P2207_fall10_lecture30

P2207_fall10_lecture30 - Today Heat Transfer Mechanisms...

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Today: Heat Transfer Mechanisms: More on Conduction Convection Thermal radiation
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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 = ? A. 0.1 C B. 1 C C. 10 C D. 100 C E. 400 C
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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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Heat Transfer by Convection
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Gas convection between two horizontal glass plates, with heating from below
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Apparent Color of a “black body” vs. temperature Intensity
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An object with a temperature T o (in K) is placed in the middle of a large container whose walls are at T w,i = 0 K. If you raise the temperature of the walls to T
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