Investigating the effect of ejector design parameters on performance of a PV/T cogeneration system based on thermodynamic and thermoeconomic concepts

This research proposes a new power and cooling system driven by solar energy. 150 polycrystalline cells are used for producing the nominal capacity of 20 kW electricity. Each module produces 130 W electricity in normal incident radiation. The cooling system is equipped by two series ejectors integrated with photovoltaic modules. The portion of required heat for cooling system is provided by the warm photovoltaic modules and auxiliary heater simultaneously. Two organic working fluids namely R600a and R152a are applied in vapor compression refrigeration subsystem. The desired system is modeled by using the Tehran metrological condition. The major design parameters of ejector 1 and 2, namely the pressure drops and area ratios, are selected to assess the performance of the system from the thermodynamic and thermoeconomic viewpoints. Outcomes indicate that R600a has a higher thermal efficiency in comparison with R152a while using R152a leads to the higher exergy efficiency and lower total product cost rate of system. Moreover, Parametrical assessment of system indicates that the increment of area ratio and pressure drop in both ejector increase the energy and exergy efficiencies. Moreover, the area ratio and pressure drop of ejector 1 have a positive effect on total product cost rate of system.