A Comparative Performance Study of an Ejector-Expansion Refrigeration Cycle Using R134a and its Alternatives: Application of Automobile Air Conditioning

• Published in: International journal of air-conditioning and refrigeration Vol. 29; no. 4; pp. 1 - 15
• Main Authors: Al-Chlaihawi, Kadhim K. Idan, Kadhim, Hakim T., Yousif, Ahmad Hashim
• Format: Journal Article
• Language: English
• Published: World Scientific Publishing Company 01.12.2021; 대한설비공학회
• Subjects: 기계공학; alternative refrigerants; GWP; EERC; Automobile air conditioning; performance improvement
• ISSN: 2010-1325; 2010-1333
• DOI: 10.1142/S2010132521500358

In this study, the performance of ejector-expansion refrigeration cycle (EERC) with R134a alternative refrigerants (R152a, R1234yf, R404A, R407C, R507A and R600a) for automobile air-conditioning application is investigated numerically. The ejector is modeled with a constant mixing-pressure assumption taking into consideration the friction effect in the ejector mixing section. The studied refrigerants are compared based on the optimum area ratio, discharge temperature, compressor input power, volumetric cooling capacity, exergy destruction, COP, exergy efficiency and COP improvement. The results show that R152a and R1234yf have the closest performance to R134a and can be considered the most suitable alternative refrigerants for R134a. The COP and exergy efficiency are improved by 2.26% and 2.27%, respectively, using R152a compared to the use of R134a, whereas they are reduced by 2.89% and 2.88% using R1234yf. The volumetric cooling capacity is reduced for both R152a and R1234yf by 6.14% and 6.8%, respectively. In addition, the effect of compressor rotational speed on the performances is reported.