6. A house wall is made up of a sandwich of a 10 cm-wide brick at its core, 5 cm-thick loosely packed asbestos on the outside and 1.25 cm thick fiber insulating board on the inside surface of the wall. If the thermal conductivities are 0.05, 0.70 and 0.15, respectively, then find the effective thermal conductivity of the wall. If the convective heat transfer coefficient both inside and outside the house is 10 W/m2K, then find the cooling load on an air conditioner from a house of length x width x height of 10 mx 8 m x 4 m when the temperature inside the house is to be maintained at 24C and when the outside is at 45C. What would have been the cooling load if only a brick wall of 20 cm thickness were to be used