Chicco J

Giuli G

Invernizzi C

Verda V

English

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18 October 2022POLITECNICO DI TORINORepository ISTITUZIONALEThe role of hydrogeological conditions and thermophysical properties o the evaluation of geothermal exchange potential /Chicco, J; Invernizzi, C; Verda, V; Giuli, G. - (2015). ((Intervento presentato al convegno 26th IUGG General Assembly2015, General Assembly 2015 tenutosi a Praga, Repubblica Ceca nel Giugno/Luglio 2015.OriginalThe role of hydrogeological conditions and thermophysical properties o the evaluation of geothermalexchange potentialPublisher:PublishedDOI:Terms of use:openAccessPublisher copyright(Article begins on next page)This article is made available under terms and conditions as specified in the  corresponding bibliographic description inthe repositoryAvailability:This version is available at: 11583/2915494 since: 2021-07-28T00:03:08ZIHFCGeophysical Research AbstractsVol. 18, EGU2016-16938, 2016EGU General Assembly 2016© Author(s) 2016. CC Attribution 3.0 License.The role of hydrogeological conditions and thermophysical properties onthe evaluation of geothermal exchange potential in Central ItalyJessica Chicco (1), Massimo Verdoya (2), Vittorio Verda (3), and Chiara Invernizzi (4)(1) University of Camerino, School of Science and Technology, Geology, Camerino, Italy (jessica.chicco@unicam.it), (2)Department of Earth, Environment and Life Sciences - DISTAV, Genoa,Italy (verdoya@dipteris.unige.it), (3) Department ofEnergy – DENERG, Polytechnic of Turin (vittorio.verda@polito.it), (4) University of Camerino, School of Science andTechnology, Geology, Camerino, Italy (chiara.invernizzi@unicam.it)Within the framework of the EU strategy for sustainable development, the exploitation of the shallow subsurfacegeothermal resources is of great relevance. In this regard, a multidisciplinary investigation aimed at optimisingthe performance of borehole heat exchangers is in progress in the Marche region (Central Italy). In particular, animprovement of the present-day knowledge about thermo-physical parameters of the sedimentary deposits formingthe Umbria-Marche succession, as well as the hydrogeological setting and geological structures, is fundamental inorder to obtain a better picture of the regional geothermal exchange potential. Therefore, we carried out accuratelaboratory measurements of thermal conductivity, volume heat capacity, thermal diffusivity, porosity, and densityof both core and outcrop samples of the main geological formations of Marche, Moreover, the mineralogicalcontent was defined through XRD diffraction. Because climatic variations can influence the moisture content ofthe shallower portions of the subsoil, the groundwater physical properties (temperature and electrical conductivityabove all), have been continuously monitored for several years. Based on the collected data, a detailed thermo-fluiddynamic modelling was carried out under different, hydrogeological and geo-structural conditions to calculate theeffect of groundwater velocity on the heat exchange between the boreholes and the ground. A relation, based onwell-known non-dimensional parameters, was obtained in order to correct the purely conductive heat transfer onthe basis of groundwater velocity. The preliminary results show that groundwater plays an important role, givingrise to higher heat exchange coefficients. This improves the present-day knowledge of the geothermal exchangepotential in the region and overtakes previous analyses that only considered heat conduction.

The role of hydrogeological conditions and thermophysical properties o the evaluation of geothermal exchange potential

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The role of hydrogeological conditions and thermophysical properties o the evaluation of geothermal exchange potential

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