Effects of Internal Heat Exchanger on Two-Stage Compression Trans-Critical CO2 Refrigeration Cycle Combined with Expander and Intercooling

Because of the limitations traditional refrigerants, application trans-critical CO2 technology in domestic gas conditioners and other fields is becoming increasingly popular. This paper proposes a new refrigeration system. Combining internal heat exchanger expander components, as well two-stage compression cycle, we analyzed effectiveness expander, exchanger, intercooling on system performance under various operating conditions terms energy, exergy analysis, optimal discharge pressure. The can be changed by changing cycle effectiveness, which reduces power consumption percentage losses cooler components. Compared to single-stage with systems reduced 2–15.7% maximum COP increased 2.93–6.93%. From view energy system’s increases 3.9% decreases 22.5% varying. addition an has resulted improved performance, important for providing relevant model application.