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 angleI 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

The vector sum of the components along the line normal of the titled s

1.	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 angleI 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» 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.

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