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Design improvements of a permanent magnet active magnetic refrigerator / D.S. Arnold 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. 99-105 Titre : Design improvements of a permanent magnet active magnetic refrigerator Titre original : Amélioration de la conception d'un réfrigérateur magnétique actif permanent Type de document : texte imprimé Auteurs : D.S. Arnold, Auteur ; A. Tura, Auteur ; Alex Ruebsaat-Trott, Auteur Année de publication : 2014 Article en page(s) : pp. 99-105 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Permanent  magnet  magnetic  refrigerator;  AMR  cycle Résumé : A second-generation room-temperature permanent magnet active magnetic regenerator test apparatus using Halbach arrays is described. The magnet arrays consist of three concentric cylinders. Each cylinder is constructed using 12 permanent magnet segments. The inner magnet array is stationary while the intermediate and outer arrays are designed to rotate in opposite directions so as to create a sinusoidal magnetic field waveform with a stationary field direction. The fluid flow system utilizes a novel check valve configuration so that fluid dead volumes are minimized. The system construction is modular to allow for quick replacement of material or system components. Fringing fields near the outer and inner diameters of the arrays are found to create large forces between arrays leading to large torques. Test results using 650 g of gadolinium spheres produce a no-load temperature span of 33 K at 0.8 Hz. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713002582 [article] Design improvements of a permanent magnet active magnetic refrigerator = Amélioration de la conception d'un réfrigérateur magnétique actif permanent [texte imprimé] / D.S. Arnold, Auteur ; A. Tura, Auteur ; Alex Ruebsaat-Trott, Auteur . - 2014 . - pp. 99-105. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 37 N° 1 (Janvier 2014) . - pp. 99-105 Mots-clés : Permanent  magnet  magnetic  refrigerator;  AMR  cycle Résumé : A second-generation room-temperature permanent magnet active magnetic regenerator test apparatus using Halbach arrays is described. The magnet arrays consist of three concentric cylinders. Each cylinder is constructed using 12 permanent magnet segments. The inner magnet array is stationary while the intermediate and outer arrays are designed to rotate in opposite directions so as to create a sinusoidal magnetic field waveform with a stationary field direction. The fluid flow system utilizes a novel check valve configuration so that fluid dead volumes are minimized. The system construction is modular to allow for quick replacement of material or system components. Fringing fields near the outer and inner diameters of the arrays are found to create large forces between arrays leading to large torques. Test results using 650 g of gadolinium spheres produce a no-load temperature span of 33 K at 0.8 Hz. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713002582

Performance modeling of AMR refrigerators / Thomas Burdyny 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. 51-62 Titre : Performance modeling of AMR refrigerators Titre original : Modélisation de la performance de réfrigérateurs à régénérateurs magnétiques actifs Type de document : texte imprimé Auteurs : Thomas Burdyny, Auteur ; Alex Ruebsaat-Trott, Auteur ; Andrew Rowe, Auteur Année de publication : 2014 Article en page(s) : pp. 51-62 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : AMR  cycle;  thermodynamics;  magnetocaloric  effect;  magnetic  refrigeration Résumé : A system modeling approach for predicting the performance of active magnetic regenerators using a one-phase approximation is presented. The approach is described for an arbitrary AMR device independent of the magnetic refrigerant, thermal losses or magnetic waveform. A general expression for magnetic work is derived which can be used for cycles where the low-field intensity is not zero. Additionally, a means of treating the varying magnetic field waveform as a single high and low field is described. The model is applied to a permanent magnet magnetic refrigerator using water–glycol as the heat transfer fluid. Simulated results are compared to experimental data which vary by heat load, frequency and utilization. A sensitivity analysis is performed using utilization, adiabatic temperature change, effective conductivity and particle size as independent variables. Comparisons to experimental data show that reducing the calculated magnetocaloric effect by 25% provides good agreement between simulations and experimental results. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713002119 [article] Performance modeling of AMR refrigerators = Modélisation de la performance de réfrigérateurs à régénérateurs magnétiques actifs [texte imprimé] / Thomas Burdyny, Auteur ; Alex Ruebsaat-Trott, Auteur ; Andrew Rowe, Auteur . - 2014 . - pp. 51-62. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 37 N° 1 (Janvier 2014) . - pp. 51-62 Mots-clés : AMR  cycle;  thermodynamics;  magnetocaloric  effect;  magnetic  refrigeration Résumé : A system modeling approach for predicting the performance of active magnetic regenerators using a one-phase approximation is presented. The approach is described for an arbitrary AMR device independent of the magnetic refrigerant, thermal losses or magnetic waveform. A general expression for magnetic work is derived which can be used for cycles where the low-field intensity is not zero. Additionally, a means of treating the varying magnetic field waveform as a single high and low field is described. The model is applied to a permanent magnet magnetic refrigerator using water–glycol as the heat transfer fluid. Simulated results are compared to experimental data which vary by heat load, frequency and utilization. A sensitivity analysis is performed using utilization, adiabatic temperature change, effective conductivity and particle size as independent variables. Comparisons to experimental data show that reducing the calculated magnetocaloric effect by 25% provides good agreement between simulations and experimental results. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713002119