Use of 3D electrical resistivity tomography to improve the design of low enthalpy geothermal systems

[EN] In designing low enthalpy geothermal systems, the ideal location and length of the boreholes in the well-field is the key to improve the performance and reduce the costs of the installation. The correct assessment of the heat conductivity of the ground (λ) plays also a very important role in es...

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Autores: Martín Nieto, Ignacio, Farfán Martín, Arturo Rafael, Sáez Blázquez, Cristina, González Aguilera, Diego, Carrasco García, Pedro, Farfán Vasco, Emilio, Carrasco García, Javier
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2019
País:España
Recursos:Universidad de Salamanca (USAL)
Repositorio:GREDOS. Repositorio Institucional de la Universidad de Salamanca
OAI Identifier:oai:gredos.usal.es:10366/149826
Acesso em linha:http://hdl.handle.net/10366/149826
Access Level:acceso abierto
Palavra-chave:Electrical resistivity
Thermal conductivity
Granite type rocks (adamellites)
Design of the well field
2511.07 Ingeniería de Suelos
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spelling Use of 3D electrical resistivity tomography to improve the design of low enthalpy geothermal systemsMartín Nieto, IgnacioFarfán Martín, Arturo RafaelSáez Blázquez, CristinaGonzález Aguilera, DiegoCarrasco García, PedroFarfán Vasco, EmilioCarrasco García, JavierElectrical resistivityThermal conductivityGranite type rocks (adamellites)Design of the well field2511.07 Ingeniería de Suelos[EN] In designing low enthalpy geothermal systems, the ideal location and length of the boreholes in the well-field is the key to improve the performance and reduce the costs of the installation. The correct assessment of the heat conductivity of the ground (λ) plays also a very important role in estimating the amount of energy that we are going to be able to obtain from the subsoil and the ideal pace of the process. In low enthalpy geothermal installations based on granite type environments is especially important to improve the information we have from the subsoil at a small scale. This is due to the great horizontal variation we can find on this kind of terrain. Electrical conductivity (C = 1/ρ, ρ = resistivity in ohm meters) can be related to thermal conductivity (λ) of many rock types (Directive (EU), 2019) (see Robertson, 1988). We show that a 3D electrical resistivity survey can be used as a proxy for λ in terrain with weathered and solid granitic rock. Knowledge of λ is essential for the design of efficient ground source heat pump systems that use vertical wells for closed-loop systems. Shorter well lengths are accomplished if wells are in solid granite with high λ. Furthermore the electrical resistivity survey identifies low density, clayey subsurface materials that may require specialized drilling methods. Project cost savings can result from shorter borehole lengths, number of holes, and correct drilling methods.Elsevier202220222019info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10366/149826reponame:GREDOS. Repositorio Institucional de la Universidad de Salamancainstname:Universidad de Salamanca (USAL)InglésAttribution-NonCommercial-NoDerivatives 4.0 Internacionalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:gredos.usal.es:10366/1498262026-06-07T06:28:51Z
dc.title.none.fl_str_mv Use of 3D electrical resistivity tomography to improve the design of low enthalpy geothermal systems
title Use of 3D electrical resistivity tomography to improve the design of low enthalpy geothermal systems
spellingShingle Use of 3D electrical resistivity tomography to improve the design of low enthalpy geothermal systems
Martín Nieto, Ignacio
Electrical resistivity
Thermal conductivity
Granite type rocks (adamellites)
Design of the well field
2511.07 Ingeniería de Suelos
title_short Use of 3D electrical resistivity tomography to improve the design of low enthalpy geothermal systems
title_full Use of 3D electrical resistivity tomography to improve the design of low enthalpy geothermal systems
title_fullStr Use of 3D electrical resistivity tomography to improve the design of low enthalpy geothermal systems
title_full_unstemmed Use of 3D electrical resistivity tomography to improve the design of low enthalpy geothermal systems
title_sort Use of 3D electrical resistivity tomography to improve the design of low enthalpy geothermal systems
dc.creator.none.fl_str_mv Martín Nieto, Ignacio
Farfán Martín, Arturo Rafael
Sáez Blázquez, Cristina
González Aguilera, Diego
Carrasco García, Pedro
Farfán Vasco, Emilio
Carrasco García, Javier
author Martín Nieto, Ignacio
author_facet Martín Nieto, Ignacio
Farfán Martín, Arturo Rafael
Sáez Blázquez, Cristina
González Aguilera, Diego
Carrasco García, Pedro
Farfán Vasco, Emilio
Carrasco García, Javier
author_role author
author2 Farfán Martín, Arturo Rafael
Sáez Blázquez, Cristina
González Aguilera, Diego
Carrasco García, Pedro
Farfán Vasco, Emilio
Carrasco García, Javier
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Electrical resistivity
Thermal conductivity
Granite type rocks (adamellites)
Design of the well field
2511.07 Ingeniería de Suelos
topic Electrical resistivity
Thermal conductivity
Granite type rocks (adamellites)
Design of the well field
2511.07 Ingeniería de Suelos
description [EN] In designing low enthalpy geothermal systems, the ideal location and length of the boreholes in the well-field is the key to improve the performance and reduce the costs of the installation. The correct assessment of the heat conductivity of the ground (λ) plays also a very important role in estimating the amount of energy that we are going to be able to obtain from the subsoil and the ideal pace of the process. In low enthalpy geothermal installations based on granite type environments is especially important to improve the information we have from the subsoil at a small scale. This is due to the great horizontal variation we can find on this kind of terrain. Electrical conductivity (C = 1/ρ, ρ = resistivity in ohm meters) can be related to thermal conductivity (λ) of many rock types (Directive (EU), 2019) (see Robertson, 1988). We show that a 3D electrical resistivity survey can be used as a proxy for λ in terrain with weathered and solid granitic rock. Knowledge of λ is essential for the design of efficient ground source heat pump systems that use vertical wells for closed-loop systems. Shorter well lengths are accomplished if wells are in solid granite with high λ. Furthermore the electrical resistivity survey identifies low density, clayey subsurface materials that may require specialized drilling methods. Project cost savings can result from shorter borehole lengths, number of holes, and correct drilling methods.
publishDate 2019
dc.date.none.fl_str_mv 2019
2022
2022
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10366/149826
url http://hdl.handle.net/10366/149826
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:GREDOS. Repositorio Institucional de la Universidad de Salamanca
instname:Universidad de Salamanca (USAL)
instname_str Universidad de Salamanca (USAL)
reponame_str GREDOS. Repositorio Institucional de la Universidad de Salamanca
collection GREDOS. Repositorio Institucional de la Universidad de Salamanca
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869423116178948096
score 15.301603

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