Experimental investigation on refrigeration performance of a CO2 system with intermediate cooling for automobiles

This study conducted an experimental investigation on a CO2 transcritical refrigeration system with dual rotor and intermediate cooling compressor (ICC) for automobiles. Based on the typical operating conditions, the performance of the system with ICC was analyzed by comparison with the basic cycle. The results show that the performance of the system with ICC is roughly equivalent to that of the basic cycle under the condition of 35 degrees C ambient temperature, while it has outstanding superiority under the condition of 45 degrees C, with 19.8% increment in the maximum cooling capacity and 12.8% increment in the maximum COP, respectively. The effect of the system's dynamic components on the immediate cooing is analyzed. According to the analysis of experimental data, it is figured out that the trend of the cooling capacity is consistent with the change trend of the inlet temperature of electronic expansion valve (EEV) and there exists an inflection point with adjustment of EEV.