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2. An oven wall consists of a 0.635 cm thick layer of steel (ks = 15.1 W/m-K) and a layer of brick (kp= 0.72 W/m-K). At steady state, a temperature

decrease of 0.7 °C occurs over the steel layer.The inner temperature of the steel layer is 300 °C. If the temperature of the outer surface of the brick must be no greater than 40 °C, determine the thickness brick, in cm, that ensures this limit is met. What is the rate of conduction, in kW per m? of wall surface area?

Fig: 1

Fig: 2