An Experimental Investigation of Condensation Heat Transfer Coefficient Using R-410A in Horizontal Circular Tubes

Abstract

Condensation heat transfer coefficient has been evaluated experimentally on the tube side of three different circular tubes with inner diameter of 6.61, 7.5 and 9.2 mm, respectively. Two-phase fluid flow conditions include mass fluxes from 200 to 320 kg/m2s, qualities between 0.1 to 0.9, and heat flux range from 5 to 20 kW/m2 at a fixed saturation temperature of 48oC. Results showed that the average heat transfer coefficient increased with the increase of vapor quality, mass flux and heat flux, but decreased with inner diameter. The experiment results are compared with the existing heat transfer coefficient correlations, and a new correlation is developed with good prediction.