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Évaluation d'un oxyde Pr2/3Sr1/3MnO3 en refroidissement magnétique.

Assessment of near Pr2/3Sr1/3MnO3 oxide in magnetic cooling.

Auteurs : CHDIL O., BALLI M., RANGO P. de, EL MAALAM K., EL BOUKILI A., MOUNKACHI O.

Type d'article : Article de la RIF

Résumé

In this work, we report a detailed study of the thermodynamic performance of Pr0.6Sr0.4MnO3 in a functional magnetic cooling system up to the theoretical limit of its magnetocaloric effect. For this purpose, a one-dimensional numerical model of the active magnetic regenerator (AMR) cycle is developed, while the required magnetocaloric properties of the oxide are calculated in the framework of mean field theory. The obtained results are deeply analyzed and then compared with the reference gadolinium metal. Particularly, it is revealed that using Pr0.6Sr0.4MnO3 as refrigerant requires high magnetic fields to generate reasonable temperature spans for practical applications, as it was found that under a magnetic field of 8 T, the studied oxide can generate an AMR temperature span of 33 K. The thermodynamic efficiency was evaluated by directly considering the work arising from the magnetic forces between the Pr0.6Sr0.4MnO3 regenerator and the magnetic field source, as the associated magnetic work is numerically calculated by using Altair Flux 3D software. From the obtained results, it was found that the coefficient of performance can be enhanced by a factor of two when balancing magnetic forces, despite of the moderate magnetocaloric effect shown by Pr0.6Sr0.4MnO3 under the practical fields going from 1 to 2 T. Moreover, the hidden thermodynamic performances of this compound are also pointed out by investigating its magnetocaloric properties in the theoretical limit zone. In this way, our calculations unveil that it is possible to reach cold source temperatures under -22 °C even when using helium as heat transfer fluid.

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Pages : 302-312

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Détails

  • Titre original : Assessment of near Pr2/3Sr1/3MnO3 oxide in magnetic cooling.
  • Identifiant de la fiche : 30029282
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 133
  • Date d'édition : 01/2022
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2021.10.005

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