Documents disponibles écrits par cet auteur

Improvement and application of a numerical model for optimizing the design of magnetic refrigerators / M. Risser in International journal of refrigeration, Vol. 36 N° 3 (Mai 2013) 

Public ISBD [article]  in International journal of refrigeration > Vol. 36 N° 3 (Mai 2013) . - pp. 950–957 Titre : Improvement and application of a numerical model for optimizing the design of magnetic refrigerators Titre original : Amélioration et application d'un modèle numérique pour l'optimisation de la conception des réfrigérateurs magnétiques Type de document : texte imprimé Auteurs : M. Risser, Auteur ; C. Vasile, Auteur ; C. Muller, Auteur Année de publication : 2013 Article en page(s) : pp. 950–957 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Magnetocaloric  refrigerator;  Modelling;  Thermodynamic  cycle;  Exergy;  Gadolinium Résumé : Magnetocaloric systems are interesting from the point of view of energy efficiency and could be environment-friendly products. Numerous prototypes have demonstrated the feasibility of such systems for applications around room temperature, but there is still room for improvement. The research of an optimal configuration only by an experimental approach is a complex and difficult task due to numerous building parameters and driving parameters. Therefore we propose here a methodology based on a numerical approach. A numerical model calibrated with respect to experimental tests is used to make a parametric analysis of a magnetocaloric system. The design of the system is made according to given functional specifications, targeting different design strategies such as the power density, the energy efficiency, the maximizing of the temperature span, etc. This work is a step forward to the increase of the efficiency in the design of our future systems. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712002721 [article] Improvement and application of a numerical model for optimizing the design of magnetic refrigerators = Amélioration et application d'un modèle numérique pour l'optimisation de la conception des réfrigérateurs magnétiques [texte imprimé] / M. Risser, Auteur ; C. Vasile, Auteur ; C. Muller, Auteur . - 2013 . - pp. 950–957. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 3 (Mai 2013) . - pp. 950–957 Mots-clés : Magnetocaloric  refrigerator;  Modelling;  Thermodynamic  cycle;  Exergy;  Gadolinium Résumé : Magnetocaloric systems are interesting from the point of view of energy efficiency and could be environment-friendly products. Numerous prototypes have demonstrated the feasibility of such systems for applications around room temperature, but there is still room for improvement. The research of an optimal configuration only by an experimental approach is a complex and difficult task due to numerous building parameters and driving parameters. Therefore we propose here a methodology based on a numerical approach. A numerical model calibrated with respect to experimental tests is used to make a parametric analysis of a magnetocaloric system. The design of the system is made according to given functional specifications, targeting different design strategies such as the power density, the energy efficiency, the maximizing of the temperature span, etc. This work is a step forward to the increase of the efficiency in the design of our future systems. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712002721

Magnetic heat pumps / J. M. Gatti 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. 165–175 Titre : Magnetic heat pumps : configurable hydraulic distribution for a magnetic cooling system=Distribution hydraulique configurable pour un système de froid magnétique Titre original : Pompe à chaleur magnétiques Type de document : texte imprimé Auteurs : J. M. Gatti, Auteur ; C. Muller, Auteur ; C. Vasile, Auteur Année de publication : 2014 Article en page(s) : pp. 165–175 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Magnetocaloric  heat  pump;  hydraulic  distribution;  linear  system;  rotary  system;  AMRR  cycle;  dynamic  seal Résumé : Magnetic cooling technology has experienced significant developments over the last five years. Most of the magneto-caloric prototypes use magneto-caloric alloys subject to variable magnetic field and coolant flow synchronized with the magnetisation/demagnetisation cycles. Hydraulic flow regulation has a major impact on the AMRR cycle and on the performance of the magnetic heat pump. This paper discloses a hydraulic solution implemented in a two stage linear prototype, where the volume, the flow rate and the coolant velocity can be controlled. The dynamic sealing of the system is also described, as well as the performance of a two stage prototype integrating this hydraulic distribution solution to this first generation solution. A brief description of a third generation ‘rotative’ architecture is provided, with results obtained just after the last Thermag V conference. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713002399 [article] Magnetic heat pumps = Pompe à chaleur magnétiques : configurable hydraulic distribution for a magnetic cooling system=Distribution hydraulique configurable pour un système de froid magnétique [texte imprimé] / J. M. Gatti, Auteur ; C. Muller, Auteur ; C. Vasile, Auteur . - 2014 . - pp. 165–175. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 37 N° 1 (Janvier 2014) . - pp. 165–175 Mots-clés : Magnetocaloric  heat  pump;  hydraulic  distribution;  linear  system;  rotary  system;  AMRR  cycle;  dynamic  seal Résumé : Magnetic cooling technology has experienced significant developments over the last five years. Most of the magneto-caloric prototypes use magneto-caloric alloys subject to variable magnetic field and coolant flow synchronized with the magnetisation/demagnetisation cycles. Hydraulic flow regulation has a major impact on the AMRR cycle and on the performance of the magnetic heat pump. This paper discloses a hydraulic solution implemented in a two stage linear prototype, where the volume, the flow rate and the coolant velocity can be controlled. The dynamic sealing of the system is also described, as well as the performance of a two stage prototype integrating this hydraulic distribution solution to this first generation solution. A brief description of a third generation ‘rotative’ architecture is provided, with results obtained just after the last Thermag V conference. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713002399

Numerical simulation of magnetocaloric system behaviour for an industrial application / M. Risser in International journal of refrigeration, Vol. 33 N° 5 (Août 2010) 

Public ISBD [article]  in International journal of refrigeration > Vol. 33 N° 5 (Août 2010) . - pp. 973-981 Titre : Numerical simulation of magnetocaloric system behaviour for an industrial application Titre original : Simulation numérique du comportement d’un système magnétocalorique dans une application industrielle Type de document : texte imprimé Auteurs : M. Risser, Auteur ; C. Vasile, Auteur ; T. Engel, Auteur Année de publication : 2010 Article en page(s) : pp. 973-981 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Magnetic  refrigerator  Industrial  application  Modelling  Simulation  Heat  transfer  Energy  Flow  Fluid Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This paper presents a numerical model conceived for a multi-physics evaluation of a magnetic refrigeration system. The model takes into account the variable magnetic field, the characteristics of the magnetocaloric materials (MCM) as well as the efficiency of the fluid flow heat transfer between the hot and the cold sources via the MCM. This model allows us to optimize these elements and to determine their impact on the overall performance of a magnetocaloric device. We present here a finite-difference model of AMRR cycles for a sub-unit of MCM crossed by micro-channels of fluid connected to cold and hot regenerative receivers. Thus, the calculation of the output parameters such as the temperature span, and thermal power passing from the cold receiver to the hot receiver has been performed. The influence of the geometry of the MCM and the fluid flow were investigated over the working domain highlighting the current technological achievements and indicating possible improvements. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S014070071000040X [article] Numerical simulation of magnetocaloric system behaviour for an industrial application = Simulation numérique du comportement d’un système magnétocalorique dans une application industrielle [texte imprimé] / M. Risser, Auteur ; C. Vasile, Auteur ; T. Engel, Auteur . - 2010 . - pp. 973-981. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 5 (Août 2010) . - pp. 973-981 Mots-clés : Magnetic  refrigerator  Industrial  application  Modelling  Simulation  Heat  transfer  Energy  Flow  Fluid Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This paper presents a numerical model conceived for a multi-physics evaluation of a magnetic refrigeration system. The model takes into account the variable magnetic field, the characteristics of the magnetocaloric materials (MCM) as well as the efficiency of the fluid flow heat transfer between the hot and the cold sources via the MCM. This model allows us to optimize these elements and to determine their impact on the overall performance of a magnetocaloric device. We present here a finite-difference model of AMRR cycles for a sub-unit of MCM crossed by micro-channels of fluid connected to cold and hot regenerative receivers. Thus, the calculation of the output parameters such as the temperature span, and thermal power passing from the cold receiver to the hot receiver has been performed. The influence of the geometry of the MCM and the fluid flow were investigated over the working domain highlighting the current technological achievements and indicating possible improvements. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S014070071000040X

Sizing of a reversible magnetic heat pump for the automotive industry / B. Torregrosa-Jaime 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. 156–164 Titre : Sizing of a reversible magnetic heat pump for the automotive industry Titre original : Dimensionnement d'une pompe à chaleur magnétique réversible pour l'industrie automobile Type de document : texte imprimé Auteurs : B. Torregrosa-Jaime, Auteur ; J. M. Corberán, Auteur ; C. Vasile, Auteur Année de publication : 2014 Article en page(s) : pp. 156–164 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Magnetic  refrigerator;  heat  pump;  automobile;  air  conditioning;  modelling Résumé : This paper focuses on the design of an innovative air-conditioning system, namely a magnetocaloric air-conditioner for an electric minibus. An integrated design of the complete system is necessary, as the hot and cold side of the regenerator will work under dynamic conditions which depend on the instantaneous thermal load in the cabin. In order to assist the design of the system, a dynamic model has been developed for the cabin, the hydraulic loops and heat exchangers, and the magnetocaloric unit. This paper presents (i) a description of the dynamic models, (ii) an analysis of the operating conditions of the magnetocaloric unit and (iii) a discussion on the design of the magnetocaloric air-conditioner. The results show that the electric minibus requests 1.60 kW of cooling power over a span of 37 K in cooling mode, and 3.39 kW of heating power over a span of 40 K. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713001771 [article] Sizing of a reversible magnetic heat pump for the automotive industry = Dimensionnement d'une pompe à chaleur magnétique réversible pour l'industrie automobile [texte imprimé] / B. Torregrosa-Jaime, Auteur ; J. M. Corberán, Auteur ; C. Vasile, Auteur . - 2014 . - pp. 156–164. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 37 N° 1 (Janvier 2014) . - pp. 156–164 Mots-clés : Magnetic  refrigerator;  heat  pump;  automobile;  air  conditioning;  modelling Résumé : This paper focuses on the design of an innovative air-conditioning system, namely a magnetocaloric air-conditioner for an electric minibus. An integrated design of the complete system is necessary, as the hot and cold side of the regenerator will work under dynamic conditions which depend on the instantaneous thermal load in the cabin. In order to assist the design of the system, a dynamic model has been developed for the cabin, the hydraulic loops and heat exchangers, and the magnetocaloric unit. This paper presents (i) a description of the dynamic models, (ii) an analysis of the operating conditions of the magnetocaloric unit and (iii) a discussion on the design of the magnetocaloric air-conditioner. The results show that the electric minibus requests 1.60 kW of cooling power over a span of 37 K in cooling mode, and 3.39 kW of heating power over a span of 40 K. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713001771