Energy and exergy analysis of a renewable energy-driven ejector-compressor cycle with optimal refrigerant selection

The growing demand for sustainable cooling technologies has intensified the need to develop energy-efficient refrigeration systems that minimize environmental impact. This study investigates the thermodynamic performance of a renewable energy-driven ejector-compressor refrigeration cycle, with an emphasis on energy and exergy analyses and optimal refrigerant selection. A comprehensive parametric study is conducted using a numerical model to evaluate the cycle?s behavior under varying operating conditions, particularly focusing on vapor generator temperatures (75 ?C- 120 ?C) and evaporator temperatures (-15?C to 12?C). Four refrigerants are considered three wet fluids (R134a, R152a, and R290) and one dry fluid (R600) to determine the most effective and eco-friendly working fluid. Results indicate that operating temperature significantly influences the ejector?s entrainment ratio and the system?s coefficient of performance (COP). Among the refrigerants analyzed, R290 demonstrates superior thermodynamic properties, achieving a COP approximately 23% higher than its counterparts at a vapor generator temperature of 95?C. These findings underscore the potential of R290 in improving the efficiency and economic viability of ejector-based refrigeration systems, offering valuable insights for the design and implementation of sustainable cooling technologies. The novelty of this work lies in its integrated energy-exergy assessment of a hybrid refrigeration cycle combined with refrigerant optimization, providing a robust framework for advancing low-carbon cooling systems.