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Improvements for building-performance simulations by a comparative finite-element method analysis

  • This paper presents a method to improve building-performance simulations (BPS) by the comparison and analysis of different approaches based on finite-element method (FEM) models. The lumped parameter method (LPM) is used in several BPS programs and tools. It has the advantage of fast computing times and comparably good accuracy for thermal and energy loads. With the help of detailed FEM simulations, it is possible to further improve the degree of detail and accuracy while maintaining the high simulation speed. In this work, we compare time-dependent results for local temperatures in a generic reference room within a given periode of time. In a second step, the differences between the models with respect to various physical effects are analyzed and used to introduce additional equations into the LPM model in order to improve its accuracy. Thus, we discuss potentials for improvement for BPS and demonstrate a method of a practical implementation. The results show minor differences of less than 0.1 K for radiation and heat transfer, so their level of detail in BPS is appropriate. In these terms, no improvements were pursued within the work. However, the FEM simulation is capable of calculating the internal convective heat transfer and thermal bridges more accurately due to the use of computational fluid dynamics (CFD) and the geometrically precise representation of the FEM model. Here, deviations of up to 1 K in room temperature (convective heat transfer) and up to 0.5 K in wall temperatures (thermal bridges) were pointed out. By improving the LPM with equations obtained from the FEM, these deviations can be reduced to less than 0.2 K, which is a considerable improvement in accuracy.

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Metadaten
Author:Paul Dragos Schloplocher, Stefan Ettengruber, Oliver SteffensORCiDGND
DOI:https://doi.org/10.1016/j.enbuild.2022.112563
Parent Title (English):Energy and Buildings
Publisher:Elsevier
Document Type:Article
Language:English
Year of first Publication:2023
Release Date:2022/11/04
Tag:Building performance simulation; Finite-element method; Lumped parameter model
Volume:278
Article Number:112563
First Page:1
Last Page:12
Note:
Corresponding author: Dragos Paul Schoplocher
Institutes:Fakultät Angewandte Natur- und Kulturwissenschaften
Fakultät Angewandte Natur- und Kulturwissenschaften / Labor Bauphysik
Begutachtungsstatus:peer-reviewed
Kostenträger (Forschungsprojekt, Labor, Einrichtung etc.):EddA (ZIM)
research focus:Gebäude und Infrastruktur
OpenAccess Publikationsweg:Hybrid Open Access - OA-Veröffentlichung in einer Subskriptionszeitschrift/-medium
Corresponding author der OTH Regensburg
Licence (German):Creative Commons - CC BY - Namensnennung 4.0 International