recycling and control method thereof |
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