Fused quartz transmits 90 percent of the incident thermal radiation between 0.2 and 4 µm. Suppose a certain heat source is viewed through a quartz window. What heat flux in watts will be transmitted through the material from blackbody radiation sources at (a) 800◦C, (b) 550◦C, (c) 250◦C, and (d ) 70◦C? (Holman, 2002)

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
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Author:Kreith, Frank; Manglik, Raj M.
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Chapter11: Heat Transfer By Radiation
Section: Chapter Questions
Problem 11.2P: A tungsten filament is heated to 2700 K. At what wavelength is the maximum amount of radiation...
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Fused quartz transmits 90 percent of the incident thermal radiation between 0.2 and 4
µm. Suppose a certain heat source is viewed through a quartz window. What heat flux in
watts will be transmitted through the material from blackbody radiation sources at (a)
800◦C, (b) 550◦C, (c) 250◦C, and (d ) 70◦C? (Holman, 2002)

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