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Theses

Récupération d’énergie issue des variations temporelles de la température par effet pyroélectrique

Abstract : This experimental thesis focuses on the energy harvesting for micro-generators and au- tonomy of electronic devices with low consumption. This work proposes the possibilities of har- vesting thermal energy by pyroelectric effect. The thermal energy to be converted is thermal fluc- tuations. We proposed two main techniques to generate electricity by pyroelectric ceramic. The first one focuses on the harvesting of infrared radiation associated with the SSHI technique. Ori- ginally, the SSHI technique was developed in the case of the piezoelectric energy harvesting, but we applied it in the case of pyroelectricity and which allowed us to maximize the harvested power by a factor of 2. The second proposed technique concerns the harvesting of thermal fluctuations resulting from convective movements originating inside a fluid in the Rayleigh-Bernard configu- ration. We have carried out several studies to increase the convective transfer in order to improve the pyroelectricresponse and maximize the harvested power. In the case of natural convection, the choice of a suitable fluid and the optimization of the control parameters of the Rayleigh-Bernard configuration are essential steps in order to achieve better heat transfer by convection. In the case of forced convection, it has been studied the advantage of dispersing copper nanoparticles in a pure fluid to increase the convective transfer. With this nanofluid, the pyroelectric response was maximized by a factor of 10.
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Fatima Zahra El Fatnani. Récupération d’énergie issue des variations temporelles de la température par effet pyroélectrique. Electronique. Université de Lyon; Université Hassan II (Casablanca, Maroc), 2017. Français. ⟨NNT : 2017LYSEI088⟩. ⟨tel-02061314⟩

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