Maurice Tutor

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    Argosy University/ Phoniex University/
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Category > Management Posted 03 Feb 2018 My Price 5.00

thickness of insulation

What additional thickness of insulation will be necessary to reduce the boil-off rate of liquid nitrogen to one-half of the rate corresponding to Problem 17.27? All values and dimensions in Problem 17.27 apply.

Problem 17.27

Liquid nitrogen at 77 K is stored in an insulated spherical container that is vented to the atmosphere. The container is made of a thin-walled material with an outside diameter of 0.5 m; 25 mm of insulation (k = 0:002 W/mK) covers its outside surface. The latent heat of nitrogen is 200 kJ/kg; its density, in the liquid phase, is 804 kg/m3. For surroundings at 25°C and with a convective coefficient of 18 W/m2 K at the outside surface of the insulation, what will be the rate of liquid nitrogen boil-off?

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Maurice Tutor
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Status NEW Posted 03 Feb 2018 12:02 AM My Price 5.00

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