Study of staging method for a 25 K two stage pulse tube cooler

27th International Cryogenics Engineering Conference and International Cryogenic Materials Conference 2018

Kranthi, J.K.^1 ; Jacob, S.^1 ; Karunanithi, R.^1 ; Narasimham, Gsvl^2

Centre for Cryogenic Technology, Indian Institute of Science, Bengaluru, India^1

Dept. of Mechanical Engineering, Indian Institute of Science, Bengaluru, India^2

关键词: Cooling power;    Multi stage;    Pressure wave generators;    Pulse tube coolers;    Pulse tubes;    Regenerator effectiveness;    Single stage;    Staging-method;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/502/1/012021/pdf
DOI  :  10.1088/1757-899X/502/1/012021

来源: IOP

【 摘 要 】

Staging method refers to the arrangement of regenerators and pulse tube(s) in a multi stage pulse tube cooler(PTC). This paper describes the study of two staging methods for a 25 K two stage pulse tube cooler. Staging method 1, a thermally coupled, inline staging design, was studied using SAGE and by developing an experimental PTC. A no load temperature of 40.4 K was achieved by the experimental PTC. The effect of regenerator configuration was studied by varying the regenerator length. Experimental results show a detrimental interplay of pressure drop and regenerator effectiveness resulting in higher no load temperatures. Staging method 2, consisting of thermally linked single stage 80 K PTC and two stage 25 K PTC, was studied using a SAGE model. The mass flow from the pressure wave generator is bifurcated to the PTCs; thus reducing pressure drop and regenerator ineffectiveness losses by 79% and 42% respectively. With staging method 2, a design cooling power of 1.98 W at 25 K is obtained.