What is the net rate of radiation exchange

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Reference no: EM13942325

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 = 400 K and T₂ = 300 K.

(a) If the surfaces are black, what is the net rate of radiation exchange between the spheres?

(b) What is the net rate of radiation exchange between the surfaces if they are diffuse and gray with s₁ = 0.5 and s₂ = 0.05?

(c) What is the net rate of radiation exchange if D₂ is increased to 20 m, with s₂ = 0.05, s1 = 0.5, and D1 = 0.8 m? What error would be introduced by assuming blackbody behavior for the outer sur- face (s2 = 1), with all other conditions remaining the same?

(d) For D₂ = 1.2 m and emissivities of s₁ = 0.1, 0.5, and 1.0, compute and plot the net rate of radiation exchange as a function of s2 for 0.05 s2 1.0.

Reference no: EM13942325

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