Thursday August 29, 2019 from 13:30 to 15:10
Investigations on the thermodynamic characteristics of a high-efficiency three-stage linear compressor system for a 1-2 K Joule-Thompson cryocooler
Tao ZHANG1,2, Rui ZHA1,2, Jun TAN1,3, Jiaqi LI1,2, Yongjiang ZHAO1,2, Bangjian ZHAO1,2, Haizheng DANG1,3.
1Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai, People's Republic of China; 2University of Chinese Academy of Sciences, Beijing, People's Republic of China; 3Shanghai Boreas Cryogenics Co., Ltd, Shanghai, People's Republic of China
The high-efficiency linear compressor is critical to the Joule-Thomson (JT) cryocooler working at 1-2 K. A three-stage linear compressor system is developed. The system components and the inner structure of the compressor are illustrated and described in detail.
The electrical, mechanical and thermal energy conversions and the compression losses in the compressor are theoretically analyzed. In particular, the mass flow rates and pressure distributions among the three stages are investigated in depth.
An experimental setup is established to test the performance of the three stages separately. The testing results show that, each JT compressor can achieve the aimed suction and discharge pressures.
With a total input power of 90.5 W, the developed JT cryocooler is expected to achieve the no-load temperatures of 2.2 K and 1.42 K with He-4 and He-3 as working fluid, respectively. The further experimental investigations and verifications are underway.