Pipes with inner and outer diameters of 50 mm and 60 mm, respectively, are used for transp...

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