Geothermal Energy Supply of Hattingen Südstadt
Prof. Dr. R. Bracke
Prof. Dr. M. Brodmann
Prof. Dr. C. Clauser
Prof. Dr. G. Höfker
Dipl.-Ing. (FH) K. Winkler
Dipl.-Geophys. G. Bussmann
Dipl.-Geophys. R. Weidler
HWG Hattinger Wohnstätten eG
The Wohnungsbaugesellschaft Hattingen (HWG - housing society of Hattingen) projects in cooperation with the city council of Hattingen a new orientation of the urbanistic development of the city’s district "Südstadt" which originally was built in the fifties and sixties with approximately 1,200 apartments.
The re-design comprises the new construction of barrier-free apartments as well as the comprehensive re-modelling of the floor plans and the equipment of the existing buildings. Furthermore it is strived at the modernisation of the infrastructural systems. Current sustainability benchmarks, including those for comfort, economy and environment, are not met by the heating plants. Therefore their replacement by a heat supply concept according to future standards is aimed at.
The GeothermalCenter develops - according to this vision - options for the geothermal heat supply and conducts studies dealing with feasibility aspects and the potential of economic realisation.
The feasibility study is subdivided into two parts:
The first part evaluates different variations of geothermal heating and cooling systems. Under investigation are properties linked with the geology, the drilling technology and the building physics of one hole systems with varying depths between 400 and approximately 3,500 m (closed loop or open loop systems based on single hole approaches).
Significant contents of the study are, furthermore, computer-aided dynamical simulations of the energy exploration and storage in relation to the heating and cooling demand of the modernised building stock as well as the energy distribution in low temperature and cool grids.
In the second part of the feasibility study an estimation of the basic adequacy of the site in Hattingen for the simulated large scale geothermal plant is delivered. Amongst other issues the potential for a “hot-fractured-rock” (HFR) stimulated geothermal heat development is analysed. Using the HFR technology the hot but dry stone in great depths is developed as a large-volume subsurface heat exchanger. This is achieved by the hydraulic fracturing of the stone.