Two concentric spheres are maintained at uniform temperatures T 1 45C and T 2 280C and have emissivities 1 0 25 and 2 0 7, respectively If the ratio of the diameters is 1 2 0 30, the net rate of radiation heat transfer between the two spheres per unit surface area of the inner sphere is (a) 86 W m ...

The net rate of radiation heat transfer between two concentric spheres is given by Q 1 2 A1 ...

Two concentric spheres are maintained at uniform temperatures T 1 = 45C and T 2 = 280C

Question:

Two concentric spheres are maintained at uniform temperatures T₁ = 45°C and T₂ = 280°C and have emissivities ε₁ = 0.25 and ε₂ = 0.7, respectively. If the ratio of the diameters is Δ₁/Δ₂ = 0.30, the net rate of radiation heat transfer between the two spheres per unit surface area of the inner sphere is
(a) 86 W/m²

(b) 1169 W/m²

(d) 2510 W/m²

(e) 3306 W/m²

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