The average thermal conductivity of the walls (includingthe windows) and roof of the
Chapter 20, Problem 78(choose chapter or problem)
The average thermal conductivity of the walls (includingthe windows) and roof of the house depicted inFigure P20.78 is 0.480 W/m ? C, and their averagethickness is 21.0 cm. The house is kept warm withnatural gas having a heat of combustion (that is, theenergy provided per cubic meter of gas burned) of9 300 kcal/m3. How many cubic meters of gas must beburned each day to maintain an inside temperature of25.0C if the outside temperature is 0.0C? Disregardradiation and the energy transferred by heat throughthe ground.
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