When analyzing heat transfer through windows, it is important to consider the frame as well as the glass area. Consider a 2-m-wide, 1.5-m-high wood-framed window with 85 percent of the area covered by 3-mm-thick single-pane glass (k = 0.7 W/m·K). The frame is 5 cm thick, and is made of pine wood (k = 0.12 W/m·K). The heat transfer coefficient is 7 W/m2·K inside and 13 W/m2·K outside. The room is maintained at 24°C, and the outdoor temperature is 40°C. Determine the percent error involved in heat transfer when the window is assumed to consist of glass only.
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