Effect of a Window in a Door. A carpenter builds a solid
Chapter 17, Problem 107P(choose chapter or problem)
Effect of a Window in a Door. A carpenter builds a solid wood door with dimensions 2.00 m X 0.95 m X 5.0 cm. Its thermal conductivity is k = 0.120 W/m ? K. The air films on the inner and outer surfaces of the door have the same combined thermal resistance as an additional 1.8-cm thickness of solid wood. The inside air temperature is 20.0o C, and the outside air temperature is - 8.0o C. (a) What is the rate of heat flow through the door? (b) By what factor is the heat flow increased if a window 0.500 m on a side is inserted in the door? The glass is 0.450 cm thick, and the glass has a thermal conductivity of 0.80 W/m ? K. The air films on the two sides of the glass have a total thermal resistance that is the same as an additional 12.0 cm of glass.
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