An experimental study on condensation of R744 in a multi-port extruded tube

Daisuke Jige, Ken Kuwahara, Shigeru Koyama

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

    Abstract

    In the present study, the condensation process of R744 in a horizontal multi-port extruded tube was investigated experimentally. The test tube is made of aluminum alloy, and has 22 rectangular channels of 0.36 mm in hydraulic diameter. Experiments were carried out in the mass velocity range of 470 to 950 kg m-2s-1 at 5, 6 and 7 MPa in pressure, respectively. The pressure drop characteristics were measured at the both ends of the test section of approximately 730 mm in length. The local heat transfer characteristics were also measured in eight subsections of 75 mm in effective heat transfer length using heat flux sensors. The measured pressure drop increases as the mass velocity increases and the refrigerant pressure level decreases. These data were compared with several previous correlations. The measured local heat transfer coefficient decreases as the liquid quality increases, while it increases with increase of mass velocity. These data were compared with several correlations. The high quality data agree relatively with correlations of Moser et al. and Cavallini et al., while those of low quality do not agree with any correlations well. Therefore, new heat transfer correlation considering effects of vapor sheared stress and surface tension is developed.

    Original languageEnglish
    Title of host publication5th Asian Conference on Refrigeration and Air Conditioning, ACRA 2010 - Green Breeze from Asia
    Subtitle of host publicationFrontiers of Refrigerants, Heat Transfer and System
    PublisherJapan Society of Refrigeration and Air Conditioning Engineering (JSRAE)
    ISBN (Electronic)9781634391252
    Publication statusPublished - Jan 1 2010
    Event5th Asian Conference on Refrigeration and Air Conditioning - Green Breeze from Asia: Frontiers of Refrigerants, Heat Transfer and System, ACRA 2010 - Tokyo, Japan
    Duration: Jun 7 2010Jun 9 2010

    Publication series

    Name5th Asian Conference on Refrigeration and Air Conditioning, ACRA 2010 - Green Breeze from Asia: Frontiers of Refrigerants, Heat Transfer and System

    Other

    Other5th Asian Conference on Refrigeration and Air Conditioning - Green Breeze from Asia: Frontiers of Refrigerants, Heat Transfer and System, ACRA 2010
    CountryJapan
    CityTokyo
    Period6/7/106/9/10

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    All Science Journal Classification (ASJC) codes

    • Engineering(all)
    • Environmental Engineering

    Cite this

    Jige, D., Kuwahara, K., & Koyama, S. (2010). An experimental study on condensation of R744 in a multi-port extruded tube. In 5th Asian Conference on Refrigeration and Air Conditioning, ACRA 2010 - Green Breeze from Asia: Frontiers of Refrigerants, Heat Transfer and System (5th Asian Conference on Refrigeration and Air Conditioning, ACRA 2010 - Green Breeze from Asia: Frontiers of Refrigerants, Heat Transfer and System). Japan Society of Refrigeration and Air Conditioning Engineering (JSRAE).