Clemens Lehr

Dipl.-Geol. Clemens Lehr

Working area(s)

  • Shallow Geothermal Energy

More information

Geotechnisches Umweltbüro Lehr
Rießstrasse 10
61231 Bad Nauheim

06032 32343

06032 32353

Dissertation

Evaluation of thermal response tests using a cylinder source approach (Type Curve Fitting Method)

A Thermal Response Test or Geothermal Response Test (TRT or GRT) is a field method to investigate thermo-physical properties of a borehole heat exchanger (BHE) drilled into soft or hard rocks. The resulting TRT temperature graph is demonstrating the relation between the injected heat energy and the thermal rock properties. This project addresses a quantitative approach to evaluate TRT data with an unsteady state solution following the cylinder source theory. Similar to groundwater pump test results, the early TRT phase behaviour shows especially the level of disturbance of the drilled BHE and requires an evaluation of the unsteady state period. The starting hours represent influences of the borehole grout, formation damage and water movement by thermal gradients. Furthermore, the numerical modelling of BHE fields is becoming more precise if the volumetric heat capacity can be introduced. Using the Type Curve Method, it is also possible to evaluate measurements with non stable heat input conditions by time based superposition.

Publications

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Gruppiere nach: Publikationsjahr | Typ des Eintrags | Keine Gruppierung
Springe zu: 2016 | 2015 | 2014 | 2013
Anzahl der Einträge: 7.

2016

Sass, I. ; Lehr, C. ; Egert, R. ; Heldmann, C.-D. ; Schäffer, R. (2016):
Design Parameters for Middle Deep Borehole Exchanger Storage Systems.
In: GeoTirol 2016 Annual Meeting DGGV, Innsbruck, 25.–28.09.2016, [Konferenzveröffentlichung]

Sass, I. ; Heldmann, C.-D. ; Lehr, C. (2016):
Erschließung eines Marmorkarstvorkommens als mitteltiefer Erdwärmesondenspeicher im Tuxertal, Tirol.
In: Grundwasser, S. 137-145, 21, (2), ISSN 1430-483X,
[Online-Edition: http://dx.doi.org/10.1007/s00767-016-0327-y],
[Artikel]

2015

Sass, I. ; Brehm, D. ; Coldewey, W. G. ; Dietrich, J. ; Klein, R. ; Kellner, T. ; Kirschbaum, B. ; Lehr, C. ; Marek, A. ; Mielke, P. ; Müller, L. ; Panteleit, B. ; Pohl, S. ; Porada, J. ; Schiessl, S. ; Wedewardt, M. ; Wesche, D.
Deutsche Gesellschaft für Geotechnik e.V., Deutsche Gesellschaft für Geowissenschaften e.V. (Urheber) (2015):
Empfehlung Oberflächennahe Geothermie - Planung, Bau, Betrieb und Überwachung - EA Geothermie.
Berlin, Ernst & Sohn, ISBN 978-3-433-02967-1,
[Buch]

Sass, I. ; Heldmann, C.-D. ; Lehr, C. ; Schäffer, R. (2015):
Hydrogeological Exploration of an Alpine Marble Karst for Geothermal Utilization.
In: World Geothermal Congress 2015, Melbourne, 19.-24.04.2015, [Konferenzveröffentlichung]

2014

Sass, I. ; Lehr, C. ; Heldmann, C.-D. ; Schäffer, R. (2014):
Site Development of Marble Karst Reservoir for Borehole Exchanger Storage, Finkenberg, Zillertal, Austria.
In: European Geosciences Union Geophysical Research Abstracts, Copernicus Publications, In: European Geosciences Union General Assembly, Wien, 27.04.-02.05.2014, 16, [Konferenzveröffentlichung]

Lehr, C. ; Sass, I. (2014):
Thermo-optical parameter acquisition and characterisation of geologic properties - A 400 meter deep BHE in a karstic alpine marble aquifer.
In: Environmental Earth Sciences, S. 1403-1419, 72, (5), [Online-Edition: http://link.springer.com/article/10.1007%2Fs12665-014-3310-x],
[Artikel]

2013

Sass, I. ; Lehr, C. (2013):
Design Parameter Acquisition of an Underground Heat Storage and Extraction System â\text\euro\grqq a Deep BHE Array in a Karstic Alpine Marble Aquifer for 1 GWh Power.
In: Proceedings Stanford Geothermal Workshop, In: Stanford Geothermal Workshop, Stanford, 11.-13.02.2013, [Konferenzveröffentlichung]

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