Answer: The average thermal conductivity of the walls

Chapter , Problem 42

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The average thermal conductivity of the walls (including windows) and roof of a house in Figure P11.42 is 4.8 3 1024 kW/m ? C, and their average thickness is 21.0 cm. The house is heated with natural gas, with a heat of combustion (energy released 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 surface air layers, radiation, and energy loss by heat through the ground. 5.00 m 8.00 m 10.0 m 37.0_ Figure P11.42

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