低GWP混合冷媒R 32/R 1234ze(E)の水平ら旋溝付管内凝縮および蒸発特性

Translated title of the contribution: Condensation and Evaporation of Low GWP Refrigerant Mixture R 32/R 1234ze(E) in Horizontal Microfin Tubes

近藤 智恵子, 三島 文也, 小山 繁

    Research output: Contribution to journalArticle

    Abstract

    Heat transfer characteristics of a potential refrigerant R 32/R 1234ze(E) in horizontal microfin tubes are experimentally investigated in this study. The heat transfer coefficient (HTC) and pressure drop are measured at saturation temperatures 40 and 10 °C for condensation and evaporation, respectively. The HTC of R 1234ze(E) is lower than that of R 32, as predicted by several correlations. Degradation in the HTC of the R 32/R 1234ze(E) mixture is significant; the HTC is even lower than that of R 1234ze(E). During condensation and evaporation process, the HTC is minimized at compositions 0.5/0.5 and 0.2/0.8 by mass fraction, respectively. The magnitude of heat transfer degradation by the volatility differences is much severer for evaporation than condensation.
    Original languageJapanese
    Pages (from-to)401-411
    Number of pages11
    Journal日本冷凍空調学会論文集
    Volume30
    Issue number4
    DOIs
    Publication statusPublished - 2013

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