R1234yf and R744 as alternatives to R134a at mobile air conditioners

R1234yf is a synthetic HFO refrigerant co-developed as replacement for R134a in automotive air conditioning applications. Thus, this study, alternatives to the that were removed from newly produced devices examined. The performance of cooling processes and R744 gases was compared with R134a. A simulation model first developed. This validated experimental results. Analysis conducted both heating modes. In case cooling, evaporation temperature 5 °C–7.5 °C, condenser, or gas cooler outlet 35 °C–50 °C load 10 kW. mode, −4 °C–12 45 13.5 results analyzed terms coefficient (COP), compressor power consumption, discharge temperature. COP gave best all cases. closest temperature, which affects lifetime lubrication quality compressor, lowest temperatures