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 journalArticlepeer-review

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