Journal
INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID
Volume 37, Issue -, Pages 99-105Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrefrig.2013.09.024
Keywords
Permanent magnet magnetic refrigerator; AMR cycle
Categories
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
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A second-generation room-temperature permanent magnet active magnetic regenerator test apparatus using Halbach arrays is described. The magnet arrays consist of three concentric cylinders. Each cylinder is constructed using 12 permanent magnet segments. The inner magnet array is stationary while the intermediate and outer arrays are designed to rotate in opposite directions so as to create a sinusoidal magnetic field waveform with a stationary field direction. The fluid flow system utilizes a novel check valve configuration so that fluid dead volumes are minimized. The system construction is modular to allow for quick replacement of material or system components. Fringing fields near the outer and inner diameters of the arrays are found to create large forces between arrays leading to large torques. Test results using 650 g of gadolinium spheres produce a no-load temperature span of 33 K at 0.8 Hz. (C) 2013 Elsevier Ltd and IIR. All rights reserved.
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