Performance analysis of ejector refrigeration cycle with zeotropic mixtures
Authors: Mohammed Mehemmai, Hichem Grine, Hakim Madani, Cherif Bougriou
Volume 10, Issue 4, Paper No. 100404
Abstract
In this article, we present an energetic and thermodynamic study of a refrigeration cycle with ejector (RCE), through a zeotropic binary fluid. In this context, four binary mixtures based on R1234yf were chosen given their minimum GWP values. The objective is to determine their values of coefficients of performance (COP) by changing each time the composition of the fluid mixture studied. The results obtained for the COP and the entrainment ratio were determined for different temperatures condensation (Tc), temperatures evaporation (Te) and different mass fractions (Mf). The study showed that the coefficient of performance (COP) values decreases with increasing condensation temperature (Tc), as the evaporation temperature (Te) increases the COP increases. The maximum coefficient of performance (COP) values are: 10.02 for the R1234yf +R152a system, 9.83 for the R1234yf + R134a system, 9.67 for the R1234yf + R32 system, 9.59 for the R1234yf + R125 system of 9.59 whose mass percentage of R1234yf is: 0.75, 0.45, 0.05 and 0.05 respectively. A particle study on the effect of glide temperature (Tg) was inserted for the selected binary systems either. The results showed that the temperature glide is inversely related to the COP at the evaporator and condenser levels and in all four mixtures. So, a decrease in temperature glide (Tg) leads to better performance.
Keywords: Zeotropic mixtures; Refrigeration; Ejector cycle; COP, R1234yf; GWP.
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