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Solid state magnetic refrigerator
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DOI：10.1016/j.apenergy.2011.12.002.png)
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The viability and operation of a fully solid state magnetic refrigeration system with envisaged applications on chip, sensor and device cooling is here tested using numerical simulations. The proposed system relies on the combined use of materials displaying the magnetocaloric effect and of materials whose thermal conductivities are controlled by an external magnetic field. This allows the switching of the heat flow direction in sync with the temperature variation of the magnetocaloric material, removing the necessity to use fluids which has for long hindered the implementation of magnetic refrigeration. We have found the optimum operating conditions of the proposed refrigerator, for which a cooling power density of similar to 2.75 W cm(-2) was obtained for an operating temperature of similar to 296 K, using Gadolinium as the magnetocaloric material and an applied magnetic field of 1 T. The coefficient of performance (COP) achieved by this refrigerator was found to be COP similar to 1.5, making it a viable alternative to thermoelectric refrigeration. (C) 2011 Elsevier Ltd. All rights reserved.
Keyword:
Magnetocaloric effect
Magnetic refrigerator
Solid state refrigerator
Micro cooling
Simulation
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11
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2.6W
被引数:
17.8W
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