A concrete wall, which has a surface area of 20 m2 and is
Chapter , Problem 1.3(choose chapter or problem)
A concrete wall, which has a surface area of 20 m2 and is 0.30 m thick, separates conditioned room air from ambient air. The temperature of the inner surface of the wall is maintained at 25 C, and the thermal conductivity of the concrete is 1 W/mK. (a) Determine the heat loss through the wall for outer surface temperatures ranging from 15 C to 38 C, which correspond to winter and summer extremes, respectively. Display your results graphically. (b) On your graph, also plot the heat loss as a function of the outer surface temperature for wall materials having thermal conductivities of 0.75 and 1.25 W/mK. Explain the family of curves you have obtained.
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