Energetic and exergetic performance comparison of an experimental automotive air conditioning system using refrigerants R1234yf and R134a

In this study, the energetic and exergetic performance merits of an automotive air condition-ing (AAC) system using R134a R1234yf have been investigated. For aim, a laboratory AAC was developed equipped with devices for mechanical measurements. The refrigeration circuit mainly had evaporator, condenser, liquid receiver, fixed capacity compressor, thermostatic expansion valve. tests were performed by changing compressor speed stream temperatures incoming condenser evaporator. Based on energy exergy analysis, various parameters both refrigerants determined presented in comparative graphics. It found that resulted 0.4–10.9% lower capacity, 5.5–11.6% COP, 4.7–16.1°C discharge temperature, while yielding 9.3–22.3% higher refrig-erant mass flow rate 1.1–3.5°C conditioned airstream temperature comparison to R134a. Moreover, components usually destructed more exergy, total destruction per unit 4.1–15.3% greater than one.