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The details of the three little pigs's house:

  • The walls are made of 10-cm thick bricks, insulated with

5 cm of fibreglass. They cover a total area of 45 m^2

  • The floor is thick and well insulated. 
  • The 15-m^2 roof is made out of ceramic tiles that are 2.5 cm thick and insulated with 5-cm thick fibreglass. 
  • The door is 3.5-cm thick solid wood with an area of 2.0 m^2.
  • There are double-paned windows with a combined area of 4.0 m^2.
  • Each window is identical, having two 3-mm thick glass panes with a 2-mm air gap between the panes.
  • An electric heater heats the house's interior. The pigs themselves contribute in heating via metabolic power (each pig contributes ? meta = 100 W).
  • Before we calculate the power provided by the heater, we need to know how much heat is being transferred out through the different surfaces of the house (roof, door, windows, and walls). The table of conductivity values is given below.


    Assuming that each pig contributes 100 W of metabolic power, calculate the power required from the heater to maintain the inside temperature at 20∘C, when the outside temperature is 8.5∘C. Give your answer in W.

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