R32/R290在水平管内凝结换热的实验研究

In this paper, an experimental study on the condensation heat transfer coefficient using near-azeotropic refrigerant mixtures of R32/R290 with mass fraction of 68/32 has been conducted. Experimental setup is built to test the heat transfer of R32/R290 in horizon tube with ID 6mm under the mass velocity of 100-250 (kg/m2s) at 55℃, 50℃, 45℃ and 40℃ respectively, in order to analyze the influence of mass velocity and saturation temperature on condensation heat transfer. The results show that with the increase of the mass flow rate and the decrease of the saturation temperature, the condensation heat transfer coefficient increase. Finally, the resultsare also comparewith the condensation heat transfer coefficients which are calculated by the empirical formula of horizontal pipe in engineering design.