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 (75-120?C) and evaporator temperatures (?15-12?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 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 under?score 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.