Thermal effect of a borehole thermal energy store on the subsurface

Philipp Mielke; Dan Bauer; Sebastian Homuth; Annette Götz; Ingo Sass

doi:10.1186/s40517-014-0005-1

Thermal effect of a borehole thermal energy store on the subsurface

Philipp Mielke, Dan Bauer, Sebastian Homuth, Annette Götz, Ingo Sass

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Abstract

Background: The thermal effect on the subsurface of a large borehole thermal energy store (BTES) has been investigated by coupling measured rock properties with an enhanced FEFLOW simulation.

Methods: The finite element model has been validated against measured data from a 2-year operation period. The thermal changes in the subsurface have been predicted by simulation for a 30-year operation period. The model is based on three 80-m core sections drilled in Triassic carbonates, which have been analyzed in detail with respect to lithology, facies, and thermal and hydraulic parameters.

Results: The model shows thermal effects of the BTES on the subsurface at a distance of approximately 350 m after 10 years and a distance of approximately 850 m after 30 years of operation. At a distance of 100 m, the temperature of the subsurface rises by 2 K after 30 years.

Conclusions: The simulation describes the real BTES in an accurate manner and is suited for predicting the thermal changes in the subsurface for long-term operational durations.

Original language	English
Journal	Geothermal Energy
Volume	2
Issue number	1
Early online date	29 Apr 2014
DOIs	https://doi.org/10.1186/s40517-014-0005-1
Publication status	Published - 1 Dec 2014
Externally published	Yes

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

Keywords

borehole thermal energy store
borehole heat exchanger system
heat and mass trasnport model
geothermal parameters
Triassic carbonates

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10.1186/s40517-014-0005-1

Thermal effect of a boreholeFinal published version, 3.8 MBLicence: CC BY

Cite this

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title = "Thermal effect of a borehole thermal energy store on the subsurface",

abstract = "Background: The thermal effect on the subsurface of a large borehole thermal energy store (BTES) has been investigated by coupling measured rock properties with an enhanced FEFLOW simulation. Methods: The finite element model has been validated against measured data from a 2-year operation period. The thermal changes in the subsurface have been predicted by simulation for a 30-year operation period. The model is based on three 80-m core sections drilled in Triassic carbonates, which have been analyzed in detail with respect to lithology, facies, and thermal and hydraulic parameters. Results: The model shows thermal effects of the BTES on the subsurface at a distance of approximately 350 m after 10 years and a distance of approximately 850 m after 30 years of operation. At a distance of 100 m, the temperature of the subsurface rises by 2 K after 30 years. Conclusions: The simulation describes the real BTES in an accurate manner and is suited for predicting the thermal changes in the subsurface for long-term operational durations.",

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author = "Philipp Mielke and Dan Bauer and Sebastian Homuth and Annette G{\"o}tz and Ingo Sass",

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language = "English",

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T1 - Thermal effect of a borehole thermal energy store on the subsurface

AU - Mielke, Philipp

AU - Bauer, Dan

AU - Homuth, Sebastian

AU - Götz, Annette

AU - Sass, Ingo

PY - 2014/12/1

Y1 - 2014/12/1

N2 - Background: The thermal effect on the subsurface of a large borehole thermal energy store (BTES) has been investigated by coupling measured rock properties with an enhanced FEFLOW simulation. Methods: The finite element model has been validated against measured data from a 2-year operation period. The thermal changes in the subsurface have been predicted by simulation for a 30-year operation period. The model is based on three 80-m core sections drilled in Triassic carbonates, which have been analyzed in detail with respect to lithology, facies, and thermal and hydraulic parameters. Results: The model shows thermal effects of the BTES on the subsurface at a distance of approximately 350 m after 10 years and a distance of approximately 850 m after 30 years of operation. At a distance of 100 m, the temperature of the subsurface rises by 2 K after 30 years. Conclusions: The simulation describes the real BTES in an accurate manner and is suited for predicting the thermal changes in the subsurface for long-term operational durations.

AB - Background: The thermal effect on the subsurface of a large borehole thermal energy store (BTES) has been investigated by coupling measured rock properties with an enhanced FEFLOW simulation. Methods: The finite element model has been validated against measured data from a 2-year operation period. The thermal changes in the subsurface have been predicted by simulation for a 30-year operation period. The model is based on three 80-m core sections drilled in Triassic carbonates, which have been analyzed in detail with respect to lithology, facies, and thermal and hydraulic parameters. Results: The model shows thermal effects of the BTES on the subsurface at a distance of approximately 350 m after 10 years and a distance of approximately 850 m after 30 years of operation. At a distance of 100 m, the temperature of the subsurface rises by 2 K after 30 years. Conclusions: The simulation describes the real BTES in an accurate manner and is suited for predicting the thermal changes in the subsurface for long-term operational durations.

KW - borehole thermal energy store

KW - borehole heat exchanger system

KW - heat and mass trasnport model

KW - geothermal parameters

KW - Triassic carbonates

U2 - 10.1186/s40517-014-0005-1

DO - 10.1186/s40517-014-0005-1

M3 - Article

VL - 2

JO - Geothermal Energy

JF - Geothermal Energy

IS - 1

ER -

Thermal effect of a borehole thermal energy store on the subsurface

Abstract

UN SDGs

Keywords

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