本文报道了R-22、R-134a、R-410a和R-407c在三个增强管和一个光滑管中冷凝时的压降。试管为3/8英寸外径光滑管、3/8英寸外径微纤管、5/16英寸外径微纤管和5/8英寸外径微纤管。在四个质量流量、两个饱和温度和试管中的一系列平均质量条件下报告压降。R-410a的压降比R-22在两个管中的压降低约40%。R-407c的压降比R-22低10%到20%，而R-134a的压降比R-22稍大。对于所有制冷剂，微细管的压降平均比光滑管的压降高40%到80%。结果表明，微管道的压降损失随质量的提高而降低。 单元:双引文:研讨会，ASHRAE交易，第105卷，第。1999年2月2日，西雅图

This paper reports pressure drops during condensation for R-22, R-134a, R-410a, and R-407c in three enhanced tubes and one smooth tube. The test tubes were a 3/8 inch outer diameter smooth tube, a 3/8 inch outer diameter microfin tube, a 5/16 inch outer diameter microfin tube, and a 5/8 inch outer diameter microfin tube. Pressure drops are reported at four mass fluxes, at two saturation temperatures, and over a range of average qualities in the test tubes. The pressure drops for R-410a were approximately 40% lower than those of R-22 in both tubes. R-407c had 10% to 20% lower pressure drops than R-22, while R-134a had slightly larger pressure drops than R-22. The microfin tube pressure drops were, on average, 40% to 80% higher than those for the smooth tube for all refrigerants. The pressure drop penalty of the microfin tube was shown to decrease with increased quality.Units: Dual