Numerical studies on underground thermal energy storages

Julian Schleicher, Islam Marzouk*, Matthias Rebhan, Franz Tschuchnigg

*Korrespondierende/r Autor/-in für diese Arbeit

Publikation: Beitrag in Buch/Bericht/KonferenzbandBeitrag in einem KonferenzbandBegutachtung

Abstract

The ever-increasing global energy consumption leads to a rise in demand for re-newable energy sources and storage solutions. Nevertheless, in several cases en-ergy is not sufficiently stored and dissipates unused (e.g., waste heat from air conditioning systems). This results in increasing the air temperature, especially in urban areas. Underground thermal energy storage (UTES) systems can be used to utilize underground soil to store unused energy for use when needed (e.g., dis-trict heating). The objective of this paper is to investigate the implementation of a UTES system in the 2D finite element software PLAXIS. Furthermore, the mod-elling approach used for thermally insulating the storage tank by using improved diaphragm walls was evaluated.
In case of a UTES system, it is necessary to model a heating phase in which the storage stores energy for later use. For this purpose, different modelling ap-proaches were investigated. Each analysis aimed to heat the storage reservoir to 90°C. Afterwards, the difference in temperature distribution in the soil was inves-tigated.
Moreover, the influence of the thermal properties of the diaphragm walls on the temperature distribution was reviewed. Concrete with a density of 2,400 kg/m³ was compared to a lightweight concrete developed at the Institute of Structural Concrete at Graz University of Technology. The thermal properties of the light-weight concrete were determined based on laboratory tests. The lightweight con-crete had a thermal conductivity of 1.026 W/mK, which led to a significant reduc-tion in heat losses from the storage.
Originalspracheenglisch
TitelRecent Research on Geotechnical Engineering, Remote Sensing, Geophysics and Earthquake Seismology
UntertitelProceedings of the 2nd MedGU, Marrakesh 2022 (Volume 3)
Herausgeber (Verlag)Springer
Seiten83-86
Seitenumfang5
PublikationsstatusVeröffentlicht - 2024
VeranstaltungMedGU-22 - Marrakech, Morocco, Hybrider Event, Marokko
Dauer: 27 Nov. 202230 Nov. 2022
https://www.medgu.org/

Publikationsreihe

NameAdvances in Science, Technology & Innovation

Konferenz

KonferenzMedGU-22
KurztitelMedGU-22
Land/GebietMarokko
OrtHybrider Event
Zeitraum27/11/2230/11/22
Internetadresse

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