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Temperature response functions (G-functions) for single pile heat exchangers

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  • Loveridge, Fleur
  • Powrie, William

Abstract

Foundation piles used as heat exchangers as part of a ground energy system have the potential to reduce energy use and carbon dioxide emissions from new buildings. However, current design approaches for pile heat exchangers are based on methods developed for boreholes which have a different geometry, with a much larger aspect (length to diameter) ratio. Current methods also neglect the transient behaviour of the pile concrete, instead assuming a steady state resistance for design purposes. As piles have a much larger volume of concrete than boreholes, this neglects the significant potential for heat storage within the pile. To overcome these shortcomings this paper presents new pile temperature response functions (G-functions) which are designed to reflect typical geometries of pile heat exchangers and include the transient response of the pile concrete. Owing to the larger number of pile sizes and pipe configurations which are possible with pile heat exchangers it is not feasible to developed a single unified G-function and instead upper and lower bound solutions are provided for different aspects ratios.

Suggested Citation

  • Loveridge, Fleur & Powrie, William, 2013. "Temperature response functions (G-functions) for single pile heat exchangers," Energy, Elsevier, vol. 57(C), pages 554-564.
    • Handle: RePEc:eee:energy:v:57:y:2013:i:c:p:554-564
    DOI: 10.1016/j.energy.2013.04.060
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    References listed on IDEAS

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    4. C.J. Wood & H. Liu & S.B. Riffat, 2010. "Comparison of a modelled and field tested piled ground heat exchanger system for a residential building and the simulated effect of assisted ground heat recharge-super-†," International Journal of Low-Carbon Technologies, Oxford University Press, vol. 5(3), pages 137-143, March.
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