【作者】 方健珉； 王谙词； 乔义友； 殷翔； 曹锋；

【Author】 Fang Jianmin;Wang Anci;Qiao Yiyou;Yin Xiang;Cao Feng;School of Energy and Power Engineering,Xi’an Jiaotong University;

【机构】 西安交通大学能源与动力工程学院；

【摘要】 为研究跨临界CO₂制冷循环最优排气压力的影响因素与控制方法,本文基于GT-Suite建立了一个电动车用跨临界CO₂空调模型,包括车厢和CO₂循环中各部件,并应用该模型通过响应面分析拟合最优排气压力公式,将应用该公式的关联式控制方法与极值搜索控制方法进行比较研究,在不同环境温度、室外风量、热负荷下比较两种控制方法下的系统能效,并在CLTC循环和变环境温度下对比分析了不同控制方法下的系统运行情况和性能。结果显示,系统最优排气压力与气体冷却器出口温度相关性最高,在充分数据的拟合下,使用气体冷却器出口温度和蒸发器拟合所得的关联式可以实现很好的控制效果,极值搜索控制程序也可以在动态环境中使系统保持在最优性能下运行。更多还原

【Abstract】 To study factors affecting the optimal discharge pressure in the transcritical carbon dioxide refrigeration cycle and its control methods,a simulation model of a transcritical CO₂ air conditioning system for electrical vehicles was built based on GT-Suite software,including the cabin and other components in CO₂ cycle.The model was used to fit the optimal discharge pressure formulas by response surface analysis.The correlation control method using these formulas was compared with the extreme seeking control in the system performance at different ambient temperatures,outdoor air flowrate and thermal load.The system operating condition and performance was also analyzed at dynamic conditions of the CLTC cycle and changing ambient temperature.Results showed the optimal discharge pressure had the highest correlation with the gas cooler exit temperature.With sufficient data,the formula obtained by fitting gas cooler exit temperature and evaporator temperature could achieve an excellent control effect,while the extreme seeking control can also ensure the system’s optimal operation in dynamic environment.更多还原