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自复叠制冷循环具有获得制冷温度低优点,但其完全消耗的是高品位电能或机械能;喷射制冷具有利用低品位低温热源(60~100℃)制取冷量、且制冷温度较高时制冷效率高等优点,但难以获得较低制冷温度。因此,为了实现低品位热在低温冷冻领域高效利用并节省高品位电能,本文提出一种由低品位低温热源与电能联合驱动的混合工质喷射/压缩复合制冷循环。建立组成新循环各部件热力学数学模型,分析喷射器压缩比和压缩机压缩比对复合式制冷循环的热性能系数和机械性能系数影响,并与传统的自复叠制冷循环特性进行比较分析。研究表明,低品位热源与电能联合驱动喷射/压缩复合制冷循环较传统I刍复叠制冷循环可显著提高制冷效率并获得更低制冷温度。
Self-cascade refrigeration cycle has the advantage of obtaining low refrigeration temperature, but it completely consumes high-grade electric energy or mechanical energy. Injecting and cooling has the advantages of utilizing low-grade and low-temperature heat source (60-100 ° C) for cooling capacity and refrigeration when the refrigeration temperature is high High efficiency, but difficult to obtain a lower refrigeration temperature. Therefore, in order to achieve low-grade heat efficient use of low-temperature refrigeration and save high-grade energy, this paper presents a mixed refrigerant injection / compression refrigeration cycle driven by low-grade low-temperature heat source and electric energy. The thermodynamic mathematical model of the components of the new cycle was established. The influence of the compressor compression ratio and compressor compression ratio on the thermal coefficient and the mechanical coefficient of composite refrigeration cycle was analyzed. The characteristics of the refrigeration cycle were compared with the traditional self-stacked refrigeration cycle. The research shows that the combination of low-grade heat source and electric energy can significantly improve the refrigeration efficiency and achieve the lower refrigeration temperature when the combined injection / compression refrigeration cycle is more complex than the traditional refrigeration cycle.