Thermodynamic and exergy performance assessment of ejector-expansion refrigeration cycles with alternative refrigerants

Résumé fourni par la source

The significant throttling losses experienced by conventional vapor compression refrigeration systems (VCRS) lower their energy efficiency and exacerbate environmental problems including ozone layer depletion. In order to improve energy and exergy efficiency, this study examines ejector-expansion refrigeration cycles (EERC) as a substitute, concentrating on the relative performance of various ejector topologies and refrigerants. To assess the thermodynamic and exergetic behavior of EERCs in comparison to conventional VCRS, constant-pressure mixing (CPM) and constant-area mixing (CAM) ejector models are utilized. It also looks at how different refrigerants affect system efficiency. The first and second laws of thermodynamics were applied. Both CPM and CAM models are used to create ejector simulations, and their performance is evaluated using exergy efficiency and coefficient of performance (COP). Multiple refrigerants and environmentally sustainable are used to test the systems. According to the results, the COP of the EERC-CAM configuration was 8% higher than that of the EERC-CPM. EERC-CAM's exergy efficiency increased by 10% over EERC-CPM and by 22% over VCRS. With a 10.5% better exergy efficiency than R-134a, R-152a outperformed the other refrigerants under investigation, while R-227ea performed the worst. All things considered, the results show that EERC-CAM in conjunction with ideal refrigerants is a feasible path towards more energy-efficient cooling systems.

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