HW_5_Solution

HW_5_Solution - b. Because the heating element is outside...

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Solution of Homework Assignment 5 1.
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2.
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3. 4. Heat transfer is driven by temperature difference. For the cupped hands, the skater’s exhalation is warmer than the hands and thus the heat transfer is TO the hands; warming them. For the soup, the skater’s exhalation is cooler than the hands and thus the heat transfer is FROM the soup; cooling it. 5. Identify the energy transfer mechanisms.
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a. Because the heating element is inside the system, the heating element performs work transfer. Because the oven is well insulated, there is no heat transfer.
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Unformatted text preview: b. Because the heating element is outside the system, the heating element performs heat transfer. There is no work transfer. c. The current flow through the operating microchip performs electrical work. The cooling fan performs heat transfer. d. The sunshine into the dorm room is an example of radiative heat transfer. The oscillating fan performs work transfer. Note that the oscillating fan is outside the system. e. The stopped, insulated flask is an isolated system and thus there is neither work transfer, nor heat transfer....
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This note was uploaded on 09/05/2010 for the course MEEN 315 taught by Professor Ramussen during the Summer '07 term at Texas A&M.

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HW_5_Solution - b. Because the heating element is outside...

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