Next Article in Journal
Experimental Study on the Flow Field of Particles Deposited on a Gasoline Particulate Filter
Next Article in Special Issue
Design of Groundwater Heat Pump Systems. Principles, Tools, and Strategies for Controlling Gas and Precipitation Problems
Previous Article in Journal
Evaluation of a Scale-Resolving Methodology for the Multidimensional Simulation of GDI Sprays
Previous Article in Special Issue
Measured Performance of a Mixed-Use Commercial-Building Ground Source Heat Pump System in Sweden
Open AccessArticle

Thermal Response Testing of Large Diameter Energy Piles

1
Department of Infrastructure Engineering, University of Melbourne, Parkville, VIC 3010, Australia
2
School of Civil Engineering, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, UK
*
Author to whom correspondence should be addressed.
Energies 2019, 12(14), 2700; https://doi.org/10.3390/en12142700
Received: 7 June 2019 / Revised: 5 July 2019 / Accepted: 11 July 2019 / Published: 15 July 2019
(This article belongs to the Special Issue Modelling and Monitoring of Geothermal Heating and Cooling Systems)
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. View Full-Text
Keywords: shallow geothermal; ground source heat pump; energy piles; foundations; thermal response test; numerical analysis shallow geothermal; ground source heat pump; energy piles; foundations; thermal response test; numerical analysis
Show Figures

Figure 1

MDPI and ACS Style

Jensen-Page, L.; Loveridge, F.; Narsilio, G.A. Thermal Response Testing of Large Diameter Energy Piles. Energies 2019, 12, 2700.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop