Partager

Document IIF

Étude expérimentale sur l'effet de l'hystérésis thermique sur des matériaux de MnFeP1-xAsx, appliqués à un dispositif à régénération active magnétique.

Experimental investigation of the effect of thermal hysteresis in MnFeP1-xAsx materials applied in an AMR device.

Numéro : sect. 2

Auteurs : MOOS L. von, NIELSEN K. K., ENGELBRECHT K., et al.

Résumé

The magnetocaloric material series MnFeP1-xAsx, exhibiting a 1st order phase transition are possibly good candidates for magnetic refrigeration devices operating at room temperature (Brück et al., 2005). These materials have intrinsic hysteresis (thermal and magnetic) and the impact of this on magnetic refrigeration devices has not yet been thoroughly investigated in the literature. Here, the thermal hysteretic magnetocaloric properties are studied using vibrating sample magnetometry and how this influences actual refrigeration performance, using an established active magnetic regenerator (AMR) test device (Bahl et al., 2008) with a flat plate regenerator of a single Curie temperature material. We find that the maximum adiabatic entropy change does not depend on the thermal history of the material, but the peak temperature is shifted 1.5 K for fields up to 1.5 T when measured at a constant field during heating or cooling. There is possibly an increase of the entropy change peak width of 0.3 K when cooling compared to heating. These results are confirmed by experiments on an AMR test device.

Documents disponibles

Format PDF

Pages : 193-198

Disponible

  • Prix public

    20 €

  • Prix membre*

    Gratuit

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : Experimental investigation of the effect of thermal hysteresis in MnFeP1-xAsx materials applied in an AMR device.
  • Identifiant de la fiche : 30005516
  • Langues : Anglais
  • Source : 5th International Conference on Magnetic Refrigeration at Room Temperature (Thermag V). Proceedings: Grenoble, France, September 17-20, 2012.
  • Date d'édition : 17/09/2012

Liens


Voir d'autres communications du même compte rendu (70)
Voir le compte rendu de la conférence

Indexation