KR19980023074U - Defrosting system for refrigerators using the idea - Google Patents

Defrosting system for refrigerators using the idea Download PDF

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Publication number
KR19980023074U
KR19980023074U KR2019960036449U KR19960036449U KR19980023074U KR 19980023074 U KR19980023074 U KR 19980023074U KR 2019960036449 U KR2019960036449 U KR 2019960036449U KR 19960036449 U KR19960036449 U KR 19960036449U KR 19980023074 U KR19980023074 U KR 19980023074U
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South Korea
Prior art keywords
sensor
refrigerant
frost
heater
potential difference
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KR2019960036449U
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Korean (ko)
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KR200146723Y1 (en
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임효재
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배순훈
대우전자 주식회사
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Priority to KR2019960036449U priority Critical patent/KR200146723Y1/en
Publication of KR19980023074U publication Critical patent/KR19980023074U/en
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Publication of KR200146723Y1 publication Critical patent/KR200146723Y1/en

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    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/02—Detecting the presence of frost or condensate
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/002—Defroster control
    • F25D21/004—Control mechanisms
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/06—Removing frost
    • F25D21/08—Removing frost by electric heating
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
    • F25D2400/02—Refrigerators including a heater
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2700/00—Means for sensing or measuring; Sensors therefor

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Defrosting Systems (AREA)

Abstract

본 고안은 증발기의 냉매유로 표면에 형성되는 서리의 양을 센서를 통해 검출하고 그 검출결과를 근거로 자동으로 제상동작을 실행하도록 된 착상센서를 이용한 냉장고용 제상시스템에 관한 것으로, 기화점이 낮은 액체상태의 냉매가 순환되면서 주변으로부터 기화열을 빼앗아 고내의 온도를 낮추도록 된 냉매유로와, 이 냉매유로의 표면에 착상된 서리의 양에 따라 두 센서전극 사이의 전위차가 제1 또는 제2 레벨로 변화됨으로써 착상상태를 검출하도록 된 착상센서, 상기 냉매유로의 표면에 결빙된 서리를 융해시키기 위한 제상히터, 소정 제어신호에 따라 상기 제상히터를 구동제어하는 히터구동부, 및 상기 착상센서에 구비된 두 센서전극의 전압을 입력단자를 통해 인가받아 이 두 입력단자간의 전위차를 근거로 단락여부를 판단하여 그에 따라 상기 히터구동부를 통해 제상동작의 실행을 제어하는 제어부를 포함하여 구성된 것을 특징으로 한다.The present invention relates to a defrosting system for a refrigerator using an frosting sensor that detects an amount of frost formed on a surface of a refrigerant flow path of an evaporator through a sensor and automatically executes a defrosting operation based on the detection result. The potential difference between the two sensor electrodes changes to the first or second level depending on the amount of frost formed on the surface of the refrigerant passage, which cools the vaporization heat from the surroundings and lowers the temperature inside the refrigerant while the refrigerant in the state is circulated. 2 is provided in the frost sensor, a defrost heater for melting frost frozen on the surface of the refrigerant passage, a heater driver for driving and controlling the defrost heater according to a predetermined control signal. The voltage of the electrode is applied through the input terminal to determine whether there is a short circuit based on the potential difference between the two input terminals. And a control unit for controlling execution of the defrost operation through an exchanger is characterized in that the heater driving unit configured.

Description

착상센서를 이용한 냉장고용 제상시스템Defrosting system for refrigerators using the idea

본 고안은 냉장고의 제상시스템에 관한 것으로, 특히 증발기의 냉매유로 표면에 형성되는 서리의 양을 센서를 통해 검출하고 그 검출결과를 근거로 자동으로 제상동작을 실행하도록 된 착상센서를 이용한 냉장고용 제상시스템에 관한 것이다.The present invention relates to a defrosting system of a refrigerator. In particular, a defroster for a refrigerator using an frosting sensor configured to detect an amount of frost formed on a surface of a refrigerant flow path of an evaporator through a sensor and automatically perform a defrosting operation based on the detection result. It's about the system.

기화점이 낮은 액체상태의 냉매가 좁은 유로를 통해 순환되면서 기화작용에 의해 고내의 온도를 낮추도록 동작되게 되는 증발기는 도1에 도시된 바와같이, 냉매가 순환되는 유로의 표면에 단면적을 크게 하기 위해 형성된 핀(fin)이 무수히 돌출된 형상으로 되어 있는 바, 상술된 냉각작용이 일정시간 이상 지속되게 되면 고내에 유입된 비교적 따뜻한 공기가 증발기의 냉기에 의해 급랭되면서 상기 냉매유로의 표면에 서리가 형성되게 되며, 그 결과 냉각효율이 저하되는 원인이 되게 된다.The evaporator, which is operated to lower the temperature in the refrigerator by vaporization while the liquid refrigerant having a low evaporation point is circulated through the narrow flow path, has a large cross-sectional area on the surface of the flow path through which the refrigerant is circulated, as shown in FIG. The fins formed are innumerably protruding, and when the above-mentioned cooling action is continued for a predetermined time, frost is formed on the surface of the refrigerant flow path while the relatively warm air introduced into the furnace is quenched by the cold air of the evaporator. As a result, the cooling efficiency is a cause of deterioration.

따라서, 종래의 냉장고에서는 상술된 문제점을 해결하기 위하여 증발기의 하부에 서리를 제거하기 위한 제상히터를 설치하고, 이 제상히터에 의해 발생되는 열을 이용하여 냉매유로의 표면에 결빙된 서리를 제거하도록 하였다.Therefore, in the conventional refrigerator, in order to solve the above-mentioned problem, a defrost heater is installed at the bottom of the evaporator to remove frost, and the frost formed on the surface of the refrigerant flow path is removed by using the heat generated by the defrost heater. It was.

그러나, 종래의 냉장고에서는 냉매유로의 표면에 형성된 서리의 양을 정확히 판단할 수 있는 근거가 없었으므로 단순히 압축기가 소정 시간동안 동작될 때마다 그에 맞춰 제상히터를 주기적으로 가동하였으며, 그 결과 제상동작이 적시에 실행되지 못하는 한편 사용자가 장기간 여행을 떠나는 등의 이유로 착상된 서리의 양은 거의 없으나 불필요하게 정해진 시간마다 제상동작이 실행되게 됨으로써 전력이 낭비되게 되는 문제가 있었다.However, in the conventional refrigerator, since there is no basis for accurately determining the amount of frost formed on the surface of the refrigerant flow path, the defrost heater is periodically operated according to simply operating the compressor for a predetermined time. While it is not executed in a timely manner, there is almost no amount of frost that is conceived due to a user traveling for a long time, but there is a problem that power is wasted because defrosting is performed at an unnecessarily determined time.

본 고안은 상기한 사정을 감안하여 안출된 것으로서, 증발기의 냉매유로 표면에 형성되는 서리의 양을 센서를 통해 검출하고 그 검출결과를 근거로 자동으로 제상동작을 실행하도록 된 착상센서를 이용한 냉장고용 제상시스템을 제공함에 그 목적이 있다.The present invention was devised in view of the above circumstances, and for refrigerators using an idea sensor, which detects the amount of frost formed on the surface of the refrigerant flow path of the evaporator through a sensor and automatically executes a defrosting operation based on the detection result. The purpose is to provide a defrosting system.

도1은 일반적인 냉장고에 구비되는 증발기의 외형을 나타낸 외관사시도.1 is an external perspective view showing the appearance of an evaporator provided in a typical refrigerator.

도2는 본 고안에 따른 착상센서의 설치예를 나타낸 단면도.Figure 2 is a cross-sectional view showing an installation example of the idea sensor according to the present invention.

도3은 본 고안에 따른 제상시스템의 구성을 나타낸 블록구성도.Figure 3 is a block diagram showing the configuration of the defrosting system according to the present invention.

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

1 : 제어부 2 : 제상히터1: control unit 2: defrost heater

3 : 히터구동부 D : 핀(fin)3: heater driving unit D: fin

B : 절연피복 C : 캐패시터B: Insulation coating C: Capacitor

A : 냉매유로 R : 저항A: refrigerant flow path R: resistance

P1,P2 : 센서전극P1, P2: sensor electrode

상기 목적을 실현하기 위한 본 고안에 따른 착상센서를 이용한 냉장고용 제상시스템은 기화점이 낮은 액체상태의 냉매가 순환되면서 주변으로부터 기화열을 빼앗아 고내의 온도를 낮추도록 된 냉매유로와, 이 냉매유로의 표면에 착상된 서리의 양에 따라 두 센서전극 사이의 전위차가 제1 또는 제2 레벨로 변화됨으로써 착상상태를 검출하도록 된 착상센서, 상기 냉매유로의 표면에 결빙된 서리를 융해시키기 위한 제상히터, 소정 제어신호에 따라 상기 제상히터를 구동제어하는 히터구동부, 및 상기 착상센서에 구비된 두 센서전극의 전압을 입력단자를 통해 인가받아 이 두 입력단자간의 전위차를 근거로 단락여부를 판단하여 그에 따라 상기 히터구동부를 통해 제상동작의 실행을 제어하는 제어부를 포함하여 구성된 것을 특징으로 한다.The defrosting system for a refrigerator using an idea sensor according to the present invention for realizing the above object is a refrigerant flow passage which takes the heat of vaporization from the surroundings as the refrigerant in the liquid state having a low evaporation point is circulated to lower the temperature in the refrigerator, and the surface of the refrigerant passage. A frost sensor for detecting an frost state by changing the potential difference between two sensor electrodes according to the amount of frost formed on the first or second level, and a defrost heater for melting frost frozen on the surface of the refrigerant passage The heater driver for controlling the drive of the defrost heater in accordance with a control signal, and the voltage of the two sensor electrodes provided in the frost sensor is applied through an input terminal to determine whether or not a short circuit based on the potential difference between the two input terminals. It characterized in that it comprises a control unit for controlling the execution of the defrost operation through the heater drive unit.

즉, 상기한 구성으로 된 본 고안에 의하면 서리가 결빙되는 부위에 착상센서를 설치하고, 이 착상센서에 구비된 두 전극(P1,P2) 사이의 전위차를 근거로 착상상태를 정확히 검지하여, 그 검지결과에 따라 제상동작을 적시에 실행할 수 있게 된다.That is, according to the present invention having the above-described configuration, an implantation sensor is installed at a portion where frost is frozen, and the implantation state is accurately detected based on the potential difference between the two electrodes P1 and P2 provided in the implantation sensor. According to the detection result, the defrosting operation can be performed in a timely manner.

이하, 첨부된 도면을 참조하여 본 고안에 따른 실시예를 설명한다.Hereinafter, with reference to the accompanying drawings will be described an embodiment according to the present invention.

먼저, 도2는 본 고안에 따른 착상센서의 구성을 예시한 도면으로, 도1에 도시된 증발기의 '가'부분에 설치된 상태를 예시한 것이다.First, Figure 2 is a view illustrating a configuration of the idea sensor according to the present invention, illustrating the state installed in the 'ga' portion of the evaporator shown in FIG.

도2에서 참조부호 A는 예컨대 프레온 가스와 같이 기화점이 낮은 액체상태의 냉매가 순환되면서 주변으로부터 기화열을 빼앗아 고내의 온도를 낮추도록 된 냉매유로이고, D는 표면적을 크게하여 냉각효율을 높이기 위하여 냉매유로(A)의 표면에 일정간격으로 설치한 핀(fin)이다.In FIG. 2, reference numeral A denotes a refrigerant flow path that, for example, freon gas, has a low-vaporization liquid refrigerant and circulates the vaporization heat from the surroundings and lowers the temperature in the air, and D is a refrigerant to increase the cooling efficiency by increasing the surface area. It is a fin provided in the surface of the flow path A at regular intervals.

또한, 참조부호 P1,P2는 착상된 서리의 양을 검출하여 제상동작을 실행해야 할 시점에 소정 검출신호를 출력하는 착상센서의 두 전극으로서, 이 센서전극(P1,P2)은 도3에 도시된 바와 같이 상기 P1전극은 DC 5[V]의 바이어스 전원(B+)에 그리고 P2전극은 접지(GND)에 각각 접속된 상태로 구성되어 있다. 한편, 참조부호 B는 센서전극(P1,P2)을 상기 핀(D)과 냉매유로(A)로부터 전기적으로 절연시키기 위한 절연피복이다.In addition, reference numerals P1 and P2 are two electrodes of an idea sensor which detects the amount of frost formed and outputs a predetermined detection signal at the time when defrosting is to be executed. These sensor electrodes P1 and P2 are shown in FIG. As described above, the P1 electrode is connected to the bias power supply B + of DC 5 [V] and the P2 electrode is connected to the ground GND, respectively. On the other hand, reference numeral B denotes an insulating coating for electrically insulating the sensor electrodes P1, P2 from the fins D and the coolant flow path A.

이어, 상기한 구성으로 된 착상센서를 이용한 본 고안에 따른 제상시스템을 설명한다.Next, the defrosting system according to the present invention using the idea of the above-described configuration.

도3은 본 고안에 따른 제상시스템의 구성을 개략적으로 나타낸 블록구성도로서, 도2에 도시된 구성과 동일한 기능을 수행하는 구성요소에 대해서는 동일한 참조부호를 붙이고, 그 상세한 설명은 생략하기로 한다.Figure 3 is a block diagram schematically showing the configuration of the defrosting system according to the present invention, the same reference numerals for the components performing the same function as the configuration shown in Figure 2, the detailed description thereof will be omitted. .

도3에서 참조번호 1은 상기 두 센서전극(P1,P2)의 전압을 입력단자(I1,I2)를 통해 인가받아 이 두 입력단자(I1,I2)간의 전위차를 근거로 단락여부를 판단하여 그에 따라 제상동작의 실행을 제어하는 제어부이고, 2는 증발기의 하부에 설치되어 냉매유로의 표면에 결빙된 서리를 융해시키는 제상히터, 3은 상기 제어부(1)로부터의 소정 제어신호에 따라 상기 제상히터(2)를 구동제어하는 히터구동부이며, 참조부호 R 및 C는 상기 제어부(1)의 입력단자(I1,I2)에 인가되는 바이어스 전위(B+)를 안정적으로 공급하기 위한 저항 및 바이패스 캐패시터이다.Reference numeral 1 is whether or not short-circuit based on the potential difference between the two inputs (I 1, I 2) accepts applied through voltage input terminal (I 1, I 2) of the two sensor electrodes (P1, P2) in FIG. 3 Is a control unit for controlling the execution of the defrosting operation accordingly, 2 is a defrost heater installed at the lower part of the evaporator to melt frost frozen on the surface of the refrigerant flow path, and 3 is a predetermined control signal from the control unit 1. Accordingly, a heater driver for driving control of the defrost heater 2, and reference numerals R and C are for stably supplying a bias potential B + applied to the input terminals I 1 and I 2 of the controller 1. Resistor and bypass capacitors.

상기한 구성으로 된 본 고안에 따른 제상시스템의 동작은 다음과 같다.Operation of the defrosting system according to the present invention having the above configuration is as follows.

센서전극(P1)은 DC 5[V]의 바이어스 전원(B+)에 그리고 P2전극은 접지(GND)에 각각 접속된 상태로 구성되어 있는 바, 착상된 서리의 양이 많지 않은 상태에서는 제어부(1)의 두 입력단자(I1,I2) 사이의 전위차가 DC 5[V]를 유지하게 되므로 제어부(1)는 제상동작을 실행하지 않게 된다.The sensor electrode P1 is connected to the bias power supply B + of DC 5 [V] and the P2 electrode is connected to the ground GND. In the state where the amount of frost formed is not large, the control unit ( Since the potential difference between the two input terminals I 1 and I 2 of 1) maintains DC 5 [V], the controller 1 does not perform the defrosting operation.

한편, 냉장고가 가동된 이후 일정시간이 경과되게 되면 상기 냉매유로의 표면에 착상된 서리에 의해 상기 두 센서전극(P1,P2) 사이가 전기적으로 단락(short) 상태로 되게 되며, 그 결과 제어부(1)의 두 입력단자(I1,I2) 사이의 전위차는 0[V]가 되게 된다.On the other hand, when a certain time has elapsed since the refrigerator was started, the two sensor electrodes P1 and P2 were electrically shorted by frost formed on the surface of the refrigerant passage, and as a result, the controller ( The potential difference between the two input terminals I 1 and I 2 in 1 ) becomes 0 [V].

이때, 제어부(1)는 상기 히터구동부(3)를 통해 제상히터(2)가 구동되도록 제어함으로써 제상동작을 실행하게 된다.At this time, the control unit 1 performs the defrosting operation by controlling the defrost heater 2 to be driven by the heater driving unit 3.

한편, 제상동작이 소정 시간동안 실행되어 다시 상기 두 센서전극(P1,P2) 사이의 전위차가 DC 5[V]로 회복되게 되면, 제어부(1)는 상기 히터구동부(3)를 통해 제상히터(2)의 가동을 중지시킴으로써 제상동작을 중지하게 된다.On the other hand, when the defrosting operation is performed for a predetermined time and the potential difference between the two sensor electrodes P1 and P2 is restored to DC 5 [V], the controller 1 controls the defrost heater through the heater driver 3. The defrosting operation is stopped by stopping the operation of 2).

즉, 상기 실시예에 의하면 서리가 결빙되는 부위에 착상센서를 설치하고, 이 착상센서에 구비된 두 전극(P1,P2) 사이의 전위차를 근거로 착상상태를 정확히 검지하여, 그 검지결과에 따라 제상동작을 적시에 실행할 수 있게 된다.That is, according to the embodiment, an implantation sensor is installed at a part where frost is frozen, and the implantation state is accurately detected based on the potential difference between the two electrodes P1 and P2 provided in the implantation sensor, and according to the detection result. The defrosting operation can be executed in a timely manner.

이상 설명한 바와 같이, 본 고안에 의하면 증발기의 냉매유로 표면에 형성되는 서리의 양을 센서를 통해 검출하고 그 검출결과를 근거로 자동으로 제상동작을 실행하도록 함으로써 필요한 시점에 정확히 제상동작이 실행되도록 된 착상센서를 이용한 냉장고용 제상시스템을 실현할 수 있게 된다.As described above, according to the present invention, the amount of frost formed on the surface of the refrigerant flow path of the evaporator is detected through a sensor, and the defrosting operation is executed exactly when necessary by automatically performing the defrosting operation based on the detection result. It is possible to realize a defrosting system for a refrigerator using an idea sensor.

Claims (2)

기화점이 낮은 액체상태의 냉매가 순환되면서 주변으로부터 기화열을 빼앗아 고내의 온도를 낮추도록 된 냉매유로와,A refrigerant flow path that lowers the temperature in the furnace by taking the heat of vaporization from the surroundings as the refrigerant in the liquid state having a low evaporation point circulates, 이 냉매유로의 표면에 착상된 서리의 양에 따라 두 센서전극 사이의 전위차가 제1 또는 제2 레벨로 변화됨으로써 착상상태를 검출하도록 된 착상센서,An implantation sensor configured to detect an implantation state by changing the potential difference between the two sensor electrodes to a first or second level according to the amount of frost formed on the surface of the refrigerant passage, 상기 냉매유로의 표면에 결빙된 서리를 융해시키기 위한 제상히터,Defrost heater for melting frost frozen on the surface of the refrigerant passage, 소정 제어신호에 따라 상기 제상히터를 구동제어하는 히터구동부, 및A heater driver for driving control of the defrost heater according to a predetermined control signal; 상기 착상센서에 구비된 두 센서전극의 전압을 입력단자를 통해 인가받아 이 두 입력단자간의 전위차를 근거로 단락여부를 판단하여 그에 따라 상기 히터구동부를 통해 제상동작의 실행을 제어하는 제어부를 포함하여 구성된 것을 특징으로 하는 착상센서를 이용한 냉장고용 제상시스템.And a controller configured to receive the voltages of the two sensor electrodes provided in the sensor and determine whether there is a short circuit based on the potential difference between the two input terminals, and thereby control the execution of the defrosting operation through the heater driver. Refrigerator defrosting system using an frosting sensor, characterized in that configured. 제 1 항에 있어서, 상기 착상센서에 구비된 센서전극은 절연피복에 의해 상기 냉매유로와 전기적으로 절연되도록 구성된 것을 특징으로 하는 착상센서를 이용한 냉장고용 제상시스템.The defrosting system of claim 1, wherein the sensor electrode provided in the frost sensor is electrically insulated from the refrigerant passage by an insulation coating.
KR2019960036449U 1996-10-30 1996-10-30 Defrosting sensor possess refrigerator of defrosting system KR200146723Y1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011139011A1 (en) * 2010-05-04 2011-11-10 주식회사 제일화인테크 Defrosting device for the natural-convection evaporator of a low-temperature store
KR20180031166A (en) * 2016-09-19 2018-03-28 엘지전자 주식회사 Air Conditioner and Controlling Method for the Same

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100578363B1 (en) * 1999-11-10 2006-05-11 주식회사 엘지이아이 Circuit for defrost control in refrigerator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011139011A1 (en) * 2010-05-04 2011-11-10 주식회사 제일화인테크 Defrosting device for the natural-convection evaporator of a low-temperature store
KR20180031166A (en) * 2016-09-19 2018-03-28 엘지전자 주식회사 Air Conditioner and Controlling Method for the Same

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