CONDENSATION HEAT TRANSFER CHARACTERISTICS AND PRESSURE DROP OF R410A AND R22 IN MULTIPORT RECTANGULAR CHANNEL
This study demonstrated the experimental two-phase flow condensation heat transfer of R410A and R22 in multiport tubes. The data are conducted with the heat flux range from 3 to 15 kW/m2, mass flux range of 50 to 300 kg/(m2s), saturation temperature of 48°C, and quality up to 1.0. The test sections made from aluminum multiport tubes with hydraulic diameters of 0.82 mm, 1.11 mm and 1.12 mm. The effects of mass flux, heat flux and aspect ratio of channel on heat transfer coefficient and pressure drop are illustrated and analysed. The experimental heat transfer coefficients are compared with some well-known existing correlations. Finally, a new condensation heat transfer coefficient correlation for R-410A and R22 in multiport-tube is proposed in this study.