대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)

  • 제41권1호
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  • Pages.21-28
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  • 2017
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  • 1226-4881(pISSN)
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  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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플라스틱 필름/종이 복합 재질의 직교류 간접증발소자

Cross Flow Indirect Evaporative Cooler Made of a Plastic Film/Paper Composite

  • Kim, Nae-Hyun (Dept. of Mechanical Engineering, Incheon Nat'l Univ.)
  • 투고 : 2016.08.15
  • 심사 : 2016.10.16
  • 발행 : 2017.01.01
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초록

물의 증발에 따른 냉각 효과를 이용하는 증발냉각방식은 기존 증기 압축식 방식에 비하여 냉방에 소요되는 에너지를 현저히 감소시킬 수 있고 CFC 냉매를 사용하지 않아 친환경적이다. 본 연구에서는 습채널의 물 퍼짐성이 개선된 플라스틱/종이 재질로 크기 $300mm{\times}300mm{\times}300mm$, 채널 핏치 $5mm{\times}5mm$, $5mm{\times}7mm$, $7mm{\times}7mm$의 직교류 간접증발소자를 제작하고 간접증발효율 및 압력 손실을 측정하였다. 간접증발효율은 채널 핏치가 가장 작은 $5mm{\times}5mm$ 소자의 가장 크게 나타났다. 이는 작은 $5mm{\times}5mm$ 소자의 전열 면적이 가장 크기 때문이다. 또한 간접증발소자 설치로 인해 절약되는 에너지도 $5mm{\times}5mm$ 소자에서 가장 크게 나타났다. 한편 습채널의 압력 손실은 건채널의 값보다 크게 나타났다. 이론 해석 모델은 간접증발효율과 압력손실을 과소 예측하였다.

Indirect evaporative cooling, which utilizes a cooling effect obtained by the evaporation of water, is energy-effective compared to the conventional vapor compression method. It is also eco-friendly, due to the non-usage of CFC refrigerant. In this study, three indirect evaporative cooler samples of the cross flow type(size: $300mm{\times}300mm{\times}300mm$, channel pitch: $5mm{\times}5mm$, $5mm{\times}7mm$, $7mm{\times}7mm$) were made using plastic/paper composites. Tests were conducted to measure indirect evaporative efficiencies and pressure drops. Results showed that the efficiency was the highest for the $5mm{\times}5mm$ sample, owing to the largest surface area. The saved electrical energy was also the greatest for that sample. The pressure drop of the wet channel was larger than that of the dry channel as expected. A theoretical model was proposed, which underestimated both the indirect evaporation efficiency and the pressure drop.

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