Documents disponibles écrits par cet auteur

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

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