CN106352629A - Air conditioner and bypass heating defrosting control method thereof - Google Patents
Air conditioner and bypass heating defrosting control method thereof Download PDFInfo
- Publication number
- CN106352629A CN106352629A CN201610700956.1A CN201610700956A CN106352629A CN 106352629 A CN106352629 A CN 106352629A CN 201610700956 A CN201610700956 A CN 201610700956A CN 106352629 A CN106352629 A CN 106352629A
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- China
- Prior art keywords
- heat exchanger
- outdoor heat
- air
- throttling arrangement
- pass line
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Classifications
-
- 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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
- F25B47/025—Defrosting cycles hot gas defrosting by reversing the 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
- 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
- F25B2400/04—Refrigeration circuit bypassing means
- F25B2400/0409—Refrigeration circuit bypassing means for the evaporator
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention provides an air conditioner. The air conditioner comprises a compressor, a four-way valve, an outdoor heat exchanger, a throttling device, an indoor heat exchanger, a refrigerant pipeline and a bypass pipeline; the compressor, the outdoor heat exchanger, the throttling device and the indoor heat exchanger are sequentially communicated through the refrigerant pipeline, the two ends of the bypass pipeline are communicated with the refrigerant pipeline, and the bypass pipeline can enable a refrigerant in the refrigerant pipeline to bypass the throttling device to enter the outdoor heat exchanger. When the air conditioner starts defrosting, the air conditioner keeps running in a heating mode, and the high-temperature and high-pressure refrigerant output by the compressor cannot be subjected to throttling depressurization in a system; accordingly, the refrigerant entering the outdoor heat exchanger still keeps a high temperature, the outdoor heat exchanger can be defrosted through the self heat of the refrigerant, no influence can be caused to the indoor temperature, the indoor heat exchanger cannot generate an abnormal sound due to heat expansion and cold contraction, and then the service life of the air conditioner is prolonged.
Description
Technical field
The present invention relates to air-conditioning equipment and air-conditioner control method technical field, more particularly to a kind of air-conditioner and its side
Logical heating and defrosting control method.
Background technology
Air source heat pump system frosting defrost problem is the key technical problem of air-conditioning, on heating performance and comfortableness impact
Significantly.It is less than 5 DEG C in outdoor environment temperature, the easy frosting of air-conditioning, performance decays rapidly, leads to heating capacity not enough.Air-conditioning is general at present
All over using conventional reverse circulation defrosting, during defrosting, air conditioner refrigerating mode operation, vaporizer inner tube rapid drop in temperature to-
Less than 30 DEG C, from the substantial amounts of heat of indoor absorption, make 6～8 DEG C of the rapid reduction of temperature in room, have a strong impact on user using comfortable
Degree, and the continuous conversion with refrigeration, heating mode, indoor set flows through coolant and frequently carries out high/low temperature switching, causes interior
Machine section structure produces frequently abnormal sound noise because expanding with heat and contract with cold.
Content of the invention
Based on this it is necessary to different for existing impact indoor temperature during current air-conditioner defrosting and indoor set
Ring the problem of noise, provide a kind of indoor temperature is affected with little, indoor set will not be because of the air-conditioning producing abnormal sound noise that expands with heat and contract with cold
Device and its bypass heating and defrosting control method.
Above-mentioned purpose is achieved through the following technical solutions:
A kind of air-conditioner, including compressor, cross valve, outdoor heat exchanger, throttling arrangement, indoor heat exchanger and refrigerant pipe
Road, described compressor, outdoor heat exchanger, throttling arrangement and indoor heat exchanger are sequentially communicated by refrigerant pipe, also include bypassing
Pipeline, the two ends of described by-pass line are connected with refrigerant pipe respectively, and by-pass line can make the coolant in refrigerant pipe
Bypass throttling arrangement and enter outdoor heat exchanger.
Wherein in an embodiment, described by-pass line is provided with the first bypass cock valve.
Wherein in an embodiment, one end of described by-pass line is connected between indoor heat exchanger and throttling arrangement,
The other end of by-pass line is connected between outdoor heat exchanger and throttling arrangement.
Wherein in an embodiment, the entrance point of described throttling arrangement or the port of export are provided with the second bypass cock valve.
Wherein in an embodiment, one end of described by-pass line is connected between cross valve and indoor heat exchanger, other
The other end threaded a pipe is connected between outdoor heat exchanger and throttling arrangement.
Wherein in an embodiment, the entrance point of described indoor heat exchanger or the port of export or in throttling arrangement
The port of export is provided with the 3rd bypass cock valve.
Wherein in an embodiment, described throttling arrangement is electric expansion valve, capillary tube or electric expansion valve and capillary
The tandem compound of pipe.
Present invention also offers a kind of air-conditioner bypasses heating and defrosting control method, described air-conditioner is arbitrary above-mentioned sky
Adjust device, when the defrost starts, cross valve is air conditioner heat-production pattern, and the high temperature refrigerant of compressor output is bypassed by by-pass line
Throttling arrangement enters outdoor heat exchanger, and high temperature refrigerant carries out returning compressor after defrost to described outdoor heat exchanger.
Wherein in an embodiment, the high temperature refrigerant of described compressor output is after indoor heat exchanger, then passes through side
Thread a pipe and bypass throttling arrangement entrance outdoor heat exchanger.
Wherein in an embodiment, the high temperature refrigerant of described compressor output bypasses indoor heat exchanger by by-pass line
Enter outdoor heat exchanger with throttling arrangement.
Wherein in an embodiment, when the defrost starts, reduce the external heat exchange of indoor heat exchanger and outdoor heat exchanger.
Wherein in an embodiment, when the defrost starts, reduce the heat exchange wind in indoor heat exchanger and outdoor heat exchanger
The rotating speed of machine or closed down.
The invention has the beneficial effects as follows: the air-conditioner of the present invention is provided with by-pass line, by-pass line on refrigerant pipe
Coolant can be made to bypass throttling arrangement and to be directly entered outdoor heat exchanger, that is, when starting defrosting, keep the heating mode of air-conditioner,
The High Temperature High Pressure coolant of compressor output will not carry out reducing pressure by regulating flow in system, because coolant does not carry out reducing pressure by regulating flow, so
The coolant entering outdoor heat exchanger also maintains higher temperature, it is possible to use coolant self heat is to outdoor heat exchanger
Frost work, and indoor temperature will not be impacted, indoor heat exchanger will not be made simultaneously due to the generation abnormal sound that expands with heat and contract with cold, increase
Air-conditioner service life.
Brief description
Fig. 1 is the structural representation of air-conditioner embodiment one of the present invention；
Fig. 2 is the structural representation of air-conditioner embodiment two of the present invention；
Fig. 3 is the structural representation of air-conditioner embodiment three of the present invention；
Fig. 4 is the structural representation of air-conditioner example IV of the present invention.
Wherein:
100- compressor；
200- cross valve；
300- outdoor heat exchanger；
400- throttling arrangement；
500- indoor heat exchanger；
600- refrigerant pipe；
700- by-pass line；
710- the first bypass cock valve；
720- the second bypass cock valve；
730- the 3rd bypass cock valve.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, by the following examples, and with reference to attached
Figure, is further elaborated to air-conditioner of the present invention and its bypass heating and defrosting control method.It should be appreciated that this place is retouched
The specific embodiment stated only in order to explain the present invention, is not intended to limit the present invention.
Shown in Figure 1, the first embodiment of air-conditioner of the present invention, including compressor 100, cross valve 200, outdoor
Heat exchanger 300, throttling arrangement 400, indoor heat exchanger 500, refrigerant pipe 600 and by-pass line 700, compressor 100, outdoor are changed
Hot device 300, throttling arrangement 400 and indoor heat exchanger 500 are sequentially communicated by refrigerant pipe 600, and the two ends of by-pass line 700 are divided
It is not connected with refrigerant pipe 600, and by-pass line 700 can make the coolant in refrigerant pipe 600 bypass throttling arrangement 400 to enter
Enter outdoor heat exchanger 300.
In the air-conditioner of present embodiment, it is possible to achieve the air-conditioner bypass heating and defrosting control method of the present invention: when
When starting defrosting, cross valve 200 keeps air conditioner heat-production pattern, and the high temperature refrigerant of compressor 100 output passes through by-pass line 700
Bypass throttling arrangement 400 and enter outdoor heat exchanger 300, high temperature refrigerant carries out returning compressor after defrost to outdoor heat exchanger 300
100.The High Temperature High Pressure coolant of compressor 100 output will not carry out reducing pressure by regulating flow in system, because coolant does not carry out throttling fall
Pressure, so the coolant entering outdoor heat exchanger 300 also maintains higher temperature, it is possible to use coolant self heat is changed to outdoor
Hot device 300 carries out defrost operation, and indoor temperature will not be impacted, and will not make indoor heat exchanger due to expanding with heat and contract with cold simultaneously
Produce abnormal sound, increase air-conditioner service life.
Further, by-pass line 700 is provided with the first bypass cock valve 710.Bypass throttling arrangement when needing coolant
When, the first bypass cock valve 710 can be opened, make the high temperature refrigerant that compressor 100 exports enter to enter the room by by-pass line 700
In external heat exchanger 300.When air-conditioner normally heat or refrigeration mode under, the first bypass cock valve 710 need to cut out, make cold
Matchmaker can carry out reducing pressure by regulating flow by throttling arrangement 400.
Specifically, in the first embodiment of air-conditioning of the present invention, one end of by-pass line 700 connects heat exchange indoors
Between device 500 and throttling arrangement 400, the other end of by-pass line 700 be connected to outdoor heat exchanger 300 and throttling arrangement 400 it
Between.When by-pass line 700 is in above-mentioned connected mode, in defrost mode, the high temperature refrigerant of compressor 100 output is advanced enters the room
In interior heat exchanger 500, interior is carried out with normal heat exchange, keep indoor temperature, then again outdoor is entered by by-pass line 700
Heat exchanger 300 carries out defrosting operation.In the present embodiment, can also keep under defrosting mode to indoor heating mode, no
Indoor temperature can be had any impact, but in this embodiment, in indoor heat exchanger 500, can not there is capillary tube shunting
Etc. the device that can produce reducing pressure by regulating flow effect.In the present embodiment, in order to improve the defrost effect to outdoor heat exchanger 300
Rate, when starting defrost, can reduce the rotating speed of the heat exchange blower fan in indoor heat exchanger 500 and outdoor heat exchanger 300, or will
Heat exchange blower fan is closed down, and so that indoor heat exchanger 500 and the external heat exchange efficiency of outdoor heat exchanger 300 is reduced it is ensured that compressor 100 produces
Raw heat can concentrate on outdoor heat exchanger 300 and defrost.
Shown in Figure 2, the second embodiment of air-conditioner of the present invention compares presence one with the first embodiment
In place of difference: the entrance point of throttling arrangement 400 is provided with the second bypass cock valve 720.When defrosting mode starts, by second
Logical switch valve 720 cuts out, and high temperature refrigerant can be avoided to enter throttling arrangement 400, causes the coolant after reducing pressure by regulating flow to enter outdoor
Heat exchanger 300.Certainly, the second bypass cock valve 720 can also be arranged on the port of export of throttling arrangement 400.
Shown in Figure 3, the main region that the third embodiment of air-conditioner of the present invention is existed with the first embodiment
It is not that the position that by-pass line 700 connects in systems is different from the first embodiment.Specifically, the one of by-pass line 700
End is connected between cross valve 200 and indoor heat exchanger 500, the other end of by-pass line 700 be connected to outdoor heat exchanger 300 with
Between throttling arrangement 400.When by-pass line 700 is in above-mentioned connected mode, in defrost mode, the height of compressor 100 output
Warm coolant bypasses indoor heat exchanger 500 and throttling arrangement 400 through by-pass line 700 simultaneously, subsequently into outdoor heat exchanger 300
Carry out defrosting operation.Under this embodiment, the high temperature refrigerant of compressor 100 output will not heat exchange indoors, and directly right
Outdoor heat exchanger 300 carries out heat release defrosting, and defrosting efficiency is higher.And under this defrosting mode, indoor heat exchanger can be closed
500 heat exchange blower fan, relies on the high temperature refrigerant of storage in indoor heat exchanger 500, to indoor radiating, Ke Yi in the way of radiating
The short time less impact to indoor temperature；The rotating speed of heat exchange blower fan in outdoor heat exchanger 300 can also be reduced simultaneously, or will
It is closed down, and reduces scattering and disappearing it is ensured that the heat of compressor 100 generation can concentrate on outdoor heat exchanger 300 and be defrosted of heat.
Shown in Figure 4, the 4th kind of embodiment of air-conditioner of the present invention compares presence one with the third embodiment
In place of difference: the entrance point of indoor heat exchanger 500 is provided with the 3rd bypass cock valve 730.When defrosting mode starts, by the 3rd
Bypass cock valve 730 cuts out, and high temperature refrigerant can be avoided to enter throttling arrangement 400, cause the coolant after reducing pressure by regulating flow to enter to enter the room
External heat exchanger 300.Certainly, the 3rd bypass cock valve 730 can also be disposed in the interior the port of export or the throttling arrangement of heat exchanger 500
400 port of export.
Specifically, throttling arrangement 400 is the tandem compound of electric expansion valve, capillary tube or electric expansion valve and capillary tube；
The first bypass cock valve 710 in above-mentioned several embodiments, the second bypass cock valve 720 and the 3rd bypass cock valve 730 are
Electromagnetic valve.
In addition to embodiment of above, also there is the control that other embodiment can realize coolant is flowed to, for example
Select valve in the junction setting of by-pass line 700 and refrigerant pipe 600, to replace by the first bypass cock valve 710, second
Logical switch valve 720 and the 3rd bypass cock valve 730.
Embodiment described above only have expressed the several embodiments of the present invention, and its description is more concrete and detailed, but simultaneously
Therefore the restriction to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, some deformation can also be made and improve, these broadly fall into the guarantor of the present invention
Shield scope.Therefore, the protection domain of patent of the present invention should be defined by claims.
Claims (12)
1. a kind of air-conditioner, including compressor (100), cross valve (200), outdoor heat exchanger (300), throttling arrangement (400), room
Interior heat exchanger (500) and refrigerant pipe (600), described compressor (100), outdoor heat exchanger (300), throttling arrangement (400) and
Indoor heat exchanger (500) is sequentially communicated it is characterised in that also including by-pass line (700) by refrigerant pipe (600), described
The two ends of by-pass line (700) are connected with refrigerant pipe (600) respectively, and by-pass line (700) can make refrigerant pipe
(600) coolant in bypasses throttling arrangement (400) and enters outdoor heat exchanger (300).
2. air-conditioner according to claim 1 is it is characterised in that be provided with the first bypass on described by-pass line (700)
Switch valve (710).
3. air-conditioner according to claim 1 and 2 is it is characterised in that one end of described by-pass line (700) is connected to room
Between interior heat exchanger (500) and throttling arrangement (400), the other end of by-pass line (700) be connected to outdoor heat exchanger (300) with
Between throttling arrangement (400).
4. air-conditioner according to claim 3 is it is characterised in that the entrance point of described throttling arrangement (400) or the port of export
It is provided with the second bypass cock valve (720).
5. air-conditioner according to claim 1 and 2 is it is characterised in that one end of described by-pass line (700) is connected to four
Between port valve (200) and indoor heat exchanger (500), the other end of by-pass line (700) is connected to outdoor heat exchanger (300) and section
Between stream device (400).
6. air-conditioner according to claim 5 is it is characterised in that the entrance point of described indoor heat exchanger (500) or outlet
End, or the port of export of throttling arrangement is provided with the 3rd bypass cock valve (730).
7. air-conditioner according to claim 1 is it is characterised in that described throttling arrangement (400) is electric expansion valve, capillary
Pipe or the tandem compound of electric expansion valve and capillary tube.
8. a kind of air-conditioner bypass heating and defrosting control method is it is characterised in that described air-conditioner is that claim 1 to 7 is arbitrary
Described air-conditioner, when the defrost starts, described cross valve (200) is air conditioner heat-production pattern, described compressor (100) output
High temperature refrigerant by by-pass line (700) bypass throttling arrangement (400) enter outdoor heat exchanger (300), high temperature refrigerant is to institute
State after outdoor heat exchanger (300) carries out defrost and return compressor (100).
9. defrosting control method according to claim 8 is it is characterised in that the high temperature that exports of described compressor (100) is cold
Matchmaker bypasses throttling arrangement (400) entrance outdoor heat exchanger after indoor heat exchanger (500), then by by-pass line (700)
(300).
10. defrosting control method according to claim 8 is it is characterised in that the high temperature that exports of described compressor (100) is cold
Matchmaker bypasses indoor heat exchanger (500) by by-pass line (700) and throttling arrangement (400) enters outdoor heat exchanger (300).
11. defrosting control methods according to claim 8 it is characterised in that when the defrost starts, reduce indoor heat exchanger
(500) and outdoor heat exchanger (300) external heat exchange.
12. defrosting control methods according to claim 11 it is characterised in that when the defrost starts, reduce indoor heat exchange
The rotating speed of heat exchange blower fan in device (500) and outdoor heat exchanger (300) or closed down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610700956.1A CN106352629A (en) | 2016-08-22 | 2016-08-22 | Air conditioner and bypass heating defrosting control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610700956.1A CN106352629A (en) | 2016-08-22 | 2016-08-22 | Air conditioner and bypass heating defrosting control method thereof |
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| CN106352629A true CN106352629A (en) | 2017-01-25 |
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| CN201610700956.1A Pending CN106352629A (en) | 2016-08-22 | 2016-08-22 | Air conditioner and bypass heating defrosting control method thereof |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108253565A (en) * | 2018-01-03 | 2018-07-06 | 广东美的制冷设备有限公司 | Air conditioner and its control method and control device |
| CN109386982A (en) * | 2018-09-27 | 2019-02-26 | 珠海格力电器股份有限公司 | Air conditioner and its control method |
| CN109442788A (en) * | 2018-10-08 | 2019-03-08 | 珠海格力电器股份有限公司 | The defrosting method and air-conditioning of air-conditioning |
| CN110736216A (en) * | 2019-09-27 | 2020-01-31 | 青岛海尔空调器有限总公司 | Control method and control device for defrosting of air conditioner and air conditioner |
| CN110836452A (en) * | 2018-08-17 | 2020-02-25 | 青岛海尔空调器有限总公司 | Defrosting control method for air conditioner |
| CN110836471A (en) * | 2018-08-17 | 2020-02-25 | 青岛海尔空调器有限总公司 | Defrosting control method for fixed-frequency air conditioner |
| CN110836477A (en) * | 2018-08-17 | 2020-02-25 | 青岛海尔空调器有限总公司 | Defrosting control method for fixed-frequency air conditioner |
| CN110940055A (en) * | 2019-12-16 | 2020-03-31 | 宁波奥克斯电气股份有限公司 | Heating and defrosting control method and device for air conditioner and air conditioner |
| CN111059700A (en) * | 2019-12-24 | 2020-04-24 | 珠海格力电器股份有限公司 | Air conditioner defrosting control method and device and air conditioner |
| CN111473556A (en) * | 2019-01-24 | 2020-07-31 | 新奥数能科技有限公司 | Defrosting method for air source low-temperature heat pump unit |
| CN111637656A (en) * | 2019-03-01 | 2020-09-08 | 珠海格力电器股份有限公司 | Air conditioner and control method |
| WO2020215787A1 (en) * | 2019-04-26 | 2020-10-29 | 珠海格力电器股份有限公司 | Control method for heat pump system |
| CN112229116A (en) * | 2020-10-15 | 2021-01-15 | 珠海格力电器股份有限公司 | Air source heat pump unit defrosting control method and device and air conditioning system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108253565A (en) * | 2018-01-03 | 2018-07-06 | 广东美的制冷设备有限公司 | Air conditioner and its control method and control device |
| CN108253565B (en) * | 2018-01-03 | 2020-07-28 | 广东美的制冷设备有限公司 | Air conditioner and control method and control device thereof |
| CN110836452A (en) * | 2018-08-17 | 2020-02-25 | 青岛海尔空调器有限总公司 | Defrosting control method for air conditioner |
| CN110836471A (en) * | 2018-08-17 | 2020-02-25 | 青岛海尔空调器有限总公司 | Defrosting control method for fixed-frequency air conditioner |
| CN110836477A (en) * | 2018-08-17 | 2020-02-25 | 青岛海尔空调器有限总公司 | Defrosting control method for fixed-frequency air conditioner |
| CN109386982A (en) * | 2018-09-27 | 2019-02-26 | 珠海格力电器股份有限公司 | Air conditioner and its control method |
| CN109386982B (en) * | 2018-09-27 | 2020-06-12 | 珠海格力电器股份有限公司 | Air conditioner and control method thereof |
| CN109442788A (en) * | 2018-10-08 | 2019-03-08 | 珠海格力电器股份有限公司 | The defrosting method and air-conditioning of air-conditioning |
| CN109442788B (en) * | 2018-10-08 | 2021-02-23 | 珠海格力电器股份有限公司 | Defrosting method of air conditioner and air conditioner |
| CN111473556A (en) * | 2019-01-24 | 2020-07-31 | 新奥数能科技有限公司 | Defrosting method for air source low-temperature heat pump unit |
| CN111473556B (en) * | 2019-01-24 | 2021-12-31 | 新奥数能科技有限公司 | Defrosting method for air source low-temperature heat pump unit |
| CN111637656A (en) * | 2019-03-01 | 2020-09-08 | 珠海格力电器股份有限公司 | Air conditioner and control method |
| WO2020215787A1 (en) * | 2019-04-26 | 2020-10-29 | 珠海格力电器股份有限公司 | Control method for heat pump system |
| CN110736216A (en) * | 2019-09-27 | 2020-01-31 | 青岛海尔空调器有限总公司 | Control method and control device for defrosting of air conditioner and air conditioner |
| CN110940055A (en) * | 2019-12-16 | 2020-03-31 | 宁波奥克斯电气股份有限公司 | Heating and defrosting control method and device for air conditioner and air conditioner |
| CN111059700A (en) * | 2019-12-24 | 2020-04-24 | 珠海格力电器股份有限公司 | Air conditioner defrosting control method and device and air conditioner |
| CN111059700B (en) * | 2019-12-24 | 2021-01-15 | 珠海格力电器股份有限公司 | Air conditioner defrosting control method and device and air conditioner |
| CN112229116A (en) * | 2020-10-15 | 2021-01-15 | 珠海格力电器股份有限公司 | Air source heat pump unit defrosting control method and device and air conditioning system |
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Application publication date: 20170125 |