Chapter 15 Steady Heat Conduction3-78E 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. Assumptions1Heat 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. PropertiesThe 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 ADLLiioo====ππ(. /(.(./(.0 4 1210105
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