报告了R-22、R-134a、R-410a和R-407c在一个光滑管和三个强化表面管中冷凝时的局部和平均传热系数。这些试管包括一根外径为3/8英寸（9.52毫米）的光滑管、一根外径为3/8英寸（9.52毫米）的微纤管、一根外径为5/16英寸（7.94毫米）的微纤管和一根外径为5/8英寸（15.88毫米）的微纤管。在92100 lb/ft2·h（125 kg/m2·s）至442200 lb/ft2·h（600 kg/m2·s）的质量流量范围内，以及在104°F（40°C）和122°F（50°C）的饱和温度下，测量局部和平均传热系数。对不同制冷剂性能的比较表明，R- 134a的传热性能最高，其次是R-22和R-410a，它们的性能相似。一般来说，R-407c的制冷剂性能最低。在低质量流量下，与光滑管相比，microfin管的传热系数是光滑管的两倍多，但在测试的最高质量流量下，microfin管的传热系数仅增加50%。测量的传热系数也与冷凝的许多关联式进行了比较。单元:双引文:研讨会，ASHRAE交易，第105卷，第。1999年2月2日，西雅图

Local and average heat transfer coefficients during condensation are reported for R-22, R-134a, R-410a, and R-407c in one smooth tube and three enhanced surface tubes. The test tubes included a 3/8 inch (9.52 mm) outer diameter smooth tube, a 3/8 inch (9.52 mm) outer diameter microfin tube, a 5/16 inch (7.94 mm) outer diameter microfin tube, and a 5/8 inch (15.88 mm) outer diameter microfin tube. The local and average heat transfer coefficients were measured over a mass flux range of 92,100 lb/ft2·h (125 kg/m2·s) to 442,200 lb/ft2·h (600 kg/m2·s) and at saturation temperatures of 104°F (40°C) and 122°F (50°C). A comparison of the performance of the different refrigerants reveals that R-134a has the highest heat transfer performance followed by R-22 and R-410a, which have similar performances. In general, R-407c had the lowest performance of the refrigerants tested. The microfin tube more than doubles the heat transfer coefficient compared to the smooth tube for all refrigerants at the low mass fluxes, but it only increases the heat transfer coefficients by 50% at the highest mass flux tested. The measured heat transfer coefficients are also compared with a number of correlations for condensation.Units: Dual