A radial model for fast analysis of thermal pile heat exchangers

Energy piles offer an effective way to decarbonise heating and cooling via exchange of heat through the deep foundations of a building or other structure. However, efficient analysis methods are required to allow energy performance to be determined in a way compatible with building energy design and energy system design approaches. We test a fast run time analytical model (the Claesson-Javed radial model) that retains a physical basis linked to the energy pile geometry, while making simplifications to permit a radial approximation to be used. We also present validation G-functions from the model development processes that have been derived from 2D and 3D numerical simulation.