An automotive air conditioning and heat pump (AAC/AHP) system employing refrigerants R134a and R1234yf was developed and tested in cooling and heating operation modes under broad ranges of compressor speed and air inlet temperature conditions. Using test results, various energetic and exergetic performance parameters of the system were evaluated and compared. The R1234yf system provided on average 5.8% lower cooling capacity, 0.2% higher heating capacity, 11.9% lower COP for cooling and 3.6% lower COP for heating relative to the R134a one. Furthermore, the exergetic efficiency of the R1234yf system were on average 17.6% and 14.7% lower compared to the R134a one in cooling and heating modes, respectively. The major contributor to the exergy destruction in the system is the compressor for both refrigerants and operation modes. These results reveal that R1234yf performs better in heating relative to cooling mode, and it can be used as a replacement for R134a in not only AAC but also AHP systems in expense of slightly lower energy effectiveness.

开发了一种使用制冷剂R134a和R1234yf的汽车空调和热泵（AAC / AHP）系统，并在广泛的压缩机转速和进气温度条件下以制冷和制热运行模式进行了测试。使用测试结果，评估并比较了系统的各种能量和能量性能参数。与R134a相比，R1234yf系统的冷却能力平均降低了5.8％，加热能力提高了0.2％，冷却的COP降低了11.9％，加热的COP降低了3.6％。此外，在制冷和加热模式下，R1234yf系统的能效比R134a分别低17.6％和14.7％。造成系统火用破坏的主要原因是制冷剂和运行模式的压缩机。