KR20010047650A - Method for defrosting operation of air-conditioner used both cooler and heater - Google Patents
Method for defrosting operation of air-conditioner used both cooler and heater Download PDFInfo
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- KR20010047650A KR20010047650A KR1019990051962A KR19990051962A KR20010047650A KR 20010047650 A KR20010047650 A KR 20010047650A KR 1019990051962 A KR1019990051962 A KR 1019990051962A KR 19990051962 A KR19990051962 A KR 19990051962A KR 20010047650 A KR20010047650 A KR 20010047650A
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- defrosting operation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
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- Air Conditioning Control Device (AREA)
Abstract
Description
본 발명은 냉난방 겸용 에어컨의 제상운전 제어방법에 관한 것으로서, 보다 상세하게는 난방운전시 실외열교환기에 착상되는 성에를 제거하기 위해 실내기의 현재 소비전류값을 측정하여 표준소비전류보다 일정값 이상 작아질 때 제상운전을 수행할 수 있도록 한 냉난방 겸용 에어컨의 제상운전 제어방법에 관한 것이다.The present invention relates to a defrosting operation control method of a combined air-conditioning and air conditioner, and more particularly, to measure the current consumption current of the indoor unit to remove the frost formed on the outdoor heat exchanger during heating operation to be smaller than a certain value than the standard current consumption. It relates to a defrosting operation control method of a combined air-conditioning and air conditioning to perform a defrosting operation.
일반적인 에어컨은 액체가 증발할 때 주위의 열을 흡수하는 현상을 이용하여 냉방작용을 하는 것으로서 이러한 냉방작용 이외에도, 제습작용을 함께 수행한다. 그런데, 냉난방 겸용 에어컨의 경우 냉방과 난방의 경우 냉매의 순환경로를 반대로 하여 난방운전시에는 실외의 열을 흡수하여 실내로 방출하게 되고, 냉방운전시에는 실내의 열을 흡수하여 실외로 방출하게 된다.In general, the air conditioner uses the phenomenon of absorbing the surrounding heat when the liquid evaporates, and performs cooling as well as dehumidification. By the way, in the case of air-conditioning combined air-conditioning and cooling and heating, the circulation path of the refrigerant is reversed so that the heat is absorbed and released into the room during the heating operation, and the heat is absorbed and released into the outdoor during the cooling operation. .
이와 같이 냉난방 겸용 에어컨의 난방운전시 실외열교환기에서 주위의 열을 흡수하는 증발과정시 실외열교환기 코일에 성에가 착상되기 때문에 이를 제거하기 위한 제상운전을 수행하게 된다.As the frost is formed on the outdoor heat exchanger coil during the evaporation process of absorbing the surrounding heat in the outdoor heat exchanger during the heating operation of the combined air-conditioning and air conditioning, the defrosting operation is performed to remove the frost.
도1은 일반적인 냉난방 겸용 에어컨의 냉매순환도이다.1 is a refrigerant circulation diagram of a general air-conditioning combined air conditioner.
여기에 도시된 바와 같이 실외기(20)는 냉매를 압축시키는 압축기(210)와, 압축기(210)의 출력단에 냉매의 순환 경로를 변경하기 위한 사방변(240)이 설치된다. 그리고, 일측이 사방변(240)과 연결되어 실외에서 열교환이 이루어지는 실외열교환기(40)와, 일측이 사방변(240)과 연결되어 실내에서 열교환이 이루어지는 실내열교환기(30)와, 실내열교환기(30)의 타측과 실외열교환기(40)의 타측간에 매개된 감압장치(50)로 이루어진다.As shown here, the outdoor unit 20 includes a compressor 210 for compressing a refrigerant, and four sides 240 for changing a circulation path of the refrigerant at an output end of the compressor 210. In addition, an outdoor heat exchanger 40 having one side connected to the four sides 240 to heat exchange outdoors, and an indoor heat exchanger 30 having one side connected to the four sides 240 performing heat exchange indoors, and indoor heat exchange The pressure reducing device 50 is provided between the other side of the device 30 and the other side of the outdoor heat exchanger 40.
그리고, 실내열교환기(30)에는 실내온도를 측정하는 실내온도센서(110)와, 실내열교환기(30)의 코일온도를 측정하는 실내열교환기 코일온도센서(120)가 설치되고, 실외열교환기(40)에는 실외온도를 측정하는 실외온도센서(260)와, 실외열교환기(40)의 코일온도를 측정하는 실외열교환기 코일온도센서(270)가 설치된다.In addition, the indoor heat exchanger (30) is provided with an indoor temperature sensor (110) for measuring the indoor temperature, and an indoor heat exchanger coil temperature sensor (120) for measuring the coil temperature of the indoor heat exchanger (30). 40, an outdoor temperature sensor 260 for measuring an outdoor temperature and an outdoor heat exchanger coil temperature sensor 270 for measuring a coil temperature of the outdoor heat exchanger 40 are installed.
위와 같은 냉난방 겸용 에어컨의 냉매순환경로를 살펴보면 다음과 같다.Looking at the coolant net environmental path of the air-conditioning combined air conditioning as described above are as follows.
먼저, 냉방운전시에는 즉, 실선 화살표로 나타낸 바와 같이 압축기에서 압축된 냉매는 사방변(240)에서 실외열교환기(40)로 흐르도록 경로를 설정함에 따라 실외열교환기(40)로 흘러 함유된 열을 방출한 후 감압장치(50)로 보내지고, 다시 실내열교환기(30)로 보내져 액체상태에서 기체상태로 증발되면서 주위의 열을 흡수하는 열교환이 이루어진 후 사방변(240)을 통해 다시 압축기(210)로 보내져 순환하게 된다.First, during the cooling operation, that is, the refrigerant compressed by the compressor as shown by the solid arrow is flowed into the outdoor heat exchanger 40 as the path is set to flow from the four sides 240 to the outdoor heat exchanger 40. After dissipating the heat is sent to the decompression device 50, and again to the indoor heat exchanger (30) is evaporated in a gaseous state in the liquid state is made of heat exchange to absorb the surrounding heat is made through the compressor again through the four sides (240) Sent to 210 to cycle.
이때, 실내에 설치된 실내열교환기(30)에서 주위의 열을 흡수하기 때문에 실내를 냉방하게 된다.At this time, since the indoor heat exchanger 30 installed in the room absorbs the surrounding heat, the room is cooled.
다음으로, 난방운전시에는 점선 화살표로 나타낸 바와 같이 압축기(210)에서 압축된 냉매는 사방변(240)에서 실내열교환기(30)로 흐르도록 경로를 설정함에 따하 실내열교환기(30)로 흘러 함유된 열을 방출한 후 감압장치(50)로 보내지고, 다시 실외열교환기(40)로 보내져 액체상태에서 기체상태로 증발되면서 주위의 열을 흡수하는 열교환이 이루어진 후 사방변(240)을 통해 다시 압축기(210)로 보내져 순환하게 된다.Next, during the heating operation, the refrigerant compressed by the compressor 210 flows to the indoor heat exchanger 30 as the refrigerant flows from the four sides 240 to the indoor heat exchanger 30 as shown by the dotted arrow. After dissipating the contained heat is sent to the decompression device 50, and again to the outdoor heat exchanger (40) is evaporated in a gaseous state in the liquid state is a heat exchange to absorb the surrounding heat is made through the four sides (240) It is sent back to the compressor 210 to circulate.
이때, 실내에 설치된 실내열교환기(30)에서 냉매에 함유된 열을 방출하기 때문에 실내를 난방하게 된다.At this time, since the heat contained in the refrigerant is released from the indoor heat exchanger 30 installed in the room, the room is heated.
위와 같이 이루어진 냉난방 겸용 에어컨의 난방운전시 실외열교환기(40)에서 주위의 열을 흡수하는 증발과정시 실외열교환기(40) 코일에 성에가 착상되기 때문에 이를 제거하기 위한 제상운전을 수행하게 된다.In the heating operation of the combined air-conditioning and air conditioning made as described above, the defrosting operation is performed to remove the frost on the coil of the outdoor heat exchanger 40 during the evaporation process of absorbing the surrounding heat from the outdoor heat exchanger 40.
일반적인 제상운전의 판단은 실외열교환기(40)의 코일 온도를 측정하여 성에가 착상되는 온도를 기준으로 이 보다 낮을 경우 제상운전을 진입하기 위해 압축기(210)를 오프시키고 사방변(240)을 오프시켜 냉매의 순환방향을 반대로 절환시켜 냉방운전시 냉매 순환 경로를 취하도록 한다. 그런다음 압축기(210)를 작동시켜 제상운전을 진행시킨다. 이 제상운전은 냉방운전과 동일한 작동으로 실외열교환기(40)에서 열을 방출하도록 하여 코일에 착상된 성에를 녹이게 된다.In general, the defrosting operation is determined by measuring the coil temperature of the outdoor heat exchanger 40, and when the frost is lower than this, the compressor 210 is turned off and the four sides 240 is turned off to enter the defrosting operation. By switching the circulation direction of the refrigerant in reverse to take the refrigerant circulation path during the cooling operation. Then, the compressor 210 is operated to proceed with defrosting. This defrosting operation dissipates the frost formed on the coil by dissipating heat from the outdoor heat exchanger 40 in the same operation as the cooling operation.
위와 같은 방법에 의한 제상운전은 실외기에 설치된 실외열교환기의 코일 온도를 측정하여 성에가 착상되는 온도를 측정하여 제상운전을 수행했기 때문에 실내기에서는 제상운전을 판단하는 방법이 없었다.In the defrosting operation according to the above method, the defrosting operation was performed in the indoor unit because the defrosting operation was performed by measuring the coil temperature of the outdoor heat exchanger installed in the outdoor unit and measuring the temperature at which frost is implanted.
본 발명의 목적은 냉난방 겸용 에어컨의 난방운전 수행 중 실외열교환기에 성에가 착상되어 실외기의 열교환량이 떨어지고 열부하가 낮아질 때 소비전류값이 떨어지는 현상을 이용하여 실내기에서 소비전류값의 변화를 감지함으로써 제상운전을 판단하고 제상운전을 수행하여 착상된 성에를 제거할 수 있도록 한 냉난방 겸용 에어컨의 제상운전 제어방법을 제공함에 있다.An object of the present invention is to defrost operation by detecting a change in the current consumption in the indoor unit by using the phenomenon that the frost is formed in the outdoor heat exchanger during the heating operation of the combined air-conditioning and air conditioner to reduce the heat exchange amount of the outdoor unit and the consumption current value when the heat load is lowered The present invention provides a control method of defrosting operation of a combined air-conditioning and air conditioning system to determine the frost and to perform the defrosting operation.
도1은 일반적인 냉난방 겸용 에어컨의 냉매순환도이다.1 is a refrigerant circulation diagram of a general air-conditioning combined air conditioner.
도 2는 본 발명에 의한 냉난방 겸용 에어컨이 제상운전 제어방법을 설명하기 위한 흐름도이다.Figure 2 is a flow chart for explaining a defrosting operation control method of a combined air conditioning and air conditioner according to the present invention.
- 도면의 주요부분에 대한 부호의 설명 --Explanation of symbols for the main parts of the drawings-
30 : 실내열교환기 40 : 실외열교환기30: indoor heat exchanger 40: outdoor heat exchanger
120 : 실내열교환기 코일온도센서120: indoor heat exchanger coil temperature sensor
140 : 실내팬 210 : 압축기140: indoor fan 210: compressor
240 : 사방변 270 : 실외열교환기 코일온도센서240: four sides 270: outdoor heat exchanger coil temperature sensor
290 : 실외팬290: Outdoor Fan
상기와 같은 목적을 실현하기 위한 본 발명은 난방운전시 실외열교환기 코일에 착상된 성에를 사방변의 작동을 제어하여 냉매의 순환경로를 변경함으로써 제상운전을 수행하도록 하는 냉난방 겸용 에어컨의 제상운전 제어방법에 있어서, 난방운전 중 일정시간 동안 현재 소비전류값이 난방표준 소비전류값 이하에서 계속해서 감소되는가 비교하는 단계와, 현재 소비전류값이 계속해서 감소될 때 실내외기 운전을 일정시간 정지시킨 후 제상운전을 수행하는 단계와, 제상운전 수행을 현재 소비전류값이 일정시간 동안 내에 냉방표준 소비전류값 이상으로 올라갈 때 정지시키는 단계와, 제상운전이 정지된 일정시간 후 난방운전을 다시 수행하는 단계로 이루어진 것을 특징으로 한다.The present invention for realizing the above object is a defrosting operation control method of a combined air conditioning and air conditioning to perform the defrosting operation by changing the circulating path of the refrigerant by controlling the operation of the four sides frost formed on the outdoor heat exchanger coil during heating operation In the heating operation, the step of comparing the current consumption current value continuously decreases below the heating standard consumption current value for a certain period of time during the heating operation, and defrosting after stopping the indoor air operation for a certain time when the current consumption current value continues to decrease. Performing the defrosting operation, stopping the defrosting operation when the current consumption value rises above the cooling standard consumption current value within a predetermined time period, and performing the heating operation again after a predetermined time when the defrosting operation is stopped. Characterized in that made.
위와 같이 이루어진 본 발명은 냉난방 겸용 에어컨의 난방운전 중 실외열교환기에 성에가 착상되면 열교환량이 떨어지고 열부하가 낮아지게 되면서 소비전류값이 떨어지게 된다. 따라서, 소비전류값의 변화를 실내기에서 감지함으로써 제상운전을 판단하고 제상운전을 수행하여 착상된 성에를 제거할 수 있도록 한다.The present invention made as described above when the frost is formed in the outdoor heat exchanger during the heating operation of the air-conditioning combined air-conditioning is reduced the heat exchange amount and the heat load is lowered the current consumption value. Therefore, by detecting the change in the current consumption in the indoor unit to determine the defrosting operation and perform the defrosting operation to remove the frosted frost.
이하, 본 발명의 바람직한 실시예를 첨부된 도면을 참조하여 설명한다. 또한 본 실시예는 본 발명의 권리범위를 한정하는 것은 아니고, 단지 예시로 제시된 것이다.Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. In addition, this embodiment is not intended to limit the scope of the present invention, but is presented by way of example only.
도 2는 본 발명에 의한 냉난방 겸용 에어컨이 제상운전 제어방법을 설명하기 위한 흐름도이다.Figure 2 is a flow chart for explaining a defrosting operation control method of a combined air conditioning and air conditioner according to the present invention.
먼저, 난방운전이 수행되고 있는가 비교한다(S200). 제상운전은 난방운전일 때 실외열교환기(40)에 착상된 성에를 제거하기 위한 것으로써 난방운전이 아닐 경우에는 종료된다. 그리고, 난방운전일 경우에는 1분 간격으로 현재 소비전류값(A2)을 계속해서 측정한다(S202). 이렇게 측정된 현재 소비전류값(A2)과 난방표준 소비전류값(A1)의 약 80%되는 값과 비교하여 현재 소비전류값(A2)이 클 경우에는 다시 난방운전을 확인하는 단계(S200)로 리턴된다(S204).First, it is compared whether the heating operation is being performed (S200). The defrosting operation is to remove frost formed on the outdoor heat exchanger 40 during the heating operation and ends when the heating operation is not performed. In the case of heating operation, the current consumption value A 2 is continuously measured at one minute intervals (S202). When the current consumption current value (A 2 ) is large compared to the measured value of the current consumption current (A 2 ) and about 80% of the heating standard consumption current value (A 1 ), checking the heating operation again ( It returns to S200 (S204).
그러나, 현재 소비전류값(A2)이 난방표준 소비전류값(A1)의 80%값되는 값보다 작을 경우에는 제상타이머(TS)를 작동시킨다(S206). 즉, 실외열교환기(40)에 성에가 착상되어 열교환량이 떨어지고 있고 열부하가 낮아지게 되어 소비전류값(A2)이 난방표준 소비전류값(A1) 이하로 떨어지고 있음을 알 수 있다. 따라서, 실외열교환기(40)에 성에가 착상되고 있다고 판단하게 되어 제상타이머(TS)를 작동시키게 된다.However, when the current consumption current value A 2 is smaller than the value of 80% of the heating standard consumption current value A 1 , the defrost timer T S is operated (S206). That is, it can be seen that frost is formed on the outdoor heat exchanger 40 so that the heat exchange amount is decreased and the heat load is lowered so that the consumption current value A 2 falls below the heating standard consumption current value A 1 . Therefore, it is determined that frost is implanted in the outdoor heat exchanger 40, and the defrost timer T S is operated.
그리고, 계속해서 측정되는 현재 소비전류값(A2)이 계속해서 감소되고 있는가를 20분 동안 비교한다(S208). 이때 다시 측정된 소비전류값(A2)이 감소하지 않을 경우에는 착상이 진행되다가 어떠한 요인에 의해 착상이 정지되거나 일부 녹은 경우로 판단하여 제상타이머를 초기화(TS=0)시키고, 다시 현재 소비전류값(A2)과 난방표준 소비전류값(A1)과 비교하는 단계(S204)로 리턴된다(S210). 이렇게 다시 측정되는 소비전류값(A2)이 계속해서 20분간 감소하는가 비교하게 된다(S212). 즉, 20분 동안 계속해서 감소하지 하지 않을 경우에는 제상운전에 진입하지 않게 된다.Then, it is compared for 20 minutes whether the current consumption current value A 2 which is continuously measured is continuously reduced (S208). In this case, if the measured current consumption value (A 2 ) does not decrease again, the conception progresses, and the defrosting timer is initialized (T S = 0) by determining that the idea is stopped or partially melted by some factor, and then consumes the current again. It is returned to step S204 of comparing the current value A 2 with the heating standard consumption current value A 1 (S210). The consumption current value A 2 measured again in this way is compared to continuously decrease for 20 minutes (S212). That is, if it does not decrease continuously for 20 minutes, it will not enter the defrosting operation.
이때 소비전류값(A2)의 변화를 감지하는 시간은 에어컨의 용량에 따라 20분∼40분 정도의 범위내에서 설정한다.At this time, the time for detecting the change in the consumption current value (A 2 ) is set within the range of 20 to 40 minutes depending on the capacity of the air conditioner.
이렇게 20분 동안 현재 소비전류값(A2)이 난방표준 소비전류값(A1) 이하에서 계속해서 내려갔을 경우 제상운전에 진입하기 위해 실내외기 운전을 정지시킨다(S214). 즉, 실내팬, 실외팬, 압축기(210) 등의 작동을 정지시킨다.When the current consumption current (A 2 ) continues to fall below the heating standard consumption current value (A 1 ) for 20 minutes, the indoor outdoor operation is stopped to enter the defrosting operation (S214). That is, the operation of the indoor fan, outdoor fan, compressor 210 and the like is stopped.
그런 다음, 약 3분간 기다려 냉매압이 균일하게 유지될 수 있도록 한다(S216).Then, wait about three minutes to maintain the refrigerant pressure uniformly (S216).
그리고, 제상운전을 위해 사방변(240)을 오프시켜 냉매의 순환이 냉방운전과 같이 순환되도록 하고 압축기(210)만 작동시킨다(S218). 이때 실내팬이나 실외팬은 작동시키지 않는다.Then, the four sides 240 is turned off for the defrosting operation so that the circulation of the refrigerant is circulated like the cooling operation and only the compressor 210 is operated (S218). At this time, do not operate indoor fan or outdoor fan.
그리고, 제상운전의 작동시간을 측정하기 위해 제상운전 타이머(TO)를 작동시킨다(S220). 그런 다음, 8분간의 제상운전 시간동안 현재 소비전류값(A2)이 냉방표준 소비전류값(A3) 이상으로 올라갔는가 비교하게 된다(S222)(S224).Then, the defrosting operation timer (T O ) is operated to measure the operating time of the defrosting operation (S220). Then, it is compared whether the current consumption current value A 2 rises above the cooling standard consumption current value A 3 during the defrosting operation time of 8 minutes (S222) (S224).
이때 8분간 제상운전 시간은 일반적으로 3000Kcal/h 이하에서 적용되는 값이며 이 이상에서는 제상운전 시간을 12분 정도로 설정한다.At this time, the defrosting operation time for 8 minutes is a value generally applied at 3000 Kcal / h or less, and the defrosting operation time is set at about 12 minutes or more.
이와 같이 제상운전시간을 한정하는 것은 제상운전을 수행하여 착상된 성에가 녹으면서 실외열교환기(40)의 온도는 상승하지 않으면서 착상된 성에는 녹게된다. 이렇게 착상된 성에가 모두 녹게 되면 실외열교환기(40)의 온도가 상승되면서 압축기(210)에 많은 부하를 받게 되어 소비전류값(A2)은 냉방표준 소비전류값(A3) 이상으로 상승하게 된다.In this way, the defrosting operation time is limited by melting the frost formed by performing the defrosting operation while melting the frost formed without increasing the temperature of the outdoor heat exchanger 40. When all of the frost formed in this manner is melted, the temperature of the outdoor heat exchanger 40 is increased, and the compressor 210 receives a large load so that the consumption current value A 2 rises above the cooling standard consumption current value A 3 . do.
따라서, 제상운전을 8분 이상 수행하지 않도록 함과 동시에 8분 이내에 제상이 완료되어 압축기(210)에 무리가 가해지게 되는 것을 방지하기 위해 소비전류값(A2)이 냉방표준 소비전류값(A3)보다 커지게 되면 제상운전을 정지시켜 압축기(210)의 신뢰성을 악영향을 끼치지 않도록 한다.Therefore, in order not to perform the defrosting operation for more than 8 minutes and at the same time to prevent the defrosting is completed within 8 minutes to be applied to the compressor 210, the consumption current value (A 2 ) is the cooling standard consumption current value (A If greater than 3 ) to stop the defrosting operation so as not to adversely affect the reliability of the compressor (210).
이렇게 제상운전을 정지시키기 위해 압축기(210)를 오프시키고 사방변(240)을 온시켜 다시 난방운전을 수행할 수 있도록 한다(S226). 그런 다음 냉매압이 균일하게 이루어지도록 약 3분간 지연시킨 후(S228) 난방운전을 수행하게 된다(S230).In order to stop the defrosting operation, the compressor 210 is turned off and the four sides 240 are turned on so that the heating operation can be performed again (S226). Then, after delaying for about 3 minutes so that the refrigerant pressure is made uniform (S228), the heating operation is performed (S230).
상기한 바와 같이 본 발명은 냉난방 겸용 에어컨의 난방운전 수행 중 실외열교환기에 성에가 착상되어 실외기의 열교환량이 떨어지고 열부하가 낮아지질 때 소비전류값이 떨어지는 현상을 이용하여 실내기에서 소비전류값의 변화를 감지함으로써 실외열교환기의 코일온도 측정없이 제상운전을 판단하고 제상운전을 수행할 수 있는 효과가 있다.As described above, the present invention detects a change in current consumption in an indoor unit by using a phenomenon in which frost is formed in an outdoor heat exchanger during the heating operation of a combined air-conditioning and air conditioner and the heat exchange amount of the outdoor unit drops and the current consumption drops when the heat load decreases. Therefore, it is possible to determine the defrosting operation and perform the defrosting operation without measuring the coil temperature of the outdoor heat exchanger.
Claims (5)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019990051962A KR20010047650A (en) | 1999-11-22 | 1999-11-22 | Method for defrosting operation of air-conditioner used both cooler and heater |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1019990051962A KR20010047650A (en) | 1999-11-22 | 1999-11-22 | Method for defrosting operation of air-conditioner used both cooler and heater |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR102188081B1 (en) | 2020-09-02 | 2020-12-07 | 이유덕 | Cooling and heating system equipped with frost protection and defrost function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102188081B1 (en) | 2020-09-02 | 2020-12-07 | 이유덕 | Cooling and heating system equipped with frost protection and defrost function |
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