Question

a one brick thick wall of 10cm thickness has temperatures 40deg C and 5deg C at the surfaces. if the thermal conductivity of the brick is 0.6W per m per K, what is the rate of heat flow per unit area W per m square through the bricks if steady state conditions apply?
explain why under these conditions, the temperature of the outer surface of the wall must be greater than the air temperature. At what rate must the outer surface be losing heat?
q = α•ΔT/Δx =0.6•35/0.1 = 210 W/m²

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