电动汽车 CO2热泵空调制热性能分析

为提升电动汽车CO2热泵空调的系统性能及扩宽热泵空调的使用温区，构建了回热器+补气增焓的跨临界CO2系统，通过建立数值模型对该系统的制热性能进行了仿真分析。研究结果表明，气体冷却器压力对制冷系数 （Coefficient of Performance，COP） 影响较大，且存在最优气体冷却器压力和中间补气压力使COP达到最大值；中间补气过程能有效提升COP和制热量，且能有效降低压缩机排气温度；回热器过热度对COP和制热量影响较小，但会导致压缩机排气温度上升。

Thermal Performance Analysis of CO2 Heat Pump Air Conditioning System in Electric Vehicles

To improve the performance of CO2 heat pump air-conditioning systems in electric vehicles and extend the operational temperature range, this paper constructs a trans-critical CO2 system with a regenerator and vapor injection. The system heating performance is simulated and analyzed by using a numerical model. The results show that the gas cooler pressure has a great influence on the COP. There is an optimal combination of the gas cooler pressure and the intermediate supply pressure to make the COP reach the maximum value. Additionally, the intermediate air supply process effectively enhances both the COP and heat production, while effectively reducing the compressor exhaust temperature. The superheat of the regenerator has little effect on the COP and heat production; however, it leads to an increase in the compressor exhaust temperature.