Evaporating heat transfer characteristics of R744 -relation between the evaporating heat transfer and flow pattern of refrigerant with oil

Masafumi Katsuta, Shinya Kishi, Naoyuki Miyachi, Takahiro Oshiro, Ryouichi Takai

    研究成果: Conference contribution

    抄録

    This paper describes evaporating heat transfer characteristics of a refrigeration cycle. Using R744 as working refrigerant, the effect of the oil mixing rate on the thermal and hydraulic characteristics were investigated. The main test section was a stainless tube an ID of 3.0 mm and the length of 500 mm, which was directly heated by electricity from an electric pole. Further, in order to visualize the flow pattern of the mixture of refrigerant and oil, we placed behind the evaporator sight glass made of acrylic block of 3.0 mm in ID and 135mm in length. Throughout experiments, it was recognized that oil was a significant factor of the heat transfer deterioration and of the increase of pressure drop. In addition, it was observed that the transition of the flow pattern was accelerated as oil concentration increases. Finally, it was concluded that the transition of the flow pattern was influenced by the mass flux and the oil concentration.

    本文言語English
    ホスト出版物のタイトル4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009
    出版社National Taipei University of Technology
    ページ305-310
    ページ数6
    ISBN(印刷版)9868509610, 9789868509610
    出版ステータスPublished - 2009
    イベント4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009 - Taipei
    継続期間: 2009 5 202009 5 22

    Other

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

    ASJC Scopus subject areas

    • 化学工学(その他)

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