1. A concrete wall, which has a surface area of 20 m² and is 0.30 m thick, separates conditioned room air from ambient outside 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/m-K. -15 °Ca. Determine the heat loss through the wall for outer surface temperatures ranging from to 38 °C, which correspond to winter and summer extremes. Display your results graphically. b. On the same graph, 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/m-K. Explain your results.