An optimal control algorithm for borehole thermal energy storage systems |
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Authors: | Fjo De Ridder Moritz DiehlGrietus Mulder Johan DesmedtJohan Van Bael |
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Affiliation: | a Flemish Institute for Technological Research - Energy Technology, Boeretang 200, B-2400 Mol, Belgium b K.U. Leuven, Electrical Engineering Department (ESAT-SCD), Optimization in Engineering Center, Kasteelpark Arenberg 10, 3001 Leuven-Heverlee, Belgium |
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Abstract: | The aim of this paper is to present an optimal control algorithm to manage borehole thermal energy storage systems (BTES). Such a system gets exhausted, if it is employed intensively, i.e. outlet fluid is outside acceptable temperature ranges, and can no longer provide the desired heat or cold. To avoid this problem a control algorithm is proposed, which simultaneously optimizes the operation costs. This algorithm is based on a dynamic programming technique and results in an array which provides the optimal heat flux for a given field temperature, date and demand. The controller is illustrated on a simulation of an existing building. Several weather scenarios have been examined and the system remained robust under all situations. |
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Keywords: | Underground heat storage Borehole thermal energy storage system Optimal control HVAC |
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