Loveridge, F orcid.org/0000-0002-6688-6305, Powrie, W and Nicholson, D (2014) Comparison of two different models for pile thermal response test interpretation. Acta Geotechnica, 9 (3). pp. 367-384. ISSN 1861-1125
Abstract
Thermal response tests (TRTs) are regularly used to characterise the thermal resistance of borehole heat exchangers and to assess the thermal conductivity of the surrounding ground. It is becoming common to apply the same in situ testing technique to pile heat exchangers, despite international guidance suggesting that TRTs should be limited to hole diameters of 152 mm (6 in.). This size restriction arises from the increased thermal inertia of larger diameter heat exchangers, which invalidates the assumption of a steady state within the concrete needed to interpret the test data by traditional line source analysis techniques. However, new methods of analysis for pile heat exchangers have recently been developed that take account of the transient behaviour of the pile concrete. This paper applies these new methods to data from a multi-stage TRT conducted on a small diameter test pile. The thermal conductivity and thermal resistance determined using this method are then compared with those from traditional analytical approaches based on a line source analysis. Differences between the approaches are discussed, along with the observation that the thermal resistance may not be constant over the different test stages.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2014 Springer-Verlag Berlin Heidelberg. This is an author produced version of a paper published in Acta Geotechnica. The final publication is available at Springer via http://dx.doi.org/10.1007/s11440-014-0306-3. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Ground source heat pumps; Piled foundations; Thermal response tests; Thermal affects; Thermo-active foundations |
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: | 29 Sep 2016 11:50 |
Last Modified: | 21 Jan 2018 03:00 |
Published Version: | http://dx.doi.org/10.1007/s11440-014-0306-3 |
Status: | Published |
Publisher: | Springer Verlag |
Identification Number: | 10.1007/s11440-014-0306-3 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:104830 |