Geothermal Supply of the Development Phoenix-Sea in Dortmund
Prof. Dr. R. Bracke
Prof. Dr. C. Clauser
Prof. Dr. T. Rüde
Dipl.-Geophys. G. Bussmann
Dr. R. Pechnig
Dortmunder Energie- und Wasserversorgung GmbH
As an integrated project the city of Dortmund currently develops the industrial sites of a former steel plant in the district Hörde. A core area is the 96 ha large eastern segment which comprises the Phoenix-Sea with various water and recreation related purposes. Adjacent to the 25 ha water body areas are developed for attractive living according to the Dutch canal style, for office and service functions and for recreational ideas as well as for hotels and gastronomic businesses. The revitalisations of the fallow land will generate 900 to 1300 new apartments, which are designed as multifamily residences, terraced houses and semi-detached as well as detached houses.In the western part of the development, which comprises 5 ha, areas for commerce and public services are supplied.
The project is developed by the municipally utility of Dortmund which asked the GeothermalCenter to conduct a study concerning the geothermal energy supply of the mentioned development. Aim of this study is the system simulation in relation to the subsurface geophysical and geological parameters present at the site. Further factors, such as urbanistic, building physical and supply technological aspects, are included.
First the evaluation of existing geological maps and boreholes, the drilling of cores at relevant geological outcrops and the determination of the thermophysical stone properties are projected.
Based on the findings of this first step geothermal simulation calculations of two near-surface systems (250 m and 500 m) and two deep systems (1,000 m and 2,300 m) for different operational purposes are conducted.
The calculated extraction rate influences the design of the geothermal plant in relation to the building-side demand profiles and the economical considerations.
Due to a range of former mining activities on the development site the effects of stone deformation on the geothermal heat exchanger equipment is evaluated.