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Solar Angles Describe the sun position relative to a vertical surface.

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Presentation on theme: "Solar Angles Describe the sun position relative to a vertical surface."— Presentation transcript:

1 Solar Angles Describe the sun position relative to a vertical surface

2 Solar Altitude: β (beta) Vertical angle to sun position

3 Solar Azimuth: Φ (phi) Horizontal bearing angle from south

4 Surface Azimuth: Ψ (psi) Surface horizontal bearing angle from south

5 Surface Solar Azimuth: γ (gamma) Angle between solar and surface azimuths γ = Φ - Ψ

6 Sign Conventions Angles east of south are negative Angles west of south are positive + - S -90º90º 0º -45º 45º

7 Calculating Surface Solar Azimuth γ = Φ – Ψ For example: Building façade is oriented south east (Ψ =-45º) Solar azimuth (ϕ) is 30º west of south γ = 30º – (-45º) = 75º Note: |γ|≥ 90º, façade in shade -45º 30º


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