Analytical solution; Borehole heat exchanger; Experimental platform; Groundwater flux; Intrinsic thermal conductivity; Temperature plume; Borehole heat exchangers; Ground layer; Groundwater fluxes; Temperature evolution; Thermally activated; Volumetric heat capacity; Renewable Energy, Sustainability and the Environment
Abstract :
[en] A methodology to characterize the main hydro-geothermal parameters of saturated and unsaturated ground layers, such as intrinsic thermal conductivity, volumetric heat capacity and groundwater velocity is proposed, based on the monitoring of the temperature plume around an activated borehole heat exchanger (BHE). The methodology is applied on an experimental platform composed of four BHEs. Based on the expected lithology and approximative groundwater fluxes direction, one BHE is thermally activated with a pre-determined heat injection and duration. The temperature evolution is recorded by means of PT100 sensors in the activated BHE and in the three non-activated BHEs, at three different depths in the saturated and unsaturated domain of an unconfined aquifer crossed by the BHEs. From an analytical solution considering conductive, advective and dispersive heat transfers, the hydro-geothermal parameters of the ground are obtained by fitting the measured to the predicted temperatures evolution. The effect of the possible inclination of the measuring boreholes is evaluated with the analytical solution. The obtained hydro-geothermal parameters demonstrate the important role of the saturated aquifer that significantly enhances the apparent thermal conductivity of the ground and, in case of groundwater flows, induces an anisotropic propagation of the temperature plume.
Disciplines :
Civil engineering
Author, co-author :
Gigot, Valériane ; Université libre de Bruxelles (ULB), Building, Architecture and Town Planning Dept (BATir), Laboratoire de GéoMécanique, Brussels, Belgium ; Department of Hydrology and Hydraulic Engineering, Vrije Universiteit Brussel, Brussels, Belgium
François, Bertrand ; Université de Liège - ULiège > Urban and Environmental Engineering ; Université libre de Bruxelles (ULB), Building, Architecture and Town Planning Dept (BATir), Laboratoire de GéoMécanique, Brussels, Belgium
Huysmans, Marijke ; Department of Hydrology and Hydraulic Engineering, Vrije Universiteit Brussel, Brussels, Belgium
Gerard, Pierre ; Université libre de Bruxelles (ULB), Building, Architecture and Town Planning Dept (BATir), Laboratoire de GéoMécanique, Brussels, Belgium
Language :
English
Title :
Monitoring of the thermal plume around a thermally activated borehole heat exchanger and characterization of the ground hydro-geothermal parameters
ERDF - European Regional Development Fund [BE] Région de Bruxelles-Capitale [BE]
Funding text :
This work was supported by the European Regional Development Fund (EDRF) and the Brussels Capital Region in the frame of the project F31-03 “Brugeo”. The authors would like also to thank Fabiano Pucci and Nicolas Canu for their valuable support for the experimental developments performed on the experimental platform.
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