Speaker
Mr
Longyi Wang
(Institute of Refrigeration and Cryogenics, Zhejiang University)
Description
A pulse tube cryocooler can not reach the Carnot efficiency basically because the expansion work must be dissipated at the warm end of the pulse tube, thus the ideal efficiency of a PTC is only Tc/Th, which is less than the Carnot efficiency Tc/(Th-Tc). How to recover this amount of dissipated work is a key to improve the PTC efficiency. A cascade PTC is consisted of PTCs those are staged by transmission tubes in between, it can be a two-stages or even more stages, each stage is driven by the recovered work from the last stage by a well-designed long transmission tube. It’s shown that the more stages it has, the closer the efficiency will approach the Carnot efficiency. A two-stages cascade pulse tube cooler working at 233 K is designed, fabricated and tested in our lab, and experimental results show that the efficiency can be improved by 33%.
Primary author
Mr
Longyi Wang
(Institute of Refrigeration and Cryogenics, Zhejiang University)
Co-authors
Mr
Jiakai Zhu
(Institute of Refrigeration and Cryogenics, Zhejiang University)
Ms
Mei Wu
(Institute of Refrigeration and Cryogenics, Zhejiang University)
Ms
Xiao Sun
(Institute of Refrigeration and Cryogenics, Zhejiang University)
Prof.
Zhihua Gan
(Institute of Refrigeration and Cryogenics, Zhejiang University; State Key Laboratory of Clean Energy Utilization, Zhejiang University)
