Use of Shallow Geothermal Energy

Abstract

The underground in the first approx. 100 m is well suited for supply and storage of thermal energy. The climatic temperature change over the seasons is reduced to a steady temperature at 10-20 m depth (Figure 1), and with further depth temperatures are increasing according to the geothermal gradient (average 3°C for each 100 m of depth). Figure 1. Underground temperatures from a borehole south of Wetzlar, not influenced by the heat pump operation.