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

Cryogenic Engineering Conference 2015

材料科学;物理学

Tao, X.^1,2 ; Liu, D.L.^1,2 ; Wang, L.Y.^1,2 ; Shen, J.^1,2 ; Gan, Z.H.^1,2

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

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

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/101/1/012167/pdf
DOI  :  10.1088/1757-899X/101/1/012167

学科分类：材料科学（综合）

来源: IOP

【 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.