Consider a 0.8-m-high and 1.5-m-wide double-pane window consisting of two 4-mm-thick layers of glass (k  0.78 W/m · °C) separated by a 10-mm-wide stagnant air space (k  0.026 W/m · °C). Determine the steady rate of heat transfer through this double-pane window and the temperature of its inner surface for a day during which the room is maintained at 20°C while the temperature of the outdoors is 10°C. Take the convection heat transfer coefficients on the inner and outer surfaces of the window to be h1  10 W/m2 · °C and h2 40 W/m2 · °C, which includes the effects of radiation.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Consider a 0.8-m-high and 1.5-m-wide double-pane window consisting of two 4-mm-thick layers of glass (k  0.78 W/m · °C) separated by a 10-mm-wide stagnant air space (k  0.026 W/m · °C). Determine the steady rate of heat transfer through this double-pane window and the temperature of its inner surface for a day during which the room is maintained at 20°C while the temperature of the outdoors is 10°C. Take the convection heat transfer coefficients on the inner and outer surfaces of the window to be h1  10 W/m2 · °C and h2 40 W/m2 · °C, which includes the effects of radiation.

Glass
Glass
Air
20°C
TNT,
-10°C
4 mm
10 mm
| 4 mm
Transcribed Image Text:Glass Glass Air 20°C TNT, -10°C 4 mm 10 mm | 4 mm
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