CN107014096A - A kind of technical cooling under pole low temperature environment is with air-cooled single cooler group - Google Patents
A kind of technical cooling under pole low temperature environment is with air-cooled single cooler group Download PDFInfo
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- CN107014096A CN107014096A CN201710379982.3A CN201710379982A CN107014096A CN 107014096 A CN107014096 A CN 107014096A CN 201710379982 A CN201710379982 A CN 201710379982A CN 107014096 A CN107014096 A CN 107014096A
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- pressure
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- unit
- storage device
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- 238000001816 cooling Methods 0.000 title claims abstract description 47
- 239000007788 liquid Substances 0.000 claims abstract description 58
- 239000003507 refrigerant Substances 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims description 28
- 238000005057 refrigeration Methods 0.000 claims description 8
- 238000010977 unit operation Methods 0.000 claims description 6
- OHMHBGPWCHTMQE-UHFFFAOYSA-N 2,2-dichloro-1,1,1-trifluoroethane Chemical group FC(F)(F)C(Cl)Cl OHMHBGPWCHTMQE-UHFFFAOYSA-N 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 230000005494 condensation Effects 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
-
- 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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/006—Accumulators
-
- 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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- 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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/01—Heaters
-
- 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
- F25B2700/19—Pressures
- F25B2700/195—Pressures of the condenser
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention discloses the technical cooling under a kind of pole low temperature environment air-cooled single cooler group, including compressor, wind side condenser, expansion valve, water side evaporator, reservoir, electric heater, pressure switch and pressure sensor.The volume of reservoir has liquid refrigerant in being more than the volume of the coil pipe of wind side condenser simultaneously；The exhaust side of compressor is sequentially connected the suction side of wind side condenser, reservoir, expansion valve, water side evaporator and compressor；Electric heater is arranged on the surface of reservoir；Pressure switch is connected electrically on electric heater and is connected with reservoir signal；Connected between the exhaust side and reservoir of compressor on a pipeline, the pipeline and a check valve is installed；Pressure sensor is arranged between the downstream of the exhaust side of compressor and wind side condenser.The technical cooling of the present invention normally can be started and be run in the environment of temperature as little as 30 DEG C with air-cooled single cooler group.
Description
Technical Field
The invention relates to an air-cooled single cooling unit for process cooling in an extremely low temperature environment.
Background
A conventional air-cooled single-cooling unit is a refrigeration circuit formed by a compressor 1, a wind-side condenser 2, an expansion valve 3, a water-side evaporator 4, and the compressor 1 (see fig. 1). High-temperature gas of a refrigerant discharged by the compressor 1 is condensed into liquid in the wind-side condenser 2, is throttled and depressurized by the throttling device, enters the water-side evaporator 3, absorbs heat, evaporates and returns to the compressor 1, and a refrigeration cycle is completed. The air cooling unit for cooling the process in the production and manufacturing process needs chilled water which enters at 12 ℃ and exits at 7 ℃ all the year round and is used for cooling the process. For areas with extremely low ambient temperatures, such as the northern areas of china, where the outdoor temperature is as low as about-30 ℃ in winter, or even lower, indoor production equipment often requires process cooling. In such an environment, normal operation of the conventional air-cooled single-cooling unit is impossible. When the conventional air-cooling single-cooling unit is applied to the environment, two problems can occur:
1. when the ambient temperature is extremely low (-30 ℃), the compressor starts to operate immediately after the unit is started, the low-pressure alarm of the unit appears very quickly, and if the unit is started repeatedly for many times, the motor of the compressor can be burnt. The reason is that the outdoor environment temperature is extremely low, the pressure in the condenser coil is very low, after the compressor is started, the high-temperature gaseous refrigerant discharged into the condenser coil is quickly condensed into liquid, and the condensing pressure cannot rise, so that the refrigerant cannot normally and continuously enter the evaporator through the expansion valve; however, the compressor still continuously sucks the refrigerant from the evaporator, so that the low-pressure side pressure of the water side evaporator is quickly reduced, the low-pressure alarm of the unit is caused, and the unit cannot be started normally.
2. After the unit is normally started, although the condensing temperature of the wind side is controlled by reducing the running number of fans on the wind side condenser or reducing the rotating speed of the fans, under the condition that the outdoor environment temperature is very low, even if all the fans are stopped, the required condensing pressure is still out of control, so that the low-pressure alarm of the unit is caused, and the unit cannot normally run.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an air-cooled single cooling unit for process cooling in an extremely low temperature environment, which can be normally started and operated in an environment with the temperature as low as-30 ℃.
One technical scheme for achieving the aim of the invention is as follows: an air-cooled single-cooling unit for process cooling in an extremely low temperature environment comprises a compressor, an air side condenser, an expansion valve, a water side evaporator, a liquid storage device, an electric heater, a pressure switch and a pressure sensor; wherein,
the volume of the liquid accumulator is larger than that of a coil pipe of the wind side condenser, and liquid refrigerant is stored in the liquid accumulator;
the exhaust side of the compressor is connected with the upstream of a coil pipe of the air side condenser, the downstream of the coil pipe of the air side condenser is connected with the inlet of the liquid storage device, the outlet of the liquid storage device is connected with the inlet of the expansion valve, the outlet of the expansion valve is connected with the inlet of the water side evaporator, and the outlet of the water side evaporator is connected with the suction side of the compressor;
the electric heater is mounted on the surface of the liquid reservoir;
the pressure switch is electrically connected to the electric heater and is in signal connection with the liquid storage device;
a pipeline is connected between the exhaust side of the compressor and the liquid reservoir, and a one-way valve is installed on the pipeline;
the pressure sensor is disposed between a discharge side of the compressor and downstream of the wind-side condenser.
The air-cooled single cooling unit for process cooling in the extremely low temperature environment comprises a coil pipe and a plurality of fans which are arranged beside the coil pipe and controlled by a variable frequency controller.
The air-cooled single cooling unit for process cooling in the extremely low temperature environment is characterized in that a pressure gauge is further connected between the pressure switch and the liquid storage device.
The air-cooled single cooling unit for process cooling in the extremely low temperature environment is characterized in that the liquid refrigerant is hydrochlorofluorocarbon or hydrofluorocarbon.
The other technical scheme for realizing the aim of the invention is as follows: the invention relates to an operation method of an air-cooled single cooling unit for process cooling in an extremely low temperature environment, which is implemented in the air-cooled single cooling unit for process cooling in the extremely low temperature environment and comprises a unit starting step and a unit operation step; wherein,
when the unit starting step is carried out, the electric heater is started through the pressure switch, so that the pressure in the liquid storage device is increased, and when the pressure in the liquid storage device is increased to a set value, the electric heater is closed through the pressure switch; raising the condensing pressure sufficient to circulate the refrigerant in the refrigeration circuit of the unit and rapidly passing through the expansion valve into the water side evaporator to normally start the compressor;
when the unit operation step is carried out, the condensing pressure is measured through a pressure sensor, and when the ambient temperature is lower than minus 30 ℃ and the condensing pressure is smaller than a set value, the condensing pressure is increased by reducing the number of fans for starting a wind side condenser or reducing the rotating speed of the fans until all the fans are stopped;
if the condensing pressure is still smaller than the set value, the one-way valve is opened, the high-temperature and high-pressure airflow at the exhaust side of the compressor is introduced into the liquid storage device, the pressure in the liquid storage device is maintained at the set value, the inlet pressure of the expansion valve is further larger than the outlet pressure, a certain pressure difference is formed, the refrigerant in the refrigeration loop of the unit flows in a circulating mode, and enters the water side evaporator through the expansion valve, and the unit can run normally.
The air-cooled single cooling unit for process cooling in the extremely low temperature environment has the following characteristics: a liquid storage device with the volume larger than that of a condenser coil of the wind side condenser is arranged between the downstream of the coil of the wind side condenser and an expansion valve, and an electric heater is arranged on the liquid storage device, so that the pressure in the liquid storage device is increased, the pressure is enough to push a refrigerant to rapidly pass through the expansion valve to enter a water side evaporator and a suction side of a compressor, the condensation pressure is kept not to be reduced, and the unit can be normally started and operated in an environment with the temperature as low as minus 30 ℃. In addition, a pipeline provided with a one-way valve is connected between the exhaust side of the compressor and the liquid storage device, if the unit is in operation and the pressure in the wind side condenser is still low, the one-way valve is opened to lead high-temperature and high-pressure airflow from the exhaust side of the compressor into the liquid storage device so as to maintain the pressure in the liquid storage device, and the inlet pressure of the expansion valve is greater than the outlet pressure to form a certain pressure difference, so that the unit can normally operate in an environment with the temperature as low as minus 30 ℃.
Drawings
FIG. 1 is a schematic structural diagram of a prior art air-cooled chiller unit;
fig. 2 is a schematic structural view of an air-cooled single chiller unit for process cooling in a very low temperature environment according to the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
Referring to fig. 2, the air-cooled single chiller unit for process cooling in a very low temperature environment of the present invention includes a compressor 1, an air-side condenser 2, an expansion valve 3, a water-side evaporator 4, a liquid reservoir 5, an electric heater 6, a pressure switch 7, a check valve 8, and a pressure sensor 10; wherein:
the wind side condenser 2 comprises a coil 21 and a plurality of fans 22 which are arranged beside the coil 21 and controlled by a variable frequency controller;
the accumulator 5 has a volume greater than the volume of the condenser coil 21 of the wind side condenser 2 and contains liquid refrigerant; the liquid refrigerant is hydrochlorofluorocarbon or hydrofluorocarbon, specifically including R134a, R22, R407C, R410A, R32;
the exhaust side of the compressor 1 is connected with the upstream of a condenser coil 21 of the wind-side condenser 2, the downstream of the condenser coil 21 is connected with the inlet of an accumulator 5, the outlet of the accumulator 5 is connected with the inlet of an expansion valve 3, the outlet of the expansion valve 3 is connected with the inlet of a water-side evaporator 4, and the outlet of the water-side evaporator 4 is connected with the suction side of the compressor 1;
the electric heater 6 is arranged on the surface of the liquid reservoir 6;
the pressure switch 7 is electrically connected on the electric heater 6 and is in signal connection with the liquid storage device 5; a pressure gauge 9 is also connected between the pressure switch 7 and the liquid reservoir 5;
a pipeline is connected between the exhaust side of the compressor 1 and the liquid accumulator 5, and the one-way valve 8 is installed on the pipeline;
the pressure sensor 10 is disposed between the discharge side of the compressor 1 and the downstream of the wind-side condenser 2.
The operation method of the air-cooled single cooling unit for process cooling in the extremely low temperature environment is executed in the air-cooled single cooling unit for process cooling in the extremely low temperature environment and comprises a unit starting step and a unit operation step; wherein,
when the unit starting step is carried out, the electric heater 6 is started through the pressure switch 7, so that the pressure in the liquid storage device 5 is increased, and when the pressure in the liquid storage device 5 is increased to a set value, the electric heater 6 is closed through the pressure switch 7; the pressure in the accumulator 5 raises the condensation pressure, which is sufficient to circulate the refrigerant in the refrigeration circuit of the unit and to pass rapidly through the expansion valve 3 into the water-side evaporator 4, causing the compressor to start normally;
when the unit operation step is carried out, the condensing pressure is measured through the pressure sensor 10, when the ambient temperature is reduced to minus 30 ℃, the condensing pressure is smaller than a set value, the condensing pressure is increased by reducing the number of the fans 22 for starting the wind side condenser 2 or reducing the rotating speed of the fans 22 until all the fans 22 are stopped; if the condensing pressure is still less than the set value, the one-way valve 8 is opened, that is, the wind-side condenser 2 is stopped, the high-temperature and high-pressure air flow at the exhaust side of the compressor 1 is introduced into the liquid storage device 5, the pressure in the liquid storage device 5 is maintained at the set value, further, the inlet pressure of the expansion valve 3 is greater than the outlet pressure and forms a certain pressure difference, the refrigerant in the refrigeration loop of the unit circularly flows and enters the water-side evaporator 4 through the expansion valve 3, and the unit can normally operate.
The air-cooled single cooling unit for process cooling in the extremely low temperature environment has the following characteristics: by connecting a liquid storage device between the downstream of the coil of the wind side condenser and the expansion valve, in order to ensure that liquid refrigerant still exists in the liquid storage device under the condition of extremely low ambient temperature (-30 ℃), the volume of the liquid storage device is larger than that of the coil of the condenser, and an electric heater is arranged on the liquid storage device, so that the pressure in the liquid storage device is increased, the pressure is enough to push the refrigerant to rapidly pass through the expansion valve to enter the suction side of the water side evaporator and the compressor, thereby keeping the condensation pressure not to be reduced, and ensuring that the unit can be normally started and operated under the environment with the temperature as low as-30 ℃. In addition, a pipeline provided with a one-way valve is connected between the exhaust side of the compressor and the liquid storage device, if the unit is in operation and the pressure in the wind side condenser is still low, the one-way valve is opened, high-temperature and high-pressure airflow at the exhaust side of the compressor is led into the liquid storage device to maintain the pressure in the liquid storage device, and the inlet pressure of the expansion valve is greater than the outlet pressure to form a certain pressure difference, so that the unit can normally operate in an environment with the temperature as low as minus 30 ℃.
The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should also fall within the scope of the present invention, and should be defined by the claims.
Claims (5)
1. An air-cooled single-cooling unit for process cooling in an extremely low temperature environment comprises a compressor, an air-side condenser, an expansion valve, a water-side evaporator, a liquid storage device, an electric heater, a pressure switch and a pressure sensor, wherein the air-cooled single-cooling unit comprises a compressor, an air-side condenser, an expansion valve and a water-side evaporator;
the volume of the liquid accumulator is larger than that of a coil pipe of the wind side condenser, and liquid refrigerant is stored in the liquid accumulator;
the exhaust side of the compressor is connected with the upstream of a coil pipe of the air side condenser, the downstream of the coil pipe of the air side condenser is connected with the inlet of the liquid storage device, the outlet of the liquid storage device is connected with the inlet of the expansion valve, the outlet of the expansion valve is connected with the inlet of the water side evaporator, and the outlet of the water side evaporator is connected with the suction side of the compressor;
the electric heater is mounted on the surface of the liquid reservoir;
the pressure switch is electrically connected to the electric heater and is in signal connection with the liquid storage device;
a pipeline is connected between the exhaust side of the compressor and the liquid reservoir, and a one-way valve is installed on the pipeline;
the pressure sensor is disposed between a discharge side of the compressor and downstream of the wind-side condenser.
2. An air-cooled chiller unit for process cooling in very low temperature environments according to claim 1 wherein the air side condenser comprises a coil and a plurality of fans mounted beside the coil and controlled by a variable frequency controller.
3. An air-cooled chiller unit for process cooling in very low temperature environments according to claim 1, wherein a pressure gauge is further connected between the pressure switch and the reservoir.
4. The air-cooled chiller unit for cooling a process in a very low temperature environment according to claim 1, wherein the liquid refrigerant is a hydrochlorofluorocarbon or a hydrofluorocarbon.
5. An operation method of an air-cooled single chiller unit for process cooling in an extremely low temperature environment, which is implemented in the air-cooled single chiller unit for process cooling in an extremely low temperature environment according to claim 1, and is characterized in that the operation method comprises a unit starting step and a unit operation step;
when the unit starting step is carried out, the electric heater is started through the pressure switch, so that the pressure in the liquid storage device is increased, and when the pressure in the liquid storage device is increased to a set value, the electric heater is closed through the pressure switch; raising the condensing pressure sufficient to circulate the refrigerant in the refrigeration circuit of the unit and rapidly passing through the expansion valve into the water side evaporator to normally start the compressor;
when the unit operation step is carried out, the condensing pressure is measured through a pressure sensor, and when the ambient temperature is lower than minus 30 ℃ and the condensing pressure is smaller than a set value, the condensing pressure is increased by reducing the number of fans for starting a wind side condenser or reducing the rotating speed of the fans until all the fans are stopped;
if the condensing pressure is still smaller than the set value, the one-way valve is opened, the high-temperature and high-pressure airflow at the exhaust side of the compressor is introduced into the liquid storage device, the pressure in the liquid storage device is maintained at the set value, the inlet pressure of the expansion valve is further larger than the outlet pressure, a certain pressure difference is formed, the refrigerant in the refrigeration loop of the unit flows in a circulating mode, and enters the water side evaporator through the expansion valve, and the unit can run normally.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710379982.3A CN107014096A (en) | 2017-05-25 | 2017-05-25 | A kind of technical cooling under pole low temperature environment is with air-cooled single cooler group |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710379982.3A CN107014096A (en) | 2017-05-25 | 2017-05-25 | A kind of technical cooling under pole low temperature environment is with air-cooled single cooler group |
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| CN107014096A true CN107014096A (en) | 2017-08-04 |
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| CN201710379982.3A Pending CN107014096A (en) | 2017-05-25 | 2017-05-25 | A kind of technical cooling under pole low temperature environment is with air-cooled single cooler group |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111550940A (en) * | 2020-05-16 | 2020-08-18 | 王咏伦 | Screw refrigerating unit in low-temperature environment and starting method thereof |
| CN112880123A (en) * | 2019-11-29 | 2021-06-01 | 青岛海尔空调电子有限公司 | Compressor cooling device of air conditioner and control method thereof |
| CN114353361A (en) * | 2022-01-07 | 2022-04-15 | 青岛海尔空调电子有限公司 | Method and device for controlling refrigeration and freezing unit and refrigeration and freezing unit |
| CN114777292A (en) * | 2022-04-26 | 2022-07-22 | 青岛海尔空调电子有限公司 | A kind of air conditioning system and control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH10115475A (en) * | 1996-10-09 | 1998-05-06 | Aisin Seiki Co Ltd | Cooling water device |
| CN2804693Y (en) * | 2005-07-01 | 2006-08-09 | 中国人民解放军96531部队 | Constant temp dehumidifier |
| CN101788214A (en) * | 2009-12-18 | 2010-07-28 | 艾默生网络能源有限公司 | Air conditioning condenser |
| CN206755641U (en) * | 2017-05-25 | 2017-12-15 | 克莱门特捷联制冷设备(上海)有限公司 | A kind of air-cooled single cooler group of technical cooling under pole low temperature environment |
-
2017
- 2017-05-25 CN CN201710379982.3A patent/CN107014096A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10115475A (en) * | 1996-10-09 | 1998-05-06 | Aisin Seiki Co Ltd | Cooling water device |
| CN2804693Y (en) * | 2005-07-01 | 2006-08-09 | 中国人民解放军96531部队 | Constant temp dehumidifier |
| CN101788214A (en) * | 2009-12-18 | 2010-07-28 | 艾默生网络能源有限公司 | Air conditioning condenser |
| CN206755641U (en) * | 2017-05-25 | 2017-12-15 | 克莱门特捷联制冷设备(上海)有限公司 | A kind of air-cooled single cooler group of technical cooling under pole low temperature environment |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112880123A (en) * | 2019-11-29 | 2021-06-01 | 青岛海尔空调电子有限公司 | Compressor cooling device of air conditioner and control method thereof |
| CN112880123B (en) * | 2019-11-29 | 2021-12-28 | 青岛海尔空调电子有限公司 | Compressor cooling device of air conditioner and control method thereof |
| CN111550940A (en) * | 2020-05-16 | 2020-08-18 | 王咏伦 | Screw refrigerating unit in low-temperature environment and starting method thereof |
| CN114353361A (en) * | 2022-01-07 | 2022-04-15 | 青岛海尔空调电子有限公司 | Method and device for controlling refrigeration and freezing unit and refrigeration and freezing unit |
| CN114777292A (en) * | 2022-04-26 | 2022-07-22 | 青岛海尔空调电子有限公司 | A kind of air conditioning system and control method |
| CN114777292B (en) * | 2022-04-26 | 2024-03-29 | 青岛海尔空调电子有限公司 | Air conditioning system and control method |
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Application publication date: 20170804 |
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