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.
    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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    Boiling liquids
    Heat transfer coefficients
    Fins (heat exchange)
    Pressure drop
    Copper
    Heat exchangers
    Flow of fluids
    Surface roughness
    Pipe
    Oils
    Water
    Experiments
    Hot Temperature

    Cite this

    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. / 小山繁; 伊東大輔; 李相武; 桑原憲; 佐伯主税.

    In: 日本冷凍空調学会論文集, Vol. 22, No. 4, 31.12.2005, p. 385-393.

    Research output: Contribution to journalArticle

    小山繁 ; 伊東大輔 ; 李相武 ; 桑原憲 ; 佐伯主税. / 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. In: 日本冷凍空調学会論文集. 2005 ; Vol. 22, No. 4. pp. 385-393.
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    abstract = "In this study, experiments on the flow boiling of nearly pure CO2 and CO2-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 CO2, 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 CO2 and CO2-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.",
    author = "繁 小山 and 大輔 伊東 and 相武 李 and 憲 桑原 and 主税 佐伯",
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    AU - 小山, 繁

    AU - 伊東, 大輔

    AU - 李, 相武

    AU - 桑原, 憲

    AU - 佐伯, 主税

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    AB - In this study, experiments on the flow boiling of nearly pure CO2 and CO2-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 CO2, 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 CO2 and CO2-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.

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    M3 - 記事

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    SN - 1344-4905

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