Paper No 353 – 1 Performance simulation of CO2 transcritical cooling system with mechanical subcooling cycle using low GWP refrigerants – 13th IEA Heat Pump Conference, Jeju, Korea
The conventional automobile cooling systems using CO2 as a refrigerant are hard to achieve proper cooling performance at hot summer season. In order to enhance the of CO2 cooling systems, a mechanical subcooling cycle is proposed for application to vehicles with limited installation space. To analyze performance of the system, numerical models were built to predict the COP by changing the design parameters and heat exchanger arrangement. In addition, the maximum COP is determined by using an optimal method. The results show that the COP improves when applying the subcooling cycle, and the maximum COP is obtained based on the thermodynamic states at the outlets of the gas cooler and the sub-cooler.