介绍了R507、R404a、R408a和四元混合物R32/R125/R143a/R134a等新替代品的传热系数和压降等传热特性，并与R502进行了比较。在传热面积为0.05m2的强化表面管内获得了稳态传热特性数据，实验装置由一台8kW容量的热泵组成。沸腾和冷凝试验期间获得的实验数据表明，与正在研究的制冷剂混合物和R502相比，R-507的传热速率最低。沸腾数据表明，R507比正在研究的制冷剂混合物（包括R502）表现出更高的压降。 然而，冷凝数据表明，在所研究的共混物中，R404a的压降最高。单位:SIKEYWORDS:1997年，热流，性质，制冷剂，混合物，R502，R404a，R408a，R507，R32，R125，R143a，R134a，比较，测量，测试，实验，传热系数，压降，沸腾，冷凝，碳氟化合物裂解:研讨会，ASHRAE交易，第103卷，第2部分，波士顿1997

Heat transfer characteristics such as heat transfer coefficient and pressure drop of new alternatives such as R507, R404a, R408a and the quarternary mixture R32/R125/R143a/R134a are presented and compared to R502. The steady-state data on heat transfer characteristics were obtained inside enhanced surface tubing with a heat transfer area of 0.05m2and the experimental setup was composed of a heat pump with 8kW capacity. Experimental data obtained during boiling and condensation tests show that R-507 has the lowest heat transfer rate compared to the refrigerant blends under investigation and R502. The boiling data demonstrated that R507 exhibited higher pressure drop than the refrigerant mixtures under investigation, including that of R502. However, the condensation data show that R404a has the highest pressure drop among the blends investigated.Units: SIKEYWORDS: year 1997, Heat flow, properties, refrigerants, mixtures, R502, R404a, R408a, R507, R32, R125, R143a, R134a, comparing, measuring, testing, experiment, heat transfer coefficient, pressure drop, boiling, condensation, fluorocarbons