A window with area 1.6 m2 is made from a single pane of 3.0 mm thick glass.(Figu

ID: 1400791 • Letter: A

Question

A window with area 1.6 m2 is made from a single pane of 3.0 mm thick glass.(Figure 1)

Part A

If it's 20 C colder outdoors than inside, what's the heat-flow rate through the window?

Express your answer to two significant figures and include the appropriate units.

ANSWER 8500 WATTS

Part B

Repeat for a double-pane window made from the same glass, with a 2.0 mm air gap between the panes.

Express your answer to two significant figures and include the appropriate units.

I have 350 W for part B and it says its thge wrong answer

given,

area of the window = 1.6 m^2

thickness of the pane = 3 mm

temperature difference = 20 degree celcius

rate of heat flow = thermal conductivity of glass * area * change in temprature / thickness

thermal conductivity = 0.8 W / m K

rate of heat flow = 0.8 * 1.6 * 20 / (3 * 10^-3)

rate of heat flow = 8533.33 W

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