二成分非共沸混合冷媒の水平平滑管内凝縮

DOI Web Site 参考文献17件
  • 小山 繁
    九州大学機能物質科学研究所
  • 兪 堅
    九州大学機能物質科学研究所
  • 石橋 晃
    三菱電機株式会社住環境研究開発センター

書誌事項

タイトル別名
  • Condensation of Binary Zeotropic Refrigerant Mixtures inside a Horizontal Smooth Tube
  • 二成分非共沸混合冷媒の水平平滑管内凝縮--局所熱伝達・物質伝達特性の予測計算法
  • 2セイブン ヒキョウフツ コンゴウ レイバイ ノ スイヘイ ヘイカツカン ナイ ギョウシュク キョクショ ネツ デンタツ ブッシツ デンタツ トクセイ ノ ヨソク ケイサンホウ
  • -局所熱伝達・物質伝達特性の予測計算法-
  • -Prediction Model for Local Characteristics of Heat and Mass Transfer

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抄録

In the present study, a prediction model for condensation of binary zeotropic refrigerant mixtures inside a horizontal smooth tube is proposed. In this model the following assumptions are employed : (1) The phase equilibrium is established at the vapor-liquid interface, while the bulk vapor is saturated and the bulk liquid is subcooled. (2) The heat transfer coefficients in liquid film and the frictional pressure drop are calculated by the correlations for pure refrigerants proposed by Haraguchi et al. (3) The mass transfer coefficient in the liquid film is infinite, and the mass transfer coefficient in the vapor core is estimated by a correlation that is derived from the correlation of the frictional pressure drop, based on the Chilton-Colburn analogy.<br>The predicted results are compared with the experimental ones for the condensation of HFC134a/HCFC 123 and HCFC22/CFC 114 mixtures. The predicted heat flux distribution along the tube axis is in good agreement with that of the experiment, and the calculated values of condensing length agree well with the experimental ones. Using the present model, the local mass fraction distribution, the diffusion mass flux and the mass transfer characteristics in both vapor and liquid phase are also demonstrated. From these results, the effect of mass transfer resistance on condensation heat transfer characteristics is clarified.

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