Consider the attic of a home located in a hot climate. The floor of the attic is characterized by a width of L₁ = 10 m while the roof makes an angle of θ = 30°from the horizontal direction, as shown in the schematic. The homeowner wishes to reduce the heat load to the home by adhering bright aluminum foil (ε_f = 0.07) onto the surfaces of the attic space. Prior to installation of the foil, the surfaces are of emissivity ε_o = 0.85.

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-A₁, 1, T₁ Attic A2, 2. T2 0-30° 4 = 10 m