The roof of an airconditioned home is 4.5 m long, 10 m wide, and 0.45 m thick, and is made of
a flat layer of concrete whose thermal conductivity is k = 1.25 W/m.K. The temperatures of the
inner and outer surfaces of the roof one day are measured to be 25°C and 40°C, respectively
for a period of 7 hours.
Determine:
a) The rate of heat gained through the roof that night and
b) The cost of that heat gained to the home owner if the cost of electricity is USD 1.5 per kWh.
conridernarinn standing in a continuously heated room at 27°C, Determine the total rate of
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