A cryogenic heat exchanger with bypass and throttling and its thermodynamic analysis

[摘要] A precooled Joule-Thomson (J-T) cooler refrigerates at liquid helium temperature. Its third stage heat exchanger works below 20 K. Hot fluid cannot be sufficiently cooled due to nonidealism of the heat exchanger and helium-4 properties. In a J-T cycle of low pressure ratio, the heat exchanger with bypass and throttling improves the refrigeration capacity. Bypass and throttling reduces the temperature difference and entropy generation within the heat exchanger.

[发布机构] Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou; 310027, China^1;Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province, Hangzhou; 310027, China^2

[效力级别] 物理学 [学科分类] 材料科学（综合）

[关键词] Entropy generation;Hot fluids;Joule-Thomson;Liquid helium temperature;Low pressures;Refrigeration capacity;Temperature differences;Thermo dynamic analysis