Journal of Enhanced Heat Transfer Theory and Application in High Performance Heat and Mass Transfer

ISSN for PRINT: 1065-5131

For Online Access

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2004, Volume11

Issue 4

232 pages

DOI: 10.1615/JEnhHeatTransf.v11.i4

Issue price - $138.00

Xiaomin Wu
Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, P. R. China

Xiaoliang Wang
Department of Thermal Engineering, Tsinghua University, Beijing 100084, China

Weicheng Wang
Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, P. R. China

Condensation heat transfer coefficients and pressure drops of R22 in two microfin tubes with 5-mm outside diameter (OD) and a smooth tube with 5.4-mm OD were experimentally investigated. The main difference in geometries of the two microfin tubes was the helix angle: one had a helix angle of 7°, and the other had a helix angle of 18°. The test section had a length of 3.0 m and was divided into five subsections to achieve the local heat transfer coefficient. The condensation tests were carried out at 45 °C condensation temperature for 200−500 kg/m²s refrigerant mass fluxes with 5−30 °C inlet superheat degrees and 2−3 °C outlet subcooling degrees. The effects of helix angle and mass flux on the heat transfer coefficients and pressure drop are presented and discussed.

DOI: 10.1615/JEnhHeatTransf.v11.i4.40 Download article, 275-282 pages

Article price - $35.00

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