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Influence de la porosité sur les propriétés thermoélectriques du Fe2VAl et sur les performances d'un module thermoélectrique transverse Fe2VAl/Cu

Rousseaux, Romain
(2023)

Files

Rousseaux_48691600_2023.pdf
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Details

Supervisors
Jacques, Pascal
Faculty
Ecole polytechnique de Louvain
Degree label
Master [120] : ingénieur civil mécanicien, à finalité spécialisée
Abstract
enThe global energy crisis makes it urgent to introduce new alternatives for energy production. Thermoelectric power generation technology has proven to be essential in all renewable energy conversion technologies. Therefore, thermoelectric materials could be one of the solutions to fight the global energy crisis and alleviate the daily pollution. In this work, we first study the influence of porosity on the thermoelectric properties of Fe2VAl, then we also study the influence of this porosity on the performance of a Fe2VAl/Copper thermoelectric module. Different samples of Fe2VAl were made by sintering to obtain different porosity values. The various measures of thermoelectric properties have proved beneficial for the figure of merit since it has been increased for increasing porosity values. The increase in this figure of merit would be the result of inhomogeneity in the Fe2VAl microstructure. By choosing the optimal sintering conditions that form the microstructure, the figure of merit would be optimized. Many models exist to model the thermal and electrical conductivities of materials according to their porosity, but few models focus on thermoelectric materials. We have shown that it is possible to integrate a modeling of the impact of Fe2VAl porosity on its conductivities, provided that an empirical parameter is chosen appropriately. This empirical parameter depends on the microstructure of the Fe2VAl, which proved to be very inhomogeneous. Finally, by performing a simulation, we showed that it was possible to increase the value of the figure of merit of a transverse Fe2VAl/Copper thermoelectric module when the porosity in the Fe2VAl increases, choosing the optimal tilt angle. This is the result of the interdependence of very different thermoelectric parameters for Fe2VAl and copper.