Experimental study of condensation heat transfer of R-134a flow in corrugated tube: with different inclinations

摘要

This experimental study is performed to investigate condensation heat transfer coefficient of R-134a flow inside corrugated tube with different inclinations. Different inclinations of test condenser ranging from-90° to +90° and various flow mass velocities in the range of 87 to 253 [kg/m~2s] are considered in this study. Data analysis showed that change in the tube inclination had a significant effect on condensation heat transfer behavior. At low mass velocities, and low vapor qualities, the highest condensation heat transfer coefficient was obtained for α= +30° which was 1.41 times greater than the least one obtained for α=-90°. The results also showed that at all mass velocities, the highest average heat transfer coefficients were achieved for α= + 30. Based on the experimental results, a new empirical correlation is proposed to predict the condensation heat transfer coefficient of R134a flow in corrugated tubes with different inclinations.