Injector

Coefficient of performance

Heat pump and refrigeration cycle

Vapor-compression refrigeration

Gas compressor

Engineering

Materials science

Exergy efficiency

Cooling capacity

Computer science

Heat exchanger

Mechanical engineering

Thermodynamics

Physics

Nuclear engineering

Process engineering

Environmental science

Refrigeration

Refrigerant

Exergy

International Journal of Refrigeration

To increase the coefficient of performance of a simple vapor-vapor ejector refrigeration cycle, this cycle is combined with a simple liquid-vapor ejector refrigeration cycle. The new combined ejector refrigeration cycle is modeled in energy, exergy, environmental and economic aspects. Then two-objective optimization of this cycle (with exergy efficiency and total annual cost as two objective functions) is performed and optimum values of five design parameters for combined vapor–vapor and liquid-vapor ejector refrigeration cycle are obtained. Moreover, from three different refrigerants for vapor-vapor ejector cycle and four different refrigerants for liquid-vapor ejector cycle (sum of twelve different cases), two refrigerants are also selected for combined vapor–vapor and liquid-vapor ejector cycle at the optimum point. Analysis of the new proposed cycle shows 18% higher coefficient of performance, 25% higher exergy efficiency, 31% lower electricity consumption and 8% lower annual cost for a specific cooling capacity in comparison with another combined (hybrid) ejector-compressor refrigeration cycle.

Thermal and economic modeling and optimization of a novel combined ejector refrigeration cycle