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

  • 제35권3호
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  • Pages.269-278
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  • 2011
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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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구리 재질의 평판 핀과 나선형 핀이 사용된 핀-관 열교환기의 공기측 성능

Air-Side Performance of Fin-and-Tube Heat Exchanger with Copper Plate or Copper Spiral Fins

  • Lee, Jin-Wook (Dept. of Mechanical Engineering, Univ. of Incheon) ;
  • Park, Ji-Hoon (Dept. of Mechanical Engineering, Univ. of Incheon) ;
  • Lee, Jung-Pyo (Dept. of Mechanical Engineering, Univ. of Incheon) ;
  • Kim, Nae-Hyun (Dept. of Mechanical Engineering, Univ. of Incheon)
  • 투고 : 2010.09.06
  • 심사 : 2011.01.21
  • 발행 : 2011.03.01
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초록

본 연구에서는 구리 재질의 평판 핀과 나선형 핀-관 열교환기에 대하여 핀 피치와 열수의 변화에 따른 공기측 전열성능을 검토하였다. 두 형상 모두 핀 피치가 열전달계수에 미치는 영향은 미미하였다. 마찰인자는 핀 피치가 증가하면 증가하였다. 열수가 미치는 영향은 형상에 따라 다르게 나타났다. 평판 핀-관 열교환기의 경우 열전달계수는 열수가 증가할수록 감소하였다. 하지만 나선형 핀-관 열교환기의 열전달 계수는 열수가 증가하면서 그 값이 증가하는 경향을 보였다. 평판 핀-관 열교환기의 열전달계수는 나선형 핀-관 열교환기의 열전달계수보다 높게 나타났다. 하지만 열수가 증가하면 그 차이가 줄어들어 4열이 되면 거의 같았다. 한편 마찰인자는 평판 핀-관 열교환기에서 다소 높게 나타나고 열수의 영향은 크지 않았다. 본 실험 데이터를 기존 상관식의 예측치와 비교하였다.

We investigate the heat-transfer and pressure-drop characteristics of fin-and-tube heat exchangers with a copper plate or copper spiral fins. Twenty-four samples with different fin pitches and tube rows were tested. For both configurations, the effect of the fin pitch on the j factor is negligible, and the f factor increases with the fin pitch. The effect of the tube row depends on the configuration. For plate fin-and-tube heat exchangers, the j factor decreases as the row number increases; the reverse is true for spiral exchangers. We explain this by considering the flow pattern. The j factor for plate fin-and-tube heat exchangers is larger than that for spiral exchangers, and the difference decreases as the row number increases. The f factor of the plate fin-and-tube heat exchanger is also larger. We compare our results with existing predictions of correlations.

키워드

참고문헌

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