Loveridge, F orcid.org/0000-0002-6688-6305, Olgun, CG, Brettmann, T et al. (1 more author) (2015) The Thermal Behaviour of Three Different Auger Pressure Grouted Piles Used as Heat Exchangers. Geotechnical and Geological Engineering, 33 (2). pp. 273-289. ISSN 0960-3182
Abstract
Three auger pressure grouted (APG) test piles were constructed at a site in Richmond, Texas. The piles were each equipped with two U-loops of heat transfer pipes so that they could function as pile heat exchangers. The piles were of two different diameters and used two different grouts, a standard APG grout and a thermally enhanced grout. Thermal response tests, where fluid heated at a constant rate is circulated through the pipe loops, were carried out on the three piles, utilising either single or double loops. The resulting test data can be used to determine the surrounding soil thermal conductivity and the pile thermal resistance, both essential design parameters for ground source heat pump systems using pile heat exchangers. This paper uses parameter estimation techniques to fit empirical temperature response curves to the thermal response test data and compares the results with standard line source interpretation techniques. As expected, the thermal response tests with double loops result in smaller thermal resistances than the same pile when the test was run with a single loop. Back analysis of the pile thermal resistance also allows calculation of the grout thermal properties. The thermally enhanced grout is shown to have inferior thermal properties than the standard APG grout. Together these analyses demonstrate the importance of pile size, grout thermal properties and pipe positions in controlling the thermal behaviour of heat exchanger piles.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2014, Springer International Publishing Switzerland. This is an author produced version of a paper published in Geotechnical and Geological Engineering. Uploaded in accordance with the publisher's self-archiving policy. The final publication is available at Springer via http://dx.doi.org/10.1007/s10706-014-9757-4. |
Keywords: | Ground source heat pumps; Piling; Pile heat exchangers; Thermal properties; Thermal response test |
Dates: |
|
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: | 12 Aug 2016 10:00 |
Last Modified: | 17 Jan 2018 23:40 |
Published Version: | http://dx.doi.org/10.1007/s10706-014-9757-4 |
Status: | Published |
Publisher: | Springer Verlag |
Identification Number: | 10.1007/s10706-014-9757-4 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:103492 |