Experimental performance comparison of R1234yf and R134a automobile air conditioning systems employing a variable capacity compressor Online publication date: Mon, 27-Feb-2023
by Erkutay Tasdemirci; Ertan Alptekin; Murat Hosoz
International Journal of Vehicle Design (IJVD), Vol. 90, No. 1/2/3/4, 2022
Abstract: The use of refrigerants from the hydrofluorocarbon family has been restricted due to their high global warming potential, and the manufacturers have been using R1234yf recently, a refrigerant from the hydrofluoroolefin family, as a substitute for R134a in mobile air conditioning (MAC) systems. In this study, a laboratory MAC system with a variable-capacity compressor was set up, and its comparative energetic and exergetic performance was evaluated for the cases of using R1234yf and R134a by changing the test conditions in a wide range. The results revealed that the system with R1234yf provided on average 13.7% less cooling duty and 12.8% less coefficient of performance based on the total power input relative to the system with R134a. Furthermore, the system with R1234yf destructed on average 18.9% more exergy per unit cooling duty. Excluding the condenser, the components of the R1234yf system destructed more exergy per unit cooling duty than those of the R134a one.
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