Preliminary Design of a 100 W 1.8 K to 4.7 K Regenerative Magnetic Refrigerator
An Active Magnetic Regenerator (AMR.) is designed to operate in the 1.8 K to 4.7 K range using a particle bed of gadolinium gallium garnet (GGG) as the magnetic material and liquid helium as the heat transfer fluid. A detailed mode] of the design is described in which all relevant physical and material properties are included. Using conservative operating parameters, a 100 W device is possible with COP efficiency relative to Carnot in the 40 to 50% range and a bed volume of less than 5 liters. In addition to its compact nature and high efficiency, the design offers the advantages of having only two moving parts operating at low speed, and operating pressure greater than one atmosphere.
KeywordsVortex Porosity Convection Helium Assure
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