Thermal Response Testing of Large Diameter Energy Piles

Author:

Jensen-Page Linden,Loveridge FleurORCID,Narsilio Guillermo A.ORCID

Abstract

Energy piles are a novel form of ground heat exchanger (GHE) used in ground source heat pump systems. However, characterizing the pile and ground thermal properties is more challenging than for traditional GHEs. Routine in-situ thermal response testing (TRT) methods assume that steady state conditions in the GHE are achieved within a few hours, whereas larger diameter energy piles may take days or even weeks, thereby incurring significant costs. Previous work on pile TRTs has focused on small diameters up to 450 mm. This paper makes the first rigorous assessment of TRT methods for larger diameter piles using field and laboratory datasets, the application of numerical and analytical modelling, and detailed consideration of costs and program. Three-dimensional numerical simulation is shown to be effective for assessing the data gathered but is too computationally expensive for routine practice. Simpler fast run time steady state analytical models are shown to be a theoretically viable tool where sufficient duration test data is available. However, a new assessment of signal to noise ratio (SNR) in real field data shows how power fluctuations cause increased uncertainty in long duration tests. It is therefore recommended to apply transient models or instead to carry out faster and more cost-effective borehole in-situ tests for ground characterization with analytical approaches for pile characterization.

Funder

Australian Research Council

Royal Academy of Engineering

Len Stevens Scholarship

Department of Environment, Land, Water and Planning, State Government of Victoria

Publisher

MDPI AG

Subject

Energy (miscellaneous),Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment,Electrical and Electronic Engineering,Control and Optimization,Engineering (miscellaneous)

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1. The impact of soil layering and groundwater flow on energy pile thermal performance;Geomechanics for Energy and the Environment;2024-06

2. Thermal Response of Energy Screw Piles Connected in Series;Journal of Geotechnical and Geoenvironmental Engineering;2023-07

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