lecture30_note

# lecture30_note - Poured Concrete R=0.08 inch Single pane...

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Single pane glass window: R = 0.9 Double pane glass window: R = 1.6 Wood panels, such as sheathing: R=2.5 / inch Fiberglass: R = 2.2 to 4 / inch Poured Concrete: R=0.08 / inch Spray foam: R= 4 to 7 / inch

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A copper pot containing boiling water sits on a hot stove element. The temperature of the water is 100 ° C. The bottom of the pot has an area of 0.04 m 2 and a thickness of 4 x 10 -3 m. k for copper is 400 W/(m K). If the stove element outputs 4000 W of heat to the pot, what is the temperature difference T across the copper bottom of the pot? T = ?

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Unformatted text preview: A. 0.1 ° C B. 1 ° C C. 10 ° C D. 100 ° C E. 400 ° C k g /L g for a single-pane window with 1/8" thick glass is 25 times larger than k w /L w for a fiberglass-insulated exterior wall with a thickness of 6". What area of wall will conduct the same amount of heat from the inside to the outside of a house as a 4 m 2 window? A = ? A. 0.1 m 2 B. 1 m 2 C. 10 m 2 D. 100 m 2 E. 1000 m 2 Heat Transfer by Convection Gas convection between two horizontal glass plates,with heating from below Apparent Color of a “black body” vs. temperature...
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