The influence of non-magnetocaloric properties on the AMR performance

Kaspar Kirstein Nielsen, Christian Bahl, Anders Smith, Kurt Engelbrecht, Ulrik Lund Olsen, Nini Pryds

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Abstract

The performance of Active Magnetic Regenerators (AMR) does not depend solely on the magnetocaloric effect of their constituents. Rather, it depends on several additional parameters, including, magnetic field, geometry (hydraulic diameter, cross-sectional area, regenerator length etc.), thermal properties (conductivity, specific heat and mass density) and operating parameters (utilization, frequency, number of transfer units etc.). In this paper we focus on the influence of three parameters on regenerator performance: 1) Solid thermal conductivity, 2) magnetostatic demagnetization and 3) flow maldistribution due to geometrically non-uniform regenerators.
It is shown that the AMR performance is optimal at an intermediate value of the solid thermal conductivity for many operating conditions. The magnetostatic demagnetization is shown to have a significant influence on the AMR performance, giving a strong dependence on the orientation of the applied field and the regenerator geometry. Finally, the flow maldistribution of non-uniform regenerator geometries is found to degrade the AMR performance even at minor deviations from perfectly homogeneous regenerator matrices.
Original languageEnglish
Title of host publicationProceedings of the fifth IIF-IIR International Conference on Magnetic Refrigeration at Room Temperature : Thermag V
Number of pages8
Publication date2012
Publication statusPublished - 2012
Event5th IIF-IIR International Conference on Magnetic Refrigeration at Room Temperature - Grenoble, France
Duration: 17 Sep 201220 Sep 2012
Conference number: 5
http://thermagv.grenoble.cnrs.fr/

Conference

Conference5th IIF-IIR International Conference on Magnetic Refrigeration at Room Temperature
Number5
CountryFrance
CityGrenoble
Period17/09/201220/09/2012
Internet address

Keywords

  • active magnetic regenerators

Cite this

Nielsen, K. K., Bahl, C., Smith, A., Engelbrecht, K., Olsen, U. L., & Pryds, N. (2012). The influence of non-magnetocaloric properties on the AMR performance. In Proceedings of the fifth IIF-IIR International Conference on Magnetic Refrigeration at Room Temperature: Thermag V