To reduce heat transfer losses through a glass window, you consider replacing the window with one of three alternatives: a sheet of tin 0.50 cm thick, a layer of brick 8.0 cm thick, and a combination of wood and insulation 4.0 cm thick. The original thickness of the glass is 1.0 cm. Consider the thermal conductivities of each to be as follows: glass—1.40 W/m?K; tin— 66.6 W/m?K; brick—1.20 W/m?K; wood/insulation combination—0.09 W/m?K. Considering the inside temperature of the surface to be 20.0°C and the outside temperature to be –5.0°C, determine the heat conduction rate per unit area for the glass and the three alternatives, and discuss the relative merits of the three alternatives (ignoring material and installation costs).
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