Abstract
Since the 1980’s, shallow geothermal solutions have been developed whose principle is to attach heat exchange pipes to the reinforcing cages of geotechnical structures. These low energy solutions combining a structural and a thermal role allow the fulfilling of the heating and cooling needs of buildings for a very low carbon cost. Energy geostructures are often placed in a groundwater flow. On one hand, it is a good way to avoid any multiyear thermal shift since the heat excess or default is tempered through the advection. This advection creates a thermal plume and heat waves in the soil can interact with downstream structures whose behaviour can be affected. The understanding of these interactions is essential for a smart management of the shallow geothermal development at the city scale. To study these interactions, a group of nine energy piles has been studied in Sense City, a mini city where a specific climate can be imposed and the underground water flow can be controlled. A numerical hydraulic-thermal coupled model was developed with the FEM software CESAR-LCPC to extrapolate the results. The combination of experimental and numerical models provides helpful results for the definition of guidelines concerning the prevention of interactions.
Highlights
The increasing energy needs in urban areas as well as the environmental imperatives have led the international research community and industry to develop new power supply technologies
The global behaviour in the neighbourhood of the piles is stabilized after 3 heating and cooling cycles and the thermal plume reaches the boundary during the fifth day
The study of an energy pile group immersed in a groundwater flow and the interactions between theses piles due to the advection were presented
Summary
The increasing energy needs in urban areas as well as the environmental imperatives have led the international research community and industry to develop new power supply technologies. Advection along the flow can regulate the potential multi-year temperature drift of the ground due to an excess heating or cooling [7, 8, 9, 10] This advection produces a thermal plume and heat waves in the ground which may interact with downstream geostructures, impacting their thermal behaviour and surrounding groundwater flow velocity profiles [11, 12]. The thermomechanical behaviour of a single energy geostructure has been characterized through many research works but interactions between neighbouring geostructures have yet to be studied This knowledge is critical to manage wisely those geothermal solutions at a district or city scale [13]. The scope of the following work is to provide physical modelling and simulation tools necessary to this kind of
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