Renewable energy production results in excess heat production during the summer in Denmark. This can be used in the municipal district heating system in winter, provided seasonal storage is available. Injection of heated water into sandstone aquifers that are currently exploited for geothermal energy is a promising potential storage method. The in-situ temperatures reduce heat loss from the injected hot water. 

Injection of hot water may cause damage to the formation. Geochemical reactions can lead to mineral precipitation or dissolution which affects both the storage capacity of the formation and the ease with which fluids can be injected or extracted.



Heat Storage in Hot Aquifers (HeHo)

Research is being conducted to assess potential effects of heating the rock and to evaluate which formations are most suitable for heat storage. Geomechanical tests are performed to determine whether the strength and stiffness of the rock are affected by heat storage. Geochemical tests are performed in collaboration with GEUS to investigate interactions between the fluid and the rock at temperatures and pressures similar to those in the aquifer.


Completed PhD Projects

The Effect of Temperature on the Rock Physical Properties of Sandstone

Part of: Heat Storage in Hot Aquifers (HeHo)

PhD Student Esther Rosenbrand



Ida Lykke Fabricius (contact person)


Ida Lykke Fabricius
Professor, head of section
DTU Civil Engineering
+45 45 25 21 62