Numerical Study of a 10 K Two Stage Pulse Tube Cryocooler with Precooling Inside the Pulse Tube

26th International Cryogenic Engineering Conference & International Cryogenic Materials Conference 2016

材料科学;物理学

Xiaomin, Pang^1,2 ; Xiaotao, Wang^1 ; Wei, Dai^1 ; Jianyin, Hu^1 ; Ercang, Luo^1

Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, China^1

Graduate University of Chinese Academy of Sciences, China^2

关键词: Carnot efficiency;    Cryo-pump;    Cryocoolers;    Cryogenic electronics;    High-efficiency;    Operating parameters;    Pulse tube cryocoolers;    Pulse tubes;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/171/1/012071/pdf
DOI  :  10.1088/1757-899X/171/1/012071

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

High efficiency cryocoolers working below 10 K have many applications such as cryo-pump, superconductor cooling and cryogenic electronics. This paper presents a thermally coupled two-stage pulse tube cryocooler system and its numeric analysis. The simulation results indicate that temperature distribution in the pulse tube has a significant impact on the system performance. So a precooling heat exchanger is put inside the second stage pulse tube for a deep investigation on its influence on the system performance. The influences of operating parameters such as precooling temperature, location of the precooling heat exchanger are discussed. Comparison of energy losses apparently show the advantages of the configuration which leads to an improvement on the efficiency. Finally, the cryocooler is predicted to be able to reach a relative Carnot efficiency of 10.7% at 10 K temperature.