A 18-M² Thermopane Window Is Constructed,using Two Layers of Glass 5

question 8

Multiple Choice

A 1.8-m² Thermopane window is constructed,using two layers of glass 5.0 mm thick,separated by an air space of 6.0 mm.If the temperature difference is 22 °C from the inside of the house to the outside air,what is the rate of heat flow through this window? (Thermal conductivity for glass is 0.84 J/s⋅m⋅°C and for air 0.023 4 J/s⋅m⋅°C. )

• A) 1,800 W
• B) 300 W
• C) 2250 W
• D) 150 W
• E) ​1,500

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