Documents disponibles écrits par cet auteur

Design of a new magnetic refrigeration field source running with rotating bar-shaped magnets / H. R. E. H. Bouchekara in International journal of refrigeration, Vol. 35 N° 1 (Janvier 2012) 

Public ISBD [article]  in International journal of refrigeration > Vol. 35 N° 1 (Janvier 2012) . - pp. 115–121 Titre : Design of a new magnetic refrigeration field source running with rotating bar-shaped magnets Titre original : Conception d'une nouvelle source de champ pour les systèmes frigorifiques magnétiques constitués d'aimants tournants en forme de barres Type de document : texte imprimé Auteurs : H. R. E. H. Bouchekara, Auteur ; A. Kedous-Lebouc, Auteur ; J.-P. Yonnet, Auteur Année de publication : 2012 Article en page(s) : pp. 115–121 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Magnetic  refrigerator  Magnet  Design  Magnetic  field Résumé : Magnetic refrigeration (MR) based on the magnetocaloric effect (MCE) is a prime candidate for the next generation of cooling systems. The essential components of magnetic refrigeration are the magnetic field generator and the magnetocaloric material. Although, several permanent magnet systems (magnetic field sources) for MR have been developed, recent development in magnetic refrigeration technology has encouraged researchers all over the world to think about new and original systems. This paper aims to describe a new and original magnetic refrigeration system based on a simple principle of magnetism called the Halbach effect. The proposed system is running with rotating bar-shaped magnets. This structure provides the desired varying magnetic field to the magnetocaloric material. Several configurations for the proposed systems have been investigated and presented in this paper. The design and modeling have been accomplished by using the finite elements method. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711001952 [article] Design of a new magnetic refrigeration field source running with rotating bar-shaped magnets = Conception d'une nouvelle source de champ pour les systèmes frigorifiques magnétiques constitués d'aimants tournants en forme de barres [texte imprimé] / H. R. E. H. Bouchekara, Auteur ; A. Kedous-Lebouc, Auteur ; J.-P. Yonnet, Auteur . - 2012 . - pp. 115–121. Génie mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 35 N° 1 (Janvier 2012) . - pp. 115–121 Mots-clés : Magnetic  refrigerator  Magnet  Design  Magnetic  field Résumé : Magnetic refrigeration (MR) based on the magnetocaloric effect (MCE) is a prime candidate for the next generation of cooling systems. The essential components of magnetic refrigeration are the magnetic field generator and the magnetocaloric material. Although, several permanent magnet systems (magnetic field sources) for MR have been developed, recent development in magnetic refrigeration technology has encouraged researchers all over the world to think about new and original systems. This paper aims to describe a new and original magnetic refrigeration system based on a simple principle of magnetism called the Halbach effect. The proposed system is running with rotating bar-shaped magnets. This structure provides the desired varying magnetic field to the magnetocaloric material. Several configurations for the proposed systems have been investigated and presented in this paper. The design and modeling have been accomplished by using the finite elements method. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711001952

Multiobjective optimization of AMR systems / H. R. E. H. Bouchekara in International journal of refrigeration, Vol. 37 N° 1 (Janvier 2014) 

Public ISBD [article]  in International journal of refrigeration > Vol. 37 N° 1 (Janvier 2014) . - pp. 63-71 Titre : Multiobjective optimization of AMR systems Titre original : Optimisation multi-objectifs de systèmes de froid magnétique actif Type de document : texte imprimé Auteurs : H. R. E. H. Bouchekara, Auteur ; A. Kedous-Lebouc, Auteur ; J.-P. Yonnet, Auteur Année de publication : 2014 Article en page(s) : pp. 63-71 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : AMR;  optimal  design;  magnetic  refrigerator;  multiobjective  optimization Résumé : In this paper, computational algorithms of different multiobjective optimization techniques and their application for AMR systems are presented. In order to illustrate the effectiveness of the proposed methods, they have been demonstrated on a layered AMR bed, where four objective functions are considered, namely: the temperature span, the cooling energy, the number of cycles to reach steady state and the masse of the MCM. The weighted sum, weighted product, Keeney-Raiffa, distance to a reference goal and ε-constraint methods are described along with a comparative study of the results. The results from the multiobjective optimization methods are evaluated in terms of the supercriterion S and the Euclidean distance N. It is concluded that the results obtained using some methods, like the weighting methods, are properly balanced yielding the best compromise in the presence of conflicting objectives while some other methods, like the distance to a reference goal method and the ε-constraint method, allow to reach predefined goals or to respect additional constraints. Moreover, methods like distance to a reference one or the ε-constraint one need some expertise and insights. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713002430 [article] Multiobjective optimization of AMR systems = Optimisation multi-objectifs de systèmes de froid magnétique actif [texte imprimé] / H. R. E. H. Bouchekara, Auteur ; A. Kedous-Lebouc, Auteur ; J.-P. Yonnet, Auteur . - 2014 . - pp. 63-71. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 37 N° 1 (Janvier 2014) . - pp. 63-71 Mots-clés : AMR;  optimal  design;  magnetic  refrigerator;  multiobjective  optimization Résumé : In this paper, computational algorithms of different multiobjective optimization techniques and their application for AMR systems are presented. In order to illustrate the effectiveness of the proposed methods, they have been demonstrated on a layered AMR bed, where four objective functions are considered, namely: the temperature span, the cooling energy, the number of cycles to reach steady state and the masse of the MCM. The weighted sum, weighted product, Keeney-Raiffa, distance to a reference goal and ε-constraint methods are described along with a comparative study of the results. The results from the multiobjective optimization methods are evaluated in terms of the supercriterion S and the Euclidean distance N. It is concluded that the results obtained using some methods, like the weighting methods, are properly balanced yielding the best compromise in the presence of conflicting objectives while some other methods, like the distance to a reference goal method and the ε-constraint method, allow to reach predefined goals or to respect additional constraints. Moreover, methods like distance to a reference one or the ε-constraint one need some expertise and insights. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713002430