CO_2及びCO_2-PAG混合物の平滑管及び溝付管内沸騰に関する実験的研究

Translated title of the contribution: Experimental Study on Flow Boiling of CO_2 and CO_2-PAG Oil Mixture in Smooth and Micro-fin Tubes

小山 繁, 伊東 大輔, 李 相武, 桑原 憲, 佐伯 主税

    Research output: Contribution to journalArticle

    Abstract

    In this study, experiments on the flow boiling of nearly pure CO<sub>2</sub> and CO<sub>2</sub>-PAG oil mixture are carried out using a 2.064 m long double-pipe counter-flow heat exchanger, in which the refrigerant flows inside the inner tube and the heat source water flows counter-currently in the outer annulus. A smooth copper tube and a micro-fin copper tube are used as the inner tube. In case of nearly pure CO<sup>2</sup>, the present experimental results of heat transfer coefficient in smooth tube with rough surface agree well with the predicted results using Yu et al. correlation [5], in which the surface roughness effect is taken into account. It is also confirmed that the values of heat transfer coefficient for both smooth and micro-fin tubes are almost analogous, while the values of pressure drop for micro-fin tube are slightly higher than those of smooth tube. By comparing the experimental results between nearly pure CO<sup>2</sup> and CO<sup>2</sup>-oil mixture, it is confirmed that the oil concentration effects on heat transfer coefficient and pressure drop in micro-fin tube have different characteristics from those of smooth tube.
    Translated title of the contributionExperimental Study on Flow Boiling of CO_2 and CO_2-PAG Oil Mixture in Smooth and Micro-fin Tubes
    Original languageJapanese
    Pages (from-to)385-393
    Number of pages9
    Journal日本冷凍空調学会論文集
    Volume22
    Issue number4
    DOIs
    Publication statusPublished - Dec 31 2005

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