Solution: The average thermal conductivity of the walls
Chapter 20, Problem 78(choose chapter or problem)
The average thermal conductivity of the walls (including the windows) and roof of the house depicted in Figure P20.78 is 0.480 W/m ? C, and their average thickness is 21.0 cm. The house is kept warm with natural gas having a heat of combustion (that is, the energy provided per cubic meter of gas burned) of 9 300 kcal/m3. How many cubic meters of gas must be burned each day to maintain an inside temperature of 25.0C if the outside temperature is 0.0C? Disregard radiation and the energy transferred by heat through the ground.
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