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Impact of the initial field on the thermodynamic performance of room-temperature magnetic refrigeration cycle / Gildas Diguet in International journal of refrigeration, Vol. 36 N° 8 (Décembre 2013) 

Public ISBD [article]  in International journal of refrigeration > Vol. 36 N° 8 (Décembre 2013) . - pp. 2395–2402 Titre : Impact of the initial field on the thermodynamic performance of room-temperature magnetic refrigeration cycle Titre original : Impact du champ initial sur le rendement thermodynamique du cycle frigorifique magnétique à température ambiante Type de document : texte imprimé Auteurs : Gildas Diguet, Auteur ; Guoxing, Lin, Auteur ; Jincan, Chen, Auteur Année de publication : 2014 Article en page(s) : pp. 2395–2402 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Magnetic  refrigeration;  regeneration;  magnetocaloric  material;  room-temperature  applications;  thermodynamics  analysis Résumé : The thermodynamic cycle performance of Gadolinium (Gd) and Gd0.87Dy0.13 used as the working substance in regeneration magnetic Brayton and Ericsson refrigeration cycles are investigated under different external magnetic field conditions. Based on the experimental iso-field heat capacities of Gd with different magnetic fields, the effects of magnetic field change on thermodynamic performances including the magnetic entropy change, cooling quantity, non-perfect regeneration, net cooling quantity, and coefficient of performance (COP) are analyzed and discussed. The present work shows the possibility of reducing the regenerative losses and thereby improving the net cooling quantity for a given field change by selecting optimal initial and final magnetic field values. The similar analysis and calculation of the related thermodynamic performances are further applied to the magnetic material Gd0.87Dy0.13 which exhibits better net cooling quantities when compared to Gd at low temperature. En ligne : www.sciencedirect.com/science/article/pii/S0140700713001722 [article] Impact of the initial field on the thermodynamic performance of room-temperature magnetic refrigeration cycle = Impact du champ initial sur le rendement thermodynamique du cycle frigorifique magnétique à température ambiante [texte imprimé] / Gildas Diguet, Auteur ; Guoxing, Lin, Auteur ; Jincan, Chen, Auteur . - 2014 . - pp. 2395–2402. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 8 (Décembre 2013) . - pp. 2395–2402 Mots-clés : Magnetic  refrigeration;  regeneration;  magnetocaloric  material;  room-temperature  applications;  thermodynamics  analysis Résumé : The thermodynamic cycle performance of Gadolinium (Gd) and Gd0.87Dy0.13 used as the working substance in regeneration magnetic Brayton and Ericsson refrigeration cycles are investigated under different external magnetic field conditions. Based on the experimental iso-field heat capacities of Gd with different magnetic fields, the effects of magnetic field change on thermodynamic performances including the magnetic entropy change, cooling quantity, non-perfect regeneration, net cooling quantity, and coefficient of performance (COP) are analyzed and discussed. The present work shows the possibility of reducing the regenerative losses and thereby improving the net cooling quantity for a given field change by selecting optimal initial and final magnetic field values. The similar analysis and calculation of the related thermodynamic performances are further applied to the magnetic material Gd0.87Dy0.13 which exhibits better net cooling quantities when compared to Gd at low temperature. En ligne : www.sciencedirect.com/science/article/pii/S0140700713001722

Performance characteristics of a regeneration Ericsson refrigeration cycle using a magnetic composite as the working substance / Gildas Diguet 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. 958–964 Titre : Performance characteristics of a regeneration Ericsson refrigeration cycle using a magnetic composite as the working substance Titre original : Caractéristiques de la performance d'un cycle frigorifique d'Ericsson à régénération utilisant un matériau composite magnétique comme substance active Type de document : texte imprimé Auteurs : Gildas Diguet, Auteur ; Guoxing, Lin, Auteur ; Jincan, Chen, Auteur Année de publication : 2013 Article en page(s) : pp. 958–964 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Magnetic  refrigeration;  Room  temperature;  Magnetic  composite  material;  Non-perfect  regeneration;  Field;  Heat  capacity Résumé : Thermodynamic performance analysis for a magnetic composite material in a regeneration Ericsson refrigeration cycle is presented in this article. The regeneration heats in the two regenerative processes of the Ericsson refrigeration cycle are usually non-perfect and this non-perfect regenerative quantity is calculated and analyzed. Furthermore, from the experimental data of iso-field heat capacities of Gd, Gd0.74Tb0.26, and (Gd3.5Tb1.5)Si4, thermodynamic performance of the corresponding composite material, based on these materials, in a regeneration Ericsson refrigeration cycle is evaluated and analyzed. Due to the non-perfect regeneration, the composite cooling quantity and coefficient of performance of the Ericsson refrigeration cycle decrease, but they are still larger than those of each of its compounds. The calculation method of the magnetic composite presented here can be used as a new basis for creating a new magnetic composite with better regeneration processes in the Ericsson refrigeration cycle. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712003301 [article] Performance characteristics of a regeneration Ericsson refrigeration cycle using a magnetic composite as the working substance = Caractéristiques de la performance d'un cycle frigorifique d'Ericsson à régénération utilisant un matériau composite magnétique comme substance active [texte imprimé] / Gildas Diguet, Auteur ; Guoxing, Lin, Auteur ; Jincan, Chen, Auteur . - 2013 . - pp. 958–964. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 3 (Mai 2013) . - pp. 958–964 Mots-clés : Magnetic  refrigeration;  Room  temperature;  Magnetic  composite  material;  Non-perfect  regeneration;  Field;  Heat  capacity Résumé : Thermodynamic performance analysis for a magnetic composite material in a regeneration Ericsson refrigeration cycle is presented in this article. The regeneration heats in the two regenerative processes of the Ericsson refrigeration cycle are usually non-perfect and this non-perfect regenerative quantity is calculated and analyzed. Furthermore, from the experimental data of iso-field heat capacities of Gd, Gd0.74Tb0.26, and (Gd3.5Tb1.5)Si4, thermodynamic performance of the corresponding composite material, based on these materials, in a regeneration Ericsson refrigeration cycle is evaluated and analyzed. Due to the non-perfect regeneration, the composite cooling quantity and coefficient of performance of the Ericsson refrigeration cycle decrease, but they are still larger than those of each of its compounds. The calculation method of the magnetic composite presented here can be used as a new basis for creating a new magnetic composite with better regeneration processes in the Ericsson refrigeration cycle. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712003301