Question: steam at T - 320 C flows in a cast iron pipe (k = 80 W/m - C) whose inner and outer diameters are DI

steam at T - 320 C flows in a cast iron pipe (k = 80 W/m - C) whose inner and outer diameters are DI = 5 cm and D2 = 5.5 cm. respectively. The pipe is covered with 3-cm-thick glass wool insulation with k-0.05 W/m - "C. Heat is lost to the surroundings at 7=5CE natural convection and radiation, with a combined heat transfer coefficient of 12 - 18 W/m2 C. Taking the heat transfer coefficient inside the pipe to be hl = 60 W/m2 C, determine the rate of heat loss from the steam per unit length of the pipe. Insulation

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