Chapter 3 Steady Heat ConductionReview Problems 3-152ESteam is produced in copper tubes by heat transferred from another fluid condensing outside the tubes at a high temperature. The rate of heat transfer per foot length of the tube when a 0.01 in thick layer of limestone is formed on the inner surface of the tube 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 centerline 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 conductivities are given to be k= 223 Btu/h⋅ft⋅°F for copper tubes and k= 1.7 Btu/h⋅ft⋅°F for limestone. Analysis The total thermal resistance of the new heat exchanger is &&().QTTRRQnew
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