Two thin radiation shields with emissivities of 3 = 0.10 and 4 = 0.15 on

Two thin radiation shields with emissivities of ε₃ = 0.10 and ε₄ = 0.15 on both sides are placed between two very large parallel plates, which are maintained at uniform temperatures T₁ = 600 K and T₂ = 300 K and have emissivities ε₁ = 0.6 and ε₂ = 0.7, respectively (Fig. P13–93). Determine the net rates of radiation heat transfer between the two plates with and without the shields per unit surface area of the plates, and the temperatures of the radiation shields in steady operation.

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T₁ = 600 K &₁ = 0.6 T₂ = 300 K &2 = 0.7 83 = 0.10 84 = 0.15