电动汽车CO2热泵空调系统优化及制冷性能分析OA北大核心CSTPCD
Optimization and cooling performance analysis of CO2 heat pump air conditioning system for electric vehicle
为提升电动汽车CO2 热泵空调系统的制冷性能,文章构建了中间补气+回热器的跨临界CO2 系统,通过仿真研究了气体冷却器出口温度(Tgo)、气体冷却器压力(Pg)、中间补气压力(Pm)、相对补气量(β)、回热器过热度(△T)对系统制冷系数(EER)、制冷量(Qe)和压缩机排气温度(Tco)的影响及中间补气对回热器优化能力的提升.研究表明:存在最佳气体冷却器压力和最佳中间补气压力使得EER达到最大值,并得到两者与气体冷却器出口温度的关系式;气体冷却器出口温度上升会使系统性能下降,中间补气量和回热器过热度的增加能提升系统性能,EER提升了 15.64%和6.07%,制冷量提升了 27.88%和 4.78%;回热器过热度的增加会导致压缩机排气温度上升,中间补气可降低压缩机排气温度,当限定压缩机排气温度时,中间补气可使回热器对EER和制冷量的优化能力分别提升了 203%和 173.87%;相对于基础跨临界CO2 系统,文章构建的优化系统在所研究工况内可使系统EER和制冷量分别提升18.38%和 35.03%.
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%.
李江峰;李帅旗;宋文吉;冯自平
中国科学院 广州能源研究所,广东 广州 510640||中国科学院大学,北京 100049中国科学院 广州能源研究所,广东 广州 510640中国科学院 广州能源研究所,广东 广州 510640||淄博能源研究院,山东 淄博 255000
热泵空调中间补气回热器跨临界CO2循环
heat pump air conditioninggas injection in the middleregeneratortrans-critical CO2 cycle
《可再生能源》 2024 (005)
612-619 / 8
国家重点研发计划项目(2021YFE0112500).
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