Performance Evaluation of Ejector Refrigeration Cycle (ERC) Using Multi-parallel Ejectors

In this paper, by using of multi-parallel ejector and low-temperature heat sources in the Ejector Refrigeration Cycle (ERC), the first and second laws of thermodynamics have been conducted in order to keep the system running at optimum conditions due to the variation of working conditions. The irreversibility of the components and whole cycle have been conducted leading to determination of the main source of the exergy losses in the whole system. It is shown that the ejector with lower pressure than the condenser pressure accounts for higher source of irreversibility. Later, seven working fluids (i.e., R152a, R134a, R290, butene, isobutene, isobutane, and R236fa) are presented for the cycle. In this case, the maximum and minimum coefficient of performances (COPs) are calculated 0.344 for R152a and 0.285 for R236fa, respectively, while the maximum and minimum exergy efficiencies are calculated 33.98% for R152a and 27.63% for isobutene, respectively. .