A solar collector consists of a long duct through which air is blown; its cross section forms an equilateral triangle 1 m on a side. One side consists of a glass cover of emissivity ?₁ = 0.9, while the other two sides are absorber plates with ?₂ = ?₃ = 1.0. During operation the surface temperatures are known to be T₁ = 25?C, T₂ = 60?C, and T_3?= 70?C. What is the net rate at which radiation is transferred to the cover due to exchange with the absorber plates?

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Glass cover Absorber plates E, T; Eg, T-