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Combination of borehole heat exchangers and air sparging to increase geothermal efficiency
Publikationstyp
Conference Paper
Date Issued
2013
Sprache
English
Author(s)
Institut
TORE-URI
Start Page
3355
End Page
3358
Citation
Challenges and innovations in geotechnics : proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering : Paris 2013 / edited by/sous la direction de Pierre Delage, Jacques Desrues, Roger Frank, Alain Puech, François Schlosser ; CFMS, ISSMGE. - Paris : Presses des Ponts. - Vol. 4 (2013). - Seite 3355-3358
Contribution to Conference
Scopus ID
Closed and open systems are available for the usage of shallow geothermal energy. In closed systems heat can only be transferred conductively for the case of no groundwater flow. Unfortunately heat conduction is a relatively slow heat transfer mechanism, which causes limited heat-abstraction capacities in geothermal systems. A patented method is presented, in which a closed system is combined with groundwater-circulation technology. In this way a groundwater circulation will be created artificially, which increases convective heat transfer in the soil and therefore the heat capacity of the geothermal system. In this paper a borehole heat exchanger combined with an air sparging well is numerically simulated. The induced groundwater circulation and the heat propagation are calculated sequentially. The heat capacity of this system is compared to a normal borehole heat exchanger. Furthermore, variation calculations are performed to investigate the influence of density of the water-air-mixture in the well, permeability and hydraulic conductivity of the soil. A profitability analysis is carried out based on the numerical results.
Subjects
Air sparging
Induced groundwater flow
Numerical simulations
Shallow geothermal energy
DDC Class
550: Geowissenschaften
620: Ingenieurwissenschaften
690: Hausbau, Bauhandwerk