KR20060039338A - Structure for circulating refrigerants in outdoor unit of heat pump cycle - Google Patents

Structure for circulating refrigerants in outdoor unit of heat pump cycle Download PDF

Info

Publication number
KR20060039338A
KR20060039338A KR1020040088482A KR20040088482A KR20060039338A KR 20060039338 A KR20060039338 A KR 20060039338A KR 1020040088482 A KR1020040088482 A KR 1020040088482A KR 20040088482 A KR20040088482 A KR 20040088482A KR 20060039338 A KR20060039338 A KR 20060039338A
Authority
KR
South Korea
Prior art keywords
refrigerant
pipe
heat
heat exchanger
heat pump
Prior art date
Application number
KR1020040088482A
Other languages
Korean (ko)
Inventor
전병우
Original Assignee
주식회사 대우일렉트로닉스
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 주식회사 대우일렉트로닉스 filed Critical 주식회사 대우일렉트로닉스
Priority to KR1020040088482A priority Critical patent/KR20060039338A/en
Publication of KR20060039338A publication Critical patent/KR20060039338A/en

Links

Images

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
    • F25B30/00—Heat pumps
    • F25B30/02—Heat pumps of the compression type
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/40—Fluid line arrangements
    • 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
    • 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
    • F25B2347/00—Details for preventing or removing deposits or corrosion
    • F25B2347/02—Details of defrosting cycles
    • F25B2347/023—Set point defrosting

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air-Conditioning For Vehicles (AREA)

Abstract

본 발명은 내부에 냉매가 흐르면서 열교환되도록 주름지게 구비된 냉매관(10), 상기 냉매관(10) 외주에 구비되어 열전달 면적을 증대시키는 방열핀(20), 상기 냉매관(10)의 입구(10a)에 연결되어 냉매를 순환시키는 냉매유입관(31), 및 상기 냉매관(10)의 출구(10b)에 연결되어 냉매를 순환시키는 냉매유출관(32)을 포함하는 히트펌프 사이클의 냉매순환구조에 있어서, 제상모드시 상기 냉매유입관(31)의 경우 압축기에서 토출된 고온고압의 냉매가 지나게 되는데, 이 고온고압의 냉매를 활용하기 위해 상기 냉매유입관의 일부를 성에가 많이 발생하는 실외열교환기 하단부를 지나도록 설계하여 상기 실외열교환기 하단부의 온도를 상승시키는 것을 특징으로 한다. The present invention provides a refrigerant pipe (10) corrugated to be heat-exchanged as the refrigerant flows therein, a heat dissipation fin (20) provided on the outer circumference of the refrigerant pipe (10) to increase a heat transfer area, and an inlet (10a) of the refrigerant pipe (10). Refrigerant circulation structure of the heat pump cycle comprising a refrigerant inlet pipe 31 connected to the circulating refrigerant and a refrigerant outlet pipe 32 connected to the outlet 10b of the refrigerant pipe 10 to circulate the refrigerant In the defrost mode, in the case of the refrigerant inlet pipe 31, the high temperature and high pressure refrigerant discharged from the compressor passes. In order to utilize the high temperature and high pressure refrigerant, part of the refrigerant inlet tube generates a lot of frost. It is designed to pass through the bottom of the air, characterized in that to increase the temperature of the bottom of the outdoor heat exchanger.

히트펌프, 압축기, 열교환기, 어큐뮬레이터, 냉난방모드, 적상, 적층, 제상Heat Pump, Compressor, Heat Exchanger, Accumulator, Air Conditioning, Dropping, Lamination, Defrost

Description

히트펌프 사이클 실외기의 냉매순환구조{Structure for circulating refrigerants in outdoor unit of heat pump cycle}Structure for circulating refrigerants in outdoor unit of heat pump cycle

도 1은 종래 히트펌프 사이클 실외기의 냉매순환구조를 개략적으로 도시한 구성도.1 is a schematic view showing a refrigerant circulation structure of a conventional heat pump cycle outdoor unit.

도 2는 본 발명에 따른 히트펌프 사이클 실외기의 냉매순환구조를 개략적으로 도시한 구성도.Figure 2 is a schematic diagram showing a refrigerant circulation structure of the heat pump cycle outdoor unit according to the present invention.

* 도면의 주요 부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

10: 냉매관 10a,10b: 입,출구10: refrigerant pipe 10a, 10b: inlet and outlet

20: 방열핀 31: 냉매유입관20: heat radiation fin 31: refrigerant inlet pipe

32: 냉매유출관32: refrigerant outlet pipe

본 발명은 난방운전시 겨울철 외기 온도의 영하로 떨어지는 경우, 실외열교환기에 성에의 착상이 심하여 제상운전이 필요한데, 이 제상운전에 따른 실외열교환기의 적층문제를 해결하여 난방사이클의 효율을 증대시킬 수 있는 히트펌프 사이클 실외기의 냉매순환구조에 관한 것이다. In the present invention, when the heating operation falls to below zero outside temperature in winter, defrosting is necessary due to frost formation in the outdoor heat exchanger, which can increase the efficiency of the heating cycle by solving the lamination problem of the outdoor heat exchanger according to the defrosting operation. And a refrigerant circulation structure of a heat pump cycle outdoor unit.                         

일반적으로 히트펌프 시스템의 냉매 순환 사이클은, 냉매가스를 고온고압의 상태로 응축 압력까지 압축하는 압축기와, 상기 압축기에서 압축된 냉매를 공랭식의 경우 공기에 의한 방열에 의하여 액상으로 응축하는 실외열교환기와, 상기 실외열교환기에서 응축된 고온고압 상태의 액상 냉매를 교축작용에 의하여 저압상태의 기상냉매로 팽창시키는 팽창밸브와, 그리고 상기 팽창밸브에서 팽창된 냉매를 증발시키면서 냉매의 증발 잠열을 이용하여 송풍기에 의하여 송풍되는 공기를 열교환에 의하여 냉각함과 아울러 상기 압축기로 냉매가스를 복귀시키는 실내열교환기로 이루어진다.In general, a refrigerant circulation cycle of a heat pump system includes a compressor for compressing a refrigerant gas to a condensation pressure in a state of high temperature and high pressure, and an outdoor heat exchanger for condensing the refrigerant compressed in the compressor to a liquid phase by heat dissipation by air in the case of air cooling. And an expansion valve for expanding the liquid refrigerant in the high temperature and high pressure state condensed in the outdoor heat exchanger into gaseous refrigerant in the low pressure state by the throttling action, and a blower using the latent heat of evaporation of the refrigerant while evaporating the refrigerant expanded in the expansion valve. An indoor heat exchanger cools the air blown by the heat exchanger and returns the refrigerant gas to the compressor.

이러한 히트펌프 시스템은, 냉매 순환 사이클 동안 상기 냉매가 기체→액체 및 액체→기체로 연속적으로 상태변화하며, 난방 및 냉방 운전의 전환을 사방변으로 전환하는 시스템으로 히트펌프류는 난방열원으로서 고온의 열원을 만드는 시스템이다.The heat pump system is a system in which the refrigerant continuously changes state from gas to liquid and liquid to gas during a refrigerant circulation cycle, and the heating and cooling operation is switched to all directions. The heat pump is a hot heat source as a heating heat source. Is a system that creates.

도 1은 종래 히트펌프 사이클 실외기의 냉매순환구조를 개략적으로 도시한 구성도이다. 1 is a configuration diagram schematically showing a refrigerant circulation structure of a conventional heat pump cycle outdoor unit.

도시된 바와 같이, 종래 히트펌프 사이클의 실외기는 내부에 냉매가 흐르면서 열교환되도록 주름지게 구비된 냉매관(10), 상기 냉매관(10) 외주에 구비되어 열전달 면적을 증대시키는 방열핀(20), 및 상기 냉매관(10)의 입,출구에 각각 연결되어 냉매를 순환시키는 냉매유입관(31)과 냉매유출관(32)으로 구성된다. 여기서, 압축기, 어큐뮬레이터, 사방밸브 등의 구성은 일반적인 구성이므로 생략한다. As shown, the outdoor unit of the conventional heat pump cycle is provided with a refrigerant pipe 10 corrugated so as to exchange heat as the refrigerant flows therein, a heat radiation fin 20 provided on the outer periphery of the refrigerant pipe 10 to increase the heat transfer area, and It is composed of a refrigerant inlet pipe 31 and the refrigerant outlet pipe 32 connected to the inlet and outlet of the refrigerant pipe 10 to circulate the refrigerant. Here, the configuration of the compressor, the accumulator, the four-way valve and the like are omitted because they are general configurations.

한편, 통상 히터펌프 시스템은 난방모드에서 실외온도가 -5℃이하로 내려가 게 되면 실외열교환기가 얼어 붙게 되므로서, 실내난방 능력이 현저히 떨어지게 되는 문제점이 있었다. 이러한 이유로, 히터펌프 공기조화기는 난방모드 중에 실외열교환기가 얼지 않도록 일정 주기로 사이클을 역으로 전환시키는 제상모드를 반드시 실시하게 된다. 이 경우, 제상모드시 압축기에서 토출된 냉매가 냉매유입관(31)으로 유입되고, 이후 주름진 냉매관(10)을 통과하면서 열교환된 후 냉매유출관(32)을 통해 다시 실내열교환기로 순환하면서 제상기능을 수행하게 된다. On the other hand, in the conventional heater pump system, when the outdoor temperature is lowered below -5 ℃ in the heating mode, the outdoor heat exchanger is frozen, there was a problem that the indoor heating capacity is significantly reduced. For this reason, the heater pump air conditioner necessarily implements a defrost mode that reverses the cycle at regular intervals so that the outdoor heat exchanger does not freeze during the heating mode. In this case, the refrigerant discharged from the compressor in the defrost mode flows into the refrigerant inlet pipe 31, and then heat exchanges while passing through the corrugated refrigerant pipe 10, and then circulates through the refrigerant outlet pipe 32 again to the indoor heat exchanger. It will perform the function.

하지만, 히트펌프 사이클의 장시간 운전시 제상운전에 따른 적층문제를 근본적으로 해결하지 못해 난방사이클의 효율이 감소되는 문제점이 있었다.However, there is a problem in that the efficiency of the heating cycle is reduced because it does not fundamentally solve the lamination problem due to the defrosting operation during long time operation of the heat pump cycle.

본 발명은 상기와 같은 점을 감안하여 안출된 것으로, 히터펌프 시스템의 냉매순환구조를 변경함으로써, 장시간 운전시에도 실외열교환기 하단부의 온도를 상승시켜 성에의 착상을 방지할 수 있는 히트펌프 사이클 실외기의 냉매순환구조를 제공하는데 그 목적이 있다. The present invention has been made in view of the above-mentioned, by changing the refrigerant circulation structure of the heater pump system, the heat pump cycle outdoor unit that can prevent frost formation by raising the temperature of the lower end of the outdoor heat exchanger even during long time operation The purpose is to provide a refrigerant circulation structure of.

상기와 같은 목적을 달성하기 위하여, 본 발명은 내부에 냉매가 흐르면서 열교환되도록 주름지게 구비된 냉매관(10), 상기 냉매관(10) 외주에 구비되어 열전달 면적을 증대시키는 방열핀(20), 상기 냉매관(10)의 입구(10a)에 연결되어 냉매를 순환시키는 냉매유입관(31), 및 상기 냉매관(10)의 출구(10b)에 연결되어 냉매를 순환시키는 냉매유출관(32)을 포함하는 히트펌프 사이클의 냉매순환구조에 있어서, 제상모드시 상기 냉매유입관(31)의 경우 압축기에서 토출된 고온고압의 냉매가 지 나게 되는데, 이 고온고압의 냉매를 활용하기 위해 상기 냉매유입관의 일부를 성에가 많이 발생하는 실외열교환기 하단부를 지나도록 설계하여 상기 실외열교환기 하단부의 온도를 상승시키는 것을 특징으로 한다.
In order to achieve the above object, the present invention is a heat dissipation fin 20, which is provided on the outer circumference of the refrigerant pipe 10, the refrigerant pipe 10 is provided to be corrugated so as to exchange heat as the refrigerant flows therein, A refrigerant inlet pipe (31) connected to the inlet (10a) of the refrigerant pipe (10) to circulate the refrigerant, and a refrigerant outlet pipe (32) connected to the outlet (10b) of the refrigerant pipe (10) to circulate the refrigerant; In the refrigerant circulation structure of the heat pump cycle including, in the defrost mode, the refrigerant inlet pipe 31 passes through the high temperature and high pressure refrigerant discharged from the compressor, the refrigerant inlet pipe to utilize the high temperature and high pressure refrigerant Part of the design is to pass through the lower end of the outdoor heat exchanger frost is generated, characterized in that to increase the temperature of the lower end of the outdoor heat exchanger.

이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시예에 따른 히트펌프 사이클 실외기의 냉매순환구조를 상세하게 설명한다.Hereinafter, the refrigerant circulation structure of the heat pump cycle outdoor unit according to a preferred embodiment of the present invention with reference to the accompanying drawings will be described in detail.

도 2는 본 발명에 따른 히트펌프 사이클 실외기의 냉매순환구조를 개략적으로 도시한 구성도이다. 2 is a configuration diagram schematically showing a refrigerant circulation structure of the heat pump cycle outdoor unit according to the present invention.

도시된 바와 같이, 본 발명은 내부에 냉매가 흐르면서 열교환되도록 주름지게 구비된 냉매관(10), 상기 냉매관(10) 외주에 구비되어 열전달 면적을 증대시키는 방열핀(20), 상기 냉매관(10)의 입구(10a)에 연결되어 냉매를 순환시키는 냉매유입관(31), 상기 냉매관(10)의 출구(10b)에 연결되어 냉매를 순환시키는 냉매유출관(32)으로 구성된다. 여기서, 압축기, 어큐뮬레이터, 사방밸브 등의 구성은 일반적인 구성이므로 생략한다. As shown, the present invention is a refrigerant pipe 10 is provided to be corrugated so as to exchange heat as the refrigerant flows therein, the heat radiation fin 20, which is provided on the outer periphery of the refrigerant pipe 10 to increase the heat transfer area, the refrigerant pipe 10 Refrigerant inlet pipe 31 is connected to the inlet (10a) of circulating the refrigerant and refrigerant outlet pipe (32) connected to the outlet (10b) of the refrigerant pipe 10 to circulate the refrigerant. Here, the configuration of the compressor, the accumulator, the four-way valve and the like are omitted because they are general configurations.

한편, 제상모드시 상기 냉매유입관(31)의 경우 압축기(미도시)에서 토출된 뜨거운 냉매가 지나게 되는데, 이 뜨거운 냉매를 활용하기 위해 상기 냉매유입관(31)의 일부를 성에가 많이 발생하는 실외열교환기 하단부를 지나도록 설계하여 상기 실외열교환기 하단부의 온도를 상승시키게 된다. Meanwhile, in the defrost mode, in the case of the refrigerant inlet pipe 31, a hot refrigerant discharged from a compressor (not shown) passes. A part of the refrigerant inlet tube 31 generates frost in order to utilize the hot refrigerant. Designed to pass through the bottom of the outdoor heat exchanger to increase the temperature of the bottom of the outdoor heat exchanger.

이러한 구성으로, 난방운전시 실내열교환기(미도시)를 통과한 뜨거운 냉매가 냉매유입관(31)으로 유입되고, 상기 냉매유입관(31)이 실외열교환기의 하단부를 통 과하면서 상기 실외열교환기 하단부에 착상된 성에를 제거하게 된다. In this configuration, the hot refrigerant passing through the indoor heat exchanger (not shown) during the heating operation flows into the refrigerant inlet pipe 31, and the refrigerant inlet pipe 31 passes through the lower end of the outdoor heat exchanger while the outdoor heat exchange is performed. This will remove the frost on the bottom of the machine.

이후, 실외열교환기의 입구(10a)로 냉매가 유입되어 주름진 냉매관(20)을 통과하면서 열교환된 후 냉매유출관(32)을 통해 다시 실내열교환기로 순환하면서 제상기능을 수행하게 된다. Thereafter, the refrigerant flows into the inlet 10a of the outdoor heat exchanger and is heat-exchanged while passing through the corrugated refrigerant tube 20, and then circulates again through the refrigerant outlet tube 32 to the indoor heat exchanger to perform a defrost function.

따라서, 본 발명의 히터펌프 사이클 실외기의 경우, 제상운전시 적층문제로 실외열교환기가 얼지 않기 때문에, 실내난방 능력이 현저히 향상된다. Therefore, in the heater pump cycle outdoor unit of the present invention, since the outdoor heat exchanger does not freeze due to lamination problems during the defrosting operation, the indoor heating capability is remarkably improved.

결론적으로, 히터펌프 시스템의 냉매순환구조를 변경함으로써, 실외열교환기 하단부의 온도를 상승시켜 성에의 착상을 미연에 방지할 수 있다. In conclusion, by changing the refrigerant circulation structure of the heater pump system, it is possible to prevent the frost formation in advance by increasing the temperature of the lower end of the outdoor heat exchanger.

상기된 바와 같은 본 발명은 겨울철 외기 온도의 저하시 제상운전시 실외열교환기에 성에가 착상되는 현상을 미연에 방지할 수 있는 효과가 있다. The present invention as described above has an effect that can prevent the phenomenon that the frost on the outdoor heat exchanger during the defrosting operation in the winter when the outdoor air temperature is lowered.

이상에서는, 본 발명을 특정의 바람직한 실시예에 대해서 도시하고 설명하였다. 그러나, 본 발명은 상술한 실시예에만 한정되는 것은 아니며, 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자라면 이하의 특허청구범위에 기재된 본 발명의 기술적 사상의 요지를 벗어남이 없이 얼마든지 다양하게 변경실시할 수 있을 것이다.In the above, the present invention has been illustrated and described with respect to certain preferred embodiments. However, the present invention is not limited only to the above-described embodiments, and those skilled in the art to which the present invention pertains may vary without departing from the spirit of the technical idea of the present invention described in the claims below. It may be changed.

Claims (1)

내부에 냉매가 흐르면서 열교환되도록 주름지게 구비된 냉매관, 상기 냉매관 외주에 구비되어 열전달 면적을 증대시키는 방열핀, 상기 냉매관의 입구에 연결되어 냉매를 순환시키는 냉매유입관, 및 상기 냉매관의 출구에 연결되어 냉매를 순환시키는 냉매유출관을 포함하는 히트펌프 사이클의 냉매순환구조에 있어서, A refrigerant pipe corrugated so as to exchange heat as the refrigerant flows therein, a heat dissipation fin provided on an outer circumference of the refrigerant pipe to increase a heat transfer area, a refrigerant inlet pipe connected to an inlet of the refrigerant pipe to circulate the refrigerant, and an outlet of the refrigerant pipe In the refrigerant circulation structure of the heat pump cycle comprising a refrigerant outlet pipe connected to the circulation of the refrigerant, 제상모드시 상기 냉매유입관의 경우 압축기에서 토출된 고온고압의 냉매가 지나게 되는데, 이 고온고압의 냉매를 활용하기 위해 상기 냉매유입관의 일부를 성에가 많이 발생하는 실외열교환기 하단부를 지나도록 설계하여 상기 실외열교환기 하단부의 온도를 상승시키는 것을 특징으로 하는 히트펌프 사이클 실외기의 냉매순환구조.In the defrost mode, the refrigerant inlet tube passes through the high temperature and high pressure refrigerant discharged from the compressor. In order to utilize the high temperature and high pressure refrigerant, a part of the refrigerant inlet tube is designed to pass through the lower end of the outdoor heat exchanger where a lot of frost is generated. Refrigerant circulation structure of the heat pump cycle outdoor unit characterized in that to increase the temperature of the lower end of the outdoor heat exchanger.
KR1020040088482A 2004-11-02 2004-11-02 Structure for circulating refrigerants in outdoor unit of heat pump cycle KR20060039338A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020040088482A KR20060039338A (en) 2004-11-02 2004-11-02 Structure for circulating refrigerants in outdoor unit of heat pump cycle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020040088482A KR20060039338A (en) 2004-11-02 2004-11-02 Structure for circulating refrigerants in outdoor unit of heat pump cycle

Publications (1)

Publication Number Publication Date
KR20060039338A true KR20060039338A (en) 2006-05-08

Family

ID=37146632

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020040088482A KR20060039338A (en) 2004-11-02 2004-11-02 Structure for circulating refrigerants in outdoor unit of heat pump cycle

Country Status (1)

Country Link
KR (1) KR20060039338A (en)

Similar Documents

Publication Publication Date Title
US7984621B2 (en) Air conditioning system for communication equipment and controlling method thereof
KR101639814B1 (en) Refrigerating and freezing combine air conditioning system
EP2947402B1 (en) Heat pump
CN106061777A (en) Heat pump system for vehicle
CN102753914B (en) Air conditioner and air-conditioning hot-water-supplying system
JP4428341B2 (en) Refrigeration cycle equipment
CN105008823A (en) Heat pump water heater
KR20100059176A (en) Storage system
KR101964946B1 (en) temperature compensated cooling system high efficiency
KR101653567B1 (en) A Duality Cold Cycle Heatpump System Recovering Heat
KR20100046365A (en) Heat pump system
KR101122725B1 (en) Heat pump type cooling and heating apparatus
KR20100005736U (en) Heat pump system
KR101173736B1 (en) Refrigerating and freezing combine air conditioning system
KR20100005735U (en) storage system
KR100675900B1 (en) Refrigeration and air conditioning system
KR20060039338A (en) Structure for circulating refrigerants in outdoor unit of heat pump cycle
KR20090125312A (en) Heating and cooling system
KR100613502B1 (en) Heat pump type air conditioner
KR100554566B1 (en) Heat pump cycle for excessive low temperature
KR200371335Y1 (en) Air conditioner having Dryer for Defrost
KR20060025899A (en) Air conditioner having dryer for defrost
CN214891942U (en) Air conditioning system with chassis hot air heating function
KR102261131B1 (en) Heat pump air-conditioner having defrosting
KR100559784B1 (en) High efficiency air conditioning with constant temperature

Legal Events

Date Code Title Description
N231 Notification of change of applicant
A201 Request for examination
E601 Decision to refuse application