Documents disponibles écrits par cet auteur

High-frequency magnetocaloric modules with heat gates operating with the Peltier effect / Peter W. Egolf 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. 176-184 Titre : High-frequency magnetocaloric modules with heat gates operating with the Peltier effect Titre original : Modules magnétocaloriques à haute fréquence munis d'interrupteurs thermiques fonctionnant grâce à l'effet Peltier Type de document : texte imprimé Auteurs : Peter W. Egolf, Auteur ; L. Gravier, Auteur ; T. Francfort, Auteur Année de publication : 2014 Article en page(s) : pp. 176-184 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Magnetocalorics;  magnetic  refrigeration;  thermal  switches;  Peltier  elements;  seebeck  effect;  high-frequency Résumé : 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. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713002624 [article] High-frequency magnetocaloric modules with heat gates operating with the Peltier effect = Modules magnétocaloriques à haute fréquence munis d'interrupteurs thermiques fonctionnant grâce à l'effet Peltier [texte imprimé] / Peter W. Egolf, Auteur ; L. Gravier, Auteur ; T. Francfort, Auteur . - 2014 . - pp. 176-184. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 37 N° 1 (Janvier 2014) . - pp. 176-184 Mots-clés : Magnetocalorics;  magnetic  refrigeration;  thermal  switches;  Peltier  elements;  seebeck  effect;  high-frequency Résumé : 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. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713002624

Innovative ideas for future research on magnetocaloric technologies / Andrej Kitanovski in International journal of refrigeration, Vol. 33 N° 3 (Mai 2010) 

Public ISBD [article]  in International journal of refrigeration > Vol. 33 N° 3 (Mai 2010) . - pp. 449-464 Titre : Innovative ideas for future research on magnetocaloric technologies Titre original : Concepts innovants pour les recherches futures sur les technologies magnétocaloriques Type de document : texte imprimé Auteurs : Andrej Kitanovski, Auteur ; Peter W. Egolf, Auteur Année de publication : 2010 Article en page(s) : pp. 449-464 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Magnetocaloric  Heat  pump-magnetic  refrigerator  Review  Research  Development  Technology-material  Energy  conversion Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Magnetic heating, refrigeration and energy conversion have caused awareness of being promising future environmentally benign technologies with much potential to enter some existing markets. An increased research activity is observed, which to the end of the year 2010 lead to approximately forty-two prototypes. As most of these machines contain solid linear moving or rotating beds – consisting of magnetocaloric material - through static magnetic fields or moving magnets, which sweep a magnetic field over a static bed, all researchers face more or less the same problems. These concern materials, fluids, design and the operation characteristics. In this article innovative new system ideas are presented, which may have the potential to overcome existing barriers. The article is a proposal to the research community in the field of magnetocaloric technologies for future R&D activities. Taking into account all the limits and problems that researchers are facing at present, the best chance to bring magnetocaloric technologies to the market is to try some substantially new approaches that go beyond the present state-of-the-art. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700709002527 [article] Innovative ideas for future research on magnetocaloric technologies = Concepts innovants pour les recherches futures sur les technologies magnétocaloriques [texte imprimé] / Andrej Kitanovski, Auteur ; Peter W. Egolf, Auteur . - 2010 . - pp. 449-464. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 3 (Mai 2010) . - pp. 449-464 Mots-clés : Magnetocaloric  Heat  pump-magnetic  refrigerator  Review  Research  Development  Technology-material  Energy  conversion Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Magnetic heating, refrigeration and energy conversion have caused awareness of being promising future environmentally benign technologies with much potential to enter some existing markets. An increased research activity is observed, which to the end of the year 2010 lead to approximately forty-two prototypes. As most of these machines contain solid linear moving or rotating beds – consisting of magnetocaloric material - through static magnetic fields or moving magnets, which sweep a magnetic field over a static bed, all researchers face more or less the same problems. These concern materials, fluids, design and the operation characteristics. In this article innovative new system ideas are presented, which may have the potential to overcome existing barriers. The article is a proposal to the research community in the field of magnetocaloric technologies for future R&D activities. Taking into account all the limits and problems that researchers are facing at present, the best chance to bring magnetocaloric technologies to the market is to try some substantially new approaches that go beyond the present state-of-the-art. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700709002527

Lowering and phase shifting of temperature profiles with phase change materials in Minergie™ houses / C. Muriset in International journal of refrigeration, Vol. 33 N° 8 (Décembre 2010) 

Public ISBD [article]  in International journal of refrigeration > Vol. 33 N° 8 (Décembre 2010) . - pp. 1670-1675 Titre : Lowering and phase shifting of temperature profiles with phase change materials in Minergie™ houses Titre original : Augmentation et diminution des profils de température à l'aide de matériaux à changement de phase dans les maisons Minergie™ Type de document : texte imprimé Auteurs : C. Muriset, Auteur ; Peter W. Egolf, Auteur ; D. Vuarnoz, Auteur Année de publication : 2011 Article en page(s) : pp. 1670-1675 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Material  Phase-change  Thermal  storage  Model  Numerical  simulation Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A PCM dephaser and storage module based on a melting/freezing model was built and implemented into the Dymola-Modelica software. This software offers thermal libraries with standard components as tubes, pumps, heat exchangers, etc. Main simulation results of interest include the phase shift (delay time) caused by cylinders filled with a PCM and positioned in the storage/dephasing device. Furthermore, an entire Minergie™ house was modelled by a rather simple (economic in terms of CPU time), but still very effective thermal model. This house is connected to a suitable ventilation system chosen from a list of six different types. Therefore, also by graphical means on an interface, it is possible to create a Minergie™ house with an integrated thermal temperature lowering/phase shifting and heat recovery device. Temperature differences between a Minergie™ house connected to a storage device and a house without such a device are studied. Such systems are planned to be mainly used for hybrid cooling of Swiss Minergie™ houses in summer time. In a multi-functional application, they could also be applied in winter for a heating support. Numerous simulation results are discussed and optimal solutions are presented. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710002306 [article] Lowering and phase shifting of temperature profiles with phase change materials in Minergie™ houses = Augmentation et diminution des profils de température à l'aide de matériaux à changement de phase dans les maisons Minergie™ [texte imprimé] / C. Muriset, Auteur ; Peter W. Egolf, Auteur ; D. Vuarnoz, Auteur . - 2011 . - pp. 1670-1675. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 8 (Décembre 2010) . - pp. 1670-1675 Mots-clés : Material  Phase-change  Thermal  storage  Model  Numerical  simulation Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A PCM dephaser and storage module based on a melting/freezing model was built and implemented into the Dymola-Modelica software. This software offers thermal libraries with standard components as tubes, pumps, heat exchangers, etc. Main simulation results of interest include the phase shift (delay time) caused by cylinders filled with a PCM and positioned in the storage/dephasing device. Furthermore, an entire Minergie™ house was modelled by a rather simple (economic in terms of CPU time), but still very effective thermal model. This house is connected to a suitable ventilation system chosen from a list of six different types. Therefore, also by graphical means on an interface, it is possible to create a Minergie™ house with an integrated thermal temperature lowering/phase shifting and heat recovery device. Temperature differences between a Minergie™ house connected to a storage device and a house without such a device are studied. Such systems are planned to be mainly used for hybrid cooling of Swiss Minergie™ houses in summer time. In a multi-functional application, they could also be applied in winter for a heating support. Numerous simulation results are discussed and optimal solutions are presented. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710002306

A review of magnetic refrigerator and heat pump prototypes built before the year 2010 / Bingfeng Yu in International journal of refrigeration, Vol. 33 N° 6 (Septembre 2010) 

Public ISBD [article]  in International journal of refrigeration > Vol. 33 N° 6 (Septembre 2010) . - pp. 1029-1060 Titre : A review of magnetic refrigerator and heat pump prototypes built before the year 2010 Titre original : Prototypes de réfrigérateurs et de pompes à chaleur magnétiques réalisés avant l'an 2010 Type de document : texte imprimé Auteurs : Bingfeng Yu, Auteur ; Liu, Min, Auteur ; Peter W. Egolf, Auteur Année de publication : 2010 Article en page(s) : pp. 1029-1060 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Magnetic  refrigerator  Heat  pump  Review  History Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Magnetic refrigeration, heating and power conversion technologies are interesting alternatives to the conventional refrigeration, heat pumping and different conventional energy conversion technologies. At present they all show a realistic potential to enter conventional markets, respectively to be applied in a few years. In this review paper, mainly magnetic refrigeration and magnetic heating are addressed and from these two technologies the main part is dedicated to magnetic refrigeration at room temperature. This article covers the demand of giving a complete list and description of existing magnetic heating and cooling prototypes up to the year 2010. Forty-one machines, their components and operation principles are presented in detail. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000721 [article] A review of magnetic refrigerator and heat pump prototypes built before the year 2010 = Prototypes de réfrigérateurs et de pompes à chaleur magnétiques réalisés avant l'an 2010 [texte imprimé] / Bingfeng Yu, Auteur ; Liu, Min, Auteur ; Peter W. Egolf, Auteur . - 2010 . - pp. 1029-1060. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 6 (Septembre 2010) . - pp. 1029-1060 Mots-clés : Magnetic  refrigerator  Heat  pump  Review  History Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Magnetic refrigeration, heating and power conversion technologies are interesting alternatives to the conventional refrigeration, heat pumping and different conventional energy conversion technologies. At present they all show a realistic potential to enter conventional markets, respectively to be applied in a few years. In this review paper, mainly magnetic refrigeration and magnetic heating are addressed and from these two technologies the main part is dedicated to magnetic refrigeration at room temperature. This article covers the demand of giving a complete list and description of existing magnetic heating and cooling prototypes up to the year 2010. Forty-one machines, their components and operation principles are presented in detail. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000721