Study on a cascade pulse tube cooler with energy recovery: new method for approaching Carnot

Cryogenic Engineering Conference 2015

材料科学;物理学

Wang, L.Y.^1,2 ; Wu, M.^1,2 ; Zhu, J.K.^1,2 ; Jin, Z.Y.^1,2 ; Sun, X.^1,2 ; Gan, Z.H.^1,2

Institute of Cryogenics and Refrigeration, Zhejiang University, Hangzhou

310027, China^1

Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province, Hangzhou

310027, China^2

关键词: Carnot efficiency;    Energy recovery;    Last stage;    Pulse tube coolers;    Pulse tube cryocoolers;    Pulse tubes;    Single stage;    Two-stage;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/101/1/012182/pdf
DOI  :  10.1088/1757-899X/101/1/012182

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

A pulse tube cryocooler (PTC) can not achieve Carnot efficiency because the expansion work must be dissipated at the warm end of the pulse tube. How to recover this amount of dissipated work is a key for improving the PTC efficiency. A cascade PTC consists of PTCs those are staged by transmission tubes in between, these can be a two-stage or even more stages, each stage is driven by the recovered work from the last stage by a well-designed long transmission tube. It is shown that the more stages it has, the closer the efficiency will approach the Carnot efficiency. A two-stage cascade pulse tube cooler consisted of a primary and a secondary stage working at 233 K is designed, fabricated and tested in our lab. Experimental results show that the efficiency is improved by 33% compared with the single stage PTC.