Development of a pilot site for high temperature heat pumps, with high temperature mine thermal energy storage as heat source

A pilot plant for high temperature heat pumps (HTHP’s) combined with high temperature mine thermal energy storage (HT-MTES) is developed at the Fraunhofer IEG location of Bochum. The aim of the plant is to inject renewable heat into the district heating (DH) grid. The HT-MTES is a seasonal thermal storage: heat is injected during the summer and successively extracted during the cold season. A HTHP, hydraulically connected to the storage, transfers heat to the DH grid.