非共沸混合冷媒HFC-32/HFC-125/HFC-134aおよびHFC-32/HFC-134aの水平蒸発管内熱伝達と圧力損失 Heat Transfer and Pressure Drop for Flow Boiling of Non-Azeotropic Refrigerant Mixtures of HFC-32/HFC-125/HFC-134a and HFC-32/HFC-134a in Horizontal Tubes

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著者

    • 森 英夫 MORI Hideo
    • 九州大学工学部機械エネルギー工学科 Department of Energy and Mechanical Engineering, Kyushu University
    • 吉田 駿 YOSHIDA Suguru
    • 九州大学工学部機械エネルギー工学科 Department of Energy and Mechanical Engineering, Kyushu University

抄録

Experiments were performed on heat transfer and pressure drop for flow boiling of two non-azeotropic refrigerant mixtures of HFC-32/HFC-125/HFC-134a and HFC-32/HFC-134a at respectively certain compositions,which are expected to be alternatives to HCFC-22,in horizontal smooth and internally,spirally grooved tubes. Almost the same local heat transfer coefficients were obtained for both the mixtures in each tube. In the smooth tube,in the region where nucleate boiling contributes substantially to the heat transfer,the heat transfer coefficients for the mixtures were reduced down to about two-thirds of the value for HCFC-22,due to the effect of a mass transfer resistance on the heat transfer,while they were approximately equal to those for HCFC-22 in the forced convection dominated region. With the grooved tube,the heat transfer was enhanced over the smooth tube,but the enhancement was smaller than that for HCFC-22. In both the tubes,frictional pressure drops for the binary mixture were generally a few to 20 percent higher than those for the ternary mixture and the pure refrigerant,corresponding to the difference in the vapor density.

収録刊行物

  • 日本冷凍空調学会論文集

    日本冷凍空調学会論文集 14(1), 39-45, 1997-03-31

    公益社団法人 日本冷凍空調学会

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各種コード

  • NII論文ID(NAID)
    10002713961
  • NII書誌ID(NCID)
    AA11125910
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    13444905
  • NDL 記事登録ID
    4184405
  • NDL 雑誌分類
    ZN14(科学技術--機械工学・工業--熱機関)
  • NDL 請求記号
    Z16-1394
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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