Abstract
In a cryogenic storage system, all the A heat inflows through the insulation, are into the stored liquid. The B heat inflows are absorbed by the “cold” in the boil-off vapour.
They include heat transfer by radiation, conduction and convection from the ambient temperature environment of the storage system.
The total A heat inflows are normally balanced by the latent heat of surface evaporation of the boil-off vapour the Boil-off Rate or BOR. There is no boiling as such in a cryogenic storage system.
If some of the heat is stored by heating the liquid, the BOR will be reduced. This stored heat or ‘thermal overfill’, can with time lead to unstable rises in BOR to release the stored heat.
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References
Beduz, C., Rebiai, R., Scurlock, R.G.: Thermal overfill and the surface evaporation of cryogenic liquids under storage. Adv. Cryog. Eng. 29, 795 (1983)
Scurlock, R.G.: Heat flows into a cryogenic liquid storage system. In: Scurlock, R.G. Low Loss Storage and Handling of Cryogenic Liquids. Kryos, Southampton (2006). Chapter 3
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Scurlock, R.G. (2016). Heat Flows in LNG and LPG Cryogenic Storage Systems at 1 Bar. In: Stratification, Rollover and Handling of LNG, LPG and Other Cryogenic Liquid Mixtures. SpringerBriefs in Energy. Springer, Cham. https://doi.org/10.1007/978-3-319-20696-7_2
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DOI: https://doi.org/10.1007/978-3-319-20696-7_2
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