Parametric study for the long term energetic performance of geothermal energy piles
Loading...
Access rights
openAccess
publishedVersion
URL
Journal Title
Journal ISSN
Volume Title
A4 Artikkeli konferenssijulkaisussa
This publication is imported from Aalto University research portal.
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)
Authors
Date
Department
Major/Subject
Mcode
Degree programme
Language
en
Pages
Series
1st Nordic conference on Zero Emission and Plus Energy Buildings, 6-7 November 2019, Trondheim, Norway, IOP Conference Series: Earth and Environmental Science ; Volume 352, 1
Abstract
Geothermal energy constitutes an important renewable resource that will become increasingly prominent in future constructions. A common method of extraction and usage consists of installing, inside the foundation piles of buildings, U-shaped heat exchangers called "energy piles". In this paper such installations are addressed by means of a full parametric study, performed for a hall-type commercial building in a cold climate. By computing the transient heat transfer between energy piles and ground for a period of 20 years, guidelines for a preliminary sizing of the geothermal system as a whole are provided. These are valid for this specific building and climate, for a clay-type soil and without assuming thermal storage. A highly nonlinear behaviour of the expected yield in relation to pile separation and evaporator extraction power is observed. Furthermore, 15m-long piles are found to be more efficient than those with double length, a smaller extraction power seems to be more favourable and differences in the pile diameter have little impact for heat transfer. A geothermal system sizing guide, which is useful for a preliminary quantitative test prior to any installation, is introduced. Even though our specific results are valid only for a commercial hall-type building in Finland, our procedure is qualitatively general and can be utilized for any given building type and climate zone.Description
Keywords
Other note
Citation
Ferrantelli, A, Fadejev, J & Kurnitski, J 2019, Parametric study for the long term energetic performance of geothermal energy piles. in 1st Nordic conference on Zero Emission and Plus Energy Buildings, 6-7 November 2019, Trondheim, Norway. IOP Conference Series: Earth and Environmental Science, no. 1, vol. 352, Institute of Physics Publishing, Nordic Conference on Zero Emission and Plus Energy Buildings, Trondheim, Norway, 06/11/2019. https://doi.org/10.1088/1755-1315/352/1/012011