Thermodynamics HW Solutions 213

Thermodynamics HW Solutions 213 - Chapter 15 Steady Heat...

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Chapter 15 Steady Heat Conduction 3-78E Steam exiting the turbine of a steam power plant at 100 ° F is to be condensed in a large condenser by cooling water flowing through copper tubes. For specified heat transfer coefficients, the length of the tube required to condense steam at a rate of 400 lbm/h is to be determined. Assumptions 1 Heat transfer is steady since there is no indication of any change with time. 2 Heat transfer is one-dimensional since there is thermal symmetry about the center line and no variation in the axial direction. 3 Thermal properties are constant. 4 Heat transfer coefficients are constant and uniform over the surfaces. Properties The thermal conductivity of copper tube is given to be k = 223 Btu/h ft °F. The heat of vaporization of water at 100 ° F is given to be 1037 Btu/lbm. Analysis The individual resistances are AD L L ii oo == = = ππ (. / ( . (./ ( . 0 4 12 1 0105
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