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Investigation of the effect of demagnetizing field on magnetic refrigeration devices

Y. Chiba 1, A. Smaïli 2 and O. Sari 3

1 Département de Génie Mécanique, Faculté des Sciences et de la Technologie, Université de Médéa, 26 000, Médéa, Algeria.
2 Laboratoire de Génie Mécanique et Développement, Ecole Nationale Polytechnique, P.B. 182, El-Harrach, 16200 Algiers, Algeria.
3 University of Applied Sciences of Western Switzerland, Avenue des sports 20, 1400, Yverdon-Les-Bains, Switzerland.

Abstract

This paper presents a study of the effect of demagnetizing magnetic field on magnetic refrigeration device performances operating near room temperature. The test bench developed at HE-SO has been used for direct measurements of the magneto-caloric effect of Gadolinium under applied magnetic field of 2 T. For this purpose, a magnetic refrigeration device based upon the active magnetic regeneration (AMR) cycle has been used. To determine thermal performances of the cycle, a numerical 1D model based on the transient energy equations is used for modeling the heat exchange between the magneto-caloric material and the carrier fluid in the regenerator bed. The obtained results including the temperature span, the coefficient of performance and the cooling power are presented and discussed.

Keywords

Magneto-caloric effect, Demagnetization field, Numerical simulation, Thermal analysis.

Investigation of the effect of demagnetizing field on magnetic refrigeration devices
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