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

Translated title of the contribution: Prediction of Heat Transfer Characteristics of Binary Refrigerant Mixtures in a Falling Film Type Plate-fin Evaporator

屋良 朝康, 小山 繁

    Research output: Contribution to journalArticlepeer-review

    Abstract

    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.
    Translated title of the contributionPrediction of Heat Transfer Characteristics of Binary Refrigerant Mixtures in a Falling Film Type Plate-fin Evaporator
    Original languageJapanese
    Pages (from-to)411-421
    Number of pages11
    Journal日本冷凍空調学会論文集
    Volume24
    Issue number4
    DOIs
    Publication statusPublished - 2007

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