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| Titel |
Rock thermal conductivity as key parameter for geothermal numerical models |
| VerfasserIn |
Eloisa Di Sipio, Sergio Chiesa, Elisa Destro, Antonio Galgaro, Aurelio Giaretta, Gianluca Gola, Adele Manzella |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250080320
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| Zusammenfassung |
| The geothermal energy applications are undergoing a rapid development. However, there are
still several challenges in the successful exploitation of geothermal energy resources. In
particular, a special effort is required to characterize the thermal properties of the ground
along with the implementation of efficient thermal energy transfer technologies. This paper
focuses on understanding the quantitative contribution that geosciences can receive from the
characterization of rock thermal conductivity.
The thermal conductivity of materials is one of the main input parameters in geothermal
modeling since it directly controls the steady state temperature field. An evaluation of this
thermal property is required in several fields, such as Thermo-Hydro-Mechanical
multiphysics analysis of frozen soils, designing ground source heat pumps plant, modeling
the deep geothermal reservoirs structure, assessing the geothermal potential of
subsoil.
Aim of this study is to provide original rock thermal conductivity values useful for the
evaluation of both low and high enthalpy resources at regional or local scale. To
overcome the existing lack of thermal conductivity data of sedimentary, igneous and
metamorphic rocks, a series of laboratory measurements has been performed on
several samples, collected in outcrop, representative of the main lithologies of the
regions included in the VIGOR Project (southern Italy). Thermal properties tests were
carried out both in dry and wet conditions, using a C-Therm TCi device, operating
following the Modified Transient Plane Source method.Measurements were made at
standard laboratory conditions on samples both water saturated and dehydrated with a
fan-forced drying oven at 70 Ë C for 24 hr, for preserving the mineral assemblage and
preventing the change of effective porosity. Subsequently, the samples have been stored
in an air-conditioned room while bulk density, solid volume and porosity were
detected.
The measured thermal conductivity values of rocks and loose materials have
been validated by comparison with data published in the international literature. |
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