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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)Â Â 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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