制冷学报2024，Vol.45Issue(4)：59-67,9.DOI:10.3969/j.issn.0253-4339.2024.04.059
电动车跨临界CO2热系统充注定量需求规律及非适充系统失稳特性
Charging Requirements and Unstable Characteristics of Automotive CO2 Thermal Management Systems
摘要
Abstract
Transcritical CO2 thermal systems have emerged as leading solutions to addressing challenges such as"range anxiety in winter"and pronounced greenhouse effects associated with the working fluid in electric vehicle thermal systems.Nevertheless,the intricate interplay of transcritical cycles in the varied scenarios of electric vehicles introduces complexity,with performance and operational stability intricately linked to the refrigerant charge.This study conducts simulations to investigate the variability in refrigerant charging requirements for transcritical CO2 thermal management systems under diverse operating conditions.We specifically examined the impact of three critical factors,namely ambient temperature,indoor airflow rate,and outdoor air velocity,on refrigerant requirements in different modes and their underlying mechanisms.In the heat pump mode,the demand for refrigerant charge increases with ambient temperatures and wind speed and decreases with cabinet air flow rate,with changes of 18.6％,18.9％,and 6.16％,respectively.In the cooling mode,the refrigerant charge requirement decreases with ambient temperatures and cabinet air flow rate and increases with outdoor wind speeds,with changes of 7.03％,7.85％,and 2.27％,respectively.In situations of nonoptimal charging,potential alterations in the interaction between system control variables and target variables contribute to system instability.This necessitates adjustments to refrigerant distribution to mitigate instability under specific operating conditions.The research outcomes hold substantial reference value for the optimization of electric vehicle air-conditioning accumulator designs,enhancement of energy efficiency,and improvement of overall thermal comfort.关键词
电动汽车/CO2热管理系统/充注量需求/系统失稳Key words
electric vehicle/CO2 thermal management system/refrigerant charge demand/system instability引用本文复制引用
王从飞,贾凡,殷翔,曹锋..电动车跨临界CO2热系统充注定量需求规律及非适充系统失稳特性[J].制冷学报,2024,45(4):59-67,9.基金项目
国家自然科学基金(52006162)资助项目.(The project was supported by the National Natural Science Foundation of China(No.52006162).) （52006162）
