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Use of distributed temperature sensing (DTS) coupled to ground source heat exchangers for geological thermo-stratigraphic correlation

TitleUse of distributed temperature sensing (DTS) coupled to ground source heat exchangers for geological thermo-stratigraphic correlation
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2024
AuthorsViolante, A.C., Guidi G., Proposito Marco, Mataloni S., and Spaziani Fabio
JournalRenewable Energy
Volume225
ISSN09601481
KeywordsAquifers, Distributed temperature sensing, Fiber optics, Fiber-optics, Geothermal fields, Ground source, Ground source heat exchanger, groundwater, Groundwater resources, Heat exchangers, instrumentation, Italy, Lazio, mantle upwelling, Roma [Lazio], Rome, Stratigraphic correlation, Stratigraphy, temperature effect, Temperature sensors, Thermal characterization, Thermal conductivity, Thermal response test, Thermo-stratigraphic correlation
Abstract

The thermal characterisation of a geosonde field, consisting of four boreholes at the ENEA-Casaccia Research Centre (Rome, Italy), was carried out by processing the temperature values measured by DTS (Distributed Temperature Sensing) fibre optics positioned vertically in each well. By correlating the vertical temperature profiles, it was possible to estimate the thermal conductivity of each stratigraphic level and the contribution of the groundwater on the heat exchange between ground and geothermal probes. The theoretical model has been confirmed by the experimental data obtained through direct measurement of thermal conductivity on soil/rock samples collected at different depths. In the first 10 m of depth, temperature variations are influenced by seasonal climatic fluctuations, the amplitude of which decreases with depth, to regularise and assume a linear trend, compatible with the movement of groundwater. The work carried out has shown that the area investigated is affected by the upwelling of hydrothermal fluids from the deep aquifer, which infiltrate the fractured lavas reaching the most superficial layers of the subsurface. The results of this research could be useful for estimating the geothermal potential of the areas within the ‘Cesano geothermal field’, whose lithotypes belong to the Sabatini volcanic province. © 2024 The Authors

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85186954226&doi=10.1016%2fj.renene.2024.120242&partnerID=40&md5=15ff6dc7f579090e8bd94726ea3d7271
DOI10.1016/j.renene.2024.120242
Citation KeyViolante2024