Experimental Study on Flow Boiling of CO<sub>2</sub> and CO<sub>2</sub>-PAG Oil Mixture in Smooth and Micro-fin Tubes

DOI Web Site 13 References
  • KOYAMA Shigeru
    Institute for Materials Chemistry and Engineering, Kyushu University
  • ITO Daisuke
    Interdisciplinary Graduate School of Engineering Sciences, Kyushu University
  • LEE Sang-Mu
    Hatano Plant, Kobelco and Materials Copper Tube, Ltd.
  • KUWAHARA Ken
    Institute for Materials Chemistry and Engineering, Kyushu University
  • SAEKI Chikara
    Hatano Plant, Kobelco and Materials Copper Tube, Ltd.

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Other Title
  • CO<sub>2</sub>及び CO<sub>2</sub>-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
  • CO2及びCO2-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
  • CO2 オヨビ CO2 PAG コンゴウブツ ノ ヘイカツカン オヨビ ミゾツキ カンナイ フットウ ニ カンスル ジッケンテキ ケンキュウ

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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.

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