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The process of calculating the solar constant and radiant heat flux on earth's surface using the principles of solar engineering. The document assumes the sun behaves as a black body and uses shape factor and data from figure 2.1 of principles of solar engineering. The document also provides instructions for finding the solar constant for a small surface in salem, or, at different solstices.
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Calculate the solar constant from basic radiation heat transfer. Treat the sun as a black body that radiates equally in all directions. Calculate the radiant heat flux on the surface of the earth, using data from Figure 2.1 of Principles of Solar Engineering by Goswami, Kreith, and Kreider. Note that the shape factor from a small surface 1 of area A 1 to a sphere 2 with surface area A 2 , illustrated below, is F 12 = (h/R)^2.
Next, ignoring any attenuation due to the atmosphere, find the solar constant for the same A 1 = 1.0 m^2 located in Salem, OR, at latitude = 45° on June 21 (summer solstice). What is in on December 21 (winter solstice)?
h (^2 )