Hybrid-BHE-Simulation-Model

This repository contains a hybrid simulation approach for 1U-, 2U- and coaxial single, and field of, borehole heat exchangers. We implement a novel combination of existing solutions for the simulation of heat transfer processes within the borehole and the surrounding ground. The heat transfer in the ground is modelled with a combination of analytically determined g-functions, the borehole models utilize thermal resistance capacity models and the finite volume method. Critically, we improve the computational efficiency of long-term simulations by sub-dividing the time scale into multiple periods, where the influence of past periods on future periods is calculated using the Fast Fourier Transform.