A large diffuse surface has spectral absorptivity of a = 0.9 for <1 μm and a = 0.2 for 2 1 um. The surface is insulated in the bottom, and exposed to two different conditions on the top: sun Tp T. TE T₂ Insulated Insulated Case (1) Case (2) 6-1) Case 1): What is the value of the total hemispherical absorptivity of the large diffuse surface? Note that the sun emits approximately as a blackbody at 5800 K. Blackbody Radiation Functions AT AT (pm-K) (pm-K) 200 0.000000 4,000 0.480877 400 0.000000 4,200 0.516014 600 0.000000 4,400 0.548796 800 0.000016 4,600 0.579280 1,000 0.000321 4,800 0.607559 1.200 0.002134 5,000 0.633747 1,400 0.007790 5.200 0.658970 1,600 0.019718 5,400 0.680360 1,800 0.039341 5,600 0.701046 2,000 0.066728 5,800 0.720158 2.200 0.100888 6,000 0.737818 2,400 0.140256 6,200 0.754140 2,600 0.183120 6,400 0.769234 2,800 0.227897 6,600 0.783199 2,898 0.250108 6,800 0.796129 3,000 0.273232 7,000 0.808109 3,200 0.318102 7,200 0.819217 3,400 0.361735 7,400 0.829527 3,600 0.403607 7,600 0.839102 3,800 0.443382 7,800 0.848005 6-2) Case 1): The surface is exposed to the sun and G₁ = 1200 W/m². Flowing air temperature

A large diffuse surface has spectral absorptivity of a = 0.9 for <1 μm and a = 0.2 for 2 1 um. The surface is insulated in the bottom, and exposed to two different conditions on the top: sun Tp T. TE T₂ Insulated Insulated Case (1) Case (2) 6-1) Case 1): What is the value of the total hemispherical absorptivity of the large diffuse surface? Note that the sun emits approximately as a blackbody at 5800 K. Blackbody Radiation Functions AT AT (pm-K) (pm-K) 200 0.000000 4,000 0.480877 400 0.000000 4,200 0.516014 600 0.000000 4,400 0.548796 800 0.000016 4,600 0.579280 1,000 0.000321 4,800 0.607559 1.200 0.002134 5,000 0.633747 1,400 0.007790 5.200 0.658970 1,600 0.019718 5,400 0.680360 1,800 0.039341 5,600 0.701046 2,000 0.066728 5,800 0.720158 2.200 0.100888 6,000 0.737818 2,400 0.140256 6,200 0.754140 2,600 0.183120 6,400 0.769234 2,800 0.227897 6,600 0.783199 2,898 0.250108 6,800 0.796129 3,000 0.273232 7,000 0.808109 3,200 0.318102 7,200 0.819217 3,400 0.361735 7,400 0.829527 3,600 0.403607 7,600 0.839102 3,800 0.443382 7,800 0.848005 6-2) Case 1): The surface is exposed to the sun and G₁ = 1200 W/m². Flowing air temperature

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter11: Heat Transfer By Radiation

Section: Chapter Questions

Problem 11.68P: 11.68 Two infinitely large, black, plane surfaces are 0.3 m apart, and the space between them is...

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