Role of receiver on the performance of a transcritical CO₂ based air-conditioning unit with single-stage and two-stage expansion

Theoretical and experimental studies are carried out on a transcritical CO2 based air-conditioning unit. Two configurations– system with single-stage expansion (SSE) two-stage (TSE) have been considered. Detailed numerical models developed for both configurations. Results obtained from simulations compared results. The performance of the is under different conditions refrigerant charge, receiver volume, ambient temperature. Both results show that SSE configuration highly sensitive to charge as TSE configuration. offers better controllability provided sized properly. Besides, it found same performance, required can be reduced by about 15%