Speaker
Dr
Qiang Li
(Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)
Description
Large-scale helium cryo-refrigerator is widely used in superconducting systems, nuclear fusion engineering, and scientific researches etc., however, its energy efficiency is quite low. We built a 2kW at 20.0K helium Brayton cryo-refrigerator. As to the characteristics of the plant/cycle, we put forward a model of helium Brayton cryo-refrigerator/cycle according to finite-time thermodynamics. Analytical expressions of cooling capacity and COP are obtained, and we found that the expressions are piecewise functions. Further, comparison between the model and the experimental results for cooling capacity of the helium cryo-refrigerator shows that error is less than 7.6%. Effects of the pressure ratio, efficiency of turbine and compressor, etc. on cooling capacity and COP of the helium cryo-refrigerator are investigated. In a word, this study provides a better understanding of energy conversion and utilization of the cycle and helps to optimize it.
Author
Dr
Yu Zhang
(Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)
Co-authors
Dr
Bingming Wang
(Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)
Prof.
Jihao Wu
(Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)
Mr
Peng Zhang
(School of Energy and Power Engineering, HuaZhong University of Science and Technology)
Dr
Qiang Li
(Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)
Prof.
Qing Li
(Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)
Mr
Wenhai Lu
(Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)
Mr
Xiangdong Xu
(Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)
Dr
Xiujuan Xie
(Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)
Dr
Yinan Qiu
(Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)
Mr
Yu Sun
(Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)
Prof.
lianyou Xiong
(Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)
Mr
lijia Sun
(Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)
Prof.
liqiang Liu
(Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)
