ABE-TSM436_Lecture4

# ABE-TSM436_Lecture4 - Solar Radiation What is the maximum...

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2/1/2010 1 Solar Radiation Solar Radiation What is the maximum solar radiation beyond the earth’s atmosphere? How much solar radiation available in the west wall of Agricultural Engineering Building at 3pm, March 30? θ surface sun’s rays

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2/1/2010 2 Topics of the Day * Solar spectrum * Mean solar constant * ASHRAE clear sky model * National solar radiation data base * Collector orientation
2/1/2010 3 Solar Spectrum ¾ Sun’s surface temperature: 5,500 – 6,000 ° C (9,940 – 11,000 ° F) ¾ Electromagnetic radiation (0.1 μ m – 100 m) ¾ Ultraviolet: 0.29 – 0.40 μ m, 9% ¾ Visible: 0.40 – 0.70 μ m, 40% ¾ Infrared: 0.70 – 3.50 μ m, 51% ¾ Peak at 0.48 μ m (green) m T μ λ 6 . 5215 max = T = absolute temperature, Rankine T (R) = t (F) + 459.67

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2/1/2010 4 Spectral Distribution of Solar Radiation m m - air mass air mass w = 30 w = 30 30 mm 30 mm precipitable precipitable water water d = 400 d = 400 400 particles per 400 particles per cubic centimeter cubic centimeter (McQuiston et al., 2005)
2/1/2010 5 Air Mass Ratio m ¾ Air mass ratio is a measure of the amount of atmosphere the sun’s rays must pass through to reach the earth’s surface. (McQuiston et al., 2005)

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6 Mean Solar Constant Mean Solar Constant is the rate of radiation on the surface normal to the sun’s rays beyond the earth’s atmosphere and at the mean earth-sun distance. G sc = 1366 w/m 2 Then, how to calculate the total radiation G t ? ASHRAE clear sky model.
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## This note was uploaded on 01/30/2011 for the course TSM 436 taught by Professor Wang,x during the Spring '08 term at University of Illinois, Urbana Champaign.

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ABE-TSM436_Lecture4 - Solar Radiation What is the maximum...

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