19.12 A certain double-pane window consists of two glass sheets, each 80 cm x 80 cm x 0.30 cm, separated by a 0.30-cm stagnant air space. The indoor surface temperature is 20 °C, while the outdoor surface temperature is exactly 0°C. How much heat passes through the window each second? kr = 0.84 W/K -m for glass and about 0.080 W/K m for air. Ans. 69 cal/s
19.12 A certain double-pane window consists of two glass sheets, each 80 cm x 80 cm x 0.30 cm, separated by a 0.30-cm stagnant air space. The indoor surface temperature is 20 °C, while the outdoor surface temperature is exactly 0°C. How much heat passes through the window each second? kr = 0.84 W/K -m for glass and about 0.080 W/K m for air. Ans. 69 cal/s
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pls help me get the answer 69 cal/s
Transcribed Image Text:19.12 A certain double-pane window consists of two glass sheets, each 80 cm x 80 cm x 0.30 cm, separated by a
0.30-cm stagnant air space. The indoor surface temperature is 20 °C, while the outdoor surface temperature
is exactly 0°C. How much heat passes through the window each second? kr = 0.84 W/K m for glass and
%3D
about 0.080 W/K-m for air.
Ans. 69 cal/s
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