基于可用能和熵产分析500W/4.5K氦制冷机优化

Optimization of 500 W/4.5 K helium refrigerator based on exergy and entropy generation analysis

利用流程模拟软件对500 W/4.5 K氦制冷机建立静态模型,建立制冷循环的可用能效率以及系统熵产的分析公式。选取透平路分流系数、透平路中间压力、透平路进口温度和压机出口压力关键参数为研究对象,采取氦制冷机的可用能效率分析和系统熵产分析相结合的研究方法,对氦制冷流程进行优化分析。优化后的500 W/4.5 K氦制冷机的透平路分流系数为50%,透平路中间压力为4.7 bar,透平路进口温度为30 K,压机出口压力为10 bar。通过对氦制冷机的性能优化,极大提高了运行效率,减小了能耗。

A static model of 500 W/4.5 K helium refrigerator was established by process simulation software, and the exergy efficiency and entropy generation formulas were obtained. Key parameters of the turbine mass-flow ratio, turbine intermediate pressure, turbine inlet temperature and compressor outlet pressure were selected as the research objects. The available exergy efficiency and entropy generation of the helium refrigerator were adopted to optimize the helium refrigeration process. The optimized 500 W/4.5 K helium refrigerator has turbine mass-flow ratio of 50 %, turbine intermediate pressure of 4.7 bar, turbine inlet temperature of 30 K and compressor outlet pressure of 10 bar. By optimizing the performance of helium refrigerator, the operating efficiency is improved and the energy consumption is greatly reduced.