In a pharmaceutical plant, a copper pipe (k c 400 W m middot K) with inner diameter of 20 mm and wall thickness of 2 5 mm is used for carrying liquid oxygen to a storage tank The liquid oxygen flowing in the pipe has an average temperature of 200 deg C and a convection heat transfer coefficient of 120 W m 2 middot K The condition surrounding the pipe has an ambient air temperature of 20 deg C and a combined heat transfer coefficient of 20 W m 2 middot K If the dew point is 10 deg C, determine the thickness of the insulation (k i 0 05 W m middot K) around the copper pipe to avoid condensation on the outer surface Assume thermal contact resistance is negligible Liq O2 200c h 120 W m K Pipe, k 400 W m K Insulation k, 0 05 W m K Surrounding air, 20C hcombined 20 W m2K Dew point 10C DI 20 mm D2 25 mm D3

Question: In a pharmaceutical plant, a copper pipe (k c = 400 W/m·K) with inner diameter of 20 mm and wall thickness of 2.5 mm is

In a pharmaceutical plant, a copper pipe (k_c= 400 W/m·K) with inner diameter of 20 mm and wall thickness of 2.5 mm is used for carrying liquid oxygen to a storage tank. The liquid oxygen flowing in the pipe has an average temperature of -200°C and a convection heat transfer coefficient of 120 W/m²·K. The condition surrounding the pipe has an ambient air temperature of 20°C and a combined heat transfer coefficient of 20 W/m²·K. If the dew point is 10°C, determine the thickness of the insulation (k_i= 0.05 W/m·K) around the copper pipe to avoid condensation on the outer surface. Assume thermal contact resistance is negligible.

Liq. O2. -200°c h= 120 W/m?-K

Liq. O2. -200c h= 120 W/m?-K" -Pipe, k= 400 W/m-K Insulation k, = 0.05 W/m-K Surrounding air, 20C hcombined = 20 W/m2K Dew point = 10C DI = 20 mm D2 = 25 mm D3

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