a 4m high by 25m wide wall of a house composed of two bricks of length 0.1m with a 0.05m gap in between. The temperature inside the room is 25 degree Celsius and the temperature outside the house is 5 degrees Celsius. Determine the heat transfer through the wall when: a) The gap is filled with cotton wool insulation. b) The gap is filled with foam insulation. Assume the thermal conductivity of the brick is 0.08W/m.k, the thermal conductivity of the cotton wool insulation is 0.029 W/m.k, the thermal conductivity of the foam insulation is 0.045 W/m.k, the convection coefficient inside the house is 5 W/m^2./k and the convection coefficient outside the house is 100 W/m^2.k