带余热回收的CO_(2)车用热泵系统实验研究

Experimental Research on the Heating Performance of Waste Heat Recovery CO_(2)Heat Pumps for Electric Vehicles Yuan Haorui Song Xia Yu Binbin

本文研制了一套具有串联式余热回收功能的CO_(2)热泵系统,并在标准焓差台中实验研究了不同工况参数对系统低温制热性能的影响。结果表明:双热源余热回收系统(空气热源和电机热源)的性能优于单空气热源系统,双热源模式可以优化系统参数,提高系统制热量与COP,扩大热泵系统低温工作范围。在环境温度为-20℃时系统切换至双热源模式后的制热量及COP分别提高18.9%和5.9%。低温环境下使用双热源模式优势显著,随着室外温度由-5℃降至-20℃,开启双热源模式后制热量的增加率由4.3%增至18.9%,COP的增加率由4.3%增至5.9%。提出低于-5℃的环境温度是使用余热模式的最佳温度范围,为CO_(2)车用热泵系统的实际应用提供指导。

A set of waste heat recovery series-type CO_(2)heat pump systems is designed for electric vehicles,and the effects of different operating parameters on the low-temperature heating performance of the system are experimentally studied by using a standard enthalpy difference test facility.The results show that the performance of the dual heat source system is better than that of the single source system.The dual heat source mode can optimize the system parameters,increase the heating capacity of the system,and expand the low-temperature working range of the heat pump system.When the ambient temperature is-20℃,the heating capacity and COP of the waste heat recovery mode are increased by 18.9%and 5.9%,respectively.The performance characteristics of the system are analyzed by changing the temperature conditions.The dual heat source mode exhibits more significant advantages in low-temperature environments;as the ambient temperature decreases from-5℃to-20℃,the increase ratio of the heating capacity improves from 4.3%to 18.9%,and the increase ratio of COP improves from 4.3%to 5.9%.Thus,it is the best temperature range for using the waste heat mode when the ambient temperature is lower than-5℃.These results guide the practical applications of CO_(2)vehicle heat-pump systems.