Cecinato, F, Piglialepre, R, Loveridge, F orcid.org/0000-0002-6688-6305 et al. (1 more author) (2016) Numerical analysis of thermal cycling during a multi-stage energy pile thermal response test. In: Wuttke, F, Bauer, S and Sanchez, M, (eds.) Energy Geotechnics. 1st International Conference on Enegry Geotechnics (ICEGT 2016), 29-31 Aug 2016, Keil, Germany. CRC Press , pp. 593-599. ISBN 978-1-138-03299-6
Abstract
Energy piles are emerging as convenient alternative to the more traditional borehole heat exchangers (BHEs) to provide heating/cooling to buildings, as they remove the need for special purpose excavations and can accommodate more pipes, thus enhancing energy performance. However, their different aspect ratio compared to BHEs requires different modelling tools and dedicated thermal response testing, to achieve adequate thermal design. In this work, the results of an extended multi-stage thermal response test (TRT) carried out on a single energy pile installed in London Clay are presented in terms of both fluid temperature data and concrete temperature, measured by vibrating wire strain gauges and optic fibre sensors. The results are then explored in detail by means of a finite element numerical code, able to account for both convective heat exchange in the fluid, between the fluid and the solids and transient heat diffusion in the concrete and the ground. Analysis of the TRT field data shows that during the later stages of the test there is clear evidence of cyclic changes in performance. Investigation of these effects using the numerical model raises the possibility that there could be some alteration of the properties of the soil-pile contact during the test. Hypotheses for the observed behaviour are tentatively put forward and discussed with work recommended to further investigate the percieved phenomena.
Metadata
Item Type: | Proceedings Paper |
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Copyright, Publisher and Additional Information: | © 2016 Taylor & Francis Group, London. This is an Accepted Manuscript of a book chapter published by CRC Press in Energy Geotechnics on 8 August 2016, available online: http://www.routledge.com/9781138032996. Uploaded in accordance with the publisher's self-archiving policy. |
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) |
Funding Information: | Funder Grant number Royal Academy of Engineering Not Known |
Depositing User: | Symplectic Publications |
Date Deposited: | 02 Nov 2016 12:18 |
Last Modified: | 10 Aug 2017 03:58 |
Published Version: | https://doi.org/10.1201/b21938-93 |
Status: | Published |
Publisher: | CRC Press |
Identification Number: | 10.1201/b21938-93 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:106821 |