# 1. Your task is to calculate the solar energy striking a 1 meter squa.docx

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1. Your task is to calculate the solar energy striking a 1 meter square, stationary, vertical surface at the Winter Solstice in College Station-30 degrees latitude your answer will be 14.7x10**6 J-keep working until you get it). Assume that the solar irradiation is reduced to 800 W/m because of the added atmospheric air mass due to the sun being lower in the sky at noon, and there are only 10 hrs of daylight. The last problem in the previous HW (emailed to you) was similar except it was the Equinox, 850 W/m , and 12 hrs of daylight (your answer to this previous vertical surface at the Equinox problem was 11.7x10**6J). As before, assume the sun travels across the sky with the projected area following a sinusoidal path, whose period for this problem here is two times the length of daylight or 20 hrs. Of special importance, this is the same path followed by the energy rate hitting the surface-- projected area times the 800 W/m2 solar irradiation. Action: Sketch the energy rate (W) hitting the 1m square surface versus time over the 10 hour day. As before the area under
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