Chicco J

Invernizzi C

Marziali E

English

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29 November 2022POLITECNICO DI TORINORepository ISTITUZIONALEGeological, hydrogeological and thermal characterization of deep subsoil (Marche Region, Italy) linked to use of lowenthalpy geothermal heat pumps / Chicco, J; Invernizzi, C; Marziali, E. - (2013). ((Intervento presentato al convegno 3rdScientific Day of the School of Science and Technology tenutosi a Camerino, Italy nel Giugno 2013.OriginalGeological, hydrogeological and thermal characterization of deep subsoil (Marche Region, Italy) linkedto use of low enthalpy geothermal heat pumpsPublisher: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: 11583/2915490 since: 2021-07-27T23:46:40ZUniversity of CamerinoGeological, hydrogeological and thermal characterization of deep subsoil (Marche Region, Italy) linked to use of low enthalpy geothermal heat pumps.                                   Chicco J.,a Invernizzi C.,b Marziali  E.c  a, bSchool of Science and Technology, Geology Division, University of Camerino, Via Gentile III da Varano I, 62032 Camerino (MC);e-mail: jessica.chicco@unicam.it;chiara.invernizzi@unicam.it  cGruppo Ergon Bluenergy, Via dell’Industria, 62010 Loc. Passo di Treia (MC); e-mail: marziali@ergon.biz It is well known that geothermal energy is a clean and sustainable source of energy, directly coming from the Earth. Geothermal energy resources range from hot water and hot rock found a few meters beneath the Earth’s surface and down even deeper to the extremely high temperatures. Common uses of geothermal energy include direct use systems providing direct heat for residential, industrial and commercial purposes. This has many advantages both for environment and for heating bill, because it is much less expensive than using traditional fuels. In this regard, the aim of the PhD project in collaboration with Ergon Bluenergy Group, is to increase the knowledge of the subsoil of Marche Region1 through its geological, hydrogeological and thermal3 characterization. This study, is of primary importance to understand the correct depth of well drilling to extract the necessary amount of heat for buildings energy need and to perform low enthalpy geothermal plants, linked to use of geothermal probes and heat pumps at a specific depth of investigation (until 400 m a.s.l.). Our preliminary studies focused on the connections of three important parameters such as lithology, depth and thermal conductivity, useful to find T values at depth and essentials to create a thermal modelling of the subsoil. Data from well profiles drilled to find hydrocarbon in Marche Region2 show that in Jesi, Macerata and Fano surroundings, at depths ranging between 100 and 308,50 m a.s.l., variable T values corresponds to variable lithologies (from 20°C to 28°C for clay lithologies and of 34°C for sandy clay lithologies). This means that more porous and permeable lithologies, particularly in presence of water circulation in sediments at the same depths, show a strong increase of T values. Another important factor to consider is thermal conductivity that notably increases from impermeable (e.g. clay) to permeable lithologies. A significant example of this could be the Fossombrone area4, where calcareous sediments at shallow depths probably indicate higher T values than those seen in Jesi, Macerata and Fano surroundings (with clay and sandy clay lithologies) at the same depths. This is supposed on the basis of higher thermal conductivity values of the limestones with respect to clays.  References: 1) Centamore E; Deaiana G. La geologia delle Marche 1986, Studi Geologici Camerti (volume speciale), 145 pp.  2) Ministero dello Sviluppo Economico, direzione generale per le risorse minerarie ed energetiche CNR-ENEA-ENEL-ENI/AGIP Inventario delle risorse geotermiche nazionali, Regione Marche - All. B Misure di temperatura in pozzo 1987, I-798. 3) Ministero dello Sviluppo Economico, direzione generale per le risorse minerarie ed energetiche CNR-ENEA-ENEL-ENI/AGIP Pozzi perforati a scopo esplorativo 1959-62. 4) Norden B. Geothermal Energy Utilization in Low-Enthalpy Sedimentary Environments 2011, Scientific tecnica report STR 11/06, I-101.     	  

Geological, hydrogeological and thermal characterization of deep subsoil (Marche Region, Italy) linked to use of low enthalpy geothermal heat pumps

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Geological, hydrogeological and thermal characterization of deep subsoil (Marche Region, Italy) linked to use of low enthalpy geothermal heat pumps

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