R134a, one of the most commonly used refrigerants especially for air conditioning (AC) systems, will be banned in automotive air conditioners after 2022 due to a high global warming potential (GWP). R152a and R1234yf are considered as two potential low GWP drop-in alternatives to R134a due to similar thermodynamic properties. In this paper, the performance of R152a, R1234yf, and R134a in an oil-free vapour compression refrigeration (VCR) system is investigated. The absence of oil lubricant enables a wide range of refrigerant selection and highly efficient refrigeration cycle. Experiments for R152a, R1234yf, and R134a were conducted over wide range of operating conditions. The results show that R1234yf is similar to R134a in terms of operating pressure and temperature, but R1234yf has an 11% and 16% deterioration in cooling capacity and coefficient of performance (COP) respectively. The higher volumetric efficiency, adiabatic efficiency and cooling capacity of R152a contributes to a 13% and a 6% higher cooling capacity and COP respectively than that of R134a. At an evaporator temperature of 0 °C, the COP of R152a, R1234yf, and R134a are 2.8, 1.8, and 2.3, respectively. Though flammability restricts the use of R152a in conventional automotive air conditioners, R152a can be considered as a more promising alternative to R134a for oil-free automotive air conditioning than R1234yf due to its high efficiency, low cost, and reasonable safety level benefiting from the absence of oil lubricants.

R134a是最常用的制冷剂之一，尤其是用于空调（AC）系统的制冷剂，由于具有较高的全球变暖潜势（GWP），将在2022年后禁止在汽车空调中使用R134a。由于相似的热力学性质，R152a和R1234yf被认为是R134a的两个潜在的低GWP替代方案。本文研究了R152a，R1234yf和R134a在无油蒸气压缩制冷（VCR）系统中的性能。无需使用润滑油，可以广泛地选择制冷剂并实现高效的制冷循环。R152a，R1234yf和R134a的实验是在较宽的操作条件范围内进行的。结果表明，R1234yf在工作压力和温度方面类似于R134a，但是R1234yf的制冷量和性能系数（COP）分别降低了11％和16％。R152a的更高的容积效率，绝热效率和冷却能力分别比R134a高13％和6％。在0°C的蒸发器温度下，R152a，R1234yf和R134a的COP分别为2.8、1.8和2.3。尽管可燃性限制了R152a在常规汽车空调中的使用，但由于R152a具有效率高，成本低以及得益于无烟技术的合理安全性，因此它被认为比R1234yf更适合用于无油汽车空调的R134a。油润滑剂。R152a的绝热效率和冷却能力分别比R134a高13％和6％。在0°C的蒸发器温度下，R152a，R1234yf和R134a的COP分别为2.8、1.8和2.3。尽管可燃性限制了R152a在常规汽车空调中的使用，但由于R152a具有效率高，成本低以及得益于无烟技术的合理安全性，因此它被认为比R1234yf更适合用于无油汽车空调的R134a。油润滑剂。R152a的绝热效率和冷却能力分别比R134a高13％和6％。在0°C的蒸发器温度下，R152a，R1234yf和R134a的COP分别为2.8、1.8和2.3。尽管可燃性限制了R152a在常规汽车空调中的使用，但由于R152a具有效率高，成本低以及得益于无烟技术的合理安全性，因此它被认为比R1234yf更适合用于无油汽车空调的R134a。油润滑剂。