High-frequency magnetocaloric modules with heat gates operating with the Peltier effect

Magnetic heat pumps, refrigerators and energy conversion prototypes, with an operation based on the magnetocaloric effect, usually show a restriction in their frequency of operation to a few Hertz. In 2010 it was proposed to apply thermal switches to overcome this barrier. In this article thermal sw...

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Bibliographic Details
Published in:International journal of refrigeration 2014-01, Vol.37, p.176-184
Main Authors: Egolf, P.W., Gravier, L., Francfort, T., Pawlowski, A.-G., Courret, G., Croci, M.
Format: Article
Language:English
Subjects:
Effet Seebeck
Eléments de l'effet Peltier
Froid magnétique
Haute-fréquence
High-frequency
Interrupteurs thermiques
Magnetic refrigeration
Magnetocalorics
Magnétocalorique
Peltier elements
Seebeck effect
Thermal switches
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Summary:Magnetic heat pumps, refrigerators and energy conversion prototypes, with an operation based on the magnetocaloric effect, usually show a restriction in their frequency of operation to a few Hertz. In 2010 it was proposed to apply thermal switches to overcome this barrier. In this article thermal switches built with Ni-nanowire Peltier elements are presented and the performance of such elements is discussed on a theoretical and experimental basis. Finally an approximate estimate of the performance of a magnetic refrigerator of the types built up to present is compared to that of a magnetic refrigerator applying nanowire thermal switches. •A new alternative method for magnetic refrigeration.•High-frequency device is more efficient and economical.•Applicable to magnetic heating, refrigeration and energy conversion.
ISSN:0140-7007
1879-2081
DOI:10.1016/j.ijrefrig.2013.09.028