4.5 Article

Permanent magnet magnetic refrigerator design and experimental characterization

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ELSEVIER SCI LTD
DOI: 10.1016/j.ijrefrig.2010.12.009

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Magnetic refrigerator; Magnet; Magnetic field; Gadolinium; Regenerator; Curie; Cop

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Magnetic refrigeration (MR) using permanent magnets is being investigated for near-room temperature applications. An MR prototype is described and results using gadolinium as refrigerant are presented. Important design features are simple sealing, compactness, high operating frequencies, and ease of use. Using a total of 110 g of refrigerant, the device produces a maximum temperature span under no thermal load of 29 degrees C, and 10 degrees C under SOW. The overall COP determined by using the power to the drive motor is between 0.3 and 0.8 under most operating conditions and temperature spans. The maximum COP measured is 1.6 with a span of 2.5 degrees C when operating at 1.4 Hz and utilization of 1.28. If the inefficiency of the motor is removed the maximum COP is 2.2, and, when the magnet drive losses are excluded, the maximum COP becomes 10. The peak specific exergetic cooling power is 0.085 W T-1 cm(-3). (c) 2010 Elsevier Ltd and IIR. All rights reserved.

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