Thermodynamics HW Solutions 902

Thermodynamics HW Solutions 902 - Chapter 11 Fundamentals...

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Unformatted text preview: Chapter 11 Fundamentals of Thermal Radiation 11-83 The variation of absorptivity of a surface with wavelength is given. The surface receives solar radiation at a specified rate. The solar absorptivity of the surface and the rate of absorption of solar radiation are to be determined. Analysis For solar radiation, T = 5800 K. The solar absorptivity of the surface is , m 0.3 1.2 0.8 0.1 0 805713 . f mK 6960 = K) m)(5800 2 . 1 ( 033454 . f mK 1740 = K) m)(5800 3 . ( 2 1 2 1 = = = = T T 0.621 = + + = ) 805713 . 1 )( . ( ) 033454 . 805713 . )( 8 . ( 033454 . ) 1 . ( The rate of absorption of solar radiation is determined from 2 W/m 509 = = = ) W/m 820 ( 621 . 2 absorbed I E 11-84 The spectral transmissivity of a glass cover used in a solar collector is given. Solar radiation is incident on the collector. The solar flux incident on the absorber plate, the transmissivity of the glass cover for radiation emitted by the absorber plate, and the rate of heat transfer to the cooling water are to be...
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