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Modeling of a two-stage magnetic refrigerator with wavy-structure gadolinium heat exchangers / D. Vuarnoz in International journal of refrigeration, Vol. 33 N° 4 (Juin 2010) 

Public ISBD [article]  in International journal of refrigeration > Vol. 33 N° 4 (Juin 2010) . - pp. 745-752 Titre : Modeling of a two-stage magnetic refrigerator with wavy-structure gadolinium heat exchangers Titre original : Modélisationon d’un réfrigérateur magnétique biétagé muni d’échangeurs de chaleur ondulés en gadolinium Type de document : texte imprimé Auteurs : D. Vuarnoz, Auteur ; A. Kitanovski, Auteur ; C. Gonin, Auteur Année de publication : 2010 Article en page(s) : pp. 745-752 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Magnetic  refrigerator  Two-stage  system  Modelling  Simulation  Performance-COP Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : In a rotary magnetic refrigerator a porous ring is turning in and out of a magnetic field region. The adiabatic demagnetization of the magnetocaloric material produces the “cold energy”. This is described by a discontinuous temperature decrease, known as adiabatic temperature difference. For such a machine a physical model has been developed, based on a mapping of the magneto-thermodynamic problem. In this model, in a basic centre cell, two coupled linear partial differential equations are solved, which have been programmed in the Modelica language. The operation of a magnetic refrigerator is simulated with numerous parameters. Steady state solutions are obtained to verify the coefficient of performance under stable operation conditions. Optimal running conditions – defined by maximum values of the coefficient of performance – are not presented in this article, but can now easily be obtained with the existing program. A simple regulation strategy is proposed and implemented into the program. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700709003119 [article] Modeling of a two-stage magnetic refrigerator with wavy-structure gadolinium heat exchangers = Modélisationon d’un réfrigérateur magnétique biétagé muni d’échangeurs de chaleur ondulés en gadolinium [texte imprimé] / D. Vuarnoz, Auteur ; A. Kitanovski, Auteur ; C. Gonin, Auteur . - 2010 . - pp. 745-752. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 4 (Juin 2010) . - pp. 745-752 Mots-clés : Magnetic  refrigerator  Two-stage  system  Modelling  Simulation  Performance-COP Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : In a rotary magnetic refrigerator a porous ring is turning in and out of a magnetic field region. The adiabatic demagnetization of the magnetocaloric material produces the “cold energy”. This is described by a discontinuous temperature decrease, known as adiabatic temperature difference. For such a machine a physical model has been developed, based on a mapping of the magneto-thermodynamic problem. In this model, in a basic centre cell, two coupled linear partial differential equations are solved, which have been programmed in the Modelica language. The operation of a magnetic refrigerator is simulated with numerous parameters. Steady state solutions are obtained to verify the coefficient of performance under stable operation conditions. Optimal running conditions – defined by maximum values of the coefficient of performance – are not presented in this article, but can now easily be obtained with the existing program. A simple regulation strategy is proposed and implemented into the program. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700709003119