Abstract Summary
Energy screw piles combines the agile construction of screw piles with renewable shallow geothermal energy. Moreover, the screw piles can be filled with Phase change materials (PCM) to provide latent thermal storage. This work explores a novel underground heat exchange system that combines traditional energy screw piles with thermal storage screw piles filled with PCM (TSP). Simulations are undertaken with numerical modelling, providing insights on the operation of short energy piles groups and how PCM improves the thermal storage. The PCM improves the system performance for cooling while deteriorates it for heating, and the TSP stores up to 190 MJ/m3.
