analysis_periodselectdefault: annualannual | summer | winter | summer_solstice | winter_solsticeTime period for cumulative radiation accumulation.
Annual gives total irradiance for PV yield estimates. Summer shows peak overheating risk on west and south facades. Winter solstice isolates passive solar gain potential.
surface_typeselectdefault: rooftoprooftop | south_facade | east_facade | west_facade | north_facade | all_facadesWhich building surface to compute radiation for.
Rooftop is highest for PV. South facade (N hemisphere) has the most consistent winter gain. West facade shows the highest afternoon overheating risk in summer.
sky_modelselectdefault: perezisotropic | perezRadiation model used to distribute diffuse skylight.
Perez is more accurate for tilted and vertical surfaces. Isotropic is faster and sufficient for rooftop PV screening.
overheating_threshold_kwhnumberdefault: 400100–800 (step 50)Summer cumulative irradiance above which a surface is flagged as overheating risk.
CIBSE TM52 uses ~120 kWh/m² (summer) as a rough facade overheating indicator. Lower values flag more surfaces; higher values flag only the most exposed.
Start with Annual + Rooftop to rank buildings by PV yield potential. Switch to Summer + All Facades to identify facades at risk of overheating — combine with the Outdoor Thermal Comfort model to assess combined heat stress. For shading studies: run on baseline, then run again with proposed shading devices added in a scenario.