Numerical predictions for underground thermal energy storage experiment in the Otaniemi research tunnel

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en Janiszewski, Mateusz Caballero Hernandez, Enrique Siren, Topias Uotinen, Lauri Rinne, Mikael
dc.contributor.editor Johansson, Erik
dc.contributor.editor , Ville Raasakka 2018-02-09T10:01:58Z 2018-02-09T10:01:58Z 2017-10-11
dc.identifier.citation Janiszewski , M , Caballero Hernandez , E , Siren , T , Uotinen , L & Rinne , M 2017 , Numerical predictions for underground thermal energy storage experiment in the Otaniemi research tunnel . in E Johansson & V R (eds) , 3rd Nordic Rock Mechanics Symposium NRMS 2017 : Symposium Proceedings . RIL / Suomen rakennusinsinöörien liitto , Suomen rakennusinsinöörien liitto RIL , pp. 77-85 , Nordic Rock Mechanics Symposium , Helsinki , Finland , 11/10/2017 . en
dc.identifier.isbn 978-951-758-622-1
dc.identifier.other PURE UUID: 92664a1e-bce5-4a3b-947d-1771a26d22a6
dc.identifier.other PURE ITEMURL:
dc.identifier.other PURE LINK:
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dc.description.abstract Seasonal storage of solar thermal energy is an attractive way to utilise the underground space to increase the share of renewables and tackle the global challenge of climate change. One of the methods to store the solar energy is the borehole thermal energy storage (BTES), where the thermal energy is stored in the rock mass using borehole heat exchangers. This study presents preliminary results of numerical predictions for an in situ experiment of underground thermal energy storage in the research tunnel under Otaniemi campus. The in-situ experiment site consists of two horizontal boreholes of 5 m length drilled into granitic rock. One borehole is equipped with a single U-tube heat exchanger, and the hot water is circulated through it to heat up the rocks, while the second hole is used for temperature measurement of the rock. The in situ experiment set-up is modelled numerically using finite element method to investigate the influencing factors and predict its long-term thermal performance. The three-dimensional problem is solved with the transient heat conduction equations and the temperature distribution in the subsurface is obtained during 21 days of operation. A parametric study is performed to find the optimal operating conditions. The results of the numerical predictions are used for a detailed plan of the experiment. The simulated results will be later compared to the measured values obtained in the experiment. en
dc.format.extent 9
dc.format.extent 77-85
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation.ispartof Nordic Rock Mechanics Symposium en
dc.relation.ispartofseries 3rd Nordic Rock Mechanics Symposium NRMS 2017 en
dc.rights openAccess en
dc.subject.other Geology en
dc.subject.other Geophysics en
dc.subject.other Geotechnical Engineering and Engineering Geology en
dc.subject.other 1171 Geosciences en
dc.title Numerical predictions for underground thermal energy storage experiment in the Otaniemi research tunnel en
dc.type A4 Artikkeli konferenssijulkaisussa fi
dc.description.version Peer reviewed en
dc.contributor.department Department of Civil Engineering
dc.subject.keyword Underground Thermal Energy Storage
dc.subject.keyword numerical modelling
dc.subject.keyword in situ experiment
dc.subject.keyword borehole heat exchanger
dc.subject.keyword Geology
dc.subject.keyword Geophysics
dc.subject.keyword Geotechnical Engineering and Engineering Geology
dc.subject.keyword 1171 Geosciences
dc.identifier.urn URN:NBN:fi:aalto-201802091404
dc.type.version acceptedVersion

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