摘要
试验研究了CO2充注量对跨临界轿车空调系统性能的影响.研究表明:CO2充注量对跨临界制冷系统的性能影响很大,存在一个最佳的CO2充注量,此时COP最大;CO2充注量不足,会导致制冷量和COP降低,CO2充注量过多,会导致压缩机耗功大幅度上升;制冷循环随CO2充注量的不同,具有6个特征明显的工作循环.根据这些表现特征,提出了用4个参数作为判断CO2充注量是否合适的特征参数.为确定跨临界制冷系统的最佳充注量、对系统进行优化设计和高效运行控制提供了参考.
In this paper, an experiment was carried out to evaluate the impact of CO2 mass charge on a CO2 automotive air conditioner. The CO2 air conditioner was designed to have heat exchanger dimensions nearly identical to conventional R134a systems. The heat exchanger was made of fin-tubes, the compressor was of swash plate design, and a manual expansion valve and an internal heat exchanger accumulator were used. The experimental results show that the coefficent of performance （COP） was strongly related to CO2 mass charge and the formation of the trans-critical cycle depended on CO2 mass charge greatly. The COP has a maximum value at a specific CO2 mass charge. Undercharged CO2 systems could result in a fast decrease of the cooling capacity and COP; however, overcharged CO2 systems could cause an abrupt increase of compressor power consumption. The refrigerating cycle displayed different characteristics with different CO2 mass charges. The optimum CO2 mass charge could be determined according to four state parameters.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2005年第8期1426-1432,共7页
CIESC Journal
基金
国家自然科学基金项目(50060007)
高校博士点基金项目(20030248033)
上海市青年科技启明星项目(03QF14030)~~
关键词
CO2
轿车空调
跨临界循环
充注量
CO2
automotive air conditioning
transcritical cycle
refrigerant mass charge
