Title Holistic Simulation of Heat Extraction Sheet Pile Walls for Renewable Energy Extraction

This study numerically investigates Heat Extraction Sheet Pile Walls (HESPWs) for low-temperature geothermal energy using a 3D transient heat-transfer model in COMSOL Multiphysics. We analyze how flow rates, boundary conditions, and thermal interactions between sheet piles, soil, canals, and the atmosphere affect performance in an urban canal context. Simulations show higher flow rates lower outlet temperatures but boost total heat extraction, while the Thermal to Pumping Power Ratio (TPR) drops due to increased pumping needs. Lower flow rates improve TPR but limit energy output. These trade-offs emphasize tailoring flow rates to goalsmaximizing power for district heating or efficiency for smaller systems. HESPWs prove viable for urban infrastructure, combining structural support with sustainable heating and cooling.