1. The heat is transferred steadily and in a unidirectional manner through a wall of an oven. The oven is composed of brick with conductivity of k=0.7W/m.K and thickness of L=10cm. The wall has width of W=2m and a height H=10m. The internal surface of the brick is held at TH= 1000C and the external surface is at Tc=30C. Write all of your assumptions and determine: a) The total rate of heat transfer through the wall. b) The thickness of the brick that is required to limit the rate of heat transfer to 900W