Development of the Geothermal Field "Nordlicht" in Bottrop

Project Participants:

Prof. Dr. R. Bracke
Prof. Dr. C. Clauser
Dipl.-Ing. (FH) K. Winkler
Dr. R. Pechnig


GEBIG Immobilien- und Projektentwicklung GmbH

The city council of Bottrop decided to disclose the development plan no. 48 for the district Kirchhellen. On an area of 25 ha approximately 600 appartments are planed to be developed, inlcuding multifamily residences,  terraced houses and semi-detached as well as detached houses. Furthermore infrastructural objects, such as a shopping centre and a youth centre, are included. The development is subdivided into several sections, which are realised in successive manner within a period of 10 years.

With the city council's decision geothermal heat supply is anchored in a town planning policy for the first time in Germany.

In the scope of this project the GeothermalCenter analyses the technical and economical feasibility of the geothermal energy supply of this development. Dynamical simulations link the aspects of the building physics, the supply technology, the local heat grid and the geophysics directly with each other.

To develop a practical and realisable energy supply concept a “growing” heat grid for units of 5 apartments each has been chosen.

In order to smooth the geothermal demand profiles a combination of geothermal plant components with long term heat storage and various alternatives of building equipments (with / without ventilation plant, with / without thermally activated construction elements) is simulated.

The constructive units can be combined with each other to various scales. The simulation of the geothermal extraction potential was conducted for systems close to the surface (250 m and 400 m) and two deep geothermal systems (1,000 m and 2,300 m).

Based on the simulation results important information to determine the proportion of geothermal energy supply and building-side energy demand were delivered. With this data significant findings concerning the project’s economy have been concluded.

Zusätzliche Information

planning statistics:
housing area 13.4 ha
traffic area 5.5 ha
public green 4.7 ha
mixed area 0.6 ha
Results of the thermal building simulation for five terraced houses: three houses with underfloor heating (UFH) and window ventilation; one house with UFH and ventilation plant including heat recovery and one house with thermally acitve concrete ceilings and ventilation plant including heat recovery

Simulation results of a 2,300 m deep geothermal well, simulation period: 6 months, flow rate 8 m³/h, daily operation 8 h, thermal power 198 kW