Consider a double-paned window consisting of two panes ofglass, each with a thickness of 0.500 cm and an area of 0.725 m2,separated by a layer of air with a thickness of 1.75 cm. The temperature on one side of the window is 0.00 °C; the temperature on theother side is 20.0 °C. In addition, note that the thermal conductivity of glass is roughly 36 times greater than that of air. (a) Approximate the heat transfer through this window by ignoring the glass.That is, calculate the heat flow per second through 1.75 cm of airwith a temperature difference of 20.0 C°. (The exact result for thecomplete window is 19.1 J>s.) (b) Use the approximate heat flowfound in part (a) to find an approximate temperature differenceacross each pane of glass. (The exact result is 0.157 C°.)
Consider a double-paned window consisting of two panes of
glass, each with a thickness of 0.500 cm and an area of 0.725 m2
,
separated by a layer of air with a thickness of 1.75 cm. The temperature on one side of the window is 0.00 °C; the temperature on the
other side is 20.0 °C. In addition, note that the thermal conductivity of glass is roughly 36 times greater than that of air. (a) Approximate the heat transfer through this window by ignoring the glass.
That is, calculate the heat flow per second through 1.75 cm of air
with a temperature difference of 20.0 C°. (The exact result for the
complete window is 19.1 J>s.) (b) Use the approximate heat flow
found in part (a) to find an approximate temperature difference
across each pane of glass. (The exact result is 0.157 C°.)
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