电动车废热辅助空调系统的研究

Study on Air Conditioning System Assisted by Waste Heat for Electric Vehicles

针对目前电动车空调存在的节能性和低温适应性等问题,提出了一种电动车废热辅助热泵空调系统。该系统将多变频器协调控制技术、双级压缩循环技术、废热辅助热泵技术有机融合,通过仿真分析研究系统在不同运行状态下的系统性能。仿真结果表明:协调调节低压级压缩机和风扇电机的频率,可实现系统制冷/制热量和能效比的优化控制;合理设置单双级压缩的温度切换点,能提升制热性能、保证系统在低温工况下的可靠运行;利用废热辅助空气源热泵技术,能实现系统的节能。研究结果为减小空调系统对电动车续航里程的影响、推动电动车的普及提供了参考。

In view of energy saving and adaptability of existing air conditionings,a novel heat pump air conditioning system assisted by waste heat for electric vehicles is proposed.This system is integrated inverter technology,two-stage compression cycle technology as well as heat pump technology assisted by waste heat.The system performance is studied by the simulation analysis under different operating states.The simulation results show that the cooling/heating capacity and the energy efficiency ratio can be optimized by adjusting the compressor frequency and fans frequency coordinately.Also,the heating performance can be improved as well as the system can run reliably under low outdoor temperature by setting the switching point of two-stage compression cycle reasonably.Furthermore,the waste heat assistant heat pump can achieve energy saving of this system.The research results provide a reference for reducing the influence of air conditioning system on the range of electric vehicles and promoting the popularity of electric vehicles.