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In the present study the local condensation heat transfer characteristics in horizontal micro fin tubes were investigated experimentally with pure refrigerants HFC134a, HCFC123 and HCFC22. From the ex...periments, it was found that the heat transfer coefficients for microfin tubes are about 2 times higher than those of smooth tubes with the same inner diameter. This enhancement effect on heat transfer coefficient seems mainly caused by the enlargement of heat transfer area. From this point of view, a correlation, which is modified from the correlation of Haraguchi et al. for smooth tubes, is proposed for the condensation in microfin tubes with pure refrigerants.続きを見る
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