The GRETA project is co-financed by the European Regional Development Fund through the Interreg Alpine Space programme.

Open‐loop potential

estimation for

energy planning

07th November 2017 – F. Böttcher – TUMGRETA Midterm conference, Salzburg

GERMANY/Sonthofen

07/11/20172

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+ Monitoring of two geothermal railway switch heating systems

+ Installation of sensors for soil temperature profile measurement

+ Numerical modelling of a geothermal railway switch to study performance optimization options

+ Detailed hydraulic conductivity evaluation of 38 pumping tests in the area of Sonthofen

+ Economic feasibility study on geothermal systems for kindergartens in the Oberallgäu

+ Heat pump user interviews to reveal practical experiences

+ Training course on shallow geothermal energy for local energy consultants

+ Geologic 3D-modelling of the hole Upper Iller valley

+ Reference date measurement of all available wells in the Upper Iller valley aquifer

Case study actions

Actions to foster shallow geothermal energy in the Oberallgäu / Sonthofen:

07/11/20173

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State of the art in Bavaria

Shallow geothermal energy information platform:

+ Detailed potential maps for closed loop systems

+ Drilling risks

+ Lithology

+ Extraction values

No information for groundwater heat pumps!

07/11/20174

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Upper Iller Valley - Sonthofen

07/11/20175

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The steps towards Open-loop potentials

1. Basic hydrogeological questions

2. Questions in open loop potential assessment+ How large can we design groundwater heat

pumps (GWHP)?

+ How densely can we install sustainable GWHP-systems?

07/11/20176

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The geology

Input data for the geologic 3D-Modell:

+ Three detailed diploma mapping campaigns

+ Geological cross sections

+ Huge amount of borehole logs

+ Seismic refraction traverses

07/11/20177

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The geology

07/11/20178

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Groundwatertable

Aquifer thickness

Groundwatertemperature

07/11/20179

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Volume flux potential

07/11/201710

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Thermal potential

07/11/201711

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Outlook: The practical need

Future development areas in Sonthofen:• Am Illerdamm / Tennis Courts• Hirnbeinstr. / Hindelanger Str. • Promenadestr. • Stadionweg• Grüntenkaserne• Jörgwiese• Jägerkaserne

Ongoing exchange with the city of Sonthofen to use the new data in future building projects!

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Thank you!