Seasonal Thermal Energy Storage — Borehole Field Simulator (2D)

Energy and time are inseparable: heat demand peaks in winter, solar supply peaks in summer, and the gap between the two is exactly what seasonal storage is built to close. This simulator models a borehole thermal energy store as six concentric rock shells exchanging heat by conduction, charged by a simulated summer solar collector and discharged by a simulated winter heating load, with losses bleeding to the ambient ground the whole year round. A top-down radial cross-section (drag to rotate, scroll to zoom) shows every shell's live temperature, while a strip-chart panel tracks a rolling year of core temperature, stored energy and losses. Run the clock forward and tune the charge and draw rates and the store's insulation quality to see the round-trip efficiency respond.