Effect of intermediate pressure on the performance of CO2 booster refrigeration system in supermarkets
Thermodynamic models for system were developed and theoretically simulated for transcritical CO2 basic booster(BRC)and parallel compression(PRC)refrigeration systems in supermarkets.The focus was on the influence of operating pa-rameters such as intermediate pressure,ambient temperature and discharge pressure on the performance of the system.The results show that the value of the intermediate pressure has a small effect on the COP of the basic booster refrigeration system.The inter-mediate pressure for parallel compression systems has an optimal value,ranging from 5 MPa to 5.3 MPa,and can slightly reduce the optimal discharge pressure.The greater the intermediate pressure,the more significant the improvement in maximum COP and maximum exergy efficiency of PRC compared to BRC.Under the given operating conditions,the maximum COP of the parallel compression system is increased by 19.67％～24.08％compared to BRC,and the maximum exergy efficiency is increased by 26.86％～33.04％.
Transcritical CO2BoosterParallel compressionIntermediate pressureRefrigeration system
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