Performance investigation of a high-field active magnetic regenerator

Date
2018-12-08
Authors
Teyber, Reed
Holladay, Jamelyn
Meinhardt, Kerry
Polikarpov, Evgueni
Thomsen, Edwin
Cui, Jun
Rowe, Andrew
Barclay, John
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Altmetrics
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Research Projects
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Ames Laboratory
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Abstract

Regenerative magnetic cycles are of interest for small-scale, high-efficiency cryogen liquefiers; however, commercially relevant performance has yet to be demonstrated. To develop improved engineering prototypes, an efficient modeling tool is required to screen the multi-parameter design space. In this work, we describe an active magnetic regenerative refrigerator prototype using a high-field superconducting magnet that produces a 100 K temperature span. Using the experimental data, a semi-analytic AMR element model is validated and enhanced system performance is simulated using liquid propane as a heat transfer fluid. In addition, the regenerator composition and fluid flow are simultaneously optimized using a differential evolution algorithm. Simulation results indicate that a natural gas liquefier with a 160 K temperature span and a second-law efficiency exceeding 20% is achievable.

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Keywords
Active magnetic regenerator, Magnetocaloric effect, Superconducting magnet, Liquefaction, Optimization
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