CO_2-NH_3压缩/喷射复叠循环理论研究  

Theoretical Research on CO_2-NH_3 Compression/Ejection Cascade Cycle

作　　者：马利蓉[1] 马一太[1] 管海清[1] 

机构地区：[1]天津大学,天津300072

出　　处：《流体机械》2005年第10期57-60,共4页Fluid Machinery

基　　金：高等学校博士学科专项科研基金(D0200105)

摘　　要：为利用CO2跨临界循环气体冷却器放热段较大的温度滑移,减小节流部分的膨胀功损失,提高系统性能,可在制冷系统中利用CO2跨临界循环与NH3喷射循环复合实现压缩/喷射复叠式系统。在对系统进行热力学分析的基础上,建立了相应的模型。计算结果表明:NH3循环喷射器引射流体温度和出口的冷凝温度对引射系数影响很大,在较高引射流体温度和较低冷凝温度下,CO2跨临界压缩/喷射制冷循环可以得到较高的循环性能。在较低CO2跨临界循环蒸发温度和压缩机效率时,此循环相对基本循环有明显优势。降低发生器温差也是提高循环性能的途径之一。An ejector could be adopted in refrigeration systems to reduce the irreversible energy loss of throttling process and realize a CO2-NH3 compression/ejection cascade cycle. To improve the energy efficiency ratio （EER） of the CO2 system with considering the rather large temperature gliding of the heat rejection process in the gas cooler, Based on thermodynamic analysis of the system, a corresponding model is founded. The calculation results show that the temperature of injected working fluid and the condensing temperature in the NH3 cycle have great impacts on the injection coefficient. Increasing the temperature of injected working fluid and decreasing the condensing temperature in the NH3 cycle are effective ways of improving EER . CO2-NH3 compression/ejection cascade cycle has an advantage over the basic CO2 transcritical cycle when the evaporating temperature and the efficiency of compressor is relatively low. Furthermore, reducing the temperature difference of the generator is helpful for increasing EER .

关 键 词：CO2跨临界循环 压缩/喷射制冷循环 喷射器 能效比(EER) 

分 类 号：TB61[一般工业技术—制冷工程]