Optimization and cooling performance analysis of CO2 heat pump air conditioning system for electric vehicle
In order to improve the efficiency of CO2 cycle system for electric vehicle,a trans-critical CO2 system with regenerator and gas injection in the middle was constructed.The effects of Tgo,Pg,Pm,β,△T on EER,Qe and Tco were studied by simulation.The results show that Pgo and Pm,opt makes the EER reach the maximum value,and the relationship between the Popt and the Tgo.An increase in Tgo can degrade system performance,The performance of the system can be improved by increasing the amount of gas injection in the middle and the superheat of the regenerator,which can increase the EER by 15.64%and 6.07%,respectively,and the cooling capacity by 27.88%and 4.78%.The increase of the superheat of the regenerator will lead to the increase of the discharge temperature of the compressor,the gas injection in the middle can reduce the discharge temperature of the compressor,when the discharge temperature of the compressor is limited,the optimization ability of the regenerator to EER and cooling capacity can be increased by 203%and 173.87%.Compared with the basic trans-critical CO2 system,the optimized system can increase the EER and cooling capacity by 18.38%and 35.03%.
heat pump air conditioninggas injection in the middleregeneratortrans-critical CO2 cycle
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