Estimating Evaporation Losses from Liquified Gases

ESTIMATING EVAPORATION LOSSES FROM LIQUIFIED GASES 

Liquified gases are sometimes stored in well-insulated spherical containers that are vented to the atmosphere. Examples in the industry are the storage of liquid oxygen and liquid ammonia in spheres. If the radii of the inner and outer walls are r0 and r, and the temperatures at these sections are T0 and T, an expression for the steady-state heat loss from the walls of the container may be obtained. A key assumption is that the thermal conductivity of the insulation varies linearly with the temperature according to the relation  

The expression for the steady-state heat loss through the walls of the vessel is  

The inputs required for the calculation are the radii, inner and outer temperatures, and thermal conductivities at the two temperatures. This expression enables an estimate of the heat flow into a spherical storage tank containing liquified gas. 

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ESTIMATING EVAPORATION LOSSES FROM LIQUIFIED GASES... 

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