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
    Event4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009 - Taipei
    Duration: 2009 May 202009 May 22

    Other

    Other4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009
    CityTaipei
    Period09/5/2009/5/22

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    ASJC Scopus subject areas

    • Chemical Engineering (miscellaneous)

    Cite this

    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). National Taipei University of Technology.