Abstract
In this paper a dynamic model of transcritical CO2 ejector expansion refrigeration cycle with two-stage evaporation (EERC-TE) is established to track the transient response of system parameter at two regulation methods which includes the vapour quality adjustment and the entrainment ratio adjustment. The effectiveness of system model is verified and the results show the predictions have a agreement with the experimental data. Based on the unit change of ejector nozzle throat area and volume flow rate of chilled water of the second evaporator, the dynamic responses of pressure in gas cooler, the first and second evaporator, mass flow rate of primary flow, entrainment ratio and vapour quality of separator inlet are compared. The regulation of ejector nozzle throat area causes relatively large system responses compared to that of chilled water flow rate of the second evaporator. This work is useful to guide system control and the improvement of system performance.
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