More than 50 percent of total energy consumption in Germany is used for heating and cooling, in private households it is even more than 80 percent of total energy consumption. In the context of the " Energiewende", the transition to a renewable energy supply, geothermal energy can therefore play a key role in the heating and cooling of buildings.
To heat and cool buildings, heat is extracted from the ground (or stored in the ground) e.g. via geothermal doublets and borehole heat exchangers, also known as open and closed systems. The design of such a geothermal system depends heavily on the geothermal potential of a particular site. For example, the thermal properties of the rocks underground and the thickness and depth of aquifers strongly influence the geothermal potential. The design of a geothermal system therefore requires different types of geological and hydrogeological subsurface data. Unfortunately, Germany does not yet have a uniform database with the necessary information. Both data availability and data quality vary greatly in the individual german federal states.
In this project, we are therefore developing "TherMap", a uniform geothermal online database from which we are able to calculate the geothermal potential at a given location, including its uncertainties. A corresponding geographic information system (GIS) visualizes the results of the calculation and thus provides a planning basis for the dimensioning of borehole heat exchangers as a future-oriented heating and cooling solution for buildings.