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Auteur Jaka Tušek |
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Titre : Development of a rotary magnetic refrigerator Titre original : Développement d’un réfrigérateur magnétique rotati Type de document : texte imprimé Auteurs : Jaka Tušek, Auteur ; Samo Zupan, Auteur ; Alen Šarlah, Auteur Année de publication : 2011 Article en page(s) : pp. 294-300 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Magnetic refrigerator Design Construction Magnet Gadolinium Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A team of researchers have developed and built a prototype of a rotary magnetic refrigerator (MR). The principle of the operation of the presented magnetic refrigerator is based on the rotary movement of active magnetic regenerators (AMRs) with a magnetocaloric material and on the magnetic field generated by permanent magnets Nd–Fe–B. The first part of the paper presents the development and analysis of the structure for generating the magnetic field and the basic operational principle of the magnetic refrigerator concerned, and the second part gives a description of the development process for certain key elements of the complete magnetic refrigeration system. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700709002503
in International journal of refrigeration > Vol. 33 N° 2 (Mars 2010) . - pp. 294-300[article] Development of a rotary magnetic refrigerator = Développement d’un réfrigérateur magnétique rotati [texte imprimé] / Jaka Tušek, Auteur ; Samo Zupan, Auteur ; Alen Šarlah, Auteur . - 2011 . - pp. 294-300.
Génie Mécanique
Langues : Anglais (eng)
in International journal of refrigeration > Vol. 33 N° 2 (Mars 2010) . - pp. 294-300
Mots-clés : Magnetic refrigerator Design Construction Magnet Gadolinium Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A team of researchers have developed and built a prototype of a rotary magnetic refrigerator (MR). The principle of the operation of the presented magnetic refrigerator is based on the rotary movement of active magnetic regenerators (AMRs) with a magnetocaloric material and on the magnetic field generated by permanent magnets Nd–Fe–B. The first part of the paper presents the development and analysis of the structure for generating the magnetic field and the basic operational principle of the magnetic refrigerator concerned, and the second part gives a description of the development process for certain key elements of the complete magnetic refrigeration system. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700709002503 Exemplaires
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Titre : Electrocaloric vs. magnetocaloric energy conversion Titre original : Comparaisons des conversions d'énergie électrocalorique et magnétocalorique Type de document : texte imprimé Auteurs : M. Ožbolt, Auteur ; A. Kitanovski, Auteur ; Jaka Tušek, Auteur Année de publication : 2014 Article en page(s) : pp. 16-27 Note générale : refrigeration Langues : Anglais (eng) Mots-clés : Electrocaloric effect magnetocaloric magnetic refrigeration energy conversion refrigeration Résumé : Currently, one of the most interesting alternatives to conventional compressor refrigeration is magnetic refrigeration. However, despite its great potential, some important obstacles, relating mostly to the relatively low power density and the related high costs, must be overcome. Another alternative, which also shows great potential, is electrocaloric refrigeration. Until recently, electrocaloric materials were not so common; however, a number of different electrocaloric materials exist today. Like magnetocalorics, these can be used in the form of a regenerator in order to increase the temperature span. Based on a previously developed numerical model, we have made a comparison between electrocaloric and magnetocaloric regenerators. The results suggest that electrocaloric energy conversion represents a serious alternative, not only to compressor-based technologies, but also to magnetocalorics. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713001655
in International journal of refrigeration > Vol. 37 N° 1 (Janvier 2014) . - pp. 16-27[article] Electrocaloric vs. magnetocaloric energy conversion = Comparaisons des conversions d'énergie électrocalorique et magnétocalorique [texte imprimé] / M. Ožbolt, Auteur ; A. Kitanovski, Auteur ; Jaka Tušek, Auteur . - 2014 . - pp. 16-27.
refrigeration
Langues : Anglais (eng)
in International journal of refrigeration > Vol. 37 N° 1 (Janvier 2014) . - pp. 16-27
Mots-clés : Electrocaloric effect magnetocaloric magnetic refrigeration energy conversion refrigeration Résumé : Currently, one of the most interesting alternatives to conventional compressor refrigeration is magnetic refrigeration. However, despite its great potential, some important obstacles, relating mostly to the relatively low power density and the related high costs, must be overcome. Another alternative, which also shows great potential, is electrocaloric refrigeration. Until recently, electrocaloric materials were not so common; however, a number of different electrocaloric materials exist today. Like magnetocalorics, these can be used in the form of a regenerator in order to increase the temperature span. Based on a previously developed numerical model, we have made a comparison between electrocaloric and magnetocaloric regenerators. The results suggest that electrocaloric energy conversion represents a serious alternative, not only to compressor-based technologies, but also to magnetocalorics. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713001655 Exemplaires
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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
in International journal of refrigeration > Vol. 37 N° 1 (Janvier 2014) . - pp. 117-126[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 Exemplaires
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Titre : New thermodynamic cycles for magnetic refrigeration Titre original : Nouveaux cycles thermodynamiques pour le froid magnétique Type de document : texte imprimé Auteurs : A. Kitanovski, Auteur ; U. Plaznik, Auteur ; Jaka Tušek, Auteur Année de publication : 2014 Article en page(s) : pp. 28-35 Note générale : refrigeration Langues : Anglais (eng) Mots-clés : Magnetic refrigeration active magnetic regenerator thermodynamic cycle energy efficiency heat transfe Résumé : Most of the existing prototype devices for magnetic refrigeration are based on a thermodynamic cycle with an active magnetic regenerator (AMR) that operates as a Brayton-type regenerative magnetic refrigeration cycle. However, there are several other cycles that may potentially influence not only the efficiency, but also the cost, compactness and simplicity of magnetocaloric devices. In this article we discuss the possibility of introducing new thermodynamic cycles. This is supported by information about, and a comparison of, the corresponding magnetic field sources. We present the results of numerical analyses and compare the characteristics of different thermodynamic cycles under different operating conditions and for different magnetic field intensities. Guidelines for future work on new magnetic thermodynamic cycles are presented. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713001412
in International journal of refrigeration > Vol. 37 N° 1 (Janvier 2014) . - pp. 28-35[article] New thermodynamic cycles for magnetic refrigeration = Nouveaux cycles thermodynamiques pour le froid magnétique [texte imprimé] / A. Kitanovski, Auteur ; U. Plaznik, Auteur ; Jaka Tušek, Auteur . - 2014 . - pp. 28-35.
refrigeration
Langues : Anglais (eng)
in International journal of refrigeration > Vol. 37 N° 1 (Janvier 2014) . - pp. 28-35
Mots-clés : Magnetic refrigeration active magnetic regenerator thermodynamic cycle energy efficiency heat transfe Résumé : Most of the existing prototype devices for magnetic refrigeration are based on a thermodynamic cycle with an active magnetic regenerator (AMR) that operates as a Brayton-type regenerative magnetic refrigeration cycle. However, there are several other cycles that may potentially influence not only the efficiency, but also the cost, compactness and simplicity of magnetocaloric devices. In this article we discuss the possibility of introducing new thermodynamic cycles. This is supported by information about, and a comparison of, the corresponding magnetic field sources. We present the results of numerical analyses and compare the characteristics of different thermodynamic cycles under different operating conditions and for different magnetic field intensities. Guidelines for future work on new magnetic thermodynamic cycles are presented. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713001412 Exemplaires
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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
in International journal of refrigeration > Vol. 37 N° 1 (Janvier 2014) . - pp. 185–193[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 Exemplaires
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