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

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Boiling Heat Transfer Characteristics of R-290 in Horizontal Smooth Minichannel

수평미세관내 R-290의 비등열전달 특성

  • Choi, Kwang-Il (Graduate School, Chonnam National University) ;
  • Pamitran, A.S. (Graduate School, Chonnam National University) ;
  • Oh, Jong-Taek (Department of Refrigeration Engineering, Chonnam National University)
  • 최광일 (전남대학교대학원 냉동공학과) ;
  • ;
  • 오종택 (전남대학교 냉동공학과)
  • Published : 2006.11.10
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Abstract

The present paper dealt with an experimental study of boiling heat transfer characteristics of R-290. Pressure gradient and heat transfer coefficient of the refrigerant flow inside horizontal smooth minichannel were obtained with inner tube diameter of 3.0 mm and length of 2,000 mm. The direct electric heating method was applied for supplying a heat to the refrigerant uniformly. The experiments were conducted with R-290 purity of 99.99%, at saturation temperature of 0 to $10^{\circ}C$, a mass flux range of $50{\sim}250kg/m^2s$, and a heat flux range of $5{\sim}20kW/m^2$. The heat transfer coefficients of R-290 increased with increasing mass flux and saturation temperature, wherein the effect of mass flux was higher than that of the saturation temperature. Heat flux has a low effect on the increasing of heat transfer coefficient. The heat transfer coefficient was compared with six existing heat transfer coefficient correlations. The Zhang et al.'s correlation (2004) gave the best prediction of heat transfer coefficient. A new correlation to predict the two-phase flow heat transfer coefficient was developed based on the Chen correlation. The new correlation predicted the experimental data well with a mean deviation of 11.78% and average deviation of -0.07%.

Keywords

References

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