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Etude de l'impact des conditions géologiques et climatiques sur l'efficacité énergétique des systèmes géothermiques de surface

Abstract : Surface geothermal systems extract energy from the ground via a fluid circulating in an exchanger at a depth not exceeding 200 m. Two typologies of exchangers are generally used: systems with vertical exchangers, mainly affected by geological conditions; and horizontal exchangers, closer to the surface of ground, impacted mainly by weather conditions. Thermal exchanges in the soil are mainly conduction heat transfers. Thus, thermo-physical properties of soil influence, mostly, energy extracted by exchangers. In order to quantify influence of geological and meteorological conditions on thermo-physical properties of soil, two experimental devices are developed, designed, instrumented and validated. The experimental results provide more appropriate scientific knowledge on hydric behavior of a soil subjected to rain events and influence of compactness on thermal properties of soil. In addition, one numerical study, based on a finite element 2D modeling of an earth-air heat exchanger, evaluates their energy performance under different soil moisture conditions and rain scenarios thus revealing the utility of water to significantly improve its performance.
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Submitted on : Friday, February 23, 2018 - 3:44:09 PM
Last modification on : Wednesday, May 27, 2020 - 3:09:34 AM
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Cuny_Mathias_2017_ED269.pdf
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  • HAL Id : tel-01716379, version 1

Citation

Mathias Cuny. Etude de l'impact des conditions géologiques et climatiques sur l'efficacité énergétique des systèmes géothermiques de surface. Géotechnique. Université de Strasbourg, 2017. Français. ⟨NNT : 2017STRAD028⟩. ⟨tel-01716379⟩

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