CN104279720A - Air conditioner system and oil quantity and oil-way smoothness and blocking detection method - Google Patents
Air conditioner system and oil quantity and oil-way smoothness and blocking detection method Download PDFInfo
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- CN104279720A CN104279720A CN201310287729.7A CN201310287729A CN104279720A CN 104279720 A CN104279720 A CN 104279720A CN 201310287729 A CN201310287729 A CN 201310287729A CN 104279720 A CN104279720 A CN 104279720A
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- oil
- conditioning system
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- compressor
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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
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention provides an air conditioner system which comprises a compressor, an oil separator and an oil return capillary pipe. The first end of the oil return capillary pipe is connected to the oil separator, and the second end of the oil return capillary pipe is connected to an air-returning pipe of the compressor. The air conditioner system further comprises a first temperature sensor for detecting the pipe temperature T1 of an exhaust pipe of the compressor, a second temperature sensor for detecting the pipe temperature T2 of the first end of the oil return capillary pipe, a third temperature sensor for detecting the pipe temperature T3 of the second end of the oil return capillary pipe, a fourth temperature sensor for detecting the environment temperature T4 and a controller for comparing the temperatures measured by all the sensors and conducting control according to the comparison result. When the absolute value of T2-T1 is less than or equal to 10 DEG C, and the absolute value T3-T1 is less than or equal to 10 DEG C, the oil separator and the compressor are sufficient in oil, and the oil return capillary pipe is smooth. When the absolute value of T2-T4 is less than or equal to 8 DEG C and the absolute value of T3-T4 is less than or equal to 8 DEG C, the oil separator and the compressor lack oil. When the absolute value of T2-T1 is less than or equal to 10 DEG C and the absolute value of T3-T4 is less than or equal to 8 DEG C, the oil separator and the compressor are sufficient in oil, but the oil return capillary pipe is blocked.
Description
Technical field
The invention belongs to air-conditioning technical field, particularly relate to the detection method of a kind of air-conditioning system and oil mass and oil circuit pass blocking.
Background technology
The compressor oil mass of air-conditioning system and the unobstructed of oil return capillary have conclusive impact for the reliability of compressor and system.The most oil return of current air-conditioning system controls to be that oil is delivered to compressor return air pipe by oil return capillary by oil eliminator again, thus gets back to compressor by connecting oil eliminator at compressor exhaust pipe.When compressor and oil eliminator oil starvation or oil return capillary are blocked, compressor and air-conditioning system will be subject to fatal infringement.In prior art, not a kind of method can not check the oil mass of compressor and oil eliminator oil mass simultaneously and can judge the situation of oil return capillary pass blocking, and certainly also not having can air-conditioning system to carry out such a method.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of air-conditioning system, be intended to solve of the prior art check compressor simultaneously oil mass and oil eliminator oil mass and the problem of the techno-absence of oil return capillary pass blocking can be judged.
The embodiment of the present invention realizes like this, a kind of air-conditioning system, it comprises compressor and oil eliminator, described compressor is connected with blast pipe and muffler, one end of described blast pipe is connected on described compressor, the other end is connected on described oil eliminator, and described air-conditioning system also comprises oil return capillary, the first end of described oil return capillary is connected on described oil eliminator, and the second end relative with described first end is connected on described muffler, described air-conditioning system also comprises first temperature sensor of the Guan Wen detecting described blast pipe, detect second temperature sensor of the Guan Wen of the first end of described oil return capillary, detect the three-temperature sensor of the Guan Wen of the second end of described oil return capillary, 4th temperature sensor of testing environment temperature and more described first temperature sensor, described second temperature sensor, described three-temperature sensor, the temperature that described 4th temperature sensor detects also carries out the controller of corresponding control according to comparative result.
Further, described air-conditioning system is SPLIT AIR-CONDITIONING SYSTEM, multi-connected air conditioning system or modular air-conditioning system.
Further, the quantity of described compressor is at least one, and described compressor is frequency-changing cyclone compressor, digital scroll compressor or rotor compressor.
Further, described air-conditioning system also comprises cross valve, indoor set and off-premises station, described cross valve has first interface, the second interface, the 3rd interface and the 4th interface, described first interface is connected with described oil eliminator, described indoor set is serially connected with on described second interface, described 3rd interface is connected with described muffler, and described off-premises station is serially connected with on described 4th interface, and described indoor set is connected by the first pipeline with between off-premises station.
Further, the first interface of described cross valve is connected by the second pipeline with between described oil eliminator, be connected by the 3rd pipeline between described off-premises station and the 3rd interface of described cross valve, the 4th interface of described cross valve is connected by the 4th pipeline with between described indoor set.
Further, described first pipeline is connected with outdoor electrical expansion valve, the first stop valve and indoor electronic expansion valve in turn, described 4th pipeline is connected with the second stop valve.
Another object of the embodiment of the present invention is to provide a kind of oil mass of above-mentioned air-conditioning system and the detection method of oil circuit pass blocking, and it comprises the steps:
Described controller obtains temperature T1, the temperature T2 detected by described second temperature sensor, the temperature T3 detected by described three-temperature sensor and the temperature T4 detected by described 4th temperature sensor detected by described first temperature sensor respectively;
Described controller compares T2, T3 and T1 and judges whether the numerical relation of T2, T3 and T1 satisfies condition: | T2-T1|≤10 ° C and | T3-T1|≤10 ° C, if met, then judge that the oil mass of described oil eliminator and described compressor is sufficient, and described oil return capillary is unobstructed, described air-conditioning system continues to run;
Described controller compares T2, T3 and T4 and judges whether the numerical relation of T2, T3 and T4 satisfies condition: | T2-T4|≤8 ° C and | T3-T4|≤8 ° C, if met, what then judge described oil eliminator and described compressor lacks oil mass, and described air-conditioning system is out of service;
Described controller compares T1, T2, T3, T4 and judges whether the quantitative relation of T1, T2, T3, T4 satisfies condition: | T2-T1|≤10 ° C and | T3-T4|≤8 ° C, if met, then judge that the oil mass of described oil eliminator and described compressor is sufficient, but described oil return capillary is blocked, and described air-conditioning system is out of service.
Further, in first step after described controller obtains the step of T1, T2, T3, T4 respectively, judge the condition of the numerical relation of T2, T3 and T1 as | T2-T1|≤5 ° C and | T3-T1|≤5 ° C.
Further, in the second step after described controller obtains the step of T1, T2, T3, T4 respectively, judge the condition of the numerical relation of T2, T3 and T4 as | T2-T4|≤3 ° C and | T3-T4|≤3 ° C.
Further, in the 3rd step after described controller obtains the step of T1, T2, T3, T4 respectively, judge the condition of the quantitative relation of T1, T2, T3, T4 as | T2-T1|≤5 ° C and | T3-T4|≤3 ° C.
Air-conditioning system of the present invention possesses the hardware condition of the detection method implementing above-mentioned oil mass and oil circuit pass blocking, when the method for the scarce foot of this air-conditioning system examinations oil eliminator oil mass and compressor oil mass and oil return capillary pass blocking, the scarce foot judging oil eliminator oil mass and compressor oil mass can be realized, judge oil return capillary pass blocking simultaneously, avoid being blocked caused compressor and the lethal damage of air-conditioning system due to compressor and oil eliminator oil starvation or oil return capillary.
Accompanying drawing explanation
Fig. 1 is the structural representation of the air-conditioning system that the embodiment of the present invention provides.
Fig. 2 is the FB(flow block) of the oil mass of the air-conditioning system of Fig. 1 and the detection method of oil circuit pass blocking.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Refer to Fig. 1, the air-conditioning system 100 that the embodiment of the present invention provides comprises compressor 10 and oil eliminator 20.Described compressor 10 is connected with blast pipe 11 and muffler 12, and one end of described blast pipe 11 is connected on described compressor 10, and the other end is connected on described oil eliminator 20.
Described air-conditioning system 100 also comprises oil return capillary 30; The first end of described oil return capillary 30 is connected on described oil eliminator 20, and the second end relative with described first end is connected on described muffler 12.
Described air-conditioning system 100 also comprises first temperature sensor 40 of the Guan Wen detecting described blast pipe 11, detect second temperature sensor 50 of the Guan Wen of the first end of described oil return capillary 30, detect the three-temperature sensor 60 of the Guan Wen of the second end of described oil return capillary 30, 4th temperature sensor 70 of testing environment temperature and more described first temperature sensor 40, described second temperature sensor 50, described three-temperature sensor 60, the temperature that described 4th temperature sensor 70 detects also carries out the controller 80 of corresponding control according to comparative result.
Further, described air-conditioning system 100 also comprises cross valve 21, indoor set 31 and off-premises station 32, wherein, cross valve 21 has first interface 22, second interface 23, the 3rd interface 24 and the 4th interface 25, first interface 22 is connected with oil eliminator 20, indoor set 31 is serially connected with on the second interface 23, and the 3rd interface 24 is connected with muffler 12, and off-premises station 32 is serially connected with on the 4th interface 25.Described indoor set 31 is connected by one first pipeline 33 with between off-premises station 32.Particularly, be connected between first interface 22 with oil eliminator 20 by one second pipeline 34, be connected between off-premises station 32 with the second interface 23 by one the 3rd pipeline 35, the 4th interface 25 is connected by one the 4th pipeline 36 with between indoor set 31.First pipeline 33 is connected with in turn outdoor electrical expansion valve 41, first stop valve 42 and indoor electronic expansion valve 43.4th pipeline 36 is connected with the second stop valve 44.In the present embodiment, controller 80 is arranged on off-premises station 32.
In the present embodiment, described air-conditioning system 100 is SPLIT AIR-CONDITIONING SYSTEM, multi-connected air conditioning system or modular air-conditioning system.In other embodiments, described air-conditioning system 100 is not limited to SPLIT AIR-CONDITIONING SYSTEM, multi-connected air conditioning system and modular air-conditioning system these three kinds, described air-conditioning system 100 can be the other types air-conditioning system except SPLIT AIR-CONDITIONING SYSTEM, multi-connected air conditioning system and modular air-conditioning system
In the present embodiment, the quantity of described compressor 10 is one, and in other embodiments, the quantity of described compressor 10 can be more than one, and each compressor 10 is series in air-conditioning system 100.Therefore, in air-conditioning system 100 of the present invention, the quantity of described compressor 10 is at least one.
In the present embodiment, described compressor 10 is frequency-changing cyclone compressor, digital scroll compressor or rotor compressor.In other embodiments, described compressor 10 is not limited to frequency-changing cyclone compressor, digital scroll compressor rotor compressor these three kinds, described compressor 10 can be the compressor of the other types except frequency-changing cyclone compressor, digital scroll compressor and rotor compressor these three kinds, such as, centrifugal compressor, double-screw compressor, single screw compressor etc.
The embodiment of the present invention also provides a kind of oil mass of above-mentioned air-conditioning system 100 and the detection method of oil circuit pass blocking, for air-conditioning system 100, the detection of the detection of oil mass mainly oil eliminator 20 oil mass and compressor 10 oil mass, the detection of the detection of oil circuit pass blocking mainly oil return capillary 30 pass blocking.
The oil mass of above-mentioned air-conditioning system 100 and the detection method of oil circuit pass blocking, it comprises the steps:
Described controller 80 obtains the temperature T1 detected by described first temperature sensor 40, temperature T2, the temperature T3 detected by described three-temperature sensor 60 and the temperature T4 detected by described 4th temperature sensor 70 detected by described second temperature sensor 50 respectively;
Described controller 80 compares T2, T3 and T1 and judges whether the numerical relation of T2, T3 and T1 satisfies condition: | T2-T1|≤10 ° C and | T3-T1|≤10 ° C, if met, then judge that the oil mass of described oil eliminator and described compressor is sufficient, and described oil return capillary is unobstructed, described air-conditioning system 100 continues to run;
Described controller 80 compares T2, T3 and T4 and judges whether the numerical relation of T2, T3 and T4 satisfies condition: | T2-T4|≤8 ° C and | T3-T4|≤8 ° C, if met, what then judge described oil eliminator and described compressor lacks oil mass, and described air-conditioning system 100 is out of service;
Described controller 80 compares T1, T2, T3, T4 and judges whether the quantitative relation of T1, T2, T3, T4 satisfies condition: | T2-T1|≤10 ° C and | T3-T4|≤8 ° C, if met, then judge that the oil mass of described oil eliminator and described compressor is sufficient, but described oil return capillary is blocked, described air-conditioning system 100 is out of service.
The decision method of oil eliminator 20 oil mass of above-mentioned air-conditioning system 100 and the scarce foot of compressor 10 oil mass and oil return capillary 30 pass blocking is the temperature T1 detected respectively by the first temperature sensor 40, second temperature sensor 50, three-temperature sensor 60, the 4th temperature sensor 70, T2, T3, numerical relation between T4 judges the oil mass of oil eliminator 20 and the oil mass of compressor 10 and oil return capillary pass blocking situation, judges more direct, simple.
Further, in first step after controller 80 obtains the step of T1, T2, T3, T4 respectively, judge the condition of the numerical relation of T2, T3 and T1 as | T2-T1|≤5 ° C and | T3-T1|≤5 ° C, make in this step to the judgement of the oil mass abundance of described oil eliminator 20 and described compressor 10 and the unobstructed judgement of oil return capillary 30 more accurate, more precisely.
Further, in second step after controller 80 obtains the step of T1, T2, T3, T4 respectively, judge the condition of the numerical relation of T2, T3 and T4 as | T2-T4|≤3 ° C and | T3-T4|≤3 ° C, it is more accurate to the judgement lacking oil mass of described oil eliminator 20 and described compressor 10 to make in this step, more precisely.
Further, in the 3rd step after controller 80 obtains the step of T1, T2, T3, T4 respectively, judge the condition of the quantitative relation of T1, T2, T3, T4 as | T2-T1|≤5 ° C and | T3-T4|≤3 ° C, make the judgement that is blocked to the judgement of the oil mass abundance of described oil eliminator 20 and described compressor 10 and oil return capillary 30 in this step more accurate, more precisely.
Air-conditioning system 100 of the present invention has possessed the hardware condition of the detection method of the above-mentioned oil mass of enforcement (oil eliminator 20 oil mass and compressor 10 oil mass) and oil circuit (oil return capillary 30) pass blocking, when the method for the scarce foot of this air-conditioning system 100 examinations oil eliminator 20 oil mass and compressor 10 oil mass and oil return capillary 30 pass blocking, the scarce foot judging oil eliminator 20 oil mass and compressor 10 oil mass can be realized, judge oil return capillary 30 pass blocking simultaneously, avoid the lethal damage of compressor 10 because compressor 10 and oil eliminator 20 oil starvation or oil return capillary are blocked caused and air-conditioning system 100.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an air-conditioning system, it comprises compressor and oil eliminator, and described compressor is connected with blast pipe and muffler, and one end of described blast pipe is connected on described compressor, the other end is connected on described oil eliminator, it is characterized in that: described air-conditioning system also comprises oil return capillary, the first end of described oil return capillary is connected on described oil eliminator, and the second end relative with described first end is connected on described muffler, described air-conditioning system also comprises first temperature sensor of the Guan Wen detecting described blast pipe, detect second temperature sensor of the Guan Wen of the first end of described oil return capillary, detect the three-temperature sensor of the Guan Wen of the second end of described oil return capillary, 4th temperature sensor of testing environment temperature and more described first temperature sensor, described second temperature sensor, described three-temperature sensor, the temperature that described 4th temperature sensor detects also carries out the controller of corresponding control according to comparative result.
2. air-conditioning system as claimed in claim 1, is characterized in that: described air-conditioning system is SPLIT AIR-CONDITIONING SYSTEM, multi-connected air conditioning system or modular air-conditioning system.
3. air-conditioning system as claimed in claim 1 or 2, is characterized in that: the quantity of described compressor is at least one, and described compressor is frequency-changing cyclone compressor, digital scroll compressor or rotor compressor.
4. air-conditioning system as claimed in claim 1 or 2, it is characterized in that: described air-conditioning system also comprises cross valve, indoor set and off-premises station, described cross valve has first interface, the second interface, the 3rd interface and the 4th interface, described first interface is connected with described oil eliminator, described indoor set is serially connected with on described second interface, described 3rd interface is connected with described muffler, and described off-premises station is serially connected with on described 4th interface, and described indoor set is connected by the first pipeline with between off-premises station.
5. air-conditioning system as claimed in claim 4, it is characterized in that: the first interface of described cross valve is connected by the second pipeline with between described oil eliminator, be connected by the 3rd pipeline between described off-premises station and the second interface of described cross valve, the 4th interface of described cross valve is connected by the 4th pipeline with between described indoor set.
6. air-conditioning system as claimed in claim 5, is characterized in that: described first pipeline is connected with outdoor electrical expansion valve, the first stop valve and indoor electronic expansion valve in turn, described 4th pipeline is connected with the second stop valve.
7. the oil mass of the air-conditioning system as described in any one of claim 1-6 and a detection method for oil circuit pass blocking, it comprises the steps:
Described controller obtains temperature T1, the temperature T2 detected by described second temperature sensor, the temperature T3 detected by described three-temperature sensor and the temperature T4 detected by described 4th temperature sensor detected by described first temperature sensor respectively;
Described controller compares T2, T3 and T1 and judges whether the numerical relation of T2, T3 and T1 satisfies condition: | T2-T1|≤10 ° C and | T3-T1|≤10 ° C, if met, then judge that the oil mass of described oil eliminator and described compressor is sufficient, and described oil return capillary is unobstructed, described air-conditioning system continues to run;
Described controller compares T2, T3 and T4 and judges whether the numerical relation of T2, T3 and T4 satisfies condition: | T2-T4|≤8 ° C and | T3-T4|≤8 ° C, if met, what then judge described oil eliminator and described compressor lacks oil mass, and described air-conditioning system is out of service;
Described controller compares T1, T2, T3, T4 and judges whether the quantitative relation of T1, T2, T3, T4 satisfies condition: | T2-T1|≤10 ° C and | T3-T4|≤8 ° C, if met, then judge that the oil mass of described oil eliminator and described compressor is sufficient, but described oil return capillary is blocked, and described air-conditioning system is out of service.
8. the decision method of the oil eliminator oil mass of air-conditioning system as claimed in claim 7 and the scarce foot of compressor oil mass and oil return capillary pass blocking, it is characterized in that: in first step after described controller obtains the step of T1, T2, T3, T4 respectively, judge the condition of the numerical relation of T2, T3 and T1 as | T2-T1|≤5 ° C and | T3-T1|≤5 ° C.
9. the decision method of the oil eliminator oil mass of air-conditioning system as claimed in claim 7 and the scarce foot of compressor oil mass and oil return capillary pass blocking, it is characterized in that: in the second step after described controller obtains the step of T1, T2, T3, T4 respectively, judge the condition of the numerical relation of T2, T3 and T4 as | T2-T4|≤3 ° C and | T3-T4|≤3 ° C.
10. the decision method of the oil eliminator oil mass of air-conditioning system as claimed in claim 7 and the scarce foot of compressor oil mass and oil return capillary pass blocking, it is characterized in that: in the 3rd step after described controller obtains the step of T1, T2, T3, T4 respectively, judge the condition of the quantitative relation of T1, T2, T3, T4 as | T2-T1|≤5 ° C and | T3-T4|≤3 ° C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310287729.7A CN104279720B (en) | 2013-07-09 | 2013-07-09 | Detection method for oil quantity and oil-way smoothness and blocking of air conditioner system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310287729.7A CN104279720B (en) | 2013-07-09 | 2013-07-09 | Detection method for oil quantity and oil-way smoothness and blocking of air conditioner system |
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| CN104279720A true CN104279720A (en) | 2015-01-14 |
| CN104279720B CN104279720B (en) | 2017-02-01 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105954052A (en) * | 2016-05-27 | 2016-09-21 | 珠海格力电器股份有限公司 | Capillary tube blockage detection system and method |
| CN108507121A (en) * | 2018-04-10 | 2018-09-07 | 宁波奥克斯电气股份有限公司 | Starting of air conditioner control method and air conditioner |
| CN111811112A (en) * | 2020-07-13 | 2020-10-23 | 南京天加环境科技有限公司 | Intelligent oil return multi-split air conditioner system |
| CN113339961A (en) * | 2021-05-10 | 2021-09-03 | 广东Tcl智能暖通设备有限公司 | Control method and device of air conditioner, air conditioner and storage medium |
| WO2021179250A1 (en) * | 2020-03-12 | 2021-09-16 | Johnson Controls Technology Company | Systems and methods for controlling variable refrigerant flow systems and equipment using artificial intelligence models |
| CN113551369A (en) * | 2021-07-09 | 2021-10-26 | 珠海格力电器股份有限公司 | Control system for detecting blockage of refrigeration system and blockage detection method |
| CN114923273A (en) * | 2022-05-06 | 2022-08-19 | 青岛海信日立空调系统有限公司 | Air conditioning system and control method thereof |
Family Cites Families (2)
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| CN1752669A (en) * | 2004-09-24 | 2006-03-29 | 乐金电子(天津)电器有限公司 | Central air conditioner and controlling method thereof |
| CN101813396B (en) * | 2009-02-19 | 2011-09-21 | 珠海格力电器股份有限公司 | Air conditioner and method for detecting oil level of compressor thereof |
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| CN105954052A (en) * | 2016-05-27 | 2016-09-21 | 珠海格力电器股份有限公司 | Capillary tube blockage detection system and method |
| CN105954052B (en) * | 2016-05-27 | 2018-04-20 | 珠海格力电器股份有限公司 | Capillary tube blockage detection system and method |
| CN108507121A (en) * | 2018-04-10 | 2018-09-07 | 宁波奥克斯电气股份有限公司 | Starting of air conditioner control method and air conditioner |
| CN108507121B (en) * | 2018-04-10 | 2020-07-31 | 宁波奥克斯电气股份有限公司 | Air conditioner starting control method and air conditioner |
| WO2021179250A1 (en) * | 2020-03-12 | 2021-09-16 | Johnson Controls Technology Company | Systems and methods for controlling variable refrigerant flow systems and equipment using artificial intelligence models |
| CN111811112A (en) * | 2020-07-13 | 2020-10-23 | 南京天加环境科技有限公司 | Intelligent oil return multi-split air conditioner system |
| CN113339961A (en) * | 2021-05-10 | 2021-09-03 | 广东Tcl智能暖通设备有限公司 | Control method and device of air conditioner, air conditioner and storage medium |
| CN113551369A (en) * | 2021-07-09 | 2021-10-26 | 珠海格力电器股份有限公司 | Control system for detecting blockage of refrigeration system and blockage detection method |
| CN113551369B (en) * | 2021-07-09 | 2022-04-26 | 珠海格力电器股份有限公司 | Control system for detecting blockage of refrigeration system and blockage detection method |
| CN114923273A (en) * | 2022-05-06 | 2022-08-19 | 青岛海信日立空调系统有限公司 | Air conditioning system and control method thereof |
| CN114923273B (en) * | 2022-05-06 | 2023-11-07 | 青岛海信日立空调系统有限公司 | Air conditioning system and control method thereof |
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