TY - GEN
T1 - Flow boiling heat transfer characteristics of R-22 and R-134a in 0.5, 1.5 and 3.0 mm tubes
AU - Choi, Kwang Il
AU - Pamitran, A. S.
AU - Oh, Jong Taek
AU - Oh, Hoo Kyu
AU - Saito, Kiyoshi
PY - 2009
Y1 - 2009
N2 - An experimental study of R-22 and R-134a two-phase vaporization in horizontal minichannel was reported. In order to obtain the local heat transfer coefficients, the test was ran under heat flux range of 10 to 40 kW m -2, mass flux range of 200 to 600 kg m-2 s-1, saturation temperature range of 5 to 10°C, and quality up to 1.0. The test section, which was made of stainless steel tube and heated uniformly by applying an electric current to the tube directly, has inner tube diameters of 0.5, 1.5 and 3.0 mm, and lengths of 0.33 and 2.0 m. The effects on heat transfer coefficient of mass flux, heat flux and inner tube diameter were presented. The experimental heat transfer coefficients were compared with the predictions using existing heat transfer coefficient correlations. A new boiling heat transfer coefficient correlation based on the superposition model, with considering the laminar flow, was developed.
AB - An experimental study of R-22 and R-134a two-phase vaporization in horizontal minichannel was reported. In order to obtain the local heat transfer coefficients, the test was ran under heat flux range of 10 to 40 kW m -2, mass flux range of 200 to 600 kg m-2 s-1, saturation temperature range of 5 to 10°C, and quality up to 1.0. The test section, which was made of stainless steel tube and heated uniformly by applying an electric current to the tube directly, has inner tube diameters of 0.5, 1.5 and 3.0 mm, and lengths of 0.33 and 2.0 m. The effects on heat transfer coefficient of mass flux, heat flux and inner tube diameter were presented. The experimental heat transfer coefficients were compared with the predictions using existing heat transfer coefficient correlations. A new boiling heat transfer coefficient correlation based on the superposition model, with considering the laminar flow, was developed.
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M3 - Conference contribution
AN - SCOPUS:84907416895
SN - 9868509610
SN - 9789868509610
T3 - 4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009
SP - 81
EP - 86
BT - 4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009
PB - National Taipei University of Technology
T2 - 4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009
Y2 - 20 May 2009 through 22 May 2009
ER -