A double-glazed window consists of two panes ofglass, each
Chapter 13, Problem 13.101(choose chapter or problem)
A double-glazed window consists of two panes ofglass, each of thickness t?6 mm. The inside roomtemperature is Ti?20?C with hi?7.7 W/m2?K,while the outside temperature is To??10?C withho?25 W/m2?K. The gap between the glass sheetsis of thickness L ?5 mm and is filled with a gas. Theglass surfaces may be treated with a low-emissivitycoating to reduce their emissivity from ??0.95 to ??0.05. Determine the heat flux through the windowfor case 1: ?1??2?0.95, case 2: ?1??2?0.05, andcase 3: ?1?0.05, ?2?0.95. Consider either air orargon of thermal conductivity kAr?17.7?10?3W/m?K to be within the gap. Radiation heat transferoccurring at the external surfaces of the two glasssheets is negligible, as is free convection between theglass sheets.
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