N_2O跨临界双级压缩带膨胀机制冷循环  

Study of N_2O transcritical two stage compression expander refrigeration cycle

作　　者：钱文波[1] 晏刚[1] 冯永斌[1] 张敏[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：《低温工程》2009年第6期1-6,共6页Cryogenics

基　　金：国家科技支撑计划(2009BAA17B00)

摘　　要：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CO2和N2O用于跨临界两级压缩膨胀制冷循环的性能。结果表明:N2O用于跨临界两级蒸气压缩膨胀制冷循环中的综合性能要优于CO2。在所选定的工况范围内,N2O系统的Ccop值(性能系数)比CO2最多提高9.6%,当气冷器出口温度越低、蒸发温度越高时,N2O系统的Ccop值增加越明显;N2O系统的最优高压压力远低于CO2,在气体冷却器出口温度为40℃时,最优高压侧排气压力最多降低了16.2%;N2O系统在排气温度、单位质量制冷量方面也较CO2具有优势。最后提出通过降低气体冷却器出口温度来提高跨临界带膨胀机制冷循环性能和降低最优高压侧排气压力的观点。The natural refrigerant N2O was supposed to be chosen for applying to the transcritical refrig- eration cycle and the performance was compared with CO2 on corresponding theoretical model. The results show that N2O plays a better comprehensive performance than CO2 in transcritical two stage compression ex- pander refrigeration cycle. The Ccop of N2O is higher than that of CO2 by 9.6% in selected conditions, which increases obviously with the decreased exit temperature of gas cooler and the increased temperature of evaporator. Another advantage is its optimal high side discharge pressure is much lower than CO2 , reducing by 16.2% most when the exit temperature of gas cooler is 40 ℃ correspondingly. Moreover, the discharge temperature and cooling capacity are also more preferred than CO2. Finally,the idea was put forward to improve the cycle performance by reducing the temperature of the exit gas cooler temperature and the optimal high side discharge pressure in the expander refrigeration cycle.

关 键 词：跨临界循环 N2O 两级压缩 膨胀机 

分 类 号：TB61[一般工业技术—制冷工程] TB653