Chapter 15 Steady Heat Conduction3-68A steam pipe covered with 3-cm thick glass wool insulation is subjected to convection on its surfaces. The rate of heat transfer per unit length and the temperature drops across the pipe and the insulation are 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 conductivities are constant. 4 The thermal contact resistance at the interface is negligible. PropertiesThe thermal conductivities are given to be k= 15 W/m⋅°C for steel and k= 0.038 W/m⋅°C for glass wool insulation AnalysisThe inner and the outer surface areas of the insulated pipe per unit length are ADLLiioo===+=ππ(.(..(.005101570 055 0 0610 361m) m)mm22RiT∞1R2RoT∞2R1The individual thermal resistances are
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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.