CN105066255A - Air conditioning system with continuous heat supply function in defrosting process - Google Patents

Air conditioning system with continuous heat supply function in defrosting process Download PDF

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Publication number
CN105066255A
CN105066255A CN201510555615.5A CN201510555615A CN105066255A CN 105066255 A CN105066255 A CN 105066255A CN 201510555615 A CN201510555615 A CN 201510555615A CN 105066255 A CN105066255 A CN 105066255A
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CN
China
Prior art keywords
heat exchanger
air
conditioning
defrost
port valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201510555615.5A
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Chinese (zh)
Inventor
李大伟
罗永前
魏广飞
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gree Electric Appliances Inc of Zhuhai
Original Assignee
Gree Electric Appliances Inc of Zhuhai
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gree Electric Appliances Inc of Zhuhai filed Critical Gree Electric Appliances Inc of Zhuhai
Priority to CN201510555615.5A priority Critical patent/CN105066255A/en
Publication of CN105066255A publication Critical patent/CN105066255A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0003Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/14Heat exchangers specially adapted for separate outdoor units
    • F24F1/16Arrangement or mounting thereof
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/38Fan details of outdoor units, e.g. bell-mouth shaped inlets or fan mountings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/30Arrangement or mounting of heat-exchangers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/20Disposition of valves, e.g. of on-off valves or flow control valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/30Expansion means; Dispositions thereof
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02Defrosting cycles

Abstract

The invention discloses an air conditioning system with the continuous heat supply function in the defrosting process. The air conditioning system comprises an outdoor heat exchanger. The rear end of the outdoor heat exchanger is sequentially connected with a second throttling device and an auxiliary heat exchanger in series. The second throttling device and the auxiliary heat exchanger are connected in series and then connected with second two-way valves in parallel. The second two-way valves form a second bypass branch. A first throttling valve and the outdoor heat exchanger are connected in series. The two ends of the first throttling device are connected with first two-way valves in parallel, and the first two-way valves form a first bypass branch. The air conditioning system is provided with an auxiliary heat exchanger and an auxiliary draught fan. When a defrosting program operates, the outdoor heat exchanger conducts defrosting operation, the auxiliary heat exchanger serves as an evaporator, the heating function of an air conditioner is achieved, and therefore it is guaranteed that the air conditioner can continuously supply heat in the defrosting process, the experience of a user is better when the user uses the air conditioner in winter, and the market competitiveness of products is enhanced.

Description

There is in a kind of defrost process the air-conditioning system of lasting heat supply function
Technical field
The present invention relates to air-conditioning system field, disclose a kind of air-conditioning system that can continue heat supply in air-conditioner defrosting process more specifically.
Background technology
Existing heat supply Defrost technology, the temperature in defrost process in absorption chamber, forms reverse circulation (namely indoor become refrigerating environment), causes indoor environment to fluctuate, poor user experience.
Even if adopt newer defrost control system, be also merely able to ensure not absorb heat in environment indoor in air-conditioning heating process, but the heat supply that continues cannot be realized, the requirement of user to air-conditioning winter refrigeration can not be met.
Therefore, a kind of air-conditioning system that can continue heat supply in air-conditioner defrosting process is needed in market badly, and to ensure air-conditioning in the winter time in heating and defrosting process, indoor temperature is by the impact of defrost process.
Summary of the invention
One object of the present invention is, proposes the air-conditioning system in a kind of defrost process with lasting heat supply function, and decline to solve indoor set leaving air temp in the air-conditioner defrosting process that exists in prior art, indoor temperature reduces, the problem of poor user experience.
For reaching this object, the present invention by the following technical solutions:
There is in a kind of defrost process the air-conditioning system of lasting heat supply function, comprise outdoor heat exchanger, connect the second throttling arrangement, supplementary heat exchanger successively in the rear end of described outdoor heat exchanger, described second throttling arrangement and supplementary heat exchanger are in parallel with the second two-port valve after connecting, and described second two-port valve forms the second bypass branch;
First throttle device is connected with described outdoor heat exchanger, and two ends first two-port valve in parallel of described first throttle device, described first two-port valve forms the first bypass branch.
Further, the outlet side of compressor is connected to after indoor heat exchanger through four-way change-over valve, series connection first throttle device, outdoor heat exchanger, the second throttling arrangement, supplementary heat exchanger, be then connected to the suction end of described compressor by described four-way change-over valve successively.
Further, comprise and heat path and defrosting path, the refrigerant in described defrosting path from the outlet side of compressor out after get back to the suction end of described compressor successively through indoor heat exchanger, outdoor heat exchanger, the second throttling arrangement, supplementary heat exchanger;
In defrost process, enter into described outdoor heat exchanger from described indoor heat exchanger high temperature refrigerant out without throttling arrangement, refrigerant heat release defrosts to described outdoor heat exchanger, and then refrigerant enters into supplementary heat exchanger evaporation endothermic through throttling arrangement.
Further, heat described in the refrigerant in path from the outlet side of compressor out after get back to the suction end of described compressor successively through indoor heat exchanger, first throttle device, outdoor heat exchanger.
Further, during described defrosting path work, described supplementary heat exchanger, the first two-port valve, the second throttling arrangement are opened;
Described first throttle device, the second two-port valve are closed.
Further, described in heat path work time, described first throttle device, second two-port valve open;
Described supplementary heat exchanger, the first two-port valve, the second throttling arrangement are closed.
Preferably, also comprise check valve, described check valve, supplementary heat exchanger, the second throttling arrangement are in parallel with described second two-port valve after connecting successively.
Preferably, described first throttle device and the second throttling arrangement are electric expansion valve, capillary or heating power expansion valve.
Preferably, described first two-port valve and the second two-port valve are electronics two-port valve.
Further, also comprise accessory fan, described accessory fan and described supplementary heat exchanger with the use of.
Beneficial effect of the present invention is: the air-conditioning system in the present invention arranges supplementary heat exchanger and accessory fan, when defrosting program is run, outdoor heat exchanger defrosts, supplementary heat exchanger serves as evaporimeter, realize air-conditioning heating function, thus ensure that air-conditioning can continue heat supply in defrost process, make user in the winter time using air-condition time experience better, enhance the competitiveness of product in market.
Accompanying drawing explanation
Fig. 1 is the johning knot composition in the defrost process of specific embodiment of the invention proposition with the air-conditioning system of lasting heat supply function;
Fig. 2 is that the air-conditioning system having a lasting heat supply function in the defrost process that proposes of the specific embodiment of the invention heats refrigerant in path and moves towards schematic diagram;
Fig. 3 be the specific embodiment of the invention propose defrost process in have lasting heat supply function air-conditioning system defrosting path in refrigerant move towards schematic diagram.
In figure:
1, compressor; 2, fluid reservoir; 3, four-way change-over valve; 4, indoor heat exchanger; 5, indoor fan; 6, outdoor heat exchanger; 7, outdoor fan; 8, supplementary heat exchanger; 9, accessory fan; 10, the first electric expansion valve; 11, the first electronics two-port valve; 12, the second electric expansion valve; 13, the second electronics two-port valve; 14, check valve.
Detailed description of the invention
Technical scheme of the present invention is further illustrated by detailed description of the invention below in conjunction with accompanying drawing.
The present invention proposes in a kind of defrost process the air-conditioning system with lasting heat supply function, in existing air-conditioning system, to connect successively in the rear end of outdoor heat exchanger the second throttling arrangement, supplementary heat exchanger, second throttling arrangement and supplementary heat exchanger are in parallel with the second two-port valve after connecting, and described second two-port valve forms the second bypass branch; First throttle device is connected with described outdoor heat exchanger, and two ends first two-port valve in parallel of described first throttle device, described first two-port valve forms the first bypass branch.Whole air-conditioning system can be divided into and heat path and defrosting path, the refrigerant in defrosting path from the outlet side of compressor out after get back to the suction end of compressor successively through indoor heat exchanger, outdoor heat exchanger, throttling arrangement, supplementary heat exchanger.
In defrost process, heat exchanger high temperature refrigerant out enters into outdoor heat exchanger without throttling arrangement indoor, and refrigerant heat release defrosts to outdoor heat exchanger, and then refrigerant enters into supplementary heat exchanger evaporation endothermic through throttling arrangement.Outdoor heat exchanger defrosts in above process, and supplementary heat exchanger uses as evaporimeter, and refrigerant carries out evaporation and heat-exchange wherein.
Heat the refrigerant in path from the outlet side of compressor out after get back to the suction end of compressor successively through indoor heat exchanger, throttling arrangement, outdoor heat exchanger.
Air-conditioning system in the present invention arranges supplementary heat exchanger and accessory fan, when defrosting program is run, outdoor heat exchanger defrosts, supplementary heat exchanger serves as evaporimeter, realize air-conditioning heating function, thus ensure that air-conditioning can continue heat supply in defrost process, make user in the winter time using air-condition time experience better, enhance the competitiveness of product in market.
Embodiment one
As shown in Figure 1, be, in a kind of defrost process of proposing of the present embodiment, there is the concrete syndeton of the air-conditioning system of lasting heat supply function.This air-conditioning system comprises compressor 1 and fluid reservoir 2, and fluid reservoir 2 is connected with compressor 1, can arrange the separating component that gas-liquid separator, oil-liquid separator etc. are necessary between the two.
In the present embodiment, the concrete syndeton of air-conditioning system is, the outlet side of compressor 1 is connected to after indoor heat exchanger 4 through four-way change-over valve 3, series connection first throttle device, outdoor heat exchanger 6, second throttling arrangement, supplementary heat exchanger 8, be then connected to the suction end of compressor 1 by four-way change-over valve 3 successively.Wherein, the first throttle device in the present embodiment is the first electric expansion valve 10, second throttling arrangement is the second electric expansion valve 12.
As further embodiment, the two ends of the first electric expansion valve 10 be arranged in parallel the first electronics two-port valve 11, second electric expansion valve 12 and supplementary heat exchanger 8 connect after in parallel with the second electronics two-port valve 13.Also include check valve 14 in the present embodiment, check valve 14, supplementary heat exchanger 8, second electric expansion valve 12 are in parallel with the second electronics two-port valve 13 after connecting successively.Meanwhile, indoor heat exchanger 4 is provided with indoor fan 5, outdoor heat exchanger 6 is provided with outdoor fan 7, supplementary heat exchanger 8 is provided with accessory fan 9, the better heat exchange of blower fan supplementary heat exchanger on each position.
As shown in Figure 3, when using said structure to carry out defrosting work, defrosting path is run, and now supplementary heat exchanger 8, accessory fan 9, first electronics two-port valve 11, second electric expansion valve 12 are opened; First electric expansion valve 10, second electronics two-port valve 13 cuts out.Refrigerant from compressor 1 gas outlet out, is got back in compressor 1 through four-way change-over valve 3, indoor heat exchanger 4, first electronics two-port valve 11, outdoor heat exchanger 6, second electric expansion valve 12, supplementary heat exchanger 8, check valve 14, four-way change-over valve 3 successively.In this process, outdoor heat exchanger 6 defrosts, and supplementary heat exchanger 8 carries out work as evaporimeter.
As shown in Figure 2, when using said structure to heat, heat path and run, the first electric expansion valve 10, second electronics two-port valve 13 is opened; Supplementary heat exchanger 8, accessory fan 9, first electronics two-port valve 11, second electric expansion valve 12 are closed.Refrigerant from the outlet side of compressor 1 out after get back to compressor 1 through four-way change-over valve 3, indoor heat exchanger 4, first electric expansion valve 10, outdoor heat exchanger 6, second electronics two-port valve 13, four-way change-over valve 3 successively.In this process, supplementary heat exchanger 8 quits work, and outdoor heat exchanger 6 carries out work as evaporimeter.
Throttling arrangement in the present embodiment is not confined to electric expansion valve, can also use the throttle part such as capillary or heating power expansion valve.
Air-conditioning system syndeton in the present embodiment, heating in path and defrosting path integration process, four-way change-over valve does not need to commutate, and can extend the service life of four-way change-over valve to a certain extent.
Embodiment two
The present embodiment is roughly the same with the air-conditioning system syndeton in embodiment one, difference is, in air-conditioning system syndeton in the present embodiment, check valve is not set, makes supplementary heat exchanger under some dislikes the condition of omiting, the effect of evaporation or condensation can be realized by ancillary chamber external heat exchanger.
While stating function in realization, the structure in the present embodiment is identical with the structure in embodiment one, and also can realize in defrost process, indoor heating air-out does not affect by defrost, and can realize the function of not shutting down defrost, Consumer's Experience is better.
Below describe know-why of the present invention in conjunction with specific embodiments, these describe just in order to explain principle of the present invention, can not be interpreted as limiting the scope of the invention by any way.Based on explaining herein, those skilled in the art does not need to pay performing creative labour can associate other detailed description of the invention of the present invention, and these modes all will fall within protection scope of the present invention.

Claims (10)

1. there is in a defrost process air-conditioning system of lasting heat supply function, comprise outdoor heat exchanger (6), it is characterized in that: connect the second throttling arrangement, supplementary heat exchanger (8) successively in the rear end of described outdoor heat exchanger (6), described second throttling arrangement and supplementary heat exchanger (8) are in parallel with the second two-port valve after connecting, and described second two-port valve forms the second bypass branch;
First throttle device is connected with described outdoor heat exchanger (6), and two ends first two-port valve in parallel of described first throttle device, described first two-port valve forms the first bypass branch.
2. there is in defrost process according to claim 1 the air-conditioning system of lasting heat supply function, it is characterized in that: the outlet side of compressor (1) is connected to after indoor heat exchanger (4) through four-way change-over valve (3), series connection first throttle device, outdoor heat exchanger (6), the second throttling arrangement, supplementary heat exchanger (8), be then connected to the suction end of described compressor (1) by described four-way change-over valve (3) successively.
3. there is in defrost process according to claim 1 and 2 the air-conditioning system of lasting heat supply function, it is characterized in that: comprise and heat path and defrosting path, the refrigerant in described defrosting path from the outlet side of compressor (1) out after get back to the suction end of described compressor (1) successively through indoor heat exchanger (4), outdoor heat exchanger (6), the second throttling arrangement, supplementary heat exchanger (8);
In defrost process, described outdoor heat exchanger (6) is entered into without throttling arrangement from described indoor heat exchanger (4) high temperature refrigerant out, refrigerant heat release defrosts to described outdoor heat exchanger (6), and then refrigerant enters into supplementary heat exchanger (8) evaporation endothermic through throttling arrangement.
4. there is in defrost process according to claim 3 the air-conditioning system of lasting heat supply function, it is characterized in that: described in heat the refrigerant in path from the outlet side of compressor (1) out after get back to the suction end of described compressor (1) successively through indoor heat exchanger (4), first throttle device, outdoor heat exchanger (6).
5. have the air-conditioning system of lasting heat supply function in defrost process according to claim 3, it is characterized in that: during described defrosting path work, described supplementary heat exchanger (8), the first two-port valve, the second throttling arrangement are opened;
Described first throttle device, the second two-port valve are closed.
6. there is in defrost process according to claim 3 the air-conditioning system of lasting heat supply function, it is characterized in that: described in heat path work time, described first throttle device, second two-port valve open;
Described supplementary heat exchanger (8), the first two-port valve, the second throttling arrangement are closed.
7. there is in defrost process according to claim 3 the air-conditioning system of lasting heat supply function, it is characterized in that: also comprise check valve (14), described check valve (14), supplementary heat exchanger (8), the second throttling arrangement are in parallel with described second two-port valve after connecting successively.
8. there is in defrost process according to claim 1 and 2 the air-conditioning system of lasting heat supply function, it is characterized in that: described first throttle device and the second throttling arrangement are electric expansion valve, capillary or heating power expansion valve.
9. there is in defrost process according to claim 1 and 2 the air-conditioning system of lasting heat supply function, it is characterized in that: described first two-port valve and the second two-port valve are electronics two-port valve.
10. there is in defrost process according to claim 1 and 2 the air-conditioning system of lasting heat supply function, it is characterized in that: also comprise accessory fan (9), described accessory fan (9) and described supplementary heat exchanger (8) with the use of.
CN201510555615.5A 2015-09-01 2015-09-01 Air conditioning system with continuous heat supply function in defrosting process Pending CN105066255A (en)

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Application Number Priority Date Filing Date Title
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105910175A (en) * 2016-04-29 2016-08-31 珠海格力电器股份有限公司 Air conditioner indoor unit, air conditioner unit and control method of air conditioner unit
CN106052181A (en) * 2016-07-07 2016-10-26 广东美的暖通设备有限公司 Air conditioner system and control method thereof
CN106705217A (en) * 2016-11-30 2017-05-24 美的集团股份有限公司 Control method and system used for improving heating effect of air conditioner and air conditioner
CN107120831A (en) * 2017-05-27 2017-09-01 南京理工大学 A kind of continuous heating air friction drag
CN110173823A (en) * 2019-05-31 2019-08-27 广东美的制冷设备有限公司 Progress control method, control device, air conditioner and computer readable storage medium
CN111895603A (en) * 2020-07-10 2020-11-06 广东纽恩泰新能源科技发展有限公司 Heat pump unit system capable of defrosting without reducing water temperature and control method
CN113218102A (en) * 2021-04-28 2021-08-06 湖南雅立科技开发有限公司 Heat pump system based on three devices and defrosting method thereof

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CN101469926A (en) * 2007-12-29 2009-07-01 苏州三星电子有限公司 Improved air conditioner defrosting system and its control method
CN203375604U (en) * 2013-06-28 2014-01-01 美的集团股份有限公司 Heat pump air conditioner system
KR20140058251A (en) * 2012-11-06 2014-05-14 엘지전자 주식회사 Integral air conditioning system for heating and cooling
CN104515322A (en) * 2013-09-30 2015-04-15 珠海格力电器股份有限公司 Air conditioning system being able to achieve continuous heating
CN205065908U (en) * 2015-09-01 2016-03-02 珠海格力电器股份有限公司 Air conditioning system that defrosting in -process has lasting heat supply function

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101469926A (en) * 2007-12-29 2009-07-01 苏州三星电子有限公司 Improved air conditioner defrosting system and its control method
KR20140058251A (en) * 2012-11-06 2014-05-14 엘지전자 주식회사 Integral air conditioning system for heating and cooling
CN203375604U (en) * 2013-06-28 2014-01-01 美的集团股份有限公司 Heat pump air conditioner system
CN104515322A (en) * 2013-09-30 2015-04-15 珠海格力电器股份有限公司 Air conditioning system being able to achieve continuous heating
CN205065908U (en) * 2015-09-01 2016-03-02 珠海格力电器股份有限公司 Air conditioning system that defrosting in -process has lasting heat supply function

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105910175A (en) * 2016-04-29 2016-08-31 珠海格力电器股份有限公司 Air conditioner indoor unit, air conditioner unit and control method of air conditioner unit
CN105910175B (en) * 2016-04-29 2019-03-26 珠海格力电器股份有限公司 The control method of air conditioner indoor unit, air-conditioner set and air-conditioner set
CN106052181A (en) * 2016-07-07 2016-10-26 广东美的暖通设备有限公司 Air conditioner system and control method thereof
CN106052181B (en) * 2016-07-07 2018-09-07 广东美的暖通设备有限公司 Air-conditioning system and its control method
CN106705217A (en) * 2016-11-30 2017-05-24 美的集团股份有限公司 Control method and system used for improving heating effect of air conditioner and air conditioner
CN107120831A (en) * 2017-05-27 2017-09-01 南京理工大学 A kind of continuous heating air friction drag
CN107120831B (en) * 2017-05-27 2019-07-16 南京理工大学 A kind of continuous heating air friction drag
CN110173823A (en) * 2019-05-31 2019-08-27 广东美的制冷设备有限公司 Progress control method, control device, air conditioner and computer readable storage medium
CN110173823B (en) * 2019-05-31 2021-06-29 广东美的制冷设备有限公司 Operation control method, control device, air conditioner, and computer-readable storage medium
CN111895603A (en) * 2020-07-10 2020-11-06 广东纽恩泰新能源科技发展有限公司 Heat pump unit system capable of defrosting without reducing water temperature and control method
CN113218102A (en) * 2021-04-28 2021-08-06 湖南雅立科技开发有限公司 Heat pump system based on three devices and defrosting method thereof

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Application publication date: 20151118

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