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A windowpane is 1.2 m high and 0.6 m wide. The glass is 4 mm thick and has thermal conductivity k = 0.78 W/m-deg C. The temperature of the inner face of the glass is 12 deg C and that of the outer surface is -12 deg C. What is the rate of heat flow through the window? A. 4.3 kW B) 3.4 kW C. 5.4 kW D. 4.5 kW

A windowpane is 1.2 m high and 0.6 m wide. The glass is 4 mm thick and has thermal conductivity k = 0.78 W/m-deg C. The temperature of the inner face of the glass is 12 deg C and that of the outer surface is -12 deg C. What is the rate of heat flow through the window? A. 4.3 kW B) 3.4 kW C. 5.4 kW D. 4.5 kW

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Answer is letter B. Pls explain well T^T

A windowpane is 1.2 m high and 0.6 m wide. The glass is 4 mm thick and has thermal conductivity k = 0.78 W/m-deg C. The temperature of the inner face of the glass is 12 deg C and that of the outer surface is -12 deg C. What is the rate of heat flow through the window? A. 4.3 kW B) 3.4 kW C. 5.4 kW D. 4.5 kW
Transcribed Image Text:A windowpane is 1.2 m high and 0.6 m wide. The glass is 4 mm thick and has thermal conductivity k = 0.78 W/m-deg C. The temperature of the inner face of the glass is 12 deg C and that of the outer surface is -12 deg C. What is the rate of heat flow through the window? A. 4.3 kW B) 3.4 kW C. 5.4 kW D. 4.5 kW
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