Application of Concrete Filled Steel Tubes in Solar Module …
53.1.1 Tracking Mechanism. The solar energy which reaches the earth''s surface may vary from 1025 W/m 2 in a clear sky to 550 W/m 2 in a cloudy sky [].The sun rises from the east and sets in the west direction during the day, which implies that the sun ray does not fall vertically on the surface all the time.