This cluster examines the energy and process aspects of geothermal energy production. The research covers both the conceptual design of components as well as their development and in situ testing. The goal is to increase the efficiency of geothermal power plants by optimizing the heat exchanger and by coordinating individual components with each other. For this purpose, MoNiKa , a modular low-temperature power plant cycle, was developed as a generic research infrastructure.
Another research goal of this cluster is the quality assurance in the power plant operation from the drilling phase. For this purpose, methods are developed for the measurement of crucial parameters directly in the deep borehole. The basis is the modular platform ZWERG for the systematic and reliable development of probes for geothermal purposes. A subproject is dedicated to the development of a borehole camera, GeoKam, which will enable a video stream from the borehole. Furthermore, a probe will be developed to sample fluids from the well at different depths and times. The WaSam device should make it possible to bring fluid samples to the surface for further analysis without pressure and temperature losses.
Temperature entropy diagram (Schröder et al.) of a simulated supercritical process with a schematic illustration of the temperature curves of geothermal fluids (red) and cooling air (yellow).
Components of the GeoKam inspection probe and systematic development of the ZWERG toolbox (Isele et al.).
Holbein, Benedict; Isele, Jörg; Spatafora, Luigi (2015): Integrated cooling systems for an extended operation range of borehole tools. In: Transactions - Geothermal Resources Council, Bd. 39, S. 1073–1078.
Isele, J.; Bauer, C.; Dietze, S.; Holbein, B.; Spatafora, L. (2015): The ZWERG project: a platform for innovative logging tools. In: IGA (Hg.): World Geothermal Congress. Melbourne, Australia, 19-25 April 2015: Int. Geothermal Association.
Nusiaputra, Y. Y., Qadri, F., Kuhn, D., Abdurrachim, H. (2015): Empirical Correlation for Optimal Turbine Inlet Temperature and Pressure for Geothermal Sub- and Supercritical Organic Rankine Cycles (ORC). In: IGA (Hg.): World Geothermal Congress. Melbourne, Australia, 19-25 April 2015: Int. Geothermal Association.
Schröder, Elisabeth; Thomauske, Klaus; Schmalzbauer, Jens; Herberger, Sabrina; Gebert, Christoph; Velevska, Marina (2015): Design and test of a new flow calorimeter for online detection of geothermal water heat capacity. In: Geothermics 53, S. 202–212. DOI: 10.1016/j.geothermics.2014.06.001
Spatafora, L.; Armbruster, P.; Basuki, W. W.; Bauer, C.; Dietze, S.; Hauser, P. (2015): Video inspection probe for deep geothermal boreholes. In: IGA (Hg.): World Geothermal Congress. Melbourne, Australia, 19-25 April 2015: Int. Geothermal Association.
Holbein, B.; Isele, J. (2014): Development of a cooling system for geothermal borehole probes. In: Journal of Earth Science and Engineering (4).
Holbein, Benedict; Isele, Jörg; Spatafora, Luigi (2014): Test-stand for geothermal borehole probes. In: Transactions - Geothermal Resources Council, Bd. 38, S. 549–554.
Nusiaputra, Yodha; Wiemer, Hans-Joachim; Kuhn, Dietmar (2014): Thermal-Economic Modularization of Small, Organic Rankine Cycle Power Plants for Mid-Enthalpy Geothermal Fields. In: Energies 7 (7), S. 4221–4240. DOI: 10.3390/en7074221
Schröder, Elisabeth; Neumaier, Klaus; Nagel, Fabian; Vetter, Christian (2014): Study on heat transfer in heat exchangers for a new supercritical organic rankine cycle. In: Heat Transfer Engineering 35 (18), S. 1505–1519. DOI: 10.1080/01457632.2014.897558