Two concentric spheres of diameter Di = 0.7 m and D2 = 1.2 m are separated by an air space and have surface temperatures of T = 390 K and T, = 300 K. (a) If the surfaces are black, what is the net rate of radiation exchange between the spheres, in W? 912 w (b) What is the net rate of radiation exchange between the surfaces if they are diffuse and gray with e1 = 0.5 and €2 = 0.05, in w? 912 = w (c) What is the net rate of radiation exchange if D, is increased to 20 m, with ez = 0.05, ej = 0.5, and Di = 0.7 m, in W? 912 w (d) What is the net rate of radiation exchange if the larger sphere behaves as a black body (€2 = 1.0) and with & = 0.5, D2 = 20 m, and Di = 0.7 m, in W? 912 =
Two concentric spheres of diameter Di = 0.7 m and D2 = 1.2 m are separated by an air space and have surface temperatures of T = 390 K and T, = 300 K. (a) If the surfaces are black, what is the net rate of radiation exchange between the spheres, in W? 912 w (b) What is the net rate of radiation exchange between the surfaces if they are diffuse and gray with e1 = 0.5 and €2 = 0.05, in w? 912 = w (c) What is the net rate of radiation exchange if D, is increased to 20 m, with ez = 0.05, ej = 0.5, and Di = 0.7 m, in W? 912 w (d) What is the net rate of radiation exchange if the larger sphere behaves as a black body (€2 = 1.0) and with & = 0.5, D2 = 20 m, and Di = 0.7 m, in W? 912 =
Elements Of Electromagnetics
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ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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
Transcribed Image Text:Two concentric spheres of diameter D1
of T1 = 390 Kand T, = 300 K.
= 0.7 m and D2 = 1.2 mare separated by an air space and have surface temperatures
(a) If the surfaces are black, what is the net rate of radiation exchange between the spheres, in W?
912
w
(b) What is the net rate of radiation exchange between the surfaces if they are diffuse and gray with & = 0.5 and &2 = 0.05, in
W?
912
(c) What is the net rate of radiation exchange if D2 is increased to 20 m, with ez = 0.05, e1 = 0.5, and Di = 0.7 m, in w?
412 =
(d) What is the net rate of radiation exchange if the larger sphere behaves as a black body (82 = 1.0) and with ej = 0.5, D2 =
20 m, and Di = 0.7 m, in W?
i
w
912 =
Physical Properties Mathematical Functions
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