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本文报道了一种应用于复叠制冷温区的多元混合工质节流制冷机。文中建立了多元混合工质节流制冷热力循环的优化分析模型 ,给出了多元混合工质选配与循环运行参数设计原则。针对于某一复叠温区制冷温度进行了优化计算 ,计算结果与文献中一经典复叠式制冷循环的理论计算结果进行了比较。结果表明 :在采用合理选配的混合物作制冷工质时 ,一次节流制冷循环其性能与经典复叠式制冷循环相当。在理论分析的同时 ,我们也进行了相应的实验研究 ,在采用 1/ 3HP的空调压缩机驱动下 ,采用两种混合工质分别取得了在 - 70℃有2 0W和 - 12 0℃有 11W的制冷量的实验结果。综合表明 :考虑到混合工质节流制冷系统的简单性与可靠性 ,混合物工质一次节流制冷有可能部分替代经典复叠式制冷方式。
This paper reports a multivariate mixed refrigerant throttling refrigerator applied to the cascade refrigeration temperature zone. In this paper, the optimization analysis model of the thermodynamic cycle of multivariate mixed refrigerant throttling and cooling is established, and the design principles of the multivariate mixed working fluid matching and circulating operating parameters are given. Aiming at the optimization of the cooling temperature in a certain overlapping zone, the calculation results are compared with the theoretical calculation results of a classical cascade refrigeration cycle in the literature. The results show that the performance of the primary throttling refrigeration cycle is equivalent to that of the classical cascade refrigeration cycle when using a reasonable and suitable mixture as the refrigerant. In the theoretical analysis, we also conducted a corresponding experimental study, the use of 1 / 3HP air-conditioning compressor driven by the use of two mixed working medium were obtained at 70 ℃ -20W and -120 ℃ have 11W The experimental results of the cooling capacity. The results show that, taking into account the simplicity and reliability of the refrigerant refrigeration system with mixed working fluids, it may be possible to partially replace the classical cascade refrigeration by using refrigerant once throttled.