KR20020078877A - Element of air conditioner system - Google Patents

Element of air conditioner system Download PDF

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Publication number
KR20020078877A
KR20020078877A KR1020010019143A KR20010019143A KR20020078877A KR 20020078877 A KR20020078877 A KR 20020078877A KR 1020010019143 A KR1020010019143 A KR 1020010019143A KR 20010019143 A KR20010019143 A KR 20010019143A KR 20020078877 A KR20020078877 A KR 20020078877A
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KR
South Korea
Prior art keywords
heat exchange
total heat
exchange element
bark
support plate
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KR1020010019143A
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Korean (ko)
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KR100382968B1 (en
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최동식
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최동식
김효주
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Priority to KR10-2001-0019143A priority Critical patent/KR100382968B1/en
Publication of KR20020078877A publication Critical patent/KR20020078877A/en
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Publication of KR100382968B1 publication Critical patent/KR100382968B1/en

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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
    • F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
    • F24F12/001—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air
    • F24F12/006—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air using an air-to-air heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/30—Arrangement or mounting of heat-exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • F28F3/025—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being corrugated, plate-like elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/12—Elements constructed in the shape of a hollow panel, e.g. with channels

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Disinfection, Sterilisation Or Deodorisation Of Air (AREA)
  • Paper (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

PURPOSE: A total heat exchange element of air-conditioning and ventilation system is provided to be resistant against moisture and to have excellent dynamic stability. CONSTITUTION: A total heat exchange element(30) comprises a plurality of supporting plates(31) and total heat exchange plates(32) layered alternately. The supporting plates are made of mixture of 60% of bark of paper mulberry, 20% of abaca and 20% of general wood so that weight per square meter is 80g-90g. The total heat exchange plates are made of 90% of bark of paper mulberry and 10% of abaca so that weight per square meter is 50g-60g. 10%-20% of active carbon is mixed in the supporting plates and the total heat exchange plates.

Description

공조환기장치의 전열교환엘리먼트{ELEMENT OF AIR CONDITIONER SYSTEM}Electric heat exchange element of air conditioning and ventilation system {ELEMENT OF AIR CONDITIONER SYSTEM}

본 발명은 공조환기장치에 관한 것으로, 특히 공조환기장치의 주요부품인 전열교환엘리먼트를 구성하고 있는 전열교환판과 지지판의 재질을 창호지 펄프와 이에 활성탄을 배합하여 제조하게 됨으로써 전열교환 기능과 습도조절, 정화, 항균 능력을 고루 갖추게 되는 공조환기장치의 전열교환엘리먼트에 관한 것이다.The present invention relates to an air conditioning ventilator, and in particular, the heat exchanger plate and the support plate constituting the material of the heat exchanger plate and the support plate constituting the heat exchange element, which is a major component of the air conditioning ventilator by mixing the carbon and activated carbon to the heat exchange function and humidity control The present invention relates to a total heat exchange element of an air conditioning and ventilation device which is equipped with the ability of purifying, antibacterial and even.

일반적으로 공조환기장치에서 에너지 회수기능을 갖는 열교환엘리먼트는 현열교환 엘리먼트와 전열교환 엘리먼트로 분류되는 데, 현열교환 엘리먼트는 그 재질이 금속 및 합성수지로 이루어지고, 높은 온도와 습기가 많은 장소의 현열교환 환기장치에 적용되며, 전열교환 엘리먼트는 재질이 특수가공지로 되어 있고, 인간의 생활과 밀접한 관계가 있는 주택, 호텔, 사무실 등의 현열 및 잠열을 교환하는 전열교환 환기장치에 적용되는 것이다.In general, heat exchange elements having an energy recovery function are classified into sensible heat exchange elements and total heat exchange elements in an air conditioning ventilator. The sensible heat exchange elements are made of metal and synthetic resin, and sensible heat exchange in a place with high temperature and high humidity. It is applied to the ventilation device, the heat exchange element is applied to the heat transfer ventilation device for exchanging the sensible and latent heat of houses, hotels, offices, etc., which is made of specially processed paper and is closely related to human life.

이러한 현열교환 엘리먼트의 재질과 소재는 국내에서도 개발되고, 엘리먼트를 생산할 수 있으나, 전열교환 엘리먼트의 재질과 소재는 국내에서 개발되지 않아 완제품 엘리먼트나 공조환기장치를 수입하고 있는 실정으로 국산 공조환기장치의 품질과 성능을 저하시키고, 외화 낭비의 원인이 되고 있는 것이다.The material and material of the sensible heat exchange element can be developed in Korea, and the element can be produced. However, the material and material of the electrothermal heat exchange element are not developed in Korea, and the imported element or air conditioner is imported. It is degrading quality and performance and is a cause of waste of foreign currency.

본 발명은 이와 같은 종래의 문제점을 해결하기 위하여 안출된 것으로, 본 발명은 창호지 펄프와 활성탄이 배합된 창호지 펄프로써 제조되어 습도에 강하면서 질기고, 복원력이 뛰어나게 되었으며, 또한 탈취, 정화, 항균 능력을 고루 갖추게되어 품질의 성능을 향상시키게 되는 공조환기장치의 전열교환엘리먼트를 제공하는 데 그 목적이 있다.The present invention has been made in order to solve such a conventional problem, the present invention is manufactured as a window paper pulp blended with a window paper pulp and activated carbon, strong and durable in humidity, excellent recovery ability, and also deodorizing, purifying, antibacterial ability The purpose of the present invention is to provide a total heat exchange element of the air conditioner and ventilation unit which is equipped with evenly to improve the quality performance.

이와 같은 목적을 달성하기 위한 본 발명의 기술적 과제는, 지지판과 전열교환판이 교차되게 다층구조로 배열된 공조환기장치의 전열교환엘리먼트에 있어서, 상기 지지판은 닥나무껍질 60%와 아바카 20% 및 일반목재 20%로 배합되고, 그 두께가 1평방미터 당 80g-90g로 제조되며, 상기 전열교환판은 닥나무껍질 90%와 아바카 10%로 배합되고, 그 두께가 1평방미터 당 50g-60g로 제조되며, 상기 지지판 및 상기 전열교환판은 10%-20%의 활성탄이 배합 됨으로써 달성된다.The technical problem of the present invention for achieving the above object, in the heat exchange element of the air conditioning ventilation device arranged in a multi-layer structure in which the support plate and the heat exchange plate intersect, the support plate is 60% of bark bark and 20% of Avaca and general 20% wood, 80g-90g thick per square meter, the heat exchanger plate is 90% mulberry bark and 10% abaca, the thickness is 50g-60g per square meter The support plate and the total heat exchanger plate are manufactured by combining 10% -20% of activated carbon.

도 1은 본 발명 창호지 펄프를 이용하여 공조환기장치의 전열교환엘리먼트를 제작한 일부절개 사시도.1 is a partial cutaway perspective view of a total heat exchange element of the air conditioning ventilation device using the present invention paper pulp.

도 2는 본 발명 공조환기장치의 전열교환엘리먼트에 따른 창호지 펄프가 제조된 상태를 도시한 구성도.Figure 2 is a block diagram showing a state in which the pulp paper pulp according to the total heat exchange element of the air conditioning ventilation device of the present invention.

도 3은 본 발명 공조환기장치의 전열교환엘리먼트에 따른 창호지 펄프에 활성탄이 배합된 상태를 도시한 구성도.Figure 3 is a block diagram showing a state in which activated carbon is blended in the window paper pulp according to the total heat exchange element of the air conditioning ventilation device of the present invention.

도 4는 본 발명 활성탄이 배합된 펄프를 이용하여 공조환기장치의 전열교환엘리먼트를 제작한 상태의 분해사시도.Figure 4 is an exploded perspective view of a state in which the heat exchange element of the air conditioning ventilator is manufactured using the pulp containing the activated carbon of the present invention.

도 5는 본 발명 창호지 펄프 및 활성탄이 배합된 창호지 펄프를 이용하여 공조환기장치의 전열교환엘리먼트가 제작된 상태의 구성도.5 is a block diagram of a state in which the total heat exchange element of the air conditioning ventilation apparatus using the window paper pulp of the present invention window paper pulp and activated carbon.

도 6은 본 발명 창호지 펄프 및 활성탄이 배합된 창호지 펄프를 이용하여 제작된 전열교환엘리먼트가 공조환기장치에 장착된 상태의 구성도.Figure 6 is a block diagram of a state in which the heat exchange element produced by using the window paper pulp and the window paper pulp blended with activated carbon of the present invention mounted on the air conditioning ventilation apparatus.

<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>

30 : 전열교환엘리먼트 31 : 지지판30: heat exchange element 31: support plate

32 : 전열교환판 50 : 활성탄32: electrothermal exchange plate 50: activated carbon

이하, 첨부된 도면을 참조하여 본 발명의 구성 및 그에 따른 작용을 설명하기로 한다.Hereinafter, with reference to the accompanying drawings will be described the configuration of the present invention and its operation.

도 1 내지 도 6에 도시된 바와 같이, 본 발명에 따른 공조환기장치(1)는 내부에 급기팬(10)과 배기팬(20) 및 전열교환엘리먼트(30)가 각각 장착되어 성질이 다른 실,내외 공기를 바꿔주게 된다.As shown in Figures 1 to 6, the air conditioner ventilation apparatus 1 according to the present invention is equipped with an air supply fan 10, an exhaust fan 20 and the heat exchange element 30, respectively, the yarns having different properties. Will change the air inside and outside.

즉, 급·배기팬(10)(20)의 동작으로 온도와 습도가 실외공기와 차이가 있고, 오염된 실내공기는 전열교환엘리먼트(30)의 배기통로(41)를 통과하여 외부로 배출되고, 온도와 습도가 실내공기와 차이가 있고, 신선한 외부공기는 전열교환엘리먼트(30)의 급기통로(40)를 통과하여 실내로 공급된다.That is, the temperature and humidity are different from the outdoor air by the operation of the air supply / exhaust fans 10 and 20, and the contaminated indoor air is discharged to the outside through the exhaust passage 41 of the heat exchange element 30. The temperature and humidity are different from the indoor air, and fresh outside air is supplied to the room through the air supply passage 40 of the total heat exchange element 30.

상기 전열교환엘리먼트(30)는 지지판(31)과 전열교환판(32)으로 이루어진다.The heat exchange element 30 is composed of a support plate 31 and the heat exchange plate (32).

이러한 전열교환엘리먼트(30)의 지지판(31)과 전열교환판(32)의 제조방법을설명하기로 한다.The manufacturing method of the support plate 31 and the heat exchange plate 32 of the heat exchange element 30 will be described.

상기 지지판(31)은 닥나무껍질 60%, 아바카 20%, 일반목재 20%를 혼합비율로 배합한 다음, 그 두께가 1평방미터 당 80g-90g이 유지되어 지지력이 높이지는 창호지 펄프(70)로 제조된다.The support plate 31 is 60% of bark bark, 20% of avaca, 20% of general wood in a blending ratio, then the thickness is maintained 80g-90g per square meter to maintain the support paper pulp (70) Is manufactured.

상기 전열교환판(32)은 닥나무껍질 90%와 아바카 10%를 혼합비율로 배합한 다음, 그 두께가 1평방미터 당 50g-60g이 유지되는 창호지 펄프(70)로 제조되어 온도와 습도의 교환율을 높이게 된다.The heat exchanger plate 32 is made of a window paper pulp 70, which is blended with 90% of bark and 10% of avaca, and then the thickness thereof is maintained in 50g-60g per square meter of temperature and humidity It will increase the exchange rate.

이와 같이 창호지 펄프(70)로 제조된 지지판(31)은 대응되게 다수의 정삼각형이 유지되도록 접은 다음, 정삼각형의 각 꼭지점 부위에 인체에 무해한 접착제를 도포하고, 이에 전열교환판(32)을 부착시키게 된다.As such, the support plate 31 made of the window paper pulp 70 is folded so as to maintain a number of equilateral triangles correspondingly, and then, to each vertex of the equilateral triangle, an adhesive which is harmless to the human body is applied, and the heat exchanger plate 32 is attached thereto. do.

즉, 정삼각형 꼭지점의 상하부 사이에 전열교환판(32)을 접착시킨 다음, 전열교환판(32)의 상하면에 다른 지지판(31)을 교차되도록 접착하게 되면, 지지판(31)과 전열교환판(32) 사이에 급기통로(40)와 배기통로(41)가 교차되게 형성되면서 다층구조로 배열되어 공기통로의 간격을 유지해주는 동시에 격리해주고, 온도와 습도를 교환해주고 공기통로를 격리해주게 된다.(도 1참조)That is, when the heat exchanger plate 32 is bonded between the upper and lower portions of the equilateral triangle vertices, and then the other support plate 31 is bonded to the upper and lower surfaces of the heat exchanger plate 32, the support plate 31 and the heat exchanger plate 32 The air supply passage 40 and the exhaust passage 41 are formed to intersect between each other and are arranged in a multi-layer structure to maintain the separation of the air passages and to isolate, exchange temperature and humidity, and isolate the air passages. 1)

한편, 전열교환엘리먼트(30)의 지지판(31)과 전열교환판(32) 제조시 활성탄(50)을 배합하여 제조하게 된다. 이러한 활성탄(50)은 325매쉬 정도의 분말로 가공되고, 그 혼합비율은 전열교환엘리먼트(30)의 용도에 따라 10%-20%정도로 배합하게 되어 탈취, 정화, 항균 능력이 향상된다. 이때, 펄프가공시 사용되는 산성 및 알카리성 화공약품은 활성탄(50)의 성능을 약화시키는 원인이 됨으로써 산성및 알카리성을 중화시킨 후 첨가하여야 한다.On the other hand, when the support plate 31 and the heat exchange plate 32 of the total heat exchange element 30 is manufactured by mixing the activated carbon (50). The activated carbon 50 is processed into a powder of about 325 mesh, and the mixing ratio thereof is blended at about 10% -20% depending on the use of the total heat exchange element 30 to improve deodorization, purification, and antibacterial ability. At this time, the acidic and alkaline chemicals used in the pulp processing should be added after neutralizing the acidity and alkalinity by causing the performance of the activated carbon (50).

이와 같이 구성된 본 발명에 따른 공조환기장치의 전열교환엘리먼트(30) 제조방법을 설명하기로 한다.A method of manufacturing the total heat exchange element 30 of the air conditioner and ventilation device according to the present invention configured as described above will be described.

도 1 및 도 2에서와 같이, 닥나무껍질 60%, 아바카 20%, 일반목재 20%를 혼합비율로 배합하고, 그 두께가 1평방미터 당 80g-90g이 유지되어 지지력이 높여지는 창호지 펄프(70)로 지지판(31)을 제조하게 된다.As shown in Figures 1 and 2, 60% of bark bark, 20% of avaca, 20% of normal wood in a mixing ratio, the thickness is maintained 80g-90g per square meter to maintain the support paper pulp ( 70 to manufacture the support plate 31.

그리고, 닥나무껍질 90%와 아바카 10%를 혼합비율로 배합하고, 그 두께가 1평방미터 당 50g-60g이 유지되는 창호지 펄프(70)로 전열교환판(32)이 제조되어 온도와 습도의 교환율을 높여주게 된다.Then, 90% of bark and 10% of abaca are mixed in a mixing ratio, and the heat exchange plate 32 is manufactured from window paper pulp 70 whose thickness is maintained at 50 g-60 g per 1 square meter, thereby maintaining the temperature and humidity. It will increase the exchange rate.

이와 같이 창호지 펄프(70)로 제조된 지지판(31)은 등간격으로 접어 대응되게 다수의 정삼각형이 형성되게 한 다음, 정삼각형의 각 꼭지점 부위에 인체에 무해한 접착제를 도포하고, 이에 전열교환판(32)을 부착시키게 된다.As described above, the support plate 31 made of the window paper pulp 70 is folded at equal intervals so that a number of equilateral triangles are formed to correspond to each other, and then an adhesive harmless to the human body is applied to each vertex of the equilateral triangle, and the heat exchanger plate 32 ) Will be attached.

즉, 정삼각형 꼭지점의 상하부 사이에 전열교환판(32)을 접착시킨 다음, 전열교환판(32)의 상하면에 다른 지지판(31)을 그 방향을 전환시켜 접착하게 된다.That is, the heat exchanger plate 32 is bonded between the upper and lower portions of the equilateral triangle vertices, and then the other support plate 31 is changed to the upper and lower surfaces of the heat exchanger plate 32 in the opposite direction to be bonded.

그러면, 지지판(31)과 전열교환판(32) 사이에 급기통로(40)와 배기통로(41)가 교차되게 형성되면서 다층구조로 배열되어 공기통로의 간격을 유지해주는 동시에 격리해주고, 온도와 습도를 교환해주고 공기통로를 격리해 주게 된다.Then, the air supply passage 40 and the exhaust passage 41 are formed to cross between the support plate 31 and the heat exchange plate 32 to be arranged in a multi-layer structure to maintain the separation between the air passage and at the same time, the temperature and humidity Exchange the airflow and isolate the air passage.

한편, 도 3 및 도 4에서와 같이 전열교환엘리먼트(30)의 지지판(31)과 전열교환판(32)의 제조시 활성탄(50)을 배합하여 제조하게 된다. 이러한 활성탄(50)은 325매쉬 정도의 분말로 가공되고, 그 혼합비율은 전열교환엘리먼트(30)의 용도에따라 10%-20%정도로 배합하게 되어 탈취, 정화, 항균 능력이 향상된다. 이때, 펄프가공시 사용되는 산성 및 알카리성 화공약품은 활성탄(50)의 성능을 약화시키는 원인이 됨으로써 산성 및 알카리성을 중화시킨 후 첨가하여야 한다.Meanwhile, as shown in FIGS. 3 and 4, the activated carbon 50 is combined to manufacture the support plate 31 and the heat exchange plate 32 of the heat exchange element 30. The activated carbon 50 is processed into a powder of about 325 mesh, and the mixing ratio thereof is blended at about 10% -20% depending on the use of the total heat exchange element 30 to improve deodorization, purification, and antibacterial ability. At this time, the acidic and alkaline chemicals used in the pulp processing should be added after neutralizing the acidity and alkalinity by causing the performance of the activated carbon (50).

그리고, 도 5 및 도 6에서와 같이 이와 같은 공정으로 제작된 전열교환엘리먼트(30)를 공조환기장치(1) 내부에 장착하여 실,내외공기를 교차하여 통과하게 하면 전열 교환이 이루어진다. 즉, 공조환기장치(1)의 급·배기팬(10)(20) 동작으로 온도와 습도가 실외 공기와 차이가 있고 오염된 실내공기가 전열교환엘리먼트(30)의 배기통로(41)를 통과하여 외부로 배출되고, 온도와 습도가 실내 공기와 차이가 있고 신선한 외부공기는 전열교환엘리먼트(30)의 급기통로(40) 통과하여 실내로 공급됨으로써 전열교환이 이루어지고 창호지 펄프(70)에 배합된 활성탄(50)이 공기를 정화시켜 주게 된다.Then, as shown in Figures 5 and 6 is equipped with the electrothermal exchange element 30 produced in such a process inside the air conditioning ventilator (1) by passing through the room, the inside and outside air, the total heat exchange is made. That is, the operation of the air supply / exhaust fan (10) 20 of the air conditioning and ventilation unit (1), the temperature and humidity is different from the outdoor air and contaminated indoor air passes through the exhaust passage 41 of the total heat exchange element (30). Discharged to the outside, and the temperature and humidity is different from the indoor air, and the fresh outside air is supplied to the room through the air supply passage 40 of the heat exchange element 30 to be heat exchanged, and is mixed with the window paper pulp 70. Activated charcoal 50 purifies the air.

이상에서 상술한 본 발명에 의하면, 공조환기장치의 전열교환엘리먼트를 구성하고 있는 전열교환판과 지지판의 재질 및 소재를 창호지 펄프와 이에 활성탄을 배합하여 제조하게 됨으로써 어떠한 종이 재질보다 습도에 강하면서 질기고, 복원력이 뛰어나게 되었으며, 또한 탈취, 정화, 항균 능력을 고루 갖추게 되어 품질의 성능을 향상시키는 효과가 제공된다.According to the present invention described above, the material and the material of the heat exchanger plate and the support plate constituting the heat exchanger element of the air conditioning ventilator are manufactured by mixing the window paper pulp with activated carbon, which is more resistant to humidity than any paper material. Contribution, resilience is excellent, and deodorizing, cleansing, and antimicrobial ability is also provided to improve the quality performance.

Claims (1)

지지판과 전열교환판이 교차되게 다층구조로 배열된 공조환기장치의 전열교환엘리먼트에 있어서,In the heat exchange element of the air conditioning ventilation device arranged in a multi-layer structure so that the support plate and the heat exchange plate, 상기 지지판(31)은 닥나무껍질 60%와 아바카 20% 및 일반목재 20%로 배합되고, 그 두께가 1평방미터 당 80g-90g로 제조되며,The support plate 31 is compounded with 60% of bark bark and 20% of avaca and 20% of normal wood, the thickness is made of 80g-90g per square meter, 상기 전열교환판(32)은 닥나무껍질 90%와 아바카 10%로 배합되고, 그 두께가 1평방미터 당 50g-60g로 제조되며,The heat exchange plate 32 is formulated with 90% of bark and 10% of acaca, the thickness is made of 50g-60g per square meter, 상기 지지판(31) 및 상기 전열교환판(32)은 10%-20%의 활성탄(50)이 배합된 것을 특징으로 하는 공조환기장치의 전열교환엘리먼트.The support plate 31 and the total heat exchange plate 32 is a total heat exchange element of the air conditioning ventilation apparatus, characterized in that 10% -20% activated carbon (50) is blended.
KR10-2001-0019143A 2001-04-11 2001-04-11 Element of air conditioner system KR100382968B1 (en)

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US7168482B2 (en) 2003-02-03 2007-01-30 Lg Electronics Inc. Heat exchanger of ventilating system

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KR100883546B1 (en) 2007-09-20 2009-02-12 주식회사 성창에어텍 Heat exchanger of heat recovery ventilator

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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