Cum se calculează Solar Irradiance
Ce este Solar Irradiance?
Solar irradiance is solar power density reaching Earth's surface. It varies by location, time, clouds, and atmospheric conditions.
Ghid pas cu pas
- 1Direct normal irradiance (DNI): beam radiation perpendicular to surface
- 2Diffuse horizontal irradiance (DHI): scattered radiation from entire sky
- 3Global horizontal irradiance (GHI): total arriving at horizontal surface
Exemple rezolvate
Intrare
Clear day, sea level, solar noon
Rezultat
GHI ≈ 1000 W/m² (AM 1.5 standard spectrum)
Peak theoretical
Greșeli frecvente de evitat
- ✕Using peak 1000 W/m² without accounting for clouds and seasons
- ✕Neglecting angle-of-incidence effects
Întrebări frecvente
How does altitude affect irradiance?
Higher elevation reduces atmospheric path, increasing irradiance. 1000 m altitude ~10% higher than sea level.
Why do solar panels need tilting?
Tilting captures more direct irradiance. Optimal angle ≈ latitude for fixed systems.
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