CN111829137A - Method and system for identifying mixed air fault of air conditioning system - Google Patents
Method and system for identifying mixed air fault of air conditioning system Download PDFInfo
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- CN111829137A CN111829137A CN202010745328.1A CN202010745328A CN111829137A CN 111829137 A CN111829137 A CN 111829137A CN 202010745328 A CN202010745328 A CN 202010745328A CN 111829137 A CN111829137 A CN 111829137A
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/33—Responding to malfunctions or emergencies to fire, excessive heat or smoke
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/36—Responding to malfunctions or emergencies to leakage of heat-exchange fluid
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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
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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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
- F24F11/88—Electrical aspects, e.g. circuits
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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
- F24F11/89—Arrangement or mounting of control or safety devices
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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
- 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
- F25B49/022—Compressor control arrangements
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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
- F25B2500/00—Problems to be solved
- F25B2500/22—Preventing, detecting or repairing leaks of refrigeration fluids
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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)
- Signal Processing (AREA)
- Thermal Sciences (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to the field of air conditioners, in particular to a method and a system for identifying mixed air faults of an air conditioning system, which realize the quick and effective judgment of the internal condition of an air conditioner compressor through winding temperature. The scheme is that a compressor winding temperature abnormity determination value Ta, a compressor winding temperature standard value table and a compressor power standard value table are prestored in an air conditioning system; monitoring the temperature T of a compressor winding in real time, if the T is larger than or equal to Ta, cutting off a system power supply, prompting the start-up information, and sending a fault code E1; if T is less than Ta, checking whether the compressor winding temperature T is greater than a winding temperature standard value Tb corresponding to a current frequency compressor winding temperature standard value table, if yes, calculating the current power of the compressor, if the compressor power is less than a power standard value Pb corresponding to a current frequency compressor power standard value table, judging that the system is in a fluorine-lacking state, otherwise, judging that mixed air exists in the system, and sending a fault code E3. The method is suitable for identifying the mixed air fault of the air conditioning system.
Description
Technical Field
The invention relates to the field of air conditioners, in particular to a method and a system for identifying mixed air faults of an air conditioning system.
Background
In recent years, the air conditioner has more and more explosions during installation or maintenance:
event 1: at 21 days 6 months and 3 days, the explosion accident of the Shandong Bao 13 of the national trade road of Longhua region in Haikou caused 1 death and 10 injuries. Through the on-site investigation of experts, the accident caused by the explosion of the central air conditioner is preliminarily judged.
Event 2: about 40 minutes at 10 am in 2017, when a householder in a Yihe district located at the intersection of the open road and the sea road of the salt city area in Jiangsu province suddenly explodes when installing an air conditioner, and the man dies on the spot.
Event 3: one citizen of the west security has the requirement of moving the air conditioner, then, through the small advertisements posted in the residential quarter and the corridor, a telephone is found and a master can reserve to move the air conditioner well, and when the power supply is plugged in and the air conditioner is started for less than 2 minutes, the outdoor machine is exploded, and no casualties exist in the suggestive situation.
Event 4: one owner of a salt city, who was the air conditioner installer, has basic air conditioner installing capability and explodes when he installs the air conditioner for his own home, unfortunately the owner dies.
Event 5: two-year light florists in the Yicheng city of jujube village explode when the air conditioner is maintained, and the younger florists are exploded to death.
In addition to the above-mentioned air conditioner explosion event occurring in the home of the user, there are also cases where explosion occurs during the air conditioner production and assembly process, and there are two analyses for the reason why the air conditioner explodes:
1. explosion due to exposure to open fire due to a large amount of leakage of flammable refrigerants;
2. a certain amount of air is mixed in the system, oxygen supporting combustion is contained in the air when the compressor runs, and the air is not easy to be compressed and liquefied to generate high pressure due to the oil and the refrigerant of the compressor, and the high temperature generated by the compressor for a period of time is integrated to cause explosion;
3. the high-pressure valve is closed, the compressor is started, the system leakage is checked in such a way, after the compressor runs for several minutes, the refrigerating machine oil can generate spontaneous combustion under the specific pressure and temperature conditions, the abnormal high-temperature and high-pressure conditions can be caused in the compressor, and finally the shell of the compressor can be broken and then explode.
For the 1 st reason, the general air conditioner components are subjected to pressure test and refrigerant leakage check in the production process, the probability of a large amount of leakage of the general finished product is very small, and the leakage generally cannot occur if the normal operation is carried out and open fire is not met in the installation and maintenance process;
for the 2 nd reason, which typically occurs during installation, maintenance or production of the air conditioner, outside air enters the compressor chamber as a result of the refrigerant charge.
For the 3 rd reason, the method also basically occurs in the installation, maintenance or production process of the air conditioner, and the index performance of the compressor is similar to that in the 2 nd reason.
For refrigerant leakage, a large number of patent technologies for refrigerant leakage detection exist in the prior art to specifically solve the technical problem; such as patents CN202010321614.5, CN201910803891.7, CN201910095346.7, CN201910095332.5, etc., but lack a recognition method for effectively presenting mixed air to the air conditioning system.
Disclosure of Invention
The invention aims to provide a method and a system for identifying mixed air faults of an air conditioning system, which can realize the rapid judgment of the internal condition of an air conditioner compressor through the winding temperature, and can rapidly cut off a system power supply and reduce the probability of explosion if the possibility of explosion occurs; and meanwhile, the double judgment of the winding temperature and the compressor power is utilized to identify whether the air conditioning system has the fluorine shortage condition or the mixed air condition, so that the air conditioning system is favorable for processing different conditions after sale in time.
The invention adopts the following technical scheme to realize the purpose, and the method for identifying the mixed air fault of the air conditioning system comprises the following steps:
the method comprises the following steps that (1) a compressor winding temperature abnormity determination value Ta, a compressor winding temperature standard value table and a compressor power standard value table are prestored in an air conditioning system, wherein the compressor winding temperature standard value table comprises different compressor winding temperature standard values corresponding to different frequencies, and the compressor power standard value table comprises different compressor power standard values corresponding to different frequencies;
step (2), monitoring the temperature T of a compressor winding in real time in the working process of the air conditioner, if the T is larger than or equal to Ta, cutting off a system power supply, prompting the startup-free information, and sending a fault code E1; if T is less than Ta, checking whether the temperature T of the compressor winding is greater than a corresponding compressor winding temperature standard value Tb in a compressor winding temperature standard value table under the current frequency, and if yes, entering the step (3);
step (3), obtaining the current of the motor of the compressor, and calculating the power of the compressor;
step (4), if the power of the compressor is smaller than a compressor power standard value Pb corresponding to the compressor power standard value table under the current frequency, judging that the system is in a fluorine-lacking state, otherwise, judging that mixed air exists in the system, and sending a fault code E3;
and (5) if the system is in a fluorine-lacking state, continuously monitoring the temperature T of the winding of the compressor, if the temperature T of the winding of the compressor is increased under the conditions that the external environment temperature is unchanged and the current frequency of the compressor is unchanged, the temperature T of the winding of the compressor is not more than an abnormal judgment value Ta of the temperature of the winding of the compressor, and the power of the compressor is reduced, judging that continuous leakage points of the system occur, and sending a fault code E2.
An identification system for mixed air faults of an air conditioning system, comprising:
the storage module is used for prestoring a compressor winding temperature abnormity determination value Ta, a compressor winding temperature standard value table and a compressor power standard value table in the air conditioning system, wherein the compressor winding temperature standard value table comprises different compressor winding temperature standard values corresponding to different frequencies, and the compressor power standard value table comprises different compressor power standard values corresponding to different frequencies;
the monitoring module is used for monitoring the value of the temperature T of the compressor winding in real time;
the processing module is used for carrying out corresponding processing according to the temperature T of the compressor winding, if the T is larger than or equal to Ta, the system power supply is cut off, starting-up information is prompted, and a fault code E1 is sent; if T is less than Ta, checking whether the temperature T of the compressor winding is greater than a corresponding compressor winding temperature standard value Tb in a compressor winding temperature standard value table under the current frequency, if yes, obtaining the current of a motor of the compressor, and calculating the power of the compressor;
the judging module is used for judging the state of the compressor according to the compressor power, the abnormal judgment value Ta of the compressor winding temperature, the standard value table of the compressor winding temperature and the standard value table of the compressor power, if the compressor power is smaller than the corresponding standard value Pb of the compressor power in the standard value table of the compressor power under the current frequency, the system is judged to be in a fluorine-lacking state, otherwise, mixed air in the system is judged to be generated, and a fault code E3 is sent; and if the system is in a fluorine-lacking state, continuously monitoring the temperature T of the winding of the compressor, and if the temperature T of the winding of the compressor is increased under the conditions that the external environment temperature is unchanged and the current frequency of the compressor is unchanged, the temperature T of the winding of the compressor is not more than the abnormal judgment value Ta of the winding of the compressor, and the power of the compressor is reduced, judging that the system has continuous leakage points, and sending a fault code E2.
The method comprises the steps that firstly, a compressor winding temperature abnormity judgment value Ta, a compressor winding temperature standard value table and a compressor power standard value table are prestored in an air conditioning system, wherein the compressor winding temperature standard value table comprises different compressor winding temperature standard values corresponding to different frequencies, and the compressor power standard value table comprises different compressor power standard values corresponding to different frequencies; in the working process of the air conditioner, monitoring the temperature T of a compressor winding in real time, if the T is larger than or equal to Ta, cutting off a system power supply, prompting the start-up information, and sending a fault code E1; if T is less than Ta, checking whether the temperature T of the compressor winding is greater than a corresponding compressor winding temperature standard value Tb in a compressor winding temperature standard value table under the current frequency, if yes, obtaining the current of a motor of the compressor, and calculating the power of the compressor; if the power of the compressor is smaller than a compressor power standard value Pb corresponding to the compressor power standard value table under the current frequency, judging that the system is in a fluorine-lacking state, otherwise, judging that mixed air exists in the system, and sending a fault code E3; and if the system is in a fluorine-lacking state, continuously monitoring the temperature T of the winding of the compressor, and if the temperature T of the winding of the compressor is increased under the conditions that the external environment temperature is unchanged and the current frequency of the compressor is unchanged, the temperature T of the winding of the compressor is not more than the abnormal judgment value Ta of the winding of the compressor, and the power of the compressor is reduced, judging that the system has continuous leakage points, and sending a fault code E2. The internal condition of the air-conditioning compressor is judged rapidly through the winding temperature, if the possibility of explosion occurs, a system power supply is cut off rapidly, the probability of explosion is reduced, and meanwhile, the condition that the air-conditioning system is lack of fluorine or mixed air is identified by utilizing the dual judgment of the winding temperature and the compressor power, so that the air-conditioning compressor is favorable for being processed after sale in time aiming at different conditions.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
The invention discloses a method for identifying mixed air faults of an air conditioning system, wherein the flow chart of the method is shown in figure 1, and the method comprises the following steps:
step 101: pre-storing a compressor winding temperature abnormity determination value Ta, a compressor winding temperature standard value table and a compressor power standard value table in an air conditioning system;
step 102: monitoring the temperature T of a compressor winding in real time in the working process of the air conditioner;
step 103: if T is larger than or equal to Ta, cutting off the power supply of the system, prompting the startup-free information, and sending a fault code E1;
step 104: if T is less than Ta, checking whether the temperature T of the compressor winding is greater than a corresponding compressor winding temperature standard value Tb in a compressor winding temperature standard value table under the current frequency;
step 105: if T is larger than Tb, obtaining the current of the motor of the compressor, and calculating the power of the compressor;
step 106: if the power of the compressor is larger than a compressor power standard value Pb corresponding to the compressor power standard value table under the current frequency, judging that mixed air exists in the system, and sending a fault code E3;
step 107: if the compressor power is smaller than the compressor power standard value Pb corresponding to the compressor power standard value table under the current frequency, judging that the system is in a fluorine-lacking state;
step 108: and if the system is in a fluorine-lacking state, continuously monitoring the temperature T of the winding of the compressor, and if the temperature T of the winding of the compressor is increased under the conditions that the external environment temperature is unchanged and the current frequency of the compressor is unchanged, the temperature T of the winding of the compressor is not more than the abnormal judgment value Ta of the winding of the compressor, and the power of the compressor is reduced, judging that the system has continuous leakage points, and sending a fault code E2.
In step 101, the compressor winding temperature standard value table comprises different compressor winding temperature standard values corresponding to different frequencies; the compressor power standard value table includes different compressor power standard values for different frequencies.
An identification system for mixed air faults of an air conditioning system, comprising:
the storage module is used for prestoring a compressor winding temperature abnormity determination value Ta, a compressor winding temperature standard value table and a compressor power standard value table in the air conditioning system, wherein the compressor winding temperature standard value table comprises different compressor winding temperature standard values corresponding to different frequencies, and the compressor power standard value table comprises different compressor power standard values corresponding to different frequencies;
the monitoring module is used for monitoring the value of the temperature T of the compressor winding in real time;
the processing module is used for carrying out corresponding processing according to the temperature T of the compressor winding, if the T is larger than or equal to Ta, the system power supply is cut off, starting-up information is prompted, and a fault code E1 is sent; if T is less than Ta, checking whether the temperature T of the compressor winding is greater than a corresponding compressor winding temperature standard value Tb in a compressor winding temperature standard value table under the current frequency, if yes, obtaining the current of a motor of the compressor, and calculating the power of the compressor;
the judging module is used for judging the state of the compressor according to the compressor power, the abnormal judgment value Ta of the compressor winding temperature, the standard value table of the compressor winding temperature and the standard value table of the compressor power, if the compressor power is smaller than the corresponding standard value Pb of the compressor power in the standard value table of the compressor power under the current frequency, the system is judged to be in a fluorine-lacking state, otherwise, mixed air in the system is judged to be generated, and a fault code E3 is sent; and if the system is in a fluorine-lacking state, continuously monitoring the temperature T of the winding of the compressor, and if the temperature T of the winding of the compressor is increased under the conditions that the external environment temperature is unchanged and the current frequency of the compressor is unchanged, the temperature T of the winding of the compressor is not more than the abnormal judgment value Ta of the winding of the compressor, and the power of the compressor is reduced, judging that the system has continuous leakage points, and sending a fault code E2.
The judgment principle of the invention is as follows: when air is mixed in the compressor, the compression ratio of the air and the refrigerant gas is not consistent, and the same volume of air needs to consume larger pressure for compression, so that the current of the motor of the compressor is increased, the power is increased, and the temperature of the winding of the motor is increased when the current is increased.
After the air is mixed in the compressor on the other hand, the air can not be compressed and liquefied synchronously with the refrigerant and discharged, so that the state of mixing the air and the oil in the compressor can be formed, when the temperature of the internal gas reaches the ignition point under the work of the compressor, the combustion reaction can be rapidly carried out, a large amount of heat is released, and the temperature of a motor winding of the compressor is rapidly increased. This situation is very dangerous and requires a rapid power cut-off of the compressor to prevent further expansion of the combustion reaction leading to explosion of the compressor.
Generally, in the process of filling refrigerant into an air conditioner, when an air conditioner pipeline has an inconspicuous leakage point, if an air conditioner compressor is operated to perform air suction, external air is sucked by an air conditioner pipeline system under the action of internal negative pressure, so that the external air enters the air conditioner system and forms mixed gas with the refrigerant, the mixed gas forms a high-temperature and high-pressure gas state under the action of the compressor, and due to the difference between air compressibility and the refrigerant and multiple dangerous factors such as oxygen contained in the air, the mixed gas explosion event of the air conditioner system is easily caused.
In conclusion, the invention can realize that the internal condition of the air conditioner compressor can be rapidly judged through the winding temperature, if the possibility of explosion occurs, the power supply of the system is rapidly cut off, and the probability of explosion occurrence is reduced; and meanwhile, the double judgment of the winding temperature and the compressor power is utilized to identify whether the air conditioning system has the fluorine shortage condition or the mixed air condition, so that the air conditioning system is favorable for processing different conditions after sale in time.
Claims (2)
1. The method for identifying the mixed air fault of the air conditioning system is characterized by comprising the following steps:
the method comprises the following steps that (1) a compressor winding temperature abnormity determination value Ta, a compressor winding temperature standard value table and a compressor power standard value table are prestored in an air conditioning system, wherein the compressor winding temperature standard value table comprises different compressor winding temperature standard values corresponding to different frequencies, and the compressor power standard value table comprises different compressor power standard values corresponding to different frequencies;
step (2), monitoring the temperature T of a compressor winding in real time in the working process of the air conditioner, if the T is larger than or equal to Ta, cutting off a system power supply, prompting the startup-free information, and sending a fault code E1; if T is less than Ta, checking whether the temperature T of the compressor winding is greater than a corresponding compressor winding temperature standard value Tb in a compressor winding temperature standard value table under the current frequency, and if yes, entering the step (3);
step (3), obtaining the current of the motor of the compressor, and calculating the power of the compressor;
step (4), if the power of the compressor is smaller than a compressor power standard value Pb corresponding to the compressor power standard value table under the current frequency, judging that the system is in a fluorine-lacking state, otherwise, judging that mixed air exists in the system, and sending a fault code E3;
and (5) if the system is in a fluorine-lacking state, continuously monitoring the temperature T of the winding of the compressor, if the temperature T of the winding of the compressor is increased under the conditions that the external environment temperature is unchanged and the current frequency of the compressor is unchanged, the temperature T of the winding of the compressor is not more than an abnormal judgment value Ta of the temperature of the winding of the compressor, and the power of the compressor is reduced, judging that continuous leakage points of the system occur, and sending a fault code E2.
2. Air conditioning system mixed air fault's identification system appears, its characterized in that includes:
the storage module is used for prestoring a compressor winding temperature abnormity determination value Ta, a compressor winding temperature standard value table and a compressor power standard value table in the air conditioning system, wherein the compressor winding temperature standard value table comprises different compressor winding temperature standard values corresponding to different frequencies, and the compressor power standard value table comprises different compressor power standard values corresponding to different frequencies;
the monitoring module is used for monitoring the value of the temperature T of the compressor winding in real time;
the processing module is used for carrying out corresponding processing according to the temperature T of the compressor winding, if the T is larger than or equal to Ta, the system power supply is cut off, starting-up information is prompted, and a fault code E1 is sent; if T is less than Ta, checking whether the temperature T of the compressor winding is greater than a corresponding compressor winding temperature standard value Tb in a compressor winding temperature standard value table under the current frequency, if yes, obtaining the current of a motor of the compressor, and calculating the power of the compressor;
the judging module is used for judging the state of the compressor according to the compressor power, the abnormal judgment value Ta of the compressor winding temperature, the standard value table of the compressor winding temperature and the standard value table of the compressor power, if the compressor power is smaller than the corresponding standard value Pb of the compressor power in the standard value table of the compressor power under the current frequency, the system is judged to be in a fluorine-lacking state, otherwise, mixed air in the system is judged to be generated, and a fault code E3 is sent; and if the system is in a fluorine-lacking state, continuously monitoring the temperature T of the winding of the compressor, and if the temperature T of the winding of the compressor is increased under the conditions that the external environment temperature is unchanged and the current frequency of the compressor is unchanged, the temperature T of the winding of the compressor is not more than the abnormal judgment value Ta of the winding of the compressor, and the power of the compressor is reduced, judging that the system has continuous leakage points, and sending a fault code E2.
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| CN113028585A (en) * | 2021-03-31 | 2021-06-25 | 四川虹美智能科技有限公司 | Control protection method and system for compressor |
| CN113028586A (en) * | 2021-03-31 | 2021-06-25 | 四川虹美智能科技有限公司 | Control protection method and system for compressor |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112833596A (en) * | 2021-01-21 | 2021-05-25 | 四川长虹空调有限公司 | Method for judging state of refrigerant of refrigerating system |
| CN113028587A (en) * | 2021-03-31 | 2021-06-25 | 四川虹美智能科技有限公司 | Fault handling method and system for compressor |
| CN113028585A (en) * | 2021-03-31 | 2021-06-25 | 四川虹美智能科技有限公司 | Control protection method and system for compressor |
| CN113028586A (en) * | 2021-03-31 | 2021-06-25 | 四川虹美智能科技有限公司 | Control protection method and system for compressor |
| CN113028588A (en) * | 2021-03-31 | 2021-06-25 | 四川虹美智能科技有限公司 | Fault protection method and system for compressor |
| WO2023228628A1 (en) * | 2022-05-24 | 2023-11-30 | パナソニックＩｐマネジメント株式会社 | Refrigeration cycle device |
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