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Numerical study of magnetic refrigeration including consideration of magnetic nanocomposites.

Author(s) : CARPETIS C.

Summary

Magnetic refrigeration cycles are numerically simulated by modelling both the thermodynamic properties of the refrigerant and the heat transfer to the gas flow. For magnetic refrigeration above about 20 K, rare earth metals and their alloys are suitable refrigerants. In addition to these materials the authors also consider nanocomposites. In this case, there are enhanced magnetocaloric effects. The authors extend the modified molecular field treatment used in the case of ordinary magnetic materials in order to calculate the entropy function of the nanocomposites. As a final result of the numerical study, the quality factor can be presented as a function of the temperature span and the operational frequency. The analytical approach described in the paper illustrates the influence of several design parameters. The computational model of the refrigerant and the entropy functions of the magnetic materials, in particular for the case of the nanocomposites, are discussed first. In the subsequent description of the refrigerator model the quasi-stationary temperature profiles in the refrigerant are discussed for the particular case of the active magnetic regeneration. Results for the efficiency of the magnetic Brayton process are presented for both (external and magnetically active) regeneration cases.

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Pages: 331-338

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Details

  • Original title: Numerical study of magnetic refrigeration including consideration of magnetic nanocomposites.
  • Record ID : 1993-1204
  • Languages: English
  • Source: New challenges in refrigeration. Proceedings of the XVIIIth International Congress of Refrigeration, August 10-17, 1991, Montreal, Quebec, Canada.
  • Publication date: 1991/08/10
  • Document available for consultation in the library of the IIR headquarters only.

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