An Experimental Study of the Transcritical CO_2 Refrigeration System Using an Internal Heat Exchanger

To improve the efficiency of the transcritical CO2 refrigeration system,a transcritical CO2 refrigeration system was set up,and an evaluation was made by contrasting the performances of the plant working with and without the IHX at the same operating conditions.The results of the research show that under a certain evaporating temperature,and when the outlet temperature of the cooling water is 55℃,the COP of the system arises at first and then decreases with the high side temperature increasing,so a maximum COP exists.The IHX can improve the efficiency of the system,and the COP of the cycle with IHX is higher than that of the cycle without IHX,the difference is about 6%~10.5%.