Solid state magnetic refrigerator

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• 作者：D.J. Silvap> ; p>p>djsilva99@gmail.comp> ; B.D. Bordalo ; A.M. Pereira ; J. Ventura ; J.P. Araú ; jop> ; p>p>jearaujo@fc.up.ptp>
• 关键词：Magnetocaloric effect ; Magnetic refrigerator ; Solid state refrigerator ; Micro cooling ; Simulation
• 刊名：Applied Energy
• 出版年：2012
• 出版时间：May, 2012
• 年：2012
• 卷：93
• 期：Complete
• 页码：570-574
• 全文大小：675 K

文摘

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 ?.75 W cmp>?p> was obtained for an operating temperature of ?96 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 ?.5, making it a viable alternative to thermoelectric refrigeration.