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 journalArticle

    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.
    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

    Fingerprint

    Fins (heat exchange)
    Refrigerants
    Evaporators
    Heat transfer
    Pressure drop
    Evaporation
    Phase equilibria
    Heat transfer coefficients
    Heat exchangers
    Heat flux
    Shear stress
    Friction

    Cite this

    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.

    In: 日本冷凍空調学会論文集, Vol. 24, No. 4, 2007, p. 411-421.

    Research output: Contribution to journalArticle

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    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 and mass velocity from 50 to 100 kg/m<Sup>2s. 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.",
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    AB - 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 and mass velocity from 50 to 100 kg/m<Sup>2s. 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.

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