Assessment of near Pr2/3Sr1/3MnO3 oxide in magnetic cooling

Autor: K. El Maalam, Omar Mounkachi, P. de Rango, A. El Boukili, Mohamed Balli, O. Chdil
Rok vydání: 2022
Předmět:
Zdroj: International Journal of Refrigeration. 133:302-312
ISSN: 0140-7007
DOI: 10.1016/j.ijrefrig.2021.10.005
Popis: In this work, we report a detailed study of the thermodynamic performance of Pr 0.6 Sr 0.4 MnO 3 in a functional magnetic cooling system up to the theoretical limit of its magnetocaloric effect. For this purpose, a one-dimensional numerical model of the active magnetic regenerator (AMR) cycle is developed, while the required magnetocaloric properties of the oxide are calculated in the framework of mean field theory. The obtained results are deeply analyzed and then compared with the reference gadolinium metal. Particularly, it is revealed that using Pr 0.6 Sr 0.4 MnO 3 as refrigerant requires high magnetic fields to generate reasonable temperature spans for practical applications, as it was found that under a magnetic field of 8 T, the studied oxide can generate an AMR temperature span of 33 K. The thermodynamic efficiency was evaluated by directly considering the work arising from the magnetic forces between the Pr 0.6 Sr 0.4 MnO 3 regenerator and the magnetic field source, as the associated magnetic work is numerically calculated by using Altair Flux 3D software. From the obtained results, it was found that the coefficient of performance can be enhanced by a factor of two when balancing magnetic forces despite of the moderate magnetocaloric effect shown by Pr 0.6 Sr 0.4 MnO 3 under the practical fields going from 1 to 2 T. Moreover, the hidden thermodynamic performances of this compound are also pointed out by investigating its magnetocaloric properties in the theoretical limit zone. In this way, our calculations unveil that it is possible to reach cold source temperatures under − 22 ∘ C even when using helium as heat transfer fluid.
Databáze: OpenAIRE
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