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在R744/R717复叠式制冷系统中加入了引射器来回收膨胀功,并根据热力学第一定律建立分析模型。研究了中间冷凝温度、冷凝温度、蒸发温度和引射器组件效率对COP的影响。发现存在一个最佳中间冷凝温度使得系统COP达到最大值;在给定的条件下,与传统的复叠式制冷系统相比,带引射器的复叠式制冷系统的COP提高了6.4%~7.8%,并且引射器组件的效率越高,制冷系统的COP提升越明显。
In the R744 / R717 cascade refrigeration system, an ejector is added to recover the expansion work, and the analysis model is established according to the first law of thermodynamics. The effects of intermediate condensation temperature, condensation temperature, evaporation temperature and ejector assembly efficiency on COP were studied. It is found that there is an optimal intermediate condensation temperature to reach the maximum COP of the system. Under given conditions, the COP of the cascade refrigeration system with ejector increases by 6.4% ~ 6.0% compared with the traditional cascade refrigeration system, 7.8%, and the higher the efficiency of the ejector assembly, the more obvious the COP improvement of the refrigeration system.