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Optimization of Medium-Deep Borehole Thermal Energy Storage Systems

Schulte, D. O. and Rühaak, W. and Oladyshkin, S. and Welsch, B. and Sass, I. (2016):
Optimization of Medium-Deep Borehole Thermal Energy Storage Systems.
In: Energy Technology, WILEY-VCH Verlag, pp. 104-113, 4, ISSN 2194-4296,
[Article]

Abstract

Arrays of medium-deep borehole heat exchangers are characterized by their slow thermal response and large storage capacity. They represent suitable thermal energy storage systems for seasonally fluctuating heat sources such as solar energy or district heating grids. However, the economic feasibility of these systems is compromised by high investment costs, especially by the expensive drilling of the boreholes. This study presents an approach for the simulation and optimization of borehole thermal energy storage systems. To exemplify the concept, a software tool is used to optimize the number and length of borehole heat exchangers with regard to a specific annual heat demand. The tool successfully determines the ideal size of the thermal energy storage. Furthermore, the prediction of the system’s performance also indicates that borehole thermal energy storage systems only operate efficiently in large-scale applications. With the presented tool, many aspects of borehole thermal energy storage systems can be simulated and optimized.

Item Type: Article
Erschienen: 2016
Creators: Schulte, D. O. and Rühaak, W. and Oladyshkin, S. and Welsch, B. and Sass, I.
Title: Optimization of Medium-Deep Borehole Thermal Energy Storage Systems
Language: English
Abstract:

Arrays of medium-deep borehole heat exchangers are characterized by their slow thermal response and large storage capacity. They represent suitable thermal energy storage systems for seasonally fluctuating heat sources such as solar energy or district heating grids. However, the economic feasibility of these systems is compromised by high investment costs, especially by the expensive drilling of the boreholes. This study presents an approach for the simulation and optimization of borehole thermal energy storage systems. To exemplify the concept, a software tool is used to optimize the number and length of borehole heat exchangers with regard to a specific annual heat demand. The tool successfully determines the ideal size of the thermal energy storage. Furthermore, the prediction of the system’s performance also indicates that borehole thermal energy storage systems only operate efficiently in large-scale applications. With the presented tool, many aspects of borehole thermal energy storage systems can be simulated and optimized.

Journal or Publication Title: Energy Technology
Volume: 4
Publisher: WILEY-VCH Verlag
Divisions: 11 Department of Materials and Earth Sciences > Earth Science > Geothermal Science and Technology
11 Department of Materials and Earth Sciences > Earth Science
11 Department of Materials and Earth Sciences
Date Deposited: 27 Jan 2016 12:47
Identification Number: doi:10.1002/ente.201500254
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