Two concentric spheres of diameter D₁ = 0.8 m and D₂ = 1.2 m are separated by an air space and have surface temperatures of T₁ - 410 K and T₂ = 300 K. = (a) If the surfaces are black, what is the net rate of radiation exchange between the spheres, in W? 912 = (b) What is the net rate of radiation exchange between the surfaces if they are diffuse and gray with ₁ = 0.5 and … -0.05, in W? W 912 = W (c) What is the net rate of radiation exchange if is increased to 20 m, with ₂ - 0.05, ₁ = ( D₂ 0.5, and 0.8 m, in W? D₁ = 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 D₁ = 0.8 m, in W? 912 =
Two concentric spheres of diameter D₁ = 0.8 m and D₂ = 1.2 m are separated by an air space and have surface temperatures of T₁ - 410 K and T₂ = 300 K. = (a) If the surfaces are black, what is the net rate of radiation exchange between the spheres, in W? 912 = (b) What is the net rate of radiation exchange between the surfaces if they are diffuse and gray with ₁ = 0.5 and … -0.05, in W? W 912 = W (c) What is the net rate of radiation exchange if is increased to 20 m, with ₂ - 0.05, ₁ = ( D₂ 0.5, and 0.8 m, in W? D₁ = 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 D₁ = 0.8 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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Heat transfer
Transcribed Image Text:Two concentric spheres of diameter D₁ = 0.8 m
and D₂ = 1.2 m are separated by an air space and
have surface temperatures of T = 410 K and ₂ =
300 K.
T₁
(a) If the surfaces are black, what is the net rate
of radiation exchange between the spheres, in
W?
912 =
(b) What is the net rate of radiation exchange
between the surfaces if they are diffuse and
gray with = 0.5 and 0.05, in W?
E
W
912 =
W
(c) What is the net rate of radiation exchange if
is increased to 20 m, with = 0.05,= 0.5, and
0.8 m, in W?
D₂
82=
D₁ =
W
912=
(d) What is the net rate of radiation exchange if
the larger sphere behaves as a black body (42=
E
1.0) and with ₁ = 0.5, D₂ = 20 m, and D₁ = 0.8 m, in
W?
912 =
W
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