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A Modelica Toolbox for the Simulation of Borehole Thermal Energy Storage Systems

Formhals, Julian ; Hemmatabady, Hoofar ; Welsch, Bastian ; Schulte, Daniel Otto ; Sass, Ingo (2020)
A Modelica Toolbox for the Simulation of Borehole Thermal Energy Storage Systems.
In: Energies, 2020, 13 (9)
doi: 10.25534/tuprints-00013419
Artikel, Zweitveröffentlichung

Kurzbeschreibung (Abstract)

Borehole thermal energy storage (BTES) systems facilitate the subsurface seasonal storage of thermal energy on district heating scales. These systems’ performances are strongly dependent on operational conditions like temperature levels or hydraulic circuitry. Preliminary numerical system simulations improve comprehension of the storage performance and its interdependencies with other system components, but require both accurate and computationally efficient models. This study presents a toolbox for the simulation of borehole thermal energy storage systems in Modelica. The storage model is divided into a borehole heat exchanger (BHE), a local, and a global sub-model. For each sub-model, different modeling approaches can be deployed. To assess the overall performance of the model, two studies are carried out: One compares the model results to those of 3D finite element method (FEM) models to investigate the model’s validity over a large range of parameters. In a second study, the accuracies of the implemented model variants are assessed by comparing their results to monitoring data from an existing BTES system. Both studies prove the validity of the modeling approaches under investigation. Although the differences in accuracy for the compared variants are small, the proper model choice can significantly reduce the computational effort.

Typ des Eintrags: Artikel
Erschienen: 2020
Autor(en): Formhals, Julian ; Hemmatabady, Hoofar ; Welsch, Bastian ; Schulte, Daniel Otto ; Sass, Ingo
Art des Eintrags: Zweitveröffentlichung
Titel: A Modelica Toolbox for the Simulation of Borehole Thermal Energy Storage Systems
Sprache: Englisch
Publikationsjahr: 2020
Publikationsdatum der Erstveröffentlichung: 2020
Verlag: MDPI
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Energies
Jahrgang/Volume einer Zeitschrift: 13
(Heft-)Nummer: 9
DOI: 10.25534/tuprints-00013419
URL / URN: https://doi.org/10.3390/en13092327
Herkunft: Zweitveröffentlichung aus gefördertem Golden Open Access
Kurzbeschreibung (Abstract):

Borehole thermal energy storage (BTES) systems facilitate the subsurface seasonal storage of thermal energy on district heating scales. These systems’ performances are strongly dependent on operational conditions like temperature levels or hydraulic circuitry. Preliminary numerical system simulations improve comprehension of the storage performance and its interdependencies with other system components, but require both accurate and computationally efficient models. This study presents a toolbox for the simulation of borehole thermal energy storage systems in Modelica. The storage model is divided into a borehole heat exchanger (BHE), a local, and a global sub-model. For each sub-model, different modeling approaches can be deployed. To assess the overall performance of the model, two studies are carried out: One compares the model results to those of 3D finite element method (FEM) models to investigate the model’s validity over a large range of parameters. In a second study, the accuracies of the implemented model variants are assessed by comparing their results to monitoring data from an existing BTES system. Both studies prove the validity of the modeling approaches under investigation. Although the differences in accuracy for the compared variants are small, the proper model choice can significantly reduce the computational effort.

URN: urn:nbn:de:tuda-tuprints-134198
Sachgruppe der Dewey Dezimalklassifikatin (DDC): 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften
Fachbereich(e)/-gebiet(e): 11 Fachbereich Material- und Geowissenschaften
11 Fachbereich Material- und Geowissenschaften > Geowissenschaften
11 Fachbereich Material- und Geowissenschaften > Geowissenschaften > Fachgebiet Angewandte Geothermie
Hinterlegungsdatum: 28 Aug 2020 11:38
Letzte Änderung: 07 Sep 2020 06:59
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