Condensation Heat Transfer of Pure Refrigerants in Microfin Tubes

Abstract

In the present study the local condensation heat transfer characteristics in a horizontal microfin tube are found to be about 2 times higher than those of a smooth tube with the same inner diameter.This enhancement effect on heat transfer coefficient seems mainly caused by the enlargement ratio 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 developed for the condensation heat transfer in microfm tubes with pure refrigerants.With this correlation, the condensation heat transfer characteristics in some kinds of microfin tubes can be predicted very well.