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Radiation intensity ‘I’ normal to the surface is given by __________(a) ICosθ(b) Itanθ(c) ICotθ(d) IsinθI had been asked this question in final exam.I want to ask this question from Solar Constant in division Solar Energy of Energy Engineering

Answer»

The correct answer is (a) ICosθ

To elaborate: I = ICosθ, Let θ = Angle between an INCIDENT beam radiation I and the normal to the PLANE surface. And the θ is REFERRED to as incident angle. And further by this formula latitude angle, declination, hour angle, zenith angle and solar AZIMUTH ANGLES are found out.



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