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MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
Professor
Phoniex University
Oct-2001 - Nov-2016
12.10 Solar radiation incident on the earth’s surface may be divided into the direct and diffuse components described in Problem 12.9. Consider conditions for a day in which the intensity of the direct solar radia- tion is Idir = 210 X 107 W/m2 · sr in the solid angle subtended by the sun with respect to the earth, 11ws = 6.74 X 10-5 sr. The intensity of the diffuse radiation is Idif = 70 W/m2 · sr.
(a) What is the total solar irradiation at the earth’s surface when the direct radiation is incident at () = 30°?
(b) Verify the prescribed value for 11ws, recognizing that the diameter of the sun is 1.39 X 109 m and the distance between the sun and the earth is
1.496X 1011 m (1 astronomical unit).
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