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对改进Claude循环的大型氦低温制冷系统建立能量平衡方程,得出循环效率的计算公式。对氦低温制冷系统的制冷模式和液化模式进行热力分析,找出循环中各个参数之间的关系,并提炼出关键的独立变量:压缩机出口压力,透平膨胀机的分流率和换热器效率。利用流程软件对改进Claude循环的大型氦低温制冷系统建立静态模型,分析了压缩机出口压力,透平膨胀机的分流率和换热器效率与循环效率的关系,从而找出系统的最优设计参数。
The energy balance equation is established for the large helium cryogenic refrigeration system with improved Claude cycle, and the calculation formula of the cycle efficiency is obtained. The thermodynamic analysis of cooling mode and liquefaction mode of the helium cryogenic refrigeration system is carried out to find out the relationship between the parameters of the cycle and to extract the key independent variables: compressor outlet pressure, turbine expander split rate and heat exchanger effectiveness. A static model of large-scale helium cryogenic refrigeration system with improved Claude cycle was established by using the software of flow. The outlet pressure of the compressor, the turbulence ratio of the expander and the relationship between the heat exchanger efficiency and cycle efficiency were analyzed to find out the optimum design of the system parameter.