CO_2双蒸发器压缩／喷射式跨临界制冷循环  

CO_2 TRANSCRITICAL COMPRESSION/EJECTION HYBRID REFRIGERATION CYCLE WITH TWO EVAPORATORS

作　　者：马一太[1] 管海清[1] 杨俊兰[1] 刘圣春[1] 

机构地区：[1]天津大学热能研究所,天津300072

出　　处：《太阳能学报》2006年第1期73-77,共5页Acta Energiae Solaris Sinica

基　　金：高等学校博士学科专项科研基金(D0200105)

摘　　要：为减小CO_2跨临界循环系统节流部分的膨胀功损失,提高系统性能,可在小型制冷系统中采用喷射器代替节流阀,部分回收工质从高压到低压过程的膨胀功。在对系统进行热力学分析的基础上,建立了CO_2跨临界压缩／喷射制冷循环的效率分析模型。计算结果表明：在合理的喷射器出口背压下,CO_2跨临界压缩／喷射制冷循环可以得到较高的循环性能。蒸发温度和气体冷却器出口温度两工况的变化对该系统性能的影响程度相对较大。在较低蒸发温度下,该系统可以明显降低压缩机出口温度,有利于系统稳定运行。An ejector should be adopted in some low cooling-capacity refrigerating systems instead of a throttle valve to recover some high-pressure potential power and reduce the irreversible energy loss of throttle process for improving the energy efficiency ratio （EER） of the CO2 system. Based on thermodynamic analysis of the CO2 compression/ejection cycle refrigeration system, an efficiency analysis model was founded. The calculation results illustrated that a favorable EER can be gotten with the reasonable back pressure of the ejector. Variations of beth evaporating temperature and gas-cooler exit temperature have strong impacts on the EER of the system. A relative low discharge temperature of compressor can be obtained especially when the evaporating temperature is low, which is favorable for the steady operation of the system.

关 键 词：CO2跨临界循环 压缩 喷射制冷循环 喷射器 能效比 

分 类 号：TB611[一般工业技术—制冷工程]