A brick wall of thickness 250 mm is faced with a smooth cast finish of concrete with thickness of 50 mm. The thermal conductivity of the brick and concrete are 0.69 W/m.K and 0.93 W/m.K respectively. If the exposed brick face is at a temperature of 30 C and concrete at 5 C; and taking the wall to be a length of 6.707 m and height of 3.041 m, determine: a) The heat loss per hour in kJ. b) The interface temperature. c) The heat loss per hour if it were the brick section only in kJ. d) The heat loss per hour if it were the concrete section only in kJ.