实验测定了HFC134a和CFC12的蒸发和冷凝管内传热系数和压降。这些测量是针对0%至5.4%润滑剂浓度范围内的制冷剂-润滑剂混合物进行的。对于HFC134a，润滑剂为165 SUS聚烷基乙二醇（PAG），而对于CFC12，润滑剂为150 SUS环烷油。蒸发试验在5摄氏度（41华氏度）下进行，冷凝试验在40摄氏度（104华氏度）下进行，质量流量范围为130千克/平方米。s（95860磅/英尺2.h）至400千克/平方米。s（294000磅/英尺2.h）。这些测试是在一个3小时的实验室中进行的。 67米（12英尺）长的光滑管，内径为8.0毫米（0.31英寸）。HFC134a和CFC12的蒸发传热系数在润滑剂浓度为1.2%和2.5%时增加，但在润滑剂浓度为5.3%时显著降低。随着润滑剂浓度的增加，蒸发压降稳步增加，在润滑剂浓度为5.3%时，压降增加约50%至100%。一般来说，两种制冷剂的冷凝传热系数都随着润滑剂的添加而降低。HFC134a的冷凝压降在5℃时增加了约40%。 3%的润滑剂，但CFC12没有显著增加。关键词:蒸发、冷凝、传热系数、制冷剂、混合物、润滑剂、R134a、R12、压降、试验引文:ASHRAE学报，第97卷，第页。1991年，印第安纳波利斯

In-tube heat transfer coefficients and pressure drops were experimentally determined for evaporation and condensation of HFC134a and CFC12. These measurements were performed for refrigerant-lubricant mixtures ranging from 0% to 5.4% lubricant concentrations. For HFC134a, the lubricant was a 165 SUS polyalkylene glycol (PAG), while for CFC12, the lubricant was 150 SUS naphthenic oil. Evaporation tests were performed at 5 deg C (41 deg F) and condensation tests at 40 deg C (104 deg F) over a mass flux range of 130 kg/m2.s (95,860 lb/ft2.h) to 400 kg/m2.s (294,000 lb/ft2.h). The tests were conducted in a 3.67m (12 ft) long smooth tube with an inside diameter of 8.0mm (0.31 in.). The evaporation heat transfer coefficients for HFC134a and CFC12 were increased at lubricant concentrations of 1.2% and 2.5% but were significantly decreased at lubricant concentrations of 5.3%. The evaporation pressure drops steadily increased as the lubricant concentrations were increased, with about a 50% to 100% increase in pressure drop at a 5.3% lubricant concentration. Generally, condensation heat transfer coefficients for both refrigerants were decreased with the addition of lubricant. The condensation pressure drops were increased for HFC134a by about 40% at 5.3% lubricant, but CFC12 showed no significant increases.KEYWORDS: evaporation, condensation, heat transfer coefficient, refrigerants, mixtures, lubricants, R134a, R12, pressure drop, testing