Flow boiling heat transfer characteristics of R-22 and R-134a in 0.5, 1.5 and 3.0 mm tubes

Kwang Il Choi, A. S. Pamitran, Jong Taek Oh, Hoo Kyu Oh, Kiyoshi Saito

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish
Title of host publication4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009
PublisherNational Taipei University of Technology
Pages81-86
Number of pages6
ISBN (Print)9868509610, 9789868509610
Publication statusPublished - 2009 Jan 1
Event4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009 - Taipei, Taiwan, Province of China
Duration: 2009 May 202009 May 22

Publication series

Name4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009

Conference

Conference4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009
CountryTaiwan, Province of China
CityTaipei
Period09/5/2009/5/22

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)

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    Choi, K. I., Pamitran, A. S., Oh, J. T., Oh, H. K., & Saito, K. (2009). Flow boiling heat transfer characteristics of R-22 and R-134a in 0.5, 1.5 and 3.0 mm tubes. In 4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009 (pp. 81-86). (4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009). National Taipei University of Technology.