压缩/喷射混合制冷系统喷射器设计及其变工况特性探讨

Ejector in Compression/Ejection Hybrid Refrigerator:Design and Performances

对压缩/喷射混合制冷循环的喷射器混合室直径的确定方法进行了探讨,并对不同制冷工况下喷射器的工作特性进行了理论探讨.结果表明:对于一定喷射系数的制冷系统,存在一个最佳喷射器混合室直径,使得压缩/喷射混合制冷循环的性能最优;当喷射器的运行工况偏离设计工况时,喷射器的制冷量和压缩/喷射混合制冷循环的理论制冷系数也会偏离设计性能,但压缩/喷射混合制冷系统的理论制冷量随工况的变化比传统制冷系统小.

This paper presents a method to determine diameter of mixing chamber in the ejector of a vapor compression/ ejection hybrid refrigeration system （VCEHRS）, and discusses its performances that vary with the working condition. The results show that an Optimum diameter exists, corresponding to the maximum COP of VCEHRS. The performance deviates from the designing target when the working condition varies. The variation of refrigeration capacity of VCEHRS is smaller than that of traditional refrigeration systems.