Conference paper: Towards high thermal-to-hydraulic performance of heat exchangers for water-gravel thermal energy storage

Authors: Abdulrahman Dahash (AIT), Fabrizia Giordano (AIT), Ahmed Serageldin (AIT), Emre Bas (PGM), Rainer Strobel (PGM)

The paper “Toward High Thermal‑Hydraulic Performance of Heat Exchangers for Water‑Gravel Thermal Energy Storage” is directly relevant to INTERSTORES, as it addresses the optimisation of large-scale water‑gravel seasonal thermal energy storage (sTES) systems. Using COMSOL Multiphysics, the authors developed a coupled thermo‑hydraulic model to evaluate and optimise heat exchanger layout, flow conditions, and thermal‑to‑hydraulic performance at the INTERSTORES in‑campus demo site. The study demonstrates how multi-level configurations, orientation, and flow management improve both thermal efficiency and reduce pumping work. The methodology provides a replicable framework for designing, simulating, and optimising sTES, supporting INTERSTORES’ objectives in performance enhancement, cost-effective deployment, risk mitigation, and replication across sites. Overall, it bridges simulation with practical design, reinforcing INTERSTORES’ demonstration and dissemination goals

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Conference paper: Towards high thermal-to-hydraulic performance of heat exchangers for water-gravel thermal energy storage

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