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

Daisuke Jige, Ken Kuwahara, Shigeru Koyama

    研究成果: Chapter in Book/Report/Conference proceedingConference contribution

    抄録

    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.

    本文言語英語
    ホスト出版物のタイトル5th Asian Conference on Refrigeration and Air Conditioning, ACRA 2010 - Green Breeze from Asia
    ホスト出版物のサブタイトルFrontiers of Refrigerants, Heat Transfer and System
    出版社Japan Society of Refrigeration and Air Conditioning Engineering (JSRAE)
    ISBN(電子版)9781634391252
    出版ステータス出版済み - 2010
    イベント5th Asian Conference on Refrigeration and Air Conditioning - Green Breeze from Asia: Frontiers of Refrigerants, Heat Transfer and System, ACRA 2010 - Tokyo, 日本
    継続期間: 6 7 20106 9 2010

    出版物シリーズ

    名前5th Asian Conference on Refrigeration and Air Conditioning, ACRA 2010 - Green Breeze from Asia: Frontiers of Refrigerants, Heat Transfer and System

    その他

    その他5th Asian Conference on Refrigeration and Air Conditioning - Green Breeze from Asia: Frontiers of Refrigerants, Heat Transfer and System, ACRA 2010
    Country日本
    CityTokyo
    Period6/7/106/9/10

    All Science Journal Classification (ASJC) codes

    • Engineering(all)
    • Environmental Engineering

    フィンガープリント 「An experimental study on condensation of R744 in a multi-port extruded tube」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

    引用スタイル