Question

Steam at 320°C flows in a stainless steel pipe (k 5 15 W/m·K) 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 5 0.038 W/m·K). 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 ·K. Taking the heat transfer coefficient inside the pipe to be 80 W/m2 ·K, 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.

Answer 1

1. determine the rate of heat loss from the steam per unit length of the pipe. = 93.94w
2. Also determine the temperature drops across the pipe shell and the insulation = 290.18°C

Step-by-step explanation:

1. determine the rate of heat loss from the steam per unit length of the pipe. = 93.94w
2. Also determine the temperature drops across the pipe shell and the insulation = 290.18°C

check the attached doc for proper explannation