Thermodynamics HW Solutions 822

Thermodynamics HW Solutions 822 - 2 m 003142 . m) m)(0.50...

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Chapter 10 Boiling and Condensation 10-33 Boiling experiments are conducted by heating water at 1 atm pressure with an electric resistance wire, and measuring the power consumed by the wire as well as temperatures. The boiling heat transfer coefficient is to be determined. Assumptions 1 Steady operating conditions exist. 2 Heat losses from the water are negligible. T s =130 ° C Heating wire, 3.8 kW 1 atm Analysis The heat transfer area of the heater wire is
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Unformatted text preview: 2 m 003142 . m) m)(0.50 002 . ( = = = DL A s Noting that 3800 W of electric power is consumed when the heater surface temperature is 130 C, the boiling heat transfer coefficient is determined from Newtons law of cooling to be C W/m 40,320 2 = = = = C ) 100 )(130 m (0.003142 W 3800 ) ( ) ( 2 sat sat T T A Q h T T hA Q s s s s & & 10-34...
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