Investigation on the room temperature active magnetic regenerative refrigerator with permanent magnet array

Abstract

In this study, a room temperature active magnetic regenerative refrigerator is investigated experimentally as well as numerically. Gadolinium is selected as a magnetic refrigerant. A permanent magnet array, so called Halbach array, is employed to produce strong magnetic field. The AMR (Active Magnetic Regenerator) is reciprocated through the bore of the magnet array and produces cooling power. Helium is supplied by a helium compressor equipped with a rotary valve. Although the refrigeration effect is generated due to the pressure fluctuation of the helium flow, the enhancement of refrigeration by the magnetocaloric effect can be observed. One dimensional numerical simulation for the AMR is established. Measured mass flow rate, inlet temperature and pressure fluctuation are used as boundary conditions, and the calculated temperature distribution during the steady state is compared with the measured one. The model and the numerical simulation in this paper will be a useful tool for prediction of AMR's performance and investigation of the internal state of AMR. © 2010 American Institute of Physics.