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Optimized Layouts of Borehole Thermal Energy Storage Systems in 4th Generation Grids

Hemmatabady, Hoofar ; Formhals, Julian ; Welsch, Bastian ; Schulte, Daniel Otto ; Sass, Ingo (2021)
Optimized Layouts of Borehole Thermal Energy Storage Systems in 4th Generation Grids.
In: Energies, 2020, 13 (17)
doi: 10.26083/tuprints-00019241
Article, Secondary publication, Publisher's Version

Copyright Information: CC BY 4.0 International - Creative Commons, Attribution.

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Item Type: Article
Type of entry: Secondary publication
Title: Optimized Layouts of Borehole Thermal Energy Storage Systems in 4th Generation Grids
Language: English
Date: 2021
Year of primary publication: 2020
Journal or Publication Title: Energies
Volume of the journal: 13
Issue Number: 17
Collation: 26 Seiten
DOI: 10.26083/tuprints-00019241
Corresponding Links:
Origin: Secondary publication via sponsored Golden Open Access

Borehole thermal energy storage (BTES) systems are a viable option to meet the increasing cooling demand and to increase the sustainability of low-temperature district heating and cooling (DHC) grids. They are able to store the rejected heat of cooling cycles on a seasonal basis and deliver this heat during the heating season. However, their efficient practical implementation requires a thorough analysis from technical, economic and environmental points of view. In this comparative study, a dynamic exergoeconomic assessment is adopted to evaluate various options for integrating such a storage system into 4th generation DHC grids in heating dominated regions. For this purpose, different layouts are modeled and parameterized. Multi-objective optimization is conducted, varying the most important design variables in order to maximize exergetic efficiency and to minimize levelized cost of energy (LCOE). A comparison of the optimal designs of the different layouts reveals that passive cooling together with maximizing the heating temperature shift, accomplished by a heat pump, lead to optimal designs. Component-wise exergy and cost analysis of the most efficient designs highlights that heat pumps are responsible for the highest share in inefficiency while the installation of BTES has a high impact in the LCOE. BTES and buffer storage tanks have the lowest exergy destruction for all layouts and increasing the BTES volume results in more efficient DHC grids.

Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-192410
Classification DDC: 500 Science and mathematics > 550 Earth sciences and geology
Divisions: 11 Department of Materials and Earth Sciences > Earth Science > Geothermal Science and Technology
Date Deposited: 03 Aug 2021 07:13
Last Modified: 03 Aug 2021 07:13
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/19241
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