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

The Korean Society of Mechanical Engineers (대한기계학회)
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An Experimental Study on the Evaporative Heat Transfer Characteristics of R-134a in a Micro-Channel Heat Exchanger

마이크로채널 열교환기에서 R-134a의 증발열전달 특성에 관한 실험적 연구

  • Lee, Hae-Seung (Dept. of Mechanical Engineering, Korea Univ.) ;
  • Jeon, Dong-Soon (Energy System Technology Center, Korea Institute of Industrial Technology) ;
  • Kim, Young-Lyoul (Energy System Technology Center, Korea Institute of Industrial Technology) ;
  • Kim, Yong-Chan (Dept. of Mechanical Engineering, Korea Univ.) ;
  • Kim, Seon-Chang (Energy System Technology Center, Korea Institute of Industrial Technology)
  • 이해승 (고려대학교 기계공학과) ;
  • 전동순 (한국생산기술연구원 에너지설비센터) ;
  • 김영률 (한국생산기술연구원 에너지설비센터) ;
  • 김용찬 (고려대학교 기계공학과) ;
  • 김선창 (한국생산기술연구원 에너지설비센터)
  • Published : 2010.02.01
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Abstract

An experimental investigation was carried out to examine the evaporative heat transfer characteristics of R-134a in a micro-channel heat exchanger. The micro-channel heat exchanger used in this study was a sort of plate heat exchanger. Micro-channels were fabricated on the SUS304 plate by the photo-etching process: 13 sheets of plates were stacked and bonded by the diffusion bonding process. The effects of the evaporating temperature, mass flux of R-134a, and inlet temperature of water were examined. As the difference between the inlet temperatures of R-134a and water increased, the heat transfer rate increased. The evaporative heat transfer coefficients obtained in this study range from 0.67 to 6.23 kW/$m^2{\cdot}^{\circ}C$. The experimental correlation for the Nusselt number as a function of the Reynold number and $\Theta$ was suggested for the micro-channel heat exchanger.

마이크로채널 열교환기에서 R-134a의 증발열전달 특성에 관하여 실험적 연구를 수행하였다. 마이크로채널은 금속박판인 SUS304에 포토에칭 공정으로 식각되었으며, 13개의 금속박판은 차례로 적층되어 확산접합공정을 통하여 접합되었다. 본 연구에서는 R-134a의 증발온도, 질량유속 그리고 물의 입구온도의 변화에 따른 열전달 특성을 대향류 조건에서 실험하였다. 실험결과 R-134a와 물의 입구온도차가 클수록 증발열전달량은 증가하였으며, 증발열전달계수는 0.67 kW/$m^2{\cdot}^{\circ}C$에서 6.23 kW/$m^2{\cdot}^{\circ}C$이었다. 아울러 마이크로채널 열교환기에서 R-134a와 물의 열교환에 따른 증발열전달 특성에 영향을 미치는 Reynold수와 무차원 온도비 $\Theta$를 도출하여 Nusselt수에 관한 실험적 상관식을 제안하였다.

Keywords

References

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