A 5 -m-wide 3 -m-high wall is constructed of one layer of common brick (k=0.72W/mK) of thickness 20cm. The inner surface of the wall is maintained at 25C while the outer surface is exposed to outdoors at 10C with a combined convection and radiation heat transfer coefficient of 17W/m2K. An insulation is to be added to the outside part of the wall to decrease the heat loss by 85%. Determine the thickness of insulation and the outer surface temperature if the wall is insulated with polyurethane foam (k=0.025W/mK)