Question

The vector sum of the components along the line normal of the titled surface in a direction normal to the tilted surface is called as __________

(a) Solar intensity

(b) Declination

(c) Incident angle

(d) Hour angle

I have been asked this question by my school principal while I was bunking the class.

I'd like to ask this question from Solar Radiation Measurement in division Solar Energy of Energy Engineering

Answer 1

Right option is (a) Solar intensity

To explain I would say: The solar intensity at a direction normal to the tilted surface is the vector sum of the components along the line normal of the tilted surface. And is given by formula,

    IΣ = IDN cosθΣ

   Where IDN = solar intensity irradiated on a surface normal to the sun’s rays.