Hot coffee is contained in a cylindrical thermos bottle that is of length L 0 3 m and is lying on its side (horizontally) The coffee container consists of a glass flask of diameter D 1 0 07 m, separated from an aluminum housing of diameter D 2 0 08 m by air at atmospheric pressure The outer surface of the flask and the inner surface of the housing are silver coated to provide emissivities of 1 2 0 25 If these surface temperatures are T 1 75 C and T 2 35 C, what is the heat loss from the coffee Coffee D, D Air space Insulation strip

Question: Hot coffee is contained in a cylindrical thermos bottle that is of length L = 0.3 m and is lying on its side (horizontally). The

Hot coffee is contained in a cylindrical thermos bottle that is of length L = 0.3 m and is lying on its side (horizontally). The coffee container consists of a glass flask of diameter D₁ = 0.07 m, separated from an aluminum housing of diameter D₂ = 0.08 m by air at atmospheric pressure. The outer surface of the flask and the inner surface of the housing are silver coated to provide emissivities of ?₁ = ?₂ = 0.25. If these surface temperatures are T₁ = 75? C and T₂ = 35?C, what is the heat loss from the coffee?

Coffee D, D Air space Insulation strip

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