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Question: exposure to high concentration of gaseous ammonia can cause lung...

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Exposure to high concentration of gaseous ammonia can cause lung damage. To prevent gaseous ammonia from leaking out, ammonia is transported in its liquid state through a pipe (k-25 W/m-K. Di = 0.034 m, Do-0.04 m, and L = 10 m). Since liquid ammonia has a normal boiling point of-333°C, the pipe needs to be properly insulated to prevent the surrounding heat from causing the ammonia to boil. The pipe is situated in a laboratory, where the average ambient air temperature is 20°C. The convection heat transfer coefficients of the liquid ammonia and the ambient air are 100 W/m2-K and 20 W/m2-K, respectively. Determine the insulation thickness for the pipe using a material with k = 0.75 W/mK to keep the liquid ammonia flowing at an average temperature of-35°C, while maintaining the insulated pipe outer surface temperature at 10°C The insulation thickness for the pipe iscm

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