Objective:A trans-critical CO2 refrigeration system with ejector is proposed and its performance factors are studied.Methods:In this paper,energy and exergic system model combined with experiment method were used to study the impact of the change of major parameters on traditional and new refrigeration systems.Results:In a given working condition,exergy efficiency of the compressor increased by 11.08％when an injector replaced the throttle valve,while the power of the compressor decreased by 6.04％and the performance factor increased by 11.1％.The optimum gas cooler pressure was found to maximize the system performance.In addition,the exergic damage of the system components was optimized in this paper.Conclusion:The ejector of the new system has great potential for optimization,and the outlet temperature of the gas cooler has the greatest influence on the performance of the ejector.
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