多元混合工质内复叠节流结合涡流管复合循环的热力分析

Thermodynamic Analysis on Hybrid Refrigeration Cycle- Mixed-Refrigerant Auto-Cascade J-T Cycle Combined with Vortex Tube

针对多元混合工质内复叠节流循环和涡流管的特点 ,提出了一种新的复合循环流程 ,以期达到液氮以下的制冷温度。建立了适当的涡流管热力学模型 ,采用火用分析方法对复合制冷循环各部件进行了分析。在相同的条件下 ,对复合循环和内复叠循环的热力特性进行对比 ,结果表明 ,采用复合循环可以提高整个循环的火用效率 。

In this paper, a new type of compound refrigeration cycle combined Mixed-refrigerant Auto-Cascade J-T cycle with vortex tube is introduced, and expected to attain below liguid nitrogen temperature(77.4K). A thermodynamic model has been used to investigate vortex tube energy separation. The exergy method is applied to analyze the thermodynamic character of components and the whole refrigeration cycle. A comparison is made between the Auto-Cascade J-T cycle and the new type of compound refrigeration cycle at the same condition. The results show that using compound refrigeration cycle can improve exergy efficiency of the whole cycle. It is completely possible to attain below liquid nitrogen temperature(77.4K) and even lower temperature.