Thermodynamics HW Solutions 51

Thermodynamics HW Solutions 51 - Chapter 1 Basics of Heat...

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Chapter 1 Basics of Heat Transfer 1-102 The convection heat transfer coefficient for heat transfer from an electrically heated wire to air is to be determined by measuring temperatures when steady operating conditions are reached and the electric power consumed. Assumptions 1 Steady operating conditions exist since the temperature readings do not change with time. 2 Radiation heat transfer is negligible. Analysis In steady operation, the rate of heat loss from the wire equals the rate of heat generation in the wire as a result of resistance heating. That is, && ( QE V I == = generated V)(3 A) = 330 W 110 D =0.2 cm 240 ° C L = 1.4 m The surface area of the wire is
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This note was uploaded on 01/14/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.

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