Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Effect of Expansion Ratio on Contact Heat Transfer Coefficient in Fin-Tube Heat Exchanger

핀관 열교환기에서 확관율이 접촉열전달계수에 미치는 영향

  • Lee, Sang-Mu (Living Environment System Lab., Mitsubishi Electric Corp.) ;
  • Park, Byung-Duck (Department of Automotive Engineering, Kyungpook National University)
  • 이상무 (미쯔비시전기 주환경연구소) ;
  • 박병덕 (경북대학교 자동차공학부)
  • Received : 2011.08.09
  • Accepted : 2011.11.22
  • Published : 2012.01.10
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Abstract

The plate fin and tube type of heat exchanger is widely used in air conditioner, and the heat exchanger is assembled by the mechanical expansion of copper tubes and fastening the aluminum fin. The objective of the present study is to investigate how the mechanical expansion of copper tube affects on the heat transfer performance of a plate fin and tube type heat exchanger. This study has been performed by experimental and numerical methods. The numerical and experimental results show that the tube expansion ratio has a influence on the heat transfer performance. Within the tested expansion ratio, the contact pressure shows the peak value and it decreases as the expansion ratio increases. Air-side heat transfer coefficient increases until the expansion ratio reaches 1.23, and then decreases with the similar pattern to the contact pressure. Also, contact heat transfer coefficient shows the maximum when the contact pressure is highest as well as the air-side heat transfer coefficient.

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References

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