Results of analysis of thermodynamic cycle efficiency with consideration of nonisothermal nature of phase transition indicate that when using the mixture of R32/R152a (30/70%) in the vapor compression heat pumps, the coefficient of performance is up to 4% higher in comparison with R32/R134a (30/70%). The study shows that in cycles with two-stage compression the coefficient of performance increases by 6.5% as compared to the single-stage process. The value of exergic efficiency of the single-stage cycle is equal to 0.47 for zeotropic mixture of R32/R152a (30/70%), and it is equal to 0.45 for the R32/R134a (30/70%) mixture. Data obtained for the zeotropic mixtures are as effective as those obtained for refrigerant R134a.
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Mezentseva, N.N., Mezentsev, I.V. Investigation of Heat Pump Efficiency on Zeotropic Refrigerants R32/R134a and R32/R152a. J. Engin. Thermophys. 27, 554–559 (2018). https://doi.org/10.1134/S1810232818040185