A concrete wall, which has a surface area of 20 m2 and is0.30 m thick, separates conditioned room air from ambient air.The temperature of the inner surface of the wall is maintainedat 25C, and the thermal conductivity of the concrete is 1 W/m # K.(a) Determine the heat transfer rate through the wall for outersurface temperatures ranging from 15C to 38C, whichcorrespond to winter and summer extremes, respectively.Display your results graphically.(b) On your graph, also plot the heat transfer rate as a functionof the outer surface temperature for wall materials havingthermal conductivities of 0.75 and Explainthe family of curves you have obtained.
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