Conducibilità termica distribuita da un test di risposta termica (TRT) su una sonda geotermica

The Thermal Response Test (TRT) is the most versatile tool to determining the thermal propriety of the underground for design and sizing of the borehole heat exchangers (BHE). The TRT permits to get the average thermal conductivity (λ) across the whole stratigraphy, the thermal resistance (Rb) of the borehole / grout / rocks and the temperature undisturbed of the soil (Tg). The ground temperature is influenced by climate, topographical, geological and hydrological factors. Vertical temperature log allow get the relation-ships with the lithology and especially with the groundwater. Verti-cal temperature log, acquired during and after the TRT, permit to calculate a distribute thermal conductivity over each stratigraphic interval. This method permits to verify how the different lithologies and the groundwater contribute to the heat exchange in the borehole/ground system, so called geoexchange. The experimental site test in-dicate that the marls and clayed-marls levels had a thermal inertia respect the sandstone with lower value of thermal conductivity. The sandstones had a higher thermal conductivity with a rapid cooling and give the main contribute to the ground heat exchange. The dis-tribute thermal conductivity is an useful tool for to design the BHE with the best performance, a better economic return and with low environmental impacts. Thermal conductivity distributed from a Thermal Response Test (TRT) in a borehole heat exchanger (BHE). Available from: https://www.researchgate.net/publication/303956819_Thermal_conductivity_distributed_from_a_Thermal_Response_Test_TRT_in_a_borehole_heat_exchanger_BHE