流下液膜式プレートフィン蒸発器内での二成分混合冷媒の伝熱特性の予測計算法

屋良 朝康, 小山 繁

    研究成果: ジャーナルへの寄稿記事

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    This paper deals with the characteristics of heat transfer and pressure drop of R 22, R 134a pure refrigerant and R 134a/R123 refrigerant mixtures in a falling film type plate-fin evaporator. The refrigerants have been tested in the ranges of heat flux from 3 to 20 kW/m<Sup>2</Sup> and mass velocity from 50 to 100 kg/m<Sup>2</Sup>s. It is clarified that heat transfer characteristics of evaporation in the present experimental range are not affected by shear stress. Taking the fin efficiency into consideration, a correlation equation of heat transfer coefficient is proposed. The characteristic of pressure drop is also proposed by modifying friction factor of Soliman's equation. Furthermore, a prediction model for evaporation of mixtures in a plate fin heat exchanger is developed based on the assumption that the phase equilibrium in a cross-section of the refrigerant path is established. The prediction results are in good agreement with the experimental data.
    元の言語Japanese
    ページ(範囲)411-421
    ページ数11
    ジャーナル日本冷凍空調学会論文集
    24
    発行部数4
    DOI
    出版物ステータス出版済み - 2007

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