A 1.0 mx 1.5 m double-pane window consists of two mm-thick layers of glass (k = 0.78 W/m-K) that are the separated by a 5-mm air gap (kair= 0.025 W/m K). The heat flow through the air gap is assumed to be by conduction. The inside and outside air temperatures are 20°C and -20°C, respectively, and the inside and outside heat transfer coefficients are 40 and 20 W/m² oC determine the daily rate of heat loss through the window in steady operation.

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A 1.0 mx 1.5 m double-pane window consists of two mm-thick layers of glass (k = 0.78 W/m-K) that are the
separated by a 5-mm air gap (kair= 0.025 W/m K). The heat flow through the air gap is assumed to be by
conduction. The inside and outside air temperatures are 20°C and -20°C, respectively, and the inside and outside
heat transfer coefficients are 40 and 20 W/m² oC determine the daily rate of heat loss through the window in
steady operation.
Transcribed Image Text:A 1.0 mx 1.5 m double-pane window consists of two mm-thick layers of glass (k = 0.78 W/m-K) that are the separated by a 5-mm air gap (kair= 0.025 W/m K). The heat flow through the air gap is assumed to be by conduction. The inside and outside air temperatures are 20°C and -20°C, respectively, and the inside and outside heat transfer coefficients are 40 and 20 W/m² oC determine the daily rate of heat loss through the window in steady operation.
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