Seasonal High Temperature Heat Storage with Middle Deep Borehole Heat Exchangers–a Coupled-Modeling Study

摘要: More than 50% of the overall energy demand in Germany is due to heating and cooling purposes. Therefore, groundbreaking techniques are needed to save energy and reduce greenhouse gas emissions especially in this low exergy sector. The combination of different renewable energy sources–eg solar thermal and geothermal–with already existing district heating systems fed by combined heat and power stations (CHP) is a promising new approach.In summer, excess solar thermal energy is available, while in winter, when thermal energy is needed for heating systems, its quantity is usually not sufficient. There are different options to cope with the seasonal offset of thermal energy supply and demand. Besides conventional storage tanks at the surface, thermal storage in shallow aquifers and shallow borehole thermal energy storages (BTES), geothermal heat storage in medium depths is an innovative and yet …