Thermal performance of thermoactive continuous flight auger piles
Thermal performance of thermoactive continuous flight auger piles
Foundation piles are being increasingly equipped with heat exchangers to efficiently harvest shallow geothermal energy. For buildings in urban areas, continuous flight auger (CFA) piles are common owing to their speed, cost-efficiency and low noise levels. To construct a thermoactive CFA pile usually requires separate central installation of the heat exchanger. However, the energy performance of this type of pile has not been investigated systematically, with most studies focused on rotary piles where the heat exchanger is attached to the reinforcing cage. In this work, insights are provided about the main influences on the energy efficiency of thermoactive CFA piles, with a focus on the implications of using CFA construction techniques rather than rotary boring. An innovative three-dimensional numerical model, able to capture the different aspects of transient heat transfer, is employed together with analytical methods to evaluate the transient and steady-state behaviour of energy piles in a number of design situations. Attention is given to understanding the role of possible pipe-to-pipe interaction, which cannot be systematically investigated with standard methods. Finally, practical guidelines on the optimal choice of design parameters to maximise the energy efficiency of CFA piles, without altering the geotechnical arrangements, are provided.
energy geotechnics, piles, piling, thermal effects
265-279
Loveridge, F.A.
fb5b7ad9-d1b8-40d3-894b-bccedf0e8a77
Cecinato, F
84c6646d-e9dc-4410-b4f6-64d25270b297
August 2016
Loveridge, F.A.
fb5b7ad9-d1b8-40d3-894b-bccedf0e8a77
Cecinato, F
84c6646d-e9dc-4410-b4f6-64d25270b297
Loveridge, F.A. and Cecinato, F
(2016)
Thermal performance of thermoactive continuous flight auger piles.
Environmental Geotechnics, 3 (4), .
(doi:10.1680/jenge.15.00023).
Abstract
Foundation piles are being increasingly equipped with heat exchangers to efficiently harvest shallow geothermal energy. For buildings in urban areas, continuous flight auger (CFA) piles are common owing to their speed, cost-efficiency and low noise levels. To construct a thermoactive CFA pile usually requires separate central installation of the heat exchanger. However, the energy performance of this type of pile has not been investigated systematically, with most studies focused on rotary piles where the heat exchanger is attached to the reinforcing cage. In this work, insights are provided about the main influences on the energy efficiency of thermoactive CFA piles, with a focus on the implications of using CFA construction techniques rather than rotary boring. An innovative three-dimensional numerical model, able to capture the different aspects of transient heat transfer, is employed together with analytical methods to evaluate the transient and steady-state behaviour of energy piles in a number of design situations. Attention is given to understanding the role of possible pipe-to-pipe interaction, which cannot be systematically investigated with standard methods. Finally, practical guidelines on the optimal choice of design parameters to maximise the energy efficiency of CFA piles, without altering the geotechnical arrangements, are provided.
Text
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More information
Accepted/In Press date: 3 February 2016
e-pub ahead of print date: 28 July 2016
Published date: August 2016
Keywords:
energy geotechnics, piles, piling, thermal effects
Organisations:
Infrastructure Group
Identifiers
Local EPrints ID: 386197
URI: http://eprints.soton.ac.uk/id/eprint/386197
PURE UUID: f55fd528-2a0d-4ac7-895e-b973c6242afb
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Date deposited: 29 Jan 2016 09:53
Last modified: 14 Mar 2024 22:28
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Author:
F Cecinato
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