对R-134a进行了性能对比试验，该制冷剂被视为替代R-12的制冷剂。这两种制冷剂在为R-12设计的小型原型排气空气热泵（EAHP）中进行了测试。对于R-134a试验，使用了一种特殊的压缩机润滑油。根据测试数据，在提供给EAHR的相同空气温度范围内测试了两种制冷剂，绘制了图表，以比较作为室外空气温度函数的机组性能。本文对制冷剂蒸发、冷凝温度和压力、加热能力、压缩机功率要求、性能系数（COPs）等进行了比较。还描述了恒温膨胀阀的性能，包括在R-134a试验中提供满意控制所需的内部节流孔变化。引文:ASHRAE Transactions，第95卷，pt。1989年，温哥华

Performance comparison tests were carried out on R-134a, which is being considered as a substitute refrigerant to replace R-12. The two refrigerants were tested in a smallprototype exhaust airheatpump (EAHP) designed for R-12. For the R-134a tests, a special compressor lubricating oil was used.t~oth refrigerants were tested over the same range of air temperatures supplied to the EAHR From the test data, graphs were plotted to compare performance of the unit as a function of outdoor air temperature. In this paper, comparisons are presented of refrigerant evaporating~ condensing temperatures and pressures, heating capacities, compressor powerequirements, coefficients of performance (COPs), etc. Thermostatic expansion valve behavior is also described, including the internal orifice changes that were necessary to provide satisfactory control in the R-134a tests.