Thermal design method for multiple precast energy piles

Maria Alberdi Pagola, Søren Erbs Poulsen, Rasmus Lund Jensen, Søren Madsen

Research output: Contribution to journalJournal articleResearchpeer-review

8 Citations (Scopus)


This paper investigates the applicability of numerical and semi-empirical heat flow models for calculating average fluid temperatures in groups of quadratic, precast pile heat exchangers. A 3D finite element model (FEM), verified with experimental data, is extended to account for multiple pile heat exchangers. Semi-empirical dimensionless temperature g-functions for multiple piles are developed by utilising single pile 3D FEM heat transport simulations with temporal and spatial superposition techniques to account for the thermal interaction between piles. The multiple pile g-functions, yet less accurate for short times, yield fluid temperatures similar to those obtained with full 3D modelling (with 7% of largest deviation), at minimal computational cost.

Original languageEnglish
Article numberGEOT_2018_117_R1
Issue numberMarch 2019
Pages (from-to)201-210
Number of pages10
Publication statusPublished - Mar 2019


  • Pile heat exchangers
  • Energy pile
  • G-functions
  • Multiple piles
  • Interaction
  • 3D finite element model
  • Semiempirical model
  • Pile heat exchanger
  • Semi-empirical model
  • g-functions


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