Permanent Magnet Sources for Magnetic Refrigeration
Résumé
Several permanent magnet structures have been proposed for magnetic refrigeration but it remains diffi cult to compare their performance. To overcome this issue some recent studies have proposed different magnet performance criteria and calculated the design performance. This paper aims to defi ne a new set of performance criteria taking into account the magnetic work and to perform an accurate comparison of some published designs of magnetic fi eld sources. First a brief review of previously proposed performance criteria is given and their limitations are discussed. Then a set of performance criteria is defi ned. Magnetic coeffi cient of performance is introduced. The set is completed by cooling power density, price per unit of cooling power and maximum magnetic torque or force (respectively for rotary or reciprocating designs). Different published structures are compared, from simple C-shaped magnets to complex fl ux concentration multi-pole machine, including Halbach assemblies. Finally these structures are modelled using commercial Finite Element software, namely FLUX®, and compared according to the set of performance criteria.
Domaines
Energie électrique
Origine : Fichiers produits par l'(les) auteur(s)
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