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

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

Research output: Contribution to journalJournal articleResearchpeer-review

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.
Original languageEnglish
JournalInternational Journal of Refrigeration
Volume37
Pages (from-to)127–134
ISSN0140-7007
DOIs
Publication statusPublished - 2014

Keywords

  • Modelling
  • Flow maldistribution
  • Demagnetizing effects
  • Magnetic refrigeration

Cite this

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title = "The influence of non-magnetocaloric properties on the performance in parallel-plate AMRs",
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.",
keywords = "Modelling, Flow maldistribution, Demagnetizing effects, Magnetic refrigeration",
author = "Nielsen, {Kaspar Kirstein} and Bahl, {Christian R.H.} and Anders Smith and Kurt Engelbrecht and Olsen, {Ulrik Lund} and Nini Pryds",
year = "2014",
doi = "10.1016/j.ijrefrig.2013.09.022",
language = "English",
volume = "37",
pages = "127–134",
journal = "International Journal of Refrigeration",
issn = "0140-7007",
publisher = "Elsevier",

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The influence of non-magnetocaloric properties on the performance in parallel-plate AMRs. / Nielsen, Kaspar Kirstein; Bahl, Christian R.H.; Smith, Anders; Engelbrecht, Kurt; Olsen, Ulrik Lund; Pryds, Nini.

In: International Journal of Refrigeration, Vol. 37, 2014, p. 127–134.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - The influence of non-magnetocaloric properties on the performance in parallel-plate AMRs

AU - Nielsen, Kaspar Kirstein

AU - Bahl, Christian R.H.

AU - Smith, Anders

AU - Engelbrecht, Kurt

AU - Olsen, Ulrik Lund

AU - Pryds, Nini

PY - 2014

Y1 - 2014

N2 - 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.

AB - 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.

KW - Modelling

KW - Flow maldistribution

KW - Demagnetizing effects

KW - Magnetic refrigeration

U2 - 10.1016/j.ijrefrig.2013.09.022

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