一种新型喷射制冷循环的理论分析  

Theoretical Analysis on New Ejector Refrigeration Cycle

作　　者：陈华[1] 鱼剑琳[1] 任云锋[1] 厉彦忠[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》2005年第11期1215-1218,1240,共5页Journal of Xi'an Jiaotong University

摘　　要：提出了一种新型喷射制冷循环.该循环系统是在常规喷射制冷循环的喷射器和冷凝器之间增加了一个液体-气体射流泵,通过该射流泵可以降低喷射器的背压,提高喷射器的喷射系数,进而改善循环性能.针对此循环进行了理论分析和模拟计算,并与相同工况下常规喷射系统做了比较,重点讨论了工质R134a发生温度和背压改变对系统性能系数的影响.计算结果显示,新循环能有效提高系统的性能系数,使其比常规循环提高1倍以上.尽管新循环消耗的泵功会有所增加,但从(火用)的角度分析,新循环可以节约10%～24%的输入,具有更高的(火用)效率.A new ejector refrigeration system （NERS） was proposed. This NERS has an additional liquidgas jet pump arranged between the ejector and the condenser of a conventional ejector refrigeration system （CERS）. The jet pump is used to decrease the backpressure of the ejector, thus the entrainment ratio and the coefficient of performance （COP） of NERS can be increased. The theoretical analysis and simulation calculation were carried out for NERS. The comparison between NERS and CERS was conducted under the same operating condition. For R134a, the variation of the new system＇s COP with generating temperature and backpressure was mainly discussed. The calculation results show that COP of NERS can be increased by more than 100% compared with that of CERS. Though more pump work is consumed in NERS, from the point of view of exergy, NERS can save 10%～24% input exergy and is of higher exergetic efficiency.

关 键 词：喷射制冷 喷射器 射流泵 

分 类 号：TB61[一般工业技术—制冷工程]