28 June 2015 to 2 July 2015
JW Marriott Starr Pass Resort
Etc/GMT-7 timezone

Finite-Time Thermodynamic optimization of a large-scale helium Brayton cryo-refrigerator with static gas bearing turboexpander

Not scheduled
2h
JW Marriott Starr Pass Resort

JW Marriott Starr Pass Resort

Tucson, Arizona USA
Poster Presentation CEC-01 - Large-Scale Refrigeration and Liquefaction

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.

Primary 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)

Presentation Materials

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