The cooling water is circulated through the boxcooler tube bundle, which is suspended in the sea chest. Heat is transferred from the boxcooler tubes to the seawater, causing it to rise due to its lower density, creating a natural upward circulation. Openings in the bottom and upper side of the sea chest help to direct and focus the natural convection flow of seawater through the sea chest and across the boxcooler tubes. Additional cooling efficiency can be realized through forced circulation induced by the motion of the vessel.
Advantages
Closed circuit cooling system
Seawater does not enter the hull
Low maintenance solution
Eliminates inboard heat exchanger, raw water pumps, seacock, seawater piping, and strainers
Zero discharge solution: Eliminates potential contaminants entering seawater
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