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A room has a window fitted with a single 1.0 m × 2.0 m glass of thickness 2 mm. (a) Calculate the rate of heat flow through the closed window when the temperature inside the room is 32∘C and that outside is 40∘C. (b) The glass is now replaced by two glasspanes, each having a thickness of 1 mm and separated by a distance of 1 mm. Calculate the rate of heat flow under the same cnditions of temperature. Thermal conductivity of window glass = 1.0Js−1m−1∘C−1 and that of air = 0.025Js−1m−1∘C−1. |
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Answer» A room has a window fitted with a single 1.0 m × 2.0 m glass of thickness 2 mm. (a) Calculate the rate of heat flow through the closed window when the temperature inside the room is 32∘C and that outside is 40∘C. (b) The glass is now replaced by two glasspanes, each having a thickness of 1 mm and separated by a distance of 1 mm. Calculate the rate of heat flow under the same cnditions of temperature. Thermal conductivity of window glass = 1.0Js−1m−1∘C−1 and that of air = 0.025Js−1m−1∘C−1. |
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