چكيده به لاتين
In this research, a novel combined ejector refrigeration cycle is proposed and assessed. This cycle is consisted of a vapor-vapor ejector refrigeration cycle with thermal input energy and a liquid-vapor ejector expansion refrigeration cycle with electric input energy. Energy, exergy, economic and environmental analysis is carried out. Five design parameters are selected which are temperatures of generator, condenser, intercooler, evaporator and intercooler temperature difference. The effects of these parameters on the performance of the proposed cycle is assessed by the parametric analysis. To determine the optimal value of design parameters, a multi-objective optimization is implemented by considering exergy efficiency and total annual cost as objective functions. Refrigerants, R600, R601a and R1233zd(E) are considered for vapor-vapor ejector refrigeration cycle and R152a, R290, R1234yf and R1234ze(E) for liquid-vapor ejector expansion refrigeration cycle. The proposed cycle with 12 combination of these refrigerants were optimized, and by comparison of the Pareto front curves, the R600a and R152a were selected as the final refrigerants. Furthermore, with the help of sensitivity analysis, the effect of purchase cost of electricity and components were investigated on the optimal design parameters. The results indicated that the proposed cycle has a COP of 5.14 which is 25% more compared to the ejector-compression refrigeration cycle.
