Group thermal response testing for energy piles
Group thermal response testing for energy piles
Thermal response testing is an in situ technique for characterising the thermal conductivity of the ground around a borehole heat exchanger. The test has seen renewed interest in recent years as an increasing number of ground heat exchangers are being constructed to provide renewable heating and cooling energy as part of ground source heat pump systems. The thermal response test involves applying a constant heating power to the ground via a circulating heat transfer fluid. Most test rigs are set up to cater for deep boreholes, with available heat transfer lengths typically more than 100m, and therefore have electrical heater capacities of a corresponding size. Pile heat exchangers are generally much shorter and the heat exchange length can be a little as 10m. This means that many standard thermal response test rigs cannot provide a low enough heating power and there is a risk of excessive temperature changes developing, especially during longer duration tests which can be recommended for larger diameter piles. One solution is to carry out the thermal response test on a group of piles, thereby increasing the effective heated length. This has the added advantage of testing a larger volume of soil. This paper examines the principles behind group thermal response testing for energy piles and considers the advantages and limitations of the approach with reference to a case study
Loveridge, F.A.
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Olgun, C.G.
e1ad2ef2-7e65-4c04-8b89-d57826ebcf51
Brettmann, T.
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Powrie, W.
600c3f02-00f8-4486-ae4b-b4fc8ec77c3c
2015
Loveridge, F.A.
fb5b7ad9-d1b8-40d3-894b-bccedf0e8a77
Olgun, C.G.
e1ad2ef2-7e65-4c04-8b89-d57826ebcf51
Brettmann, T.
6b6b4465-13af-44e1-a237-6f305390995b
Powrie, W.
600c3f02-00f8-4486-ae4b-b4fc8ec77c3c
Loveridge, F.A., Olgun, C.G., Brettmann, T. and Powrie, W.
(2015)
Group thermal response testing for energy piles.
Winter, MG, Smith, DM and Eldred, PJL
(eds.)
In Geotechnical Engineering for Infrastructure and Development: XVI European Conference on Soil Mechanics and Geotechnical Engineering.
Thomas Telford.
6 pp
.
Record type:
Conference or Workshop Item
(Paper)
Abstract
Thermal response testing is an in situ technique for characterising the thermal conductivity of the ground around a borehole heat exchanger. The test has seen renewed interest in recent years as an increasing number of ground heat exchangers are being constructed to provide renewable heating and cooling energy as part of ground source heat pump systems. The thermal response test involves applying a constant heating power to the ground via a circulating heat transfer fluid. Most test rigs are set up to cater for deep boreholes, with available heat transfer lengths typically more than 100m, and therefore have electrical heater capacities of a corresponding size. Pile heat exchangers are generally much shorter and the heat exchange length can be a little as 10m. This means that many standard thermal response test rigs cannot provide a low enough heating power and there is a risk of excessive temperature changes developing, especially during longer duration tests which can be recommended for larger diameter piles. One solution is to carry out the thermal response test on a group of piles, thereby increasing the effective heated length. This has the added advantage of testing a larger volume of soil. This paper examines the principles behind group thermal response testing for energy piles and considers the advantages and limitations of the approach with reference to a case study
Text
XVIECSMGE2015_0183_final_revised.pdf
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More information
Accepted/In Press date: January 2015
e-pub ahead of print date: 23 November 2015
Published date: 2015
Venue - Dates:
XVI European Conference for Soil Mechanics and Geotechnical Engineering, , Edinburgh, United Kingdom, 2015-09-13 - 2015-09-17
Organisations:
Infrastructure Group
Identifiers
Local EPrints ID: 373865
URI: http://eprints.soton.ac.uk/id/eprint/373865
PURE UUID: 7fc0897f-c374-4bfc-89f6-351369679908
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Date deposited: 30 Jan 2015 15:33
Last modified: 16 Mar 2024 02:47
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Contributors
Author:
C.G. Olgun
Author:
T. Brettmann
Editor:
MG Winter
Editor:
DM Smith
Editor:
PJL Eldred
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