Central Madrid · latitude 40.4°N · real sun position, physically-based sky & lighting. Drag to orbit · adjust the overhang and glazing to see the trade-offs.
A physically accurate sun for the selected location, lit by a physically-based sky. The round roof casts a real shadow onto the deck and the central glass core. Choose a location, drag Day, Time and Overhang, switch the glazing, or press Play – the heat table below recomputes live.
Solar time, true-south assumed. Core is the as-built ECHO glazed pod (≈4.5 m). A study model – not a substitute for full energy simulation.
Clear-sky solar energy entering the glazed core through the east / south / west glass, after the roof overhang's shading. Recomputes live with the overhang and glazing controls. A radiant solar-gain estimate only – conduction and ventilation are separate.
| Month | Peak (kW) | Daily (kWh) | Monthly (kWh) | Direct % |
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Assumptions: ≈34 m² glazing (E/S/W; north face solid), selectable SHGC, ASHRAE clear-sky model at 40.7°N, isotropic diffuse with overhang sky-blocking, ground albedo 0.20, overhang shades direct beam above the angle set by its depth. Clear-sky upper bound – real gains are lower on cloudy days. Indicative, not a full energy simulation.
The solar gain above translated into cooling energy, running cost and CO₂ – and the free winter heat the overhang gives up. Recomputes with the overhang and glazing.