报道了制冷剂R134a和季戊四醇酯混合酸润滑剂的管内传热系数和蒸发过程中的压降。在光滑管和微翅片管中，在0%到5%的润滑剂浓度范围内，以169 SUS和369 SUS的粘度测试酯润滑剂。使用的平均饱和温度为1摄氏度（33.8华氏度）。在85 kg/m2的质量流量范围内对制冷剂-润滑剂混合物进行测量。在外径为9.52毫米（三/八分之一英寸）的试管中，从6.27万磅/平方英尺（6.27万磅/平方英尺）到375千克/平方米（276640磅/平方英尺）之间。在169的低浓度下，蒸发过程中的传热系数增加- SUS酯润滑剂，然后在光滑管和微翅片管中的润滑剂浓度较高时下降。在测试的润滑剂浓度范围内，较高粘度的369-SUS润滑剂降低了两个管中的传热系数。随着酯润滑剂粘度的增加，光滑管和微翅片管的蒸发压降都增加。微翅片管的传热系数比光滑管高100%到50%，在低质量流量时，传热系数更高。微翅片管中的压降比光滑管中的压降高10%到20%。关键词:热流、传热系数、压降、制冷剂、润滑剂、R134a、混合物、光滑管换热器、翅片管换热器、微量、蒸发、测试、粘度、含量、饱和温度、比较、测量、测试、计算、性能测定: ASHRAE Trans。1994年，第100卷，第2部分，论文编号3809（RP-630），265-282，图12。，8个标签。，裁判。

In-tube heat transfer coefficients and pressure drops during evaporation are reported for mixtures of refrigerant R134a and a penta erythritol ester mixed-acid lubricant. The ester lubricant was tested at viscosities of 169 SUS and 369 SUS over a lubricant concentration range of 0% to 5% in both a smooth tube and a micro-fin tube. The average saturation temperature used was 1 deg C (33.8 deg F). Measurements were taken for the refrigerant-lubricant mixture over a mass flux range of 85 kg/m2.s (62,700 lb/ft2×h) to 375 kg/m2×s (276,640 lb/ft2×h) in test tubes with an outer diameter of 9.52mm (three/eighths in.). Heat transfer coefficients during evaporation increased at low concentrations of the 169-SUS ester lubricant and then dropped off at high lubricant concentrations in both the smooth tube and the micro-fin tube. The higher viscosity 369-SUS lubricant decreased the heat transfer coefficients in both tubes over the range of lubricant concentrations tested. Pressure drops during evaporation increased in both the smooth tube and the micro-fin tube with the addition of ester lubricant viscosity. The heat transfer coefficients for the micro-fin tube were 100% to 50% higher than those for the smooth tube, with the higher values occurring at low mass fluxes. Pressure drops in the micro-fin tube were 10 to 20% higher than those in the smooth tube.KEYWORDS: heat flow, heat transfer coefficient, pressure drop, refrigerants, lubricants, R134a, mixtures, smooth tube heat exchangers, finned tube heat exchangers, micro, evaporation, testing, viscosity, content, saturation temperature, comparing, measuring, testing, calculating, performance