Pipes with inner and outer diameters of 50 mm and 60 mm, respectively, are used for transporting superheated va- por in a manufacturing plant. The pipes with thermal conductivity of 16 W/m·K are connected together by flanges with combined thickness of 20 mm and outer diameter of 90 mm. Air condition surrounding the pipes has a temperature of 25°C and a convection heat transfer coefficient of 10 W/m2·K. If the inner surface temperature of the pipe is maintained at a constant temperature of 150°C, determine the temperature at the base of the flange and the rate of heat loss through the flange. Answers: 148°C! 18W
FIGURE P3-121
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