Consider a material that is gray, but directionally selective with (, ) 0 5(1 cos ) Determine the hemispherical absorptivity when collimated solar flux irradiates the surface of the material in the direction 45 and 0 Determine the hemispherical emissivity B of the material

Question: Consider a material that is gray, but directionally selective with (, ) = 0.5(1 cos ). Determine the hemispherical absorptivity when collimated

Consider a material that is gray, but directionally selective with αθ (θ, Φ) = 0.5(1 – cos Φ). Determine the hemispherical absorptivity α when collimated solar flux irradiates the surface of the material in the direction θ = 45° and Φ = 0°. Determine the hemispherical emissivity B of the material.

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