Two concentric spheres of diameter D₁ = 0.9 m and D₂ = T₁ = 400 K and T₂ = 300 K. 1.2 m are separated by an air space an

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Two Concentric Spheres Of Diameter D 0 9 M And D T 400 K And T 300 K 1 2 M Are Separated By An Air Space An 1 (45.82 KiB) Viewed 30 times

Two concentric spheres of diameter D₁ = 0.9 m and D₂ = T₁ = 400 K and T₂ = 300 K. 1.2 m are separated by an air space and have surface temperatures of (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 &₁ = 0.5 and ₂ = 0.05, in W? 912 W (c) What is the net rate of radiation exchange if D₂ is increased to 20 m, with 2 = 0.05, ₁ = 0.5, and D₁ = 0.9 m, in W? W 912 (d) What is the net rate of radiation exchange if the larger sphere behaves as a black body (₂ = 1.0) and with ₁ = 0.5, D₂ = 20 m, and D₁ = 0.9 m, in W? 912 = i W