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A review of exploiting shallow geothermal energy through tunnels: Current status and future prospects.

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Title: A review of exploiting shallow geothermal energy through tunnels: Current status and future prospects.
Authors: Magdy, Alaaeldin1 (AUTHOR) Alaaeldin.ogail@univ-lille.fr, Ogunleye, Oluwaseun2 (AUTHOR) Oluwaseun.ogunleye@hotmail.com, Mroueh, Hussein1 (AUTHOR) Hussein.mroueh@univ-lille.fr, Di Donna, Alice3 (AUTHOR) Alice.di-donna@univ-grenoble-alpes.fr, Singh, Rao Martand4 (AUTHOR) rao.m.singh@ntnu.no
Source: Renewable Energy: An International Journal. Jan2025, Vol. 238, pN.PAG-N.PAG. 1p.
Subject Terms: *Ground source heat pump systems, *Heat storage, *Renewable energy sources, *Geothermal resources, *Natural gas, Natural gas consumption, Tunnel design & construction
Abstract: The utilization of ground-embedded structures for harnessing geothermal energy in space heating and cooling has gained significant attention over the past two decades. In this context, this paper reviews the use of tunnels, commonly known as energy tunnels, for exploiting shallow geothermal energy, providing an overview of the current status and future prospects. The different tunnel construction methods and their respective thermal activation processes are described. The factors influencing thermal performance and mechanical responses are analysed, alongside the economic and environmental benefits. This review confirms the viability of energy tunnels as a sustainable and renewable solution, as several studies have demonstrated their potential in providing a substantial amount of thermal energy and reducing natural gas consumption and significantly cutting CO 2 emissions. Energy tunnels can also potentially provide a reliable solution for road de-icing or enable efficient thermal energy storage when groundwater flow is negligible. Finally, current, and future innovations aimed at maximizing shallow geothermal exploitation are discussed, with a call for further research to explore additional thermal retrofitting techniques for the existing tunnels, innovative additions for lining concrete, fluid and pipe materials and integrating energy tunnels with other renewable energy sources in district heating networks. [ABSTRACT FROM AUTHOR]
Copyright of Renewable Energy: An International Journal is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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An: 181545180
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  Data: A review of exploiting shallow geothermal energy through tunnels: Current status and future prospects.
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  Data: <searchLink fieldCode="AR" term="%22Magdy%2C+Alaaeldin%22">Magdy, Alaaeldin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> Alaaeldin.ogail@univ-lille.fr</i><br /><searchLink fieldCode="AR" term="%22Ogunleye%2C+Oluwaseun%22">Ogunleye, Oluwaseun</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> Oluwaseun.ogunleye@hotmail.com</i><br /><searchLink fieldCode="AR" term="%22Mroueh%2C+Hussein%22">Mroueh, Hussein</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> Hussein.mroueh@univ-lille.fr</i><br /><searchLink fieldCode="AR" term="%22Di+Donna%2C+Alice%22">Di Donna, Alice</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> Alice.di-donna@univ-grenoble-alpes.fr</i><br /><searchLink fieldCode="AR" term="%22Singh%2C+Rao+Martand%22">Singh, Rao Martand</searchLink><relatesTo>4</relatesTo> (AUTHOR)<i> rao.m.singh@ntnu.no</i>
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  Data: <searchLink fieldCode="JN" term="%22Renewable+Energy%3A+An+International+Journal%22">Renewable Energy: An International Journal</searchLink>. Jan2025, Vol. 238, pN.PAG-N.PAG. 1p.
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  Data: *<searchLink fieldCode="DE" term="%22Ground+source+heat+pump+systems%22">Ground source heat pump systems</searchLink><br />*<searchLink fieldCode="DE" term="%22Heat+storage%22">Heat storage</searchLink><br />*<searchLink fieldCode="DE" term="%22Renewable+energy+sources%22">Renewable energy sources</searchLink><br />*<searchLink fieldCode="DE" term="%22Geothermal+resources%22">Geothermal resources</searchLink><br />*<searchLink fieldCode="DE" term="%22Natural+gas%22">Natural gas</searchLink><br /><searchLink fieldCode="DE" term="%22Natural+gas+consumption%22">Natural gas consumption</searchLink><br /><searchLink fieldCode="DE" term="%22Tunnel+design+%26+construction%22">Tunnel design & construction</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The utilization of ground-embedded structures for harnessing geothermal energy in space heating and cooling has gained significant attention over the past two decades. In this context, this paper reviews the use of tunnels, commonly known as energy tunnels, for exploiting shallow geothermal energy, providing an overview of the current status and future prospects. The different tunnel construction methods and their respective thermal activation processes are described. The factors influencing thermal performance and mechanical responses are analysed, alongside the economic and environmental benefits. This review confirms the viability of energy tunnels as a sustainable and renewable solution, as several studies have demonstrated their potential in providing a substantial amount of thermal energy and reducing natural gas consumption and significantly cutting CO 2 emissions. Energy tunnels can also potentially provide a reliable solution for road de-icing or enable efficient thermal energy storage when groundwater flow is negligible. Finally, current, and future innovations aimed at maximizing shallow geothermal exploitation are discussed, with a call for further research to explore additional thermal retrofitting techniques for the existing tunnels, innovative additions for lining concrete, fluid and pipe materials and integrating energy tunnels with other renewable energy sources in district heating networks. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Renewable Energy: An International Journal is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.renene.2024.121958
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      – Code: eng
        Text: English
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        StartPage: N.PAG
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      – SubjectFull: Ground source heat pump systems
        Type: general
      – SubjectFull: Heat storage
        Type: general
      – SubjectFull: Renewable energy sources
        Type: general
      – SubjectFull: Geothermal resources
        Type: general
      – SubjectFull: Natural gas
        Type: general
      – SubjectFull: Natural gas consumption
        Type: general
      – SubjectFull: Tunnel design & construction
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      – TitleFull: A review of exploiting shallow geothermal energy through tunnels: Current status and future prospects.
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            NameFull: Magdy, Alaaeldin
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              Text: Jan2025
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              Y: 2025
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              Value: 238
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