二成分混合冷媒のプレートフィン凝縮器内での伝熱特性の予測計算法

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  • Prediction of Heat Transfer Characteristics of Binary Refrigerant Mixtures in a Plate-Fin Condenser
  • 二成分混合冷煤のプレートフィン凝縮器内での伝熱特性の予測計算法
  • 2セイブン コンゴウレイバイ ノ プレート フィン ギョウシュクキ ナイ デ ノ デンネツ トクセイ ノ ヨソク ケイサンホウ

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The heat transfer characteristics of binary refrigerant mixtures in a plate-fin condenser are experimentally investigated using a vapor compression heat transformer, in which binary refrigerant mixtures of R 134a/ R 123 are used as the working fluid and water is used as both heat sink and source. Pure refrigerants of R 22 and R 134a are also tested as the working fluid. The experimental ranges of heat flux and mass velocity are from 2 to 20 kW/m2 and from 50 to 100 kg/m2s, respectively. The heat transfer characteristics of the condensation and vapor single-phase flow of pure and mixed refrigerants are discussed, and empirical correlation equations of the condensate heat transfer and vapor single-phase heat transfer are proposed. The correlation equation of water-side heat transfer is also presented. Combining these correlation equations with a correlation equation of vapor mass transfer based on the Chilton-Colburn analogy, a prediction model for condensation of the binary refrigerant mixtures in a plate-fin heat exchanger is developed based on the assumption that the phase equilibrium is only established at the vapor-liquid interface. The calculation results for the pure and mixed refrigerants agree well with the present experimental data. The mass transfer characteristics are also revealed from the calculation results.

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