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| Titel |
Medium Deep High Temperature Heat Storage |
| VerfasserIn |
Kristian Bär, Wolfram Rühaak, Daniel Schulte, Bastian Welsch, Swarup Chauhan, Sebastian Homuth, Ingo Sass |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250106627
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| Publikation (Nr.) |
 EGU/EGU2015-6305.pdf |
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| Zusammenfassung |
| Heating of buildings requires more than 25 % of the total end energy consumption in
Germany. Shallow geothermal systems for indirect use as well as shallow geothermal heat
storage systems like aquifer thermal energy storage (ATES) or borehole thermal energy
storage (BTES) typically provide low exergy heat. The temperature levels and ranges
typically require a coupling with heat pumps.
By storing hot water from solar panels or thermal power stations with temperatures of up to
110 °C a medium deep high temperature heat storage (MDHTS) can be operated on relatively
high temperature levels of more than 45 °C. Storage depths of 500 m to 1,500 m below
surface avoid conflicts with groundwater use for drinking water or other purposes.
Permeability is typically also decreasing with greater depth; especially in the crystalline
basement therefore conduction becomes the dominant heat transport process. Solar-thermal
charging of a MDHTS is a very beneficial option for supplying heat in urban and rural
systems.
Feasibility and design criteria of different system configurations (depth, distance and number
of BHE) are discussed. One system is designed to store and supply heat (300 kW) for an
office building. The required boreholes are located in granodioritic bedrock. Resulting from
this setup several challenges have to be addressed. The drilling and completion has to be
planned carefully under consideration of the geological and tectonical situation at the specific
site. |
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