Cecinato, F and Loveridge, FA orcid.org/0000-0002-6688-6305
(2015)
Influences on the thermal efficiency of energy piles.
Energy, 82.
pp. 1021-1033.
ISSN 0360-5442
Abstract
Energy piles have recently emerged as a viable alternative to borehole heat exchangers, but their energy efficiency has so far seen little research. In this work, a finite element numerical model is developed for the accurate 3D analysis of transient diffusive and convective heat exchange phenomena taking place in geothermal structures. The model is validated by reproducing both the outcome of a thermal response test carried out on a test pile, and the average response of the linear heat source analytical solution. Then, the model is employed to carry out a parametric analysis to identify the key factors in maximising the pile energy efficiency. It is shown that the most influential design parameter is the number of pipes, which can be more conveniently increased, within a reasonable range, compared to increasing the pile dimensions. The influence of changing pile length, concrete conductivity, pile diameter and concrete cover are also discussed in light of their energetic implications. Counter to engineering intuition, the fluid flowrate does not emerge as important in energy efficiency, provided it is sufficient to ensure turbulent flow. The model presented in this paper can be easily adapted to the detailed study of other types of geothermal structures.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2015, Elsevier Ltd. This is an author produced version of a paper published in Energy. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Energy piles; Geothermal; Thermal efficiency; Thermal response test; Numerical modelling; Convection–diffusion |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Civil Engineering (Leeds) > Institute for Resilient Infrastructure (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 21 Sep 2016 14:38 |
Last Modified: | 17 Jan 2018 03:44 |
Published Version: | http://dx.doi.org/10.1016/j.energy.2015.02.001 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.energy.2015.02.001 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:103493 |