Solved: Solar radiation incident on the earths surface may

Chapter , Problem 12.1

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Solar radiation incident on the earths surface may be divided into the direct and diffuse components described in 12.9. Consider conditions for a day in which the intensity of the direct solar radiation is Idir 210 107 W/m2 sr in the solid angle subtended by the sun with respect to the earth, s 6.74 105 sr. The intensity of the diffuse radiation is Idif 70 W/m2 sr. (a) What is the total solar irradiation at the earths surface when the direct radiation is incident at 30 ? (b) Verify the prescribed value for s, recognizing that the diameter of the sun is 1.39 109 m and the distance between the sun and the earth is 1.496 1011 m (1 astronomical unit). 12.11