18 MW geothermal heat pump station for Innargi (DK)

Aalborg CSP has partnered with the Danish geothermal heating company, Innargi, to supply an integrated heat pump station of approx. 18 MW for a large geothermal project in Aarhus, Denmark.

Customer need

Both Innargi and the Danish utility company Kredsløb have recognized the potential of using geothermal energy for district heating purposes and have therefore entered into a collaboration to bring geothermal heating to the city of Aarhus. The parties are currently working on a project that, when completed, will consist of 14-17 geothermal wells distributed across seven locations in Aarhus. With a total capacity of 110 MW, the geothermal system will cover up to 20% of the district heating need within the Kredsløb supply area. This is equivalent to the annual heat consumption of 36,000 households.

Plant description

Aalborg CSP has designed a modular hydrocarbon-based heat pump, capable of handling the - at times - fluctuating flow of the geothermal water while delivering the desired high supply temperature. The complete heat pump station in Skejby will be able to provide up to 18 MW of heat and a temperature of up to 95° C to the local district heating network.

In addition to a heat pump station optimized for geothermal energy, it has been crucial to design and construct a building standard as well as an optimized design for the technical installations that both Innargi and Kredsløb can utilize for future geothermal plants.