G-Functions for multiple interacting pile heat exchangers
G-Functions for multiple interacting pile heat exchangers
Pile heat exchangers – where heat transfer pipes are cast into the building piled foundations – offer an opportunity to use ground energy systems without the additional construction costs related to the provision of special purpose heat exchangers. However, analysis methods for pile heat exchangers are still under development. In particular there is an absence of available methods and guidance for the amount of thermal interaction that may occur between adjacent pile heat exchangers and the corresponding reduction in available energy that this will cause. This is of particular importance as the locations of foundation piles are controlled by the structural demands of the building and cannot be optimised with respect to the thermal analysis. This paper presents a method for deriving G-functions for use with multiple pile heat exchangers. Example functions illustrate the primary importance of pile spacing in controlling available energy, followed by the number of piles within any given arrangement. Significantly it was found that the internal thermal behaviour of a pile is not influenced appreciably by adjacent piles.
ground heat exchanger, pile, ground energy system, ground source heat pump system
747-757
Loveridge, F.A.
fb5b7ad9-d1b8-40d3-894b-bccedf0e8a77
Powrie, W.
600c3f02-00f8-4486-ae4b-b4fc8ec77c3c
1 January 2014
Loveridge, F.A.
fb5b7ad9-d1b8-40d3-894b-bccedf0e8a77
Powrie, W.
600c3f02-00f8-4486-ae4b-b4fc8ec77c3c
Abstract
Pile heat exchangers – where heat transfer pipes are cast into the building piled foundations – offer an opportunity to use ground energy systems without the additional construction costs related to the provision of special purpose heat exchangers. However, analysis methods for pile heat exchangers are still under development. In particular there is an absence of available methods and guidance for the amount of thermal interaction that may occur between adjacent pile heat exchangers and the corresponding reduction in available energy that this will cause. This is of particular importance as the locations of foundation piles are controlled by the structural demands of the building and cannot be optimised with respect to the thermal analysis. This paper presents a method for deriving G-functions for use with multiple pile heat exchangers. Example functions illustrate the primary importance of pile spacing in controlling available energy, followed by the number of piles within any given arrangement. Significantly it was found that the internal thermal behaviour of a pile is not influenced appreciably by adjacent piles.
Text
multiple Gfunct rev2 clean.pdf
- Accepted Manuscript
More information
Accepted/In Press date: 6 November 2013
e-pub ahead of print date: 8 December 2013
Published date: 1 January 2014
Keywords:
ground heat exchanger, pile, ground energy system, ground source heat pump system
Organisations:
Infrastructure Group
Identifiers
Local EPrints ID: 359691
URI: http://eprints.soton.ac.uk/id/eprint/359691
ISSN: 0360-5442
PURE UUID: 339ffdc1-bbd3-4343-8cf3-c0a6c4872abc
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Date deposited: 29 Nov 2013 13:35
Last modified: 15 Mar 2024 02:48
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