Two concentric spheres of diameter D1of 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?912w(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, inW?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?iw912 =Physical Properties Mathematical Functions

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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 =

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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