Abstract
In this study, a hybrid supercritical power and refrigeration cycle is proposed, and its thermodynamic performance is analysed. The topping cycle operates as a supercritical CO2 (scCO2) power cycle, while the bottoming cycle is an ejector-assisted compression refrigeration cycle utilizing waste heat. Five refrigerants (R1234ze, R600a, R744, R410a, R32) are tested in the bottoming cycle. First and second law analyses are conducted under varying turbine inlet temperature (TIT), compressor inlet temperature (CIT), flow split ratio (FSR) and presure ratio (PR). Maximum first and second law efficiencies are 0.33 and 0.29, respectively. Single-objective optimization shows optimal conditions at TIT = 301.5°C, CIT = 32°C, FSR = 0.4 and PR = 2.9, yielding 0.33 thermal efficiency. In addition, Total Equivalent Warming Impact analysis was conducted to evaluate the environmental impact of the investigated refrigerants over the system’s operational lifetime.
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