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

The Korean Society of Mechanical Engineers (대한기계학회)
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Condensing Heat Transfer Characteristics of R-22 and R-134a in Small Diameter Tubes

세관내 R-22와 R-134a의 응축 전열 특성에 관한 연구

  • 홍진우 (부경대학교 대학원 냉동공조공학과) ;
  • 노건상 (동명대학 가스냉동과) ;
  • 정재천 ((주)한서 엔지니어링) ;
  • 오후규 (부경대학교 냉동공조공학과)
  • Published : 2001.01.01
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Abstract

Condensing heat transfer coefficients of R-22 and R-134a were measured in smooth, horizontal copper tubes with inner diameters of 1.77mm, 3.36mm, and 5.35mm, respectively. The experiments were conducted in the closed loop, which was driven by a magnetic gear pump. Data are presented for the following range of variables : mass velocity from 200 to 500kg/$m^2$.s and quality from 0 to 1.0. The heat transfer coefficients in the small diameter tubes (ID < 7mm) were observed to be strongly affected by various diameters and the heat transfer characteristics in the small diameter tubes differed from those in the large diameter tubes. Heat transfer coefficients in the small diameter tubes are higher than those in the large diameter tubes at the same experimental condition. It was found that some well-known previous correlations(Shahs correlation and Cavallini-Zecchins correlation) were not suitable for small diameter tubes.

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References

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