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Unformatted text preview: MAE118A: Introduction to Energy Systems Quiz 3 : Radiative Heat Transfer Kowsik Bodi November 18, 2009 Visible light with intensity I vis ( W / m 2 ) passes through a perfectly transmitting window. No visible light is reflected from the window surface. This light is then perfectly absorbed at a surface as shown in the schematic above. This surface warms and emits an infra-red (IR) radiation flux E S ( W / m 2 ) . This IR radiation passes back through the window which has a finite IR transmission coefficient, < 1 . A fraction (1- ) of the IR radiation is absorbed by the window which then also warms. The warmed window then re-emits this radiation with a flux E w ( W / m 2 ) of which half is emitted to space (at a temperature of deg K) and half is emitted back towards the surface. 1 a ) Write an expression for the absorbed power flux, A , which the window receives in terms of E s . (5 Points) If we consider the window alone, from energy conservation, we know that all the incdient energy is either reflected, transmitted, or absorbed. Inthat all the incdient energy is either reflected, transmitted, or absorbed....
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This note was uploaded on 02/03/2010 for the course MAE MAE118A taught by Professor Kowsikbodi during the Fall '09 term at UCSD.
- Fall '09
- Heat Transfer