| Title | The Reutilization of the Dannenbaum Coal Mine for Heating and Cooling of the Redeveloped Commercial Area Mark 51.7 with Mine Water |
|---|---|
| Authors | Gregor BUSSMANN, Florian HAHN, Felix JAGERT, Rolf BRACKE |
| Year | 2020 |
| Conference | World Geothermal Congress |
| Keywords | Reutilization, abandoned mines, mine water, low-ex, directional drilling, heating and cooling, district heating |
| Abstract | It is planned to provide the heating and cooling supply for the redeveloped commercial area Mark 51 ° 7 (former Opel plant 1) by using the thermal source of mine water from the abandoned colliery Dannenbaum, that is located below the area. After the closure of the Dannenbaum colliery (1859 - 1958), the shafts were filled and the mine was flooded to above the Level 4, up to approx. -190 m above sea level. For the realization of mine water utilization, the subsurface infrastructures of the former Dannenbaum colliery are to be developed via production and injection wells using directional drilling technology. For the heat supply, a well is to be drilled into the 8th level at -693 m NN with projected undisturbed temperature of about 37°C. For the cooling a second well is to be drilled into the 4th level at a depth of 334 m below ground with predicted temperatures of around 19°C. The necessary measures for the project are: 1) a low-temperature heating network (low-ex), 2) a cooling network for room cooling and air conditioning, 3) the mine development via two or more directional boreholes and 4) a heating and cooling center with reversible heat pump system. The heat pump system should provide 80% of the required annual heat requirement and 100% of the annual cooling requirement. The remaining 20% of the peak heat requirement is exceeded by the upstream local heating network provided nearby. The proposed mine water usage for heating and cooling supply has not been realized in Germany so far. At this stage of the project it is estimated that the customers will demand a heating power of 9,7 MW respectively a heat supply of 11,9 GWh/a and a cooling power of 7,6 MW respectively a cooling supply of 5,3 GWh/a for the supply of 45 buildings. |