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• Lectures for the courses
  • Energy self-sufficient buildings
  • Heat pumps and refrigeration systems
• Internship for the course
  • Energy systems
• Head of the process engineering material and process data working group
• Head of the Scientific Diving Centre at the TU Bergakademie Freiberg
• Managing and applying for third-party funded projects (DFG, SAB, EFRE)

• Utilisation of mine water
  • Investigation of the contamination of heat exchangers on real systems and on a mobile test stand
  • Monitoring of systems in Saxony
• Evaporation and condensation processes
  • Film distribution and falling film evaporation on structured surfaces
  • Wetting of surfaces: Film thickness measurement, contact angle measurement
• Heat transport with thermosiphons
  • Nanofluids to improve heat transport
  • Geothermal phase change probes
  • Scientific immersion
  • Reverse thermosiphons
• Energetic plant monitoring
  • Geothermal plants (phase change probes and water/glycol probes)
• Development of measurement technology for use in scientific dives
  • Temperature measurement
  • Gas and liquid volume flow measurement

T. Wunderlich, L. Oppelt, T. Ebel, F. Raithel, W. Krause, T. Grab, T. Fieback:
Status quo, potentials and challenges in the energetic use of mine water
Mining Report Glückauf, No. 161, February 2025 (Article)

T. Wunderlich, L. Oppelt, T. Ebel, F. Raithel, T. Grab, T. Fieback:
Energetic use of highly mineralised deep waters as an aspect of material co-production of minerals
DOI 10.5281/zenodo.14844202. Geothermal Congress 2024, 23.10.2024, Potsdam

P. Heinrich, T. Wenzel, M. Bleidießel, R. Manig, L. Oppelt, T. Ebel, T. Wunderlich, T. Grab:

in B. Kleinmann, J. Skousen, C. Wolkersdorfer: Proceedings of the International Mine Water Association Conference & West Virginia Mine Drainage Task Force Symposium, International Mine Water Association, ISBN: 978-3-9825293-2-5, 2024

T. Wenzel, P. Heinrich, R. Manig, T. Ebel, T. Wunderlich, L. Oppelt, T. Grab:

in B. Kleinmann, J. Skousen, C. Wolkersdorfer: Proceedings of the International Mine Water Association Conference & West Virginia Mine Drainage Task Force Symposium, International Mine Water Association, ISBN: 978-3-9825293-2-5, 2024

T. Grab, T. Wunderlich, T. Ebel, L. Oppelt, T. Fieback, T. Wenzel, P. Heinrich, R. Manig:
Site-specific feasibility study for the regenerative energy supply of buildings using mine water geothermal energy in the Saxon municipalities of Oelsnitz i.E., which are characterised by the consequences of hard coal mining, Lugau, Gersdorf and Hohndorf (PDF)
Freiberger Forschungsheft A 947 Energie, Freiberg, 2024, ISBN: 978-86012-707-0

K. Korniejenko, S. Gadek, P. Dynowski, D. H. Tran, M. Rudziewicz, S. Pose, T. Grab:

Applied Sciences 2024, 14, 1346

V. Růžek, A. M. Dostayeva, J. Walter, T. Grab, K. Korniejenko:
Carbon Fibre-Reinforced Geopolymer Composites: A Review
MDPI Journal fibers, DOI:

L. Oppelt, T. Grab, T. Wunderlich, T. Storch, T. Fieback:

CLIMA 2022-Proceedings, Rotterdam, 2022, DOI: 10.34641/clima.2022.55

T. Wunderlich; L. Oppelt; T. Grab; T. Wenzel; P. Heinrich; R. Manig; T. Fieback:

Geothermal Energy, No. 102, Vol. 31, pp. 26-29, 2022

A. Fichtner, B. Brunner, E. Kloemich, T. Grab, T. Pohl, T. Fieback:
Sonographic Estimation Rather Than Quantification of Fluid Status Using Inferior Vena Cava and Other Major Vessel Parameters in a Non-Bleeding Fluid Loss and Centralisation Model.
Open Access Emerg Med. 2021 Aug 20; 13:391-398. doi: 10.2147/OAEM.S321860. eCollection 2021;

L. Oppelt, S. Pose, T. Grab, T. Fieback:
Disused mines as a regenerative energy source - Vyřazené doly jako regenerativní zdroj energie
Published in: Rommel, A.; Hädecke, S.; Ussath, M.; Hübschmann, M.: , pages 112-135, Dresden, 2021

Oppelt, L.; Pose, S.; Grab, T.; Fieback, T.:
Grubenwassergeothermie als innovative Energiequelle - Bergbaufolgegebiete positiv nutzen -
Published in: , Seite 38-50, Dresden, 2021

J. Abeywickrama, M. Grimmer, N. Hoth, T. Grab, C. Drebenstedt:
Geochemical characterisation of fouling on mine water driven plate heat exchangers in Saxon mining region, Germany.
International Journal of Heat and Mass Transfer 176 (2021)

L. Oppelt, T. Grab, S. Pose, T. Storch, T. Fieback:
Mine water geothermal energy as a regenerative energy source - status quo and results from five years of monitoring
Oil Gas EUROPEAN MAGAZINE, 47th Edition, 1/2021, S 15-19, March 2021

L. Oppelt, S. Pose, T. Grab, T. Fieback:
Regenerative energy production from mine water
Acamonta, Vol. 27, pp. 47-51, December 2020

Oppelt, Lukas; Pose, Sebastian; Grab, Thomas, Fieback, Tobias:
Mine water geothermal energy as an innovative energy source - status quo and results from five years of monitoring
The Digital Geothermal Congress 2020, 09.-13.11.2020

Oppelt, Lukas; Kaplin, Kristina, Grimmer, Marlies, Grab, Thomas, Hoth, Nils; Fieback, Tobias:
Mine water geothermal energy as a renewable energy source - status quo, risks and potential
Final workshop VODAMIN II, 15.10.2020, Freiberg

Oppelt, Lukas; Pose, Sebastian; Grab, Thomas, Fieback, Tobias:
Mine water as a renewable energy source function-examples-potentials
4th workshop of the GeoMAP project, 27.01.2020, Freiberg

Oppelt, Lukas; Pose, Sebastian, Kaplin, Kristina; Grab, Thomas; Fieback, Tobias (eds.):
Geothermal potential of mine water and challenges of plant engineering - Geotermický potenciál důlních vod a technologické výzvy,
Conference proceedings of the 2nd conference of the GeoMAP project. Fachkonferenz des Projekts GeoMAP, 26 November 2019, Freiberg

Thomas Grab, Lisa-Marie Wilde, Lukas Oppelt, Sebastian Pose, Bastian Wenzke, Tobias Fieback (eds.):
Possibilities and Challenges in the Utilisation of Mine Waters - Možnosti a výzvy při využívání důlních vod
Freiberger Forschungshefte A 935 Energie, ISBN: 978-3-86012-628-8

Oppelt, L., Pose, S., Grab, T., Fieback, T.:

Geothermische Energie, No. 95, Vol. 29, pp. 24-27, May 2020

Wenzke, B., Grab, T., Ussath, M., Fieback, T.:
Energetic utilisation of mine water and the influence of water quality on plant operation
The Geothermal Congress 2018, 27 - 29 November 2018, Essen, Germany

Grab, T., Wenzke, B., Ussath, M., Storch, T., Fieback, T.:
Worldwide utilisation of mine water and its different effects on plant operation
The Geothermal Congress 2018, 27 - 29 November 2018, Essen, Germany

Grab, T., Storch, T., Groß, U.:
Energetic utilisation of mine water from flooded mines
Published in: Bauer, M., Freeden, W., Jacobi, H., Neu, T. (eds.): Handbuch Oberflächennahe Geothermie, Chapter 17, Springer Spektrum, 2018, ISBN: 978-3-662-50306-5,

Storch, T., Grab, T., Groß, U.:
Geothermal phase change probes as a heat extraction system
Published in: Bauer, M., Freeden, W., Jacobi, H., Neu, T. (eds.): Handbuch Oberflächennahe Geothermie, Chapter 13, Springer Spektrum, 2018, ISBN: 978-3-662-50306-5,

Eichinger, S., Storch, T., Grab, T., Fieback, T., Gross, U.:
Investigations of the spreading of falling liquid films in inclined tubes
International Journal of Heat and Mass Transfer, Volume 119, April 2018, pp. 568 - 600,

Grab, T.:
Improvement of film spreading on falling film evaporator surfaces using the example of geothermal phase change probes
Dissertation, TU Bergakademie Freiberg, Shaker Verlag, 2015, ISBN: OND-00000-0000175,

Eichinger, S., Grab, T., Storch, T., Gotterbarm, A., Groß, U.:
Flow and wetting behaviour of falling liquid films inside inclined and internal structurally-finned tubes
First Thermal and Fluids Engineering Summer Conference 2015, 09 - 12 August 2015, New York City, USA, pp. 1309 - 1321, ISBN: 978-1-56700-430-4,

Grab, T., Storch, T., Eichinger, S., Groß, U.:
Wetting behaviour of propane drops on solid materials
First Thermal and Fluids Engineering Summer Conference 2015, 09 - 12 August 2015, New York City, USA, pp. 2049 - 2056, ISBN: 978-1-56700-430-4,

Hartmann, F., Behrend, R, Hantsch, A., Grab, T., Groß, U.:
Numerical investigation of the performance of a partially-wetted geothermal heat pipe at various power demand schemes
Geothermics, Volume 55, May 2015, pp. 99 - 107,

Grab, T., Groß, U., Franzke, U., Buschmann, M.:
Operation performance of thermosyphons employing titania and gold nanofluids
International Journal of Thermal Sciences, Volume 86, December 2014, pp. 352 - 364,

Grab, T., Buschmann, M.:
The thermal performance of thermosyphons employing nanofluids
WIT Transactions on Engineering Sciences, Heat Transfer XIII, Volume 83, 2014, pp. 315 - 324, ISBN: 978-1-84564-794-0,

Grab, T., Storch, T., Groß, U., Wagner, S.:
Performance of geothermal thermosyphons using propane,
Heat Pipe Science and Technology, An International Journal, Volume 2, Issue 1 - 4, 2011, pp. 43 - 53, ISSN: 2151-7975,

Grab, T., Arnberg, L.:
Influence of TiB₂ particles on growth of eutectic silicon in aluminium-silicon alloys
International Journal Of Cast Metals Research, Volume 19, Issue 4, 2006, pp. 201 - 209,

T. Wunderlich; L. Oppelt; T. Ebel, F. Raithel; T. Grab; T. Fieback:
Energetic use of highly mineralised deep waters as an aspect of material co-production of minerals (lecture)
Geothermal Congress 2024, 22-24 October 2024, Potsdam

T. Ebel, W. Krause, T. Wunderlich; L. Oppelt, F. Raithel; T. Grab; T. Fieback:
Comparison of optimised models for the investigation of heating potentials in abandoned mines using mine water (poster)
Geothermal Congress 2024, 22-24.10.2024, Potsdam

L. Oppelt, T. Wunderlich, F. Raithel, T. Ebel, W. Krause, T. Grab; T. Fieback:
Development of a predictive tool for the prediction of fouling and derivation of an effective heat exchanger design for the energetic utilisation of mine water(oral presentation)
Geothermal Congress 2024, 22-24 October 2024, Potsdam

L. Oppelt, T. Wenzel, M. Bleidiesel, P. Heinrich, M. Binder, A. Arab, R. Wiedener, C. Chen, F. Schenker, T. Lotter, T. Nagel, T. Grab, T. Fieback, T. Scheytt:
Seasonal heat storage in partially flooded mine workings - in-situ investigations at the Freiberg site (lecture)
Geothermal Congress 2024, 22-24 October 2024, Potsdam

P. Heinrich, T. Wenzel, R. Manig, L. Oppelt, T. Ebel, T. Wunderlich, T. Grab, T. Fieback:
Climate-neutral heating and cooling supply of buildings with mine water geothermal energy in the mining region Erzgebirge
56th Power Plant Technology Colloquium, 08-09 October 2024, Dresden (Poster)

P. Heinrich, T. Wenzel, T. Wunderlich, T. Grab, T. Fieback:
Klimaneutrale Wärme- und Kälteversorgung von Gebäuden mit Grubenwassergeothermie in der Montanregion Erzgebirge
. Heinrich, T. Wenzel, M. Bleidießel, R. Manig, L. Oppelt, T. Ebel, T. Wunderlich, T. Grab:
Analysis of a base-load-capable heat supply of quarters considering aquifers in disused mines as heat storages for locally specific renewable (waste) heat potentials
15th International Mine Water Association Congress, 21-26 April 2024, Morgantown, USA (Poster)

T. Wenzel, P. Heinrich, R. Manig, T. Ebel, T. Wunderlich, L. Oppelt, T. Grab:
GIS-based development of anergy networks using mine water geothermal energy for cross-sectoral heating and cooling supply of municipal quarters
15th International Mine Water Association Congress, 21-26 April 2024, Morgantown, USA (oral presentation)

T. Wunderlich, L. Oppelt, T. Grab, T. Fieback:
Quartier solutions using heat from mine water
kassel22, 06-08 September 2022, Kassel

L. Oppelt, T. Wunderlich, T. Grab, S. Pose, T. Fieback:
Effective energetic use of mine water through optimised heat exchanger design
kassel22, 06-08.09.2022, Kassel

L. Oppelt, T. Grab, T. Wunderlich, T. Fieback:
Mine water as a regenerative energy source - increasing efficiency through optimised heat exchanger design
ZeWaF lunch bag seminar, 17.06.2022, Freiberg

T. Wunderlich, L. Oppelt, T. Grab, T. Fieback:
Quarter solutions for energy transition using heat from mine water.
73rd BHT: 9th PhD-Conference; 2022, June 10; Freiberg, Germany

L. Oppelt, T. Grab, T. Wunderlich, T. Storch, T. Fieback:

CLIMA 2022, Rotterdam, 22.05. - 25.05.2022

L. Oppelt, T. Grab, T. Wunderlich, T. Fieback:

Workshop series "Niedertemperaturwärmequellen - Potentiale und effiziente Nutzung", 03.05.2021, Online

L. Oppelt; T. Grab; S. Pose; T. Grab:
Green energy from abandoned mines - status quo and project results of VODAMIN II and GeoMAP
Abandoned coal mines - promising sites to store heat in the underground, 28 September 2021, Online

L. Oppelt; T. Grab; S. Pose; T. Grab:

Geothermie-Insights, 17 September 2021, Berlin/online

T. Fieback; L. Oppelt; T. Grab; T. Storch; L.-M. Heisig:
Tests to reduce fouling in the heat exchanger during the energetic utilisation of mine water
Thermodynamics Colloquium 2021, 27-29 September 2021, Online

L. Oppelt; T. Grab; F. Hahn; T. Fieback:
Green energy from post-mining landscapes
72nd BHT-FREIBERGER UNIVERSITÄTSFORUM "Technologies for climate protection", 09-11 June 2021, Online

L. Oppelt, T. Grab, S. Pose, T. Fieback:
Energetic utilisation of mine water
Workshop "Geothermal energy and heat pump", 04 May-18 May 2021, Online

L. Oppelt, S. Pose, T. Grab, T. Fieback:
Mine water geothermal energy as an innovative energy source - making positive use of post-mining areas
Final conference GeoMAP, 23 April 2021, Freiberg / Online

L. Oppelt; T. Grab; T. Storch; T. Fieback:

Jahrestreffen der ProcessNet-Fachgruppen Fluidverfahrenstechnik und Wärme-und Stoffübertragung, 24-26.02.2021, Online

L. Oppelt; S. Pose; T. Grab; T. Fieback:
Disused mines as a regenerative heat source in the Ore Mountains and Northern Bohemia
3rd conference of the GeoMAP project, 22 January 2021, Ostrava (Czech Republic) / Online

T. Grab, B. Wenzke, T. Fieback:
Geothermal use of mine waters
Deponieworkshop Zittau-Liberec, 09-10 November 2017, Zittau, Germany

T. Grab:
Pumpless heat transport using a reverse thermosiphon.
Berg- und Hüttenmännischer Tag, 9-10 June 2016, Freiberg, Germany

S. Eichinger, Th. Grab, Th. Storch, T. Fieback, U. Gross:
Wetting behaviour of falling films in inclined, structured pipes.
Submitted: ProcessNet annual meeting of the multiphase flows and heat and mass transfer groups, 01-02 March , Kassel, Germany

S. Eichinger, Th. Grab, Th. Storch, T. Fieback, U. Gross:
Wetting behaviour of propane on solids.
Submitted: ProcessNet Annual Meeting of the Multiphase Flows and Heat and Mass Transfer Groups, 01-02 March , Kassel, Germany

Th. Grab, Th. Storch, S. Eichinger, U. Gross:
Wetting behaviour of propane drops on solid materials.
1^st Thermal and Fluids Engineering Summer Conf. - TFESC, 9-12 Aug. 2015, New York City, USA

S. Eichinger, Th. Grab, Th. Storch, A. Gotterbarm, U. Gross:
Flowing and wetting behaviour of falling liquid films in inclined and internal structured tubes.
1^st Thermal and Fluids Engineering Summer Conf. - TFESC, 9-12 Aug. 2015, New York City, USA

Th. Storch, Th. Grab, R. M. Wagner, U. Gross:
Visual and energetic investigations on a real geothermal phase change probe with propane.
14th International User Forum on Near-Surface Geothermal Energy - 16-17 June 2015, Neumarkt i. d. Oberpfalz, Germany

S. Eichinger, Th. Grab, Th. Storch, U. Gross:
Wetting behaviour of falling films in inclined, structured pipes.
ProcessNet - Annual meeting of the multiphase flow and heat and mass transfer groups, 24-25 March , Fulda, Germany

Th. Storch, Th. Grab, R. M. Wagner, U. Gross:
Visual investigations of the evaporation processes in a geothermal phase change probe.
ProcessNet - Annual meeting of the multiphase flow and heat and mass transfer groups, 24-25 March 2014, Fulda, Germany

Th. Grab, Th. Storch, T. Weickert, U. Gross, S. Wagner:
Heat extraction using geothermal phase change probes.
Sächsischer Geothermietag Spezial, 06 June 2012, Freiberg, Germany

Th. Storch, T. Weickert, Th. Grab, U. Gross, M. Kasper:
Wetting and film behaviour of Propane inside geothermal heat pipes.
16^th Int. Heat Pipe Conf. (IHPC), 20-24 May 2012, Lyon, France

T. Weickert, Th. Grab, Th. Storch, U. Gross:
Wetting-Research with Propane Drops on Solid Materials.
16^th Int. Heat Pipe Conf. (IHPC), 20 - 23 May, 2012, Lyon, France

Th. Storch, Th. Grab, U. Gross, S. Wagner:
Investigations of geothermal heat pipes.
3^rd European Geothermal PhD Day (EGPD), 27 - 30 March, 2012, Pisa, Italy

Th. Grab, Th. Storch, T. Weickert, U. Gross:
Investigations regarding the wetting behaviour of propane on the surfaces of geothermal heat pipes.
3^rd European Geothermal PhD Day (EGPD), 27. - 30. March, 2012, Pisa, Italy

Th. Grab, Th. Storch, S. Braune, U. Gross, S. Wagner:
Performance of a geothermal heat pipe using propane.
VIII Minsk International Seminar - Heat Pipes, Heat Pumps, Refrigerators, Power Sources, 12 - 15 September, 2011, Minsk, Belarus

Th. Storch, Th. Grab, C. Zieger, M. Kupka, U. Gross, R. M. Wagner:
Visual observations inside a geothermal heat pipe.
VIII Minsk International Seminar - Heat Pipes, Heat Pumps, Refrigerators, Power Sources, 12 - 15 September, 2011, Minsk, Belarus

T. Weickert, Th. Grab, Th. Storch, U. Gross:
Investigations regarding the wetting behaviour of propane on the surfaces of geothermal heat pipes.
VIII Minsk International Seminar - Heat Pipes, Heat Pumps, Refrigerators, Power Sources-, 12 - 15 September, 2011, Minsk, Belarus

Th. Grab, Th. Storch, U. Gross, S. Grötzsch, J. Kleutges:
Geothermal plant for mine water utilisation for heating (200 - max. 670 kW) and cooling (155 - max. 500 kW).
The Geothermal Congress 2010, 17 - 19 November, 2010, Karlsruhe, Germany

Th. Storch, Th. Grab, St. Wagner, U. Gross:
Evaluation of a geothermal plant with direct evaporation probes.
The Geothermal Congress 2010, 17 - 19 November, 2010, Karlsruhe, Germany

Th. Grab, Th. Storch, S. Wagner, U. Gross:
Interactions between heating and cooling circuits in a geothermal direct evaporation probe field.
German Refrigeration and Air Conditioning Conference, DKV, 17 - 19 November, 2010, Magdeburg, Germany

Th. Grab, Th. Storch, S. Wagner, U. Gross:
Use of geothermal energy for heating and cooling of buildings by means of direct evaporation and brine probes - using the example of the "Reichen Zeche" Freiberg.
Saxon Geothermal Day, October 28-29, 2010, Torgau, Germany