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13.79 The spectral absorptivity of a large diffuse surface is a = 0.9 for à < 1 µm and az = 0.3 for à > 1 µm. TI he surface is well insulated, while the top may be exposed to one of two different conditions. Ep Tp h, T h, T T- T תיצפלועיייו Case (a) Case (b) TATI

13.79 The spectral absorptivity of a large diffuse surface is a = 0.9 for à < 1 µm and az = 0.3 for à > 1 µm. TI he surface is well insulated, while the top may be exposed to one of two different conditions. Ep Tp h, T h, T T- T תיצפלועיייו Case (a) Case (b) TATI

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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13.79 The spectral absorptivity of a large diffuse surface is a = 0.9 for À < 1 µm and a = 0.3 for à > 1 µm. The bottom of the surface is well insulated, while the top may be exposed to one of two different conditions. Eps Tp h, T h, T T T Case (a) Case (b) (a) In case ( a) the surface is exposed to the sun, which provides an irradiation of G s = 1200 W/m2, and to an airflow for which T, = 30o K. If the surface temperature is T = 320 K, what is the convection coefficient associated with the airflow?
Transcribed Image Text:13.79 The spectral absorptivity of a large diffuse surface is a = 0.9 for À < 1 µm and a = 0.3 for à > 1 µm. The bottom of the surface is well insulated, while the top may be exposed to one of two different conditions. Eps Tp h, T h, T T T Case (a) Case (b) (a) In case ( a) the surface is exposed to the sun, which provides an irradiation of G s = 1200 W/m2, and to an airflow for which T, = 30o K. If the surface temperature is T = 320 K, what is the convection coefficient associated with the airflow?
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