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

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Condensation Heat Transfer and Pressure Drop of R245fa in a Plate-shell Heat Exchanger

Plate-shell 열교환기에서 R245fa의 응축열전달 및 압력강하 특성에 관한 연구

  • Kim, Sung Woo (Department of Mechanical Engineering, Graduate School Korea University) ;
  • Baek, Changhyun (Department of Mechanical and Control Engineering, The Cyber University of Korea) ;
  • Song, Kang Sub (Department of Mechanical Engineering, Graduate School Korea University) ;
  • Kim, Yongchan (Department of Mechanical Engineering, Korea University)
  • 김성우 (고려대학교 기계공학과 대학원) ;
  • 백창현 (고려사이버대학교 기계제어공학과) ;
  • 송강섭 (고려대학교 기계공학과 대학원) ;
  • 김용찬 (고려대학교 기계공학과)
  • Received : 2016.07.18
  • Accepted : 2016.10.12
  • Published : 2016.12.10
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Abstract

Condensation heat transfer and pressure drop of R245fa were investigated experimentally in a plate-shell heat exchanger which consisted of thirty seven counter flow channels formed by thirty-eight plates with a chevron angle of $50^{\circ}$. The upflow of the water in one channel receives heat from the downflow of R245fa in the other. The effects of refrigerant mass flux, imposed heat flux, refrigerant saturation pressure, and mean vapor quality on the heat transfer characteristics were explored in detail. Experimental correlations were proposed to predict the condensation heat transfer coefficient and friction factor in terms of the Boiling number, Reynolds number, and Prandtl number. In the experiments, the mean vapor quality in the refrigerant channel was varied from .22 to .82, mass flux from 3 to $5kg/m^2$, imposed heat flux from 1 to $3kW/m^2$, and system pressure from .61 to .81 MPa.

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References

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