非共沸混合冷媒HCFC-123/HFC-134aの千鳥配列ローフィン管群における凝縮 Condensation of Downward-Flowing Zeotropic Mixture HCFC-123/HFC-134a on a Staggered Bundle of Horizontal Low-Finned Tubes

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Experiments were conducted to obtain row-by-row heat transfer data during condensation of downward-flowing zeotropic refrigerant mixture HCFC-123/HFC-134a on a 3x15 (columns x rows) staggered bundle of horizontal low-finned tubes. The vapor temperature and the HFC-134a mass fraction at the tube bundle inlet were maintained at about 50°C and 9%, respectively. The refrigerant mass velocity ranged from 9 to 34kg/m<sup>2</sup>s, and the condensation temperature difference from 3 to 12 K. The vapor phase mass transfer coefficient was obtained from the heat transfer data by subtracting the thermal resistance of the condensate film. The heat transfer coefficient and the mass transfer coefficient decreased significantly with decreasing mass velocity. These values first increased with the row number up to the third (or second) row, then decreased monotonically with further increasing row number, and then increased again at the last row. The mass transfer coefficient increased with condensation temperature difference, which was due to the effect of suction associated with condensation. On the basis of the analogy between heat and mass transfer, a dimensionless correlation of the mass transfer coefficient for the 4th to 14th rows was developed.

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 15(1), 63-71, 1998-03-31 

    Japan Society of Refrigerating and Air Conditioning Engineers

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各種コード

  • NII論文ID(NAID)
    10002714380
  • 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
    4447247
  • 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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