Cooling-capacity characteristics of Helium-4 JT cryocoolers

Cryogenic Engineering Conference 2017

材料科学;物理学

Wang, Y.L.^1,2 ; Liu, D.L.^1,2 ; Gan, Z.H.^1,2,3 ; Guo, Y.X.^1,2 ; Shen, Y.W.^1,2 ; Chen, S.F.^1,2

Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou

310027, China^1

Key Lab. of Ref. and Cryo. Technology of Zhejiang Province, Hangzhou

310027, China^2

National Quality Inspection Center of Refrigeration Equipment (Henan), Minquan

476800, China^3

关键词: Cooling Capacity;    Cryocoolers;    High pressure;    Latent cooling;    Liquid helium temperature;    Temperature characteristic;    Thermo dynamic analysis;    Working fluid;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/278/1/012085/pdf
DOI  :  10.1088/1757-899X/278/1/012085

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Cooling capacity of a Helium-4 JT cryocooler may be achieved at a temperature higher than liquid helium temperature. The latent cooling capacity, which should be obtained at liquid helium temperature, is defined as a special part of cooling capacity. With the thermodynamic analysis on steady working conditions of a Helium-4 JT cryocooler, its cooling capacity and temperature characteristics are presented systematically. The effects of precooling temperature and high pressure on the cooling capacity and latent cooling capacity are illustrated. Furthermore, the JT cryocoolers using hydrogen and neon as the working fluids are also discussed. It is shown that helium JT cryocooler has a special cooling capacity characteristic which does not exist in JT cryocoolers using other pure working fluids.