Design optimization and long-term control of borehole heat exchanger fields in heterogeneous ground under descriptive and predictive uncertainty
Final Report Abstract
Uncontrolled heat extraction or input through the operation of neighboring borehole heat exchangers (BHEs) within a BHE field can lead to undesirable thermal conditions in the ground. Such induced thermal anomalies develop over long periods of time and pose a technical risk. These conditions can severely impair the system performance of the BHE field or even result in the operation not meeting legal requirements. In this project, a flexible approach for the combined mathematical simulation and optimization of BHE fields over their entire service life is developed. The aim is to find optimal system solutions for BHE operation even if the relevant conditions in the description of the subsurface and the prognosis of the operation are uncertain. The proposed method takes into account uncertainties related to ground properties and energy consumption. It aims to minimize the temperature changes in the subsurface caused by heat extraction or injection during operation. Within the framework of semi-analytical simulation using the line source approach, layered heterogeneity of the subsurface, groundwater flow and non-uniform in situ heat flow are modeled. The model is cast into an optimization and control process that continuously learns during operation and optimally adapts the heat exchange in the BHE field by individually controlling each BHE. The model is integrated into an optimization and control framework that continuously learns during operation and optimally adapts the heat exchange in the BHE field by individually controlling each BHE. This works via iterative updating and Bayesian learning, and it is successfully demonstrated using the example of hypothetical but fully known case studies with hidden features.
Publications
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Sequential simulation-optimization of a borehole heat exchanger field considering variability in heating demand and subsurface thermal responses. Copernicus GmbH.
Soltan, Mohammadi Hesam; Ringel, Lisa Maria & Bayer, Peter
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Adaptive management of borehole heat exchanger fields under transient groundwater flow conditions. Renewable Energy, 234, 121060.
Soltan, Mohammadi Hesam; Ringel, Lisa Maria; Bott, Christoph & Bayer, Peter
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Adaptive optimization of borehole heat exchanger fields in response to transient groundwater flow. 51st IAH Congress, Davos, Switzerland.
Soltan Mohammadi, H., Ringel, L. M., Bott, C. & Bayer, P.
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High-resolution monitoring and simulation of the temperatures in a borehole heat exchanger field over multiple years. 2024 Research Conference Proceedings of the IGSHPA. International Ground Source Heat Pump Association.
Gebhardt, Hannah; Mohammadi, Hesam Soltan; Ebert, Andreas; Bott, Christoph; Visser, Adriaan & Bayer, Peter
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Sequential long-term optimization of shallow geothermal systems under descriptive uncertainty and dynamic variation of heating demand. Geothermics, 121, 103021.
Soltan, Mohammadi Hesam; Ringel, Lisa Maria; de Paly, Michael & Bayer, Peter
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Bayesian uncertainty quantification in temperature simulation of borehole heat exchanger fields for geothermal energy supply. Applied Thermal Engineering, 265, 125210.
Soltan, Mohammadi Hesam; Ringel, Lisa Maria; Bott, Christoph; Erol, Selçuk & Bayer, Peter
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Tuning the performance of a borehole heat exchanger array in response to transient hydrogeological conditions. Copernicus GmbH.
Soltan, Mohammadi Hesam; Ringel, Lisa Maria; Bott, Christoph & Bayer, Peter
