N_2O跨临界喷射/压缩制冷循环的理论研究  

Theoretical Analysis of N_2O Transcritical Compression/Ejection Refrigeration Cycle

作　　者：钱文波[1] 晏刚[1] 冯永斌[1] 张敏[1] 陶锴[1] 

机构地区：[1]西安交通大学能源与动力工程学院,西安710049

出　　处：《西安交通大学学报》2010年第1期66-70,共5页Journal of Xi'an Jiaotong University

基　　金：国家科技支撑计划资助项目(2009BAA17B00);长江学者和创新团队发展计划资助项目(IRJ0746)

摘　　要：为了解决CO2跨临界循环能效低、排气压力高的问题,将天然工质N2O用于跨临界循环,建立了相应的理论模型,比较了N2O和CO2用于跨临界喷射/压缩制冷循环和简单跨临界循环的性能,并对N2O用于跨临界循环中的热稳定性进行了分析.研究结果表明:N2O系统的性能系数和排气压力均优于CO2,性能系数较CO2系统分别增加了13%和9%,而排气压力分别降低了16%和13%;CO2系统采用喷射/压缩跨临界循环后性能系数比简单跨临界循环提高了15.2%,稍高于N2O系统的11.6%,说明使用喷射器对于CO2系统性能提升更为有利.分析了高压侧排气压力、蒸发温度和气体冷却器出口温度对于CO2和N2O跨临界喷射/压缩制冷循环的影响.结果表明:工况变化时N2O和CO2系统性能的变化规律一致,且气体冷却器出口温度越低、蒸发温度越高时,N2O系统的性能系数增加越明显;制冷系统中N2O的热稳定性能很好,不会分解.A theoretical model of the transcritical refrigeration cycle with natural refrigerant N2O was established,and the performance of the transcritical compression/ejection cycle and the simple transcritical cycle with N2O was compared with that with CO2.The results show that the coefficient of performance CCOP of the N2O system increases by 13% for the transcritical compression/ejection cycle and by 9% for the simple transcritical cycle compared with that of the CO2 system.However,the discharge pressure decreases by 16% and 13%,respectively.Moreover,the CCOP of the CO2 system increases by 15.2% when adding an ejector while the CCOP of the N2O system increases by 11.6%,compared with that of the simple transcritical cycle.The influence of the high side discharge pressure,evaporation temperature and gas cooler outlet temperature on the performance of the transcritical compression/ejection cycle with N2O or CO2 was also analyzed.The results indicate that the variation trends of the CO2 system and the N2O system are similar,and the CCOP of the N2O system increases more obviously than that of the CO2 system when the gas cooler outlet temperature is lower or the evaporation temperature is higher.The analysis on the thermal stability of N2O shows that N2O has good thermal stability and will not be decomposed in the transcritical refrigeration cycle.

关 键 词：CO2 N2O 跨临界循环 喷射器 性能 热稳定性 

分 类 号：TB61[一般工业技术—制冷工程]