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The influence of non-magnetocaloric properties on the performance in parallel-plate AMRs

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Authors:
  • Nielsen, Kaspar Kirstein ;
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    Orcid logo0000-0001-7938-4577
    Department of Energy Conversion and Storage, Technical University of Denmark
  • Bahl, Christian R.H. ;
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    Orcid logo0000-0002-1153-7183
    Department of Energy Conversion and Storage, Technical University of Denmark
  • Smith, Anders ;
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    Orcid logo0000-0003-2723-8812
    Department of Energy Conversion and Storage, Technical University of Denmark
  • Engelbrecht, Kurt ;
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    Orcid logo0000-0002-3713-9415
    Department of Energy Conversion and Storage, Technical University of Denmark
  • Olsen, Ulrik Lund ;
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    Department of Energy Conversion and Storage, Technical University of Denmark
  • Pryds, Nini
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    Orcid logo0000-0002-5718-7924
    Department of Energy Conversion and Storage, Technical University of Denmark
DOI:
10.1016/j.ijrefrig.2013.09.022
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. This paper reflects a summary of various recently published results.
Type:
Journal article
Language:
English
Published in:
International Journal of Refrigeration, 2014, Vol 37
Keywords:
Modelling; Flow maldistribution; Demagnetizing effects; Magnetic refrigeration
Main Research Area:
Science/technology
Publication Status:
Published
Review type:
Peer Review
Submission year:
2014
Scientific Level:
Scientific
ID:
255283140

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