THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

H. F. Elattar

,

A. Fouda

,

Ahmed Al-Zahrani

,

Rayed S. Alshareef

,

Bandar Awadh Almohammadi

online first only

Improving automotive air conditioning systems' (AACs) thermodynamic performance with eco-friendly azeotropic refrigerant blends

ABSTRACT
Automotive air-conditioning systems (AACs) traditionally use high-GWP refrigerants, raising environmental concerns. To address this, new azeotropic refrigerant blends-R513A, R513B, R515A, R515B, and R516A-have been developed. These blends offer environmentally friendly alternatives with promising thermodynamic performance. R513A and R513B are suitable replacements for R1234yf and R134a with minimal system modifications, while R516A provides the highest cooling capacity (16.54 kW) and maximum optimal COP (39.84), making it highly effective. R515A ensures low GWP and compressor temperatures, whereas R513A and R513B optimize energy efficiency and safety. Notably, R513A and R513B exhibit the lowest compression ratio (γ) and highest COP values (5.79, 7.23, and 9.40) across various evaporator temperatures, making them ideal for energy-saving applications. Overall, azeotropic refrigerants outperform R1234yf in COP, cooling capacity, and safety, while offering environmentally sustainable solutions for AACs.
KEYWORDS
GWP, AACs, environmentally friendly, Azeotropic refrigerants
PAPER SUBMITTED: 2025-04-11
PAPER REVISED: 2025-05-20
PAPER ACCEPTED: 2025-05-26
PUBLISHED ONLINE: 2025-07-05
DOI REFERENCE: https://doi.org/10.2298/TSCI250411124E
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Improving automotive air conditioning systems' (AACs) thermodynamic performance with eco-friendly azeotropic refrigerant blends