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

The Korean Society of Mechanical Engineers (대한기계학회)
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Condensation and evaporation heat transfer characteristics of HFC-134a in a horizontal smooth and a micro-finned tube

수평 평활관과 마이크로핀 관내에서 HFC-134a의 응축 및 증발열전달 특성

  • 이상천 (영남대학교 공과대학 기계공학과) ;
  • 박병덕 (상주산업대학교 자동차공학과) ;
  • 한운혁 (영남대학교 대학원 기계공학과) ;
  • 이재희 (영남대학교 대학원 기계공학과)
  • Published : 1996.05.01
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Abstract

Experimental condensation and evaporation heat transfer coefficients were measured in a horizontal smooth tube and a horizontal micro-finned tube with HFC-134a. The test sections are straight, horizontal tubes with have a 9.52mm outside diameter and about 5000mm long. The micro-finned tube had 60 fins with a height of 0.12mm and a spiral angle of 25.deg.. The condensation test section was a double-pipe type with counter flow configuration. The evaporation test section employed an electic heating method. Enhancement factors which is defined as a ratio of the heat transfer coefficient for micro-finned tube to that for smooth tube, varied from 1.3 to 1.6(mass flux:110~190kg/m$^{2}$s) for condensation and 1.2 to 1.5 (mass flux:70~160kg/m$^{2}$s) for evaporation. The experimental data of condensation and evaporation heat transfer coefficients were compared to several empirical correlations. Based on these comparisons, modified correlations of the condensation and evaporation heat transfer coefficient for both smooth and micro-finned tubes were proposed.

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References

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