Thermal conductivity up to 100 m — grids (Lambda)

The thermal conductivity maps of the Flemish subsurface, commissioned by the Department of Land and Soil Protection, Underground and Natural Resources, give the thermal conductivity of the Flemish subsurface to a depth of 100 m or up to the solid rock. This assignment aims to analyse the missing geological formations, compared to an earlier assignment in 2004, and to seek a refinement of the suitability map for the use of vertical probes for energy extraction and energy storage. The database was expanded by determining the thermal conductivity of 10 other formations that have not yet been studied. In this way, a good insight can be gained into the thermal conductivity of the shallow subsoil of Flanders, in such a way that it should also be possible to draw up a more refined suitability map of the Flemish subsurface for cold-heat storage and borehole energy extraction. These maps are grid cards (grids) that represent the average, minimum and maximum mean thermal conductivity of the Flemish subsurface in cells from 100 to 100 m. The minimum average thermal conductivity over a depth of 100 meters is 1.6 W/mK, the maximum 3.0 W/mK.