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Time-Lapse 3D Electric Tomography for Short-time Monitoring of an Experimental Heat Storage System

1
Dipartimento di Scienze della Terra, Università degli Studi di Torino, 10125 Torino, Italy
2
Presently at Centre Eau Terre Environnement, Institut National de la Recherche Scientifique, Québec, QC G1K 9A9, Canada
3
Presently at Genovese e Associati, 10126 Torino, Italy
4
Geostudi Astier s.r.l., 57121 Livorno, Italy
*
Author to whom correspondence should be addressed.
Geosciences 2019, 9(4), 167; https://doi.org/10.3390/geosciences9040167
Received: 21 March 2019 / Revised: 5 April 2019 / Accepted: 9 April 2019 / Published: 11 April 2019
(This article belongs to the Special Issue Subsurface Thermography and the Use of Temperature in Geosciences)
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Abstract

A borehole thermal energy storage living lab was built nearby Torino (Northern Italy). The aim of this living lab is to test the ability of the alluvial deposits of the north-western Po Plain to store the thermal energy collected by solar panels. Monitoring the temperature distribution induced in the underground and the effectiveness of the heat storage in this climatic context is not an easy task. For this purpose, different temperature evolution strategies are compared in this paper: Local temperature measurements, numerical simulations and geophysical surveys. These different approaches were compared during a single day of operation of the living lab. The results of this comparison allowed to underline the effectiveness of time-lapse 3D electric resistivity tomography as a non-invasive and cost-effective qualitative heat monitoring tool. This was obtained even in a test site with unfavorable thermo-hydrogeological conditions and high-level anthropic noise. Moreover, the present study demonstrated that, if properly calibrated with local temperature values, time-lapse 3D electric resistivity tomography also provides a quantitative estimation of the underground temperature. View Full-Text
Keywords: time-lapse 3D Electrical Resistivity Tomography; borehole thermal energy storage; numerical modelling; FeFlow; temperature monitoring time-lapse 3D Electrical Resistivity Tomography; borehole thermal energy storage; numerical modelling; FeFlow; temperature monitoring
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Comina, C.; Giordano, N.; Ghidone, G.; Fischanger, F. Time-Lapse 3D Electric Tomography for Short-time Monitoring of an Experimental Heat Storage System. Geosciences 2019, 9, 167.

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