Experimental investigation of 20 K two-stage layered active magnetic regenerative refrigerator

Cryogenic Engineering Conference 2015

材料科学;物理学

Park, Inmyong^1 ; Jeong, Sangkwon^1

Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, 373-1, Guseong-dong, Yuseong-gu, Daejeon

305-701, Korea, Republic of^1

关键词: Cryogenic temperatures;    Experimental investigations;    Helium compressors;    Hot film sensors;    Low temperature superconducting magnets;    Mass flow meters;    Pressure swing;    Temperature span;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/101/1/012106/pdf
DOI  :  10.1088/1757-899X/101/1/012106

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The performance of a two-stage layered AMRR is experimentally investigated. The test apparatus includes two-stage layered AMRs, low temperature superconducting (LTS) magnet which generates maximum magnetic field of 4 T, and the helium gas flow system. The helium compressor with the tandem rotary valve is employed to generate the oscillating flow of the helium gas minimizing the pressure swing effect. The mass flow rate of working fluid is controlled separately at the first and second stages of the AMR by solenoid valves. The mass flow rate of the AMRs is measured by the mass flow meter and the cryogenic hot-film sensor which is calibrated at cryogenic temperature range from 20 K to 77 K. In order to reduce the heat leak by shuttle heat transfer of the working fluid, void volumes have been implemented and connected to the cold ends of the AMR1 and AMR2. The temperature span of the AMR is recorded as 52 K and the performance of the AMR with the variation of the mass flow rate is analysed. The results show that the mass flow rate and the heat leak due to the shuttle heat transfer by oscillating working fluid are crucial factors in the AMR performance.