A house has a rectangular base and a roof that peaks along a line above the center
Question:
A house has a rectangular base and a roof that peaks along a line above the center of the house and parallel to the length of the house. This roof slopes downward from the peak to each edge at an angle of deg with the horizontal. The length of the front of the house is ?meters. The width of the house is ?meters. The height from the front of the house up to the edge of the roof is ?meters.
The average thermal conductivity of the walls including the windows ?and roof of the house depicted in the figure is ?Wm deg C ?and their average thickness is ?cm ?The heat of combustion that is ?the energy provided per cubic meter ?of natural gas is ?Jm
a
How many cubic meters of gas must be burned each day to maintain an inside temperature of deg C in this house if the outside temperature is deg C ?Disregard radiation and the energy transferred by heat through the ground.
?m
b
How will the answer to part a ?be affected increase or decrease the gas requirements ?by the inclusion of thermal conduction through the floor; radiation incident on the roof, walls and windows during the daytime; operation of appliances, computers, entertainment systems; and leakage of air through cracks around doors and windows.
i
thermal conduction through the floor
increase
decrease
ii
radiation incident on the roof, walls and windows during the daytime
increase
decrease
iii
operation of appliances, computers, entertainment systems
increase
decrease
iv
leakage of air through cracks around doors and windows
increase
decrease