Two concentric spheres of diameter Di = 0.7 mand D2 = 1.2 mare separated by an air space and have surface temperatures of T1 = 400 Kand T2 = 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 e = 0.5 and €2 = 0.05, in W? 912 = i w (c) What is the net rate of radiation exchange if Dz is increased to 20 m, with ez = 0.05, e1 = 0.5, and Di = 0.7 m, in W? w 912 = (d) What is the net rate of radiation exchange if the larger sphere behaves as a black body (e2 = 1.0) and with e = 0.5, D2 = 20 m, and Di = 0.7 m, in W? 912 = i
Two concentric spheres of diameter Di = 0.7 mand D2 = 1.2 mare separated by an air space and have surface temperatures of T1 = 400 Kand T2 = 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 e = 0.5 and €2 = 0.05, in W? 912 = i w (c) What is the net rate of radiation exchange if Dz is increased to 20 m, with ez = 0.05, e1 = 0.5, and Di = 0.7 m, in W? w 912 = (d) What is the net rate of radiation exchange if the larger sphere behaves as a black body (e2 = 1.0) and with e = 0.5, D2 = 20 m, and Di = 0.7 m, in W? 912 = i
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.
Chapter1: Basic Modes Of Heat Transfer
Section: Chapter Questions
Problem 1.30P
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