Cooling heat transfer characteristics of R744 - Experimental research on the cooling heat transfer and pressure drop in supercritical condition

Masafumi Katsuta, Naoyuki Miyachi, Takahiro Oshiro, Youhei Ohno

    研究成果: Conference contribution

    抄録

    This paper describes the cooling heat transfer and hydraulic characteristics of R744 refrigeration cycle. In this experiment, using R744 as the working refrigerant and the comparison is made between the experimental data and the proposed correlating equations to confirm the cycle simulation method. The main test section is a double tube heat exchanger of a stainless tube with ID of 3.0 mm and 300 mm in length, and the outside tube is used an acrylic tube. Throughout the experiments, it is recognized that heat transfer coefficient reaches its peak value at around the supercritical temperature, and pressure drop increases with rising refrigerant temperature and it increases dramatically at the supercritical condition. Moreover, when the mass flux becomes high, the heat transfer coefficient and the pressure drop increase while the influence of the heat flux is negligible. Finally, it is clear that both of heat and hydraulic characteristics are very sensitive about the effect of the lubricating oil.

    本文言語English
    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: Frontiers of Refrigerants, Heat Transfer and System
    出版社Japan Society of Refrigeration and Air Conditioning Engineering (JSRAE)
    ISBN(印刷版)9781634391252
    出版ステータスPublished - 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
    継続期間: 2010 6月 72010 6月 9

    Other

    Other5th Asian Conference on Refrigeration and Air Conditioning - Green Breeze from Asia: Frontiers of Refrigerants, Heat Transfer and System, ACRA 2010
    CityTokyo
    Period10/6/710/6/9

    ASJC Scopus subject areas

    • 工学(全般)
    • 環境工学

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