The average thermal conductivity of the walls (includingwindows) and roof of a house in Figure P11.32 is 4.8 10-4kW/m°C,and their average thickness is

sjeikdom0

sjeikdom0

Answered question

2021-02-09

The average thermal conductivity of the walls (includingwindows) and roof of a house in Figure P11.32 is 4.8 104kW/mC,and their average thickness is 20.0cm. The house is heated with natural gas, with a heat of combustion(energy given off per cubic meter of gas burned) of 9300kcal/m3. How many cubic meters of gas must be burnedeach day to maintain an inside temperature of 28.0°C if the outside temperature is 0.0C? Disregard radiation and loss by heat through theground.
m3day

Answer & Explanation

Cristiano Sears

Cristiano Sears

Skilled2021-02-10Added 96 answers

The total area is 304 sq m to three significant figures. This is the eqation we used in class.
P=Qt=AR(TfTi)L
Input your numbers and you get:
Q=(304)(.48)(250)(24)(3600)0.210
to convert the energy need to gas needed multiply it by:
1m3(93004186)J
Sorry for the jumps in logic, but it should be pretty easywith some thought. If I just gave it all to you, you wouldn'tlearn much.

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