Performance Evaluation of a Dual Evaporator Ejector Refrigeration Cycle Using Gouy-Stodola Equation

This study examines the performance of a dual evaporator ejector system and contrasts it with a traditional dual evaporator cycle employing a pressure-reducing valve. The cycles have been compared for the same cooling capacity in low-temperature evaporators and unit flow rates of R152a, R134a, and R1234yf refrigerants. The system was validated, and results were numerically simulated using Engineering Equation Solver (EES). The effects of varying the evaporator and condenser temperature have been analyzed in the present study. It is found that compressor work decreases in the ejector-assisted cycle; thus, the total exergy increases in the exergy analysis while increasing the condenser temperature. The study found that the ejector-assisted dual evaporator cycle had a 14.6–18.78% reduction in total exergy destruction when compared to the conventional dual evaporator cycle with a pressure-reducing valve. The R134a of an ejector cycle provides 13.57–15.65% COP improvement and 12.46–14.69% exergy efficiency improvement respectively over the conventional cycle. The COP is found to be maximum for MDEEC using R152a as refrigerant.