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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. (Publisher's Version)
In: Energies, 13 (17), ISSN 1996-1073,
DOI: 10.26083/tuprints-00019241,

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

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Item Type: Article
Origin: Secondary publication via sponsored Golden Open Access
Status: Publisher's Version
Title: Optimized Layouts of Borehole Thermal Energy Storage Systems in 4th Generation Grids
Language: English

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.

Journal or Publication Title: Energies
Volume of the journal: 13
Issue Number: 17
Collation: 26 Seiten
Classification DDC: 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften
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
DOI: 10.26083/tuprints-00019241
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-192410
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/19241
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