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Analysis of heat transfer coefficient during refrigerant condensation in vertical pipe minichannel

Bohdal T., Kruzel M., Sikora M.

Journal of Mechanical and Energy Engineering

2017

Vol. 1, No 1

65--70

This article presents the results of experimental research of R404A, R407C and R410A high-pressure refrigerants condensation in vertical pipe minichannels with an internal diameter d below 2,5 mm. The study determined the local and average heat transfer coefficient in the full range of vapor quality, x= 1-0. On the basis of experimental investigations, the dependence of heat transfer coefficient on the vapor quality x, the mass flux density G and the channel internal diameter d was obtained.