Subtopic: Sources of power on the farm – human, animal, mechanical, electrical, wind, solar and biomass
Question Statement:
A flat plate solar collector at Bhopal (23°15′N, 77°42′E), tilted 30° from horizontal, facing due South. For hour angle 45° (3:00 PM LAT) on June 30, 2023, find the angle of incidence of beam radiation on the collector (degrees). (Rounded to 2 decimal places)
Official Answer Key:
53.00 to 53.50
Step-by-Step Solution & Explanation
Solar declination for day 181 (June 30): δ ≈ 23.18°. Using the general incidence-angle equation cosθ = sinδ sinφ cosβ − sinδ cosφ sinβ cosγ + cosδ cosφ cosβ cosω + cosδ sinφ sinβ cosγ cosω + cosδ sinβ sinγ sinω (φ = 23.25° latitude, β = 30° tilt, γ = 0° due south, ω = 45°), cosθ ≈ 0.5985 ⇒ θ ≈ 53.19°.
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