Investigation of a Magnetically Augmented Cryogenic Refrigerator
This paper describes a new type of cryogenic cycle which produces refrigeration by thermodynamically cycling both a magnetic material and a compressible fluid. The processes which compose the cycle are described and contrasted with a purely mechanical and purely magnetic cycle. Two mathematical models of the refrigerator are developed. The results of the simpler model are used to illustrate the mechanisms of entropy and energy flow. The more complex model is used to optimize the operating pressure ratio and mass ratio. It was determined that the proposed refrigeration cycle has the potential to produce significant refrigeration at a pressure ratio compatible with conventional cryocoolers and at moderate levels of applied field swing.
KeywordsHeat Exchanger Mass Flow Rate Pressure Ratio Refrigeration Cycle Magnetic Cycle
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