A cylindrical steel vessel 2.5 m outer diameter has hemispherical domed ends and is to be used in a refinery for a certain process the vessel will contain a solution at 250°C. The wall of the vessel is 12.5 mm thick and it is 10 m from top to bottom on the outside.
Estimate the rate of heat loss from the vessel when the outside air temperature is 10°C.
The thermal conductivity of the steel is 45 W/m K and the surface heat transfer coefficient on the air side is 8 W/m2. On the inside it is 65 W/m2.
The vessel is to be covered in lagging 25 mm thick with a thermal conductivity of 0.05 W/m K. The surface heat transfer coefficient remains the same.
Calculate the reduction in the rate of heat loss.
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