Combustion gases at T [infinity] , 1 = 2500°C are separated from a liquid coolant at T [infinity] , 2 = 150°C by a composite wall composed of a L A = 15-mm thick layer of beryllium oxide on the gas side and a L B = 22-mm thick slab of stainless steel (AISI 304) on the liquid side. If the contact resistance between the oxide and steel is R t , c = 0.03 m2·K/W, find the rate of heat loss per unit surface area of the composite wall. The gas convective coefficient is h 1 = 75 W/m2·K while on the liquid side is h 2 = 1000 W/m2·K.