A PERFORMANCE IMPROVING OF A TYPICAL TRANSCRITICAL CO2 REFRIGERATION CYCLE

Together with the care for our environment, the natural refrigerant CO2 is seen as an attractive solution due to its excellent advantages in refrigeration application. In some cases transcritical vapor compression cycles are used instead of the conventional vapor compression cycles (air conditioning). Transcritical CO2 refrigeration cycles present low efficiencies because of losses encountered during expansion processes. In this paper, an ejector expansion transcritical CO2 refrigeration cycle is used to improve the performance of a typical transcritical CO2 cycle since a constant pressure mixing zone ejector is used instead of the expansion device from the basic transcritical CO2 refrigeration cycle.