Steam at 320°c flows in a stainless steel pipe (k =15 w/m ·°c) whose inner and outer diameters
are 5 cm and 5.5 cm, respectively. the pipe is covered with 3-cm-thick glass wool insulation
(k = 0.038 w/m ·°c). heat is lost to the surroundings at 5°c by natural convection and radiation,
with a combined natural convection and radiation heat transfer coefficient of 15 w/m2
·°c. taking
the heat transfer coefficient inside the pipe to be 80 w/m2
·°c, determine the rate of heat loss from
the steam per unit length of the pipe. also determine the temperature drops across the pipe shell
and the insulation