During a winter day, the window of a patio door with
Chapter 9, Problem 9.18(choose chapter or problem)
During a winter day, the window of a patio door with aheight of 1.8 m and width of 1.0 m shows a frostline near its base. The room wall and air temperaturesare 15?C.(a) Explain why the window would show a frost layerat the base rather than at the top.(b) Estimate the heat loss through the window due tofree convection and radiation. Assume the windowhas a uniform temperature of 0?C and the emissiv-ity of the glass surface is 0.94. If the room has elec-tric baseboard heating, estimate the correspondingdaily cost of the window heat loss for a utility rateof 0.18 $/kW?h.
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