Documents disponibles écrits par cet auteur

Experimental comparison of multi-layered La–Fe–Co–Si and single-layered Gd active magnetic regenerators for use in a room-temperature magnetic refrigerator / Jaka Tušek 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. 117-126 Titre : Experimental comparison of multi-layered La–Fe–Co–Si and single-layered Gd active magnetic regenerators for use in a room-temperature magnetic refrigerator Titre original : Comparaison expérimentale de réfrigérateurs au La-Fe-Co-Si à couches multiples et au Gd à couches simples pour l'utilisation dans un réfrigérateur magnétique à température ambiante Type de document : texte imprimé Auteurs : Jaka Tušek, Auteur ; Andrej Kitanovski, Auteur ; Urban Tomc, Auteur Année de publication : 2014 Article en page(s) : pp. 117-126 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Magnetic  refrigeration;  active  magnetic  regenerator;  magnetocaloric  materials;  experiments;  heat  transfer Résumé : We present experimental comparison of different parallel-plate active magnetic regenerators (AMRs) with two different groups of magnetocaloric materials. First, a gadolinium-based single-layered AMR was tested and analysed under different operating conditions. In the next step, three different multi-layered AMRs with different compositions and different Curie temperatures made from LaFe13 − x − yCoxSiy materials were constructed and tested. Seven-, four- and two-layered La-based AMRs were evaluated. The measurements were performed with respect to the maximum measured temperature span under different operating conditions and the cooling load under different temperature spans. In order to find the optimum operating temperature range the AMRs were further compared for different hot-side temperatures. The Gd-based AMR produced a larger temperature span, especially at higher operating frequencies and higher mass-flow rates. Among the multi-layered La–Fe–Co–Si AMRs, the seven- and four-layered AMRs showed very similar characteristics, while the two-layered AMR was much poorer. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713002363 [article] Experimental comparison of multi-layered La–Fe–Co–Si and single-layered Gd active magnetic regenerators for use in a room-temperature magnetic refrigerator = Comparaison expérimentale de réfrigérateurs au La-Fe-Co-Si à couches multiples et au Gd à couches simples pour l'utilisation dans un réfrigérateur magnétique à température ambiante [texte imprimé] / Jaka Tušek, Auteur ; Andrej Kitanovski, Auteur ; Urban Tomc, Auteur . - 2014 . - pp. 117-126. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 37 N° 1 (Janvier 2014) . - pp. 117-126 Mots-clés : Magnetic  refrigeration;  active  magnetic  regenerator;  magnetocaloric  materials;  experiments;  heat  transfer Résumé : We present experimental comparison of different parallel-plate active magnetic regenerators (AMRs) with two different groups of magnetocaloric materials. First, a gadolinium-based single-layered AMR was tested and analysed under different operating conditions. In the next step, three different multi-layered AMRs with different compositions and different Curie temperatures made from LaFe13 − x − yCoxSiy materials were constructed and tested. Seven-, four- and two-layered La-based AMRs were evaluated. The measurements were performed with respect to the maximum measured temperature span under different operating conditions and the cooling load under different temperature spans. In order to find the optimum operating temperature range the AMRs were further compared for different hot-side temperatures. The Gd-based AMR produced a larger temperature span, especially at higher operating frequencies and higher mass-flow rates. Among the multi-layered La–Fe–Co–Si AMRs, the seven- and four-layered AMRs showed very similar characteristics, while the two-layered AMR was much poorer. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713002363

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

A numerical comparison of a parallel-plate AMR and a magnetocaloric device with embodied micro thermoelectric thermal diodes / Urban Tomc 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. 185–193 Titre : A numerical comparison of a parallel-plate AMR and a magnetocaloric device with embodied micro thermoelectric thermal diodes Titre original : Une comparaison numérique de plaques de régénérateurs magnétiques actifs (AMR) paralléles et d'un appareil magnétocalorique avec à micro-diodes thermiques et thermoélectriques incorporées Type de document : texte imprimé Auteurs : Urban Tomc, Auteur ; Jaka Tušek, Auteur ; Andrej Kitanovski, Auteur Année de publication : 2014 Article en page(s) : pp. 185–193 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Magnetic  refrigeration;  active  magnetic  regenerator;  thermal  diodes;  effet  Peltier;  heat  transfer Résumé : This article introduces a novel heat-transfer mechanism for magnetocaloric energy conversion based on the introduction of thermoelectric thermal diodes. These can provide the very rapid transport of heat from/to the magnetocaloric material. For the purposes of the study, a new mathematical-numerical model has been developed. The model serves for dynamic heat-transfer simulations and an estimation of the cooling characteristics of magnetocaloric devices, which apply thermal diodes. Micro Peltier elements were considered as the thermal diodes. A theoretical analysis was performed in order to compare the performance of a parallel-plate active magnetic regenerator with a magnetocaloric device that uses thermal diodes. The results show the great potential for magnetocaloric devices with thermal diodes, especially in terms of an increased operating frequency and specific cooling powers. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713001679 [article] A numerical comparison of a parallel-plate AMR and a magnetocaloric device with embodied micro thermoelectric thermal diodes = Une comparaison numérique de plaques de régénérateurs magnétiques actifs (AMR) paralléles et d'un appareil magnétocalorique avec à micro-diodes thermiques et thermoélectriques incorporées [texte imprimé] / Urban Tomc, Auteur ; Jaka Tušek, Auteur ; Andrej Kitanovski, Auteur . - 2014 . - pp. 185–193. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 37 N° 1 (Janvier 2014) . - pp. 185–193 Mots-clés : Magnetic  refrigeration;  active  magnetic  regenerator;  thermal  diodes;  effet  Peltier;  heat  transfer Résumé : This article introduces a novel heat-transfer mechanism for magnetocaloric energy conversion based on the introduction of thermoelectric thermal diodes. These can provide the very rapid transport of heat from/to the magnetocaloric material. For the purposes of the study, a new mathematical-numerical model has been developed. The model serves for dynamic heat-transfer simulations and an estimation of the cooling characteristics of magnetocaloric devices, which apply thermal diodes. Micro Peltier elements were considered as the thermal diodes. A theoretical analysis was performed in order to compare the performance of a parallel-plate active magnetic regenerator with a magnetocaloric device that uses thermal diodes. The results show the great potential for magnetocaloric devices with thermal diodes, especially in terms of an increased operating frequency and specific cooling powers. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713001679