Consiglio Nazionale delle Ricerche

Tipo di prodottoAbstract in atti di convegno
TitoloA Comparison Between Traditional and Hybrid Optic Fibre Based Ground Thermal Response Tests
Anno di pubblicazione2020
Autore/iGiorgia DALLA SANTA, Luca SCHENATO, Philippe PASQUIER, Antonio GALGARO
Affiliazioni autoriDepartment of Geosciences, Università di Padova Italy Institute of Geosciences and Earth Resources - CNR, Padova,Italy Research Institute for Geo-Hydrological Protection, National Research Council Département des génies civil, géologique et des mines, Polytechnique Montréal (Canada).
Autori CNR e affiliazioni
  • inglese
AbstractThe importance of analysing and understanding the entity of the ground thermal conductivity aimed at evaluating the heat exchange capability in ground-source heat-pump (GSHP) applications is crucial. The subsoil represents the limiting factor in borehole heat exchanger (BHE) field design for building conditioning, due to its immutability and the cumbersome expenses associated with the installation drilling phase. Currently, there are several methods for assessing the thermal properties of a geological setting: laboratory analyses on sample corings, thermal response tests (TRTs) and distributed TRTs carried out with fibre optic sensors. In this regard, a GSHP system of more than 60 BHEs 120m deep has been realized at the new humanistic campus of the University of Padova (Italy). The coring provided a detailed stratigraphic sequence of unconsolidated alluvial deposits. Besides, the monitoring well has been equipped with a hybrid optical fibre cable integrating some electrical wires conductors and a bundle of fibre optics, sealed into the well. The fibre optic cable has been used here in an active mode to perform an Enhanced Thermal Response Test (ETRT) by injecting a constant heating power through the electrical wires contained within the cable structure and by measuring the transient thermal behaviour of the borehole. This kind of TRT has distributed features because exploits the optical fibre sensing technology to provide a spatial distributed representation of the behaviour of the subsoil along the stratigraphic succession. In the paper, the data acquired from the distributed ETRT have been analysed with two different method (analysis of the measured temperature by applying the first-order approximation of the infinite line-source model and the derivative analysis); the results are compared each other and to the global thermal conductivity provided by the traditional TRT in relation to the local stratigraphic succession.
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Verificato da refereeSì: Internazionale
Stato della pubblicazionePublished version
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Parole chiaveGeothermal resources, Distributed temperature sensing
Link (URL, URI)-
Titolo convegno/congressoWorld Geothermal Congress 2020
Luogo convegno/congressoReykjavik, Iceland
Data/e convegno/congresso21-26/05/2021
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Strutture CNR
  • IRPI — Istituto di ricerca per la protezione idrogeologica
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