Bastesen E

Chicco J

Giordano N

Mandrone G

Wheeler W

English

PORTO@iris (Publications Open Repository TOrino - Politecnico di Torino)

18 October 2022POLITECNICO DI TORINORepository ISTITUZIONALEThermo-hydraulic characterization of a fractured shallow reservoir in Bergen (Norway) to improve the efficiency of a BHEfield / Mandrone, G; Giordano, N; Bastesen, E; Wheeler, W; Chicco, J. - In: GEOPHYSICAL RESEARCH ABSTRACTS.- ISSN 1607-7962. - ELETTRONICO. - (2017). ((Intervento presentato al convegno European Geosciences Union(EGU), General Assembly 2017 tenutosi a Vienna, Austria nel Aprile 2017.OriginalThermo-hydraulic characterization of a fractured shallow reservoir in Bergen (Norway) to improve theefficiency of a BHE fieldPublisher:PublishedDOI:Terms of use:openAccessPublisher copyright(Article begins on next page)This article is made available under terms and conditions as specified in the  corresponding bibliographic description inthe repositoryAvailability:This version is available at: 11583/2915480 since: 2021-07-27T22:52:36ZCopernicusGeophysical Research AbstractsVol. 19, EGU2017-18581, 2017EGU General Assembly 2017© Author(s) 2017. CC Attribution 3.0 License.Thermo-hydraulic characterization of a fractured shallow reservoir inBergen (Norway) to improve the efficiency of a BHE fieldGiuseppe Mandrone (1), Nicolò Giordano (1), Eivind Bastesen (2), Walter Wheeler (2), and Jessica Chicco (1)(1) Dept. Earth Science, University of Torino, 10125 Torino, Italy (giuseppe.mandrone@unito.it), (2) Uni Research CIPR,Allégaten 41, 5008 Bergen, NorwaySustainable thermal energy production from GSHP systems is greatly dependent on the thermo-hydraulic field, yetthere are few realistic case studies which capture the dynamics of such systems. Here we present initial work onthe static model for one such case example. A BHE field consisting of 12 ground heat exchangers in fractured crys-talline rock has been supplying thermal energy for the past 20 years to meet the heating needs of a school locatedin Bergen, Norway. In recent years the heat pump COP has significantly decreased, which has been ascribed to adepletion of the extractable energy surrounding the BHEs, that is, by extracting more energy in the heating seasonthan is naturally replaced in the summer. A numerical model of the underground is constructed to show the thermaldepletion and determine a sustainable thermal use of the shallow reservoir (0-200 m). At this stage, the modelrepresents the geology and structure of the underground, which consists of metamorphic rocks of the NordåsvatnetComplex (Minor Bergen Arc, Ordovician): amphibolites, micaschists, augen gneisses and quartz-schists depict thefirst 200 m below ground level. Preliminary well tests in some of these BHEs showed how complex and hetero-geneous is the hydrogeological field. Some wells are clearly connected, others show hydraulic head difference ofmore than 15 m even though they are close by. Future flow tracer tests and down-hole fracture characterizationwill be carried out for in-depth representation of the flow field. Here we present and discuss laboratory thermalmeasurements on samples collected in the area, especially a comparison of two thermal conductivity measure-ment techniques. Thermal conductivity measurements were carried out with the thermal conductivity scanner byLippmann and Rauen GbR and with the KD2 Pro by Decagon Devices. The optical scanning technology and thetransient line source method were therefore compared to get the most valuable results. Electrical resistivity andseismic wave measurements were also performed on some samples to investigate possible relationships betweenthese physical properties.

Thermo-hydraulic characterization of a fractured shallow reservoir in Bergen (Norway) to improve the efficiency of a BHE field

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Thermo-hydraulic characterization of a fractured shallow reservoir in Bergen (Norway) to improve the efficiency of a BHE field

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