Seasonal energy extraction and storage by deep coaxial borehole heatnexchangers in a layered ground

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985891%3A_____%2F24%3A00599734" target="_blank" >RIV/67985891:_____/24:00599734 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1016/j.renene.2024.121530" target="_blank" >https://doi.org/10.1016/j.renene.2024.121530</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.renene.2024.121530" target="_blank" >10.1016/j.renene.2024.121530</a>

Result language

angličtina

Original language name

Seasonal energy extraction and storage by deep coaxial borehole heatnexchangers in a layered ground

Original language description

Geothermal energy extraction and storage through boreholes have garnered significant attention, particularly regarding deep coaxial borehole heat exchangers. They can be modeled as linear systems if the water flownrate remains constant. The amplitude and phase shift of the transfer functions between the energy output of the exchanger and the thermal changes in the flowing water can be established analytically, provided thatnthe operating regime is periodic over time. We begin by presenting a theoretical framework for a borehole situated in a homogeneous layer and subsequently extend the theory to a layered ground model using a matrixnmethod. The applicability of our approach is demonstrated over operational periods of up to one year for typical exchangers with a radius of 0.2 m, reaching depths from several hundred meters to 1 km. Temperature variations of several degrees Kelvin in the inflowing water are associated with storage and extraction power amplitudes of several kilowatts for a 1 km deep borehole. We illustrate how the ratio between power and temperature amplitudes varies with changes in borehole radius and depth. Furthermore, we show that for very deep boreholes extending to a depth of 4 km, the borehole heat exchangers reach their maximum storagencapacity.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20704 - Energy and fuels

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Renewable Energy

ISSN

0960-1481

e-ISSN

1879-0682

Volume of the periodical

237

Issue of the periodical within the volume

December

Country of publishing house

GB - UNITED KINGDOM

Number of pages

16

Pages from-to

121530

UT code for WoS article

001341069900001

EID of the result in the Scopus database

2-s2.0-85206628918