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A keel cooler is a type of internal combustion engine cooling system used in marine engines.. In this system, engine coolant is circulated through a system of tubing outside the vessel's hull, using the lower temperature of seawater to reduce the coolant temperature via heat exchange before it is recirculated through the engine. [1]
Cooling system regulation includes adjustable baffles in the air flow (sometimes called 'shutters' and commonly run by a pneumatic 'shutterstat'); a fan which operates either independently of the engine, such as an electric fan, or which has an adjustable clutch; and a thermostatic valve or a thermostat that can block the coolant flow when too ...
Heat exchangers on board vessels are used throughout many system. Systems that use heat exchangers include lube oil, jacket water, steam systems and main seawater. The systems are often interconnected by heat exchangers in order to remove heat generated from running equipment from the engine room.
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Proper engine coolant and a pressurized coolant system obviate these shortcomings of water. With proper antifreeze, a wide temperature range can be tolerated by the engine coolant, such as −34 °F (−37 °C) to +265 °F (129 °C) for 50% (by volume) propylene glycol diluted with distilled water and a 15 psi pressurized coolant system.
English: A schematic of a fully closed internal combustion engine cooling system for ships. 1. Cooling pipes; filled with chemical cooling substance; fully closed; cooled itself by seawater. 2. Pump; 3. IC engine; 4. Outlet pipe for exhaust fumes; 5. Clutch
Thermosyphon cooling system of 1937, without circulating pump . Radiators first used downward vertical flow, driven solely by a thermosyphon effect. Coolant is heated in the engine, becomes less dense, and so rises. As the radiator cools the fluid, the coolant becomes denser and falls.
English: A schematic of an open internal combustion engine cooling system for ships. 1. Valve; 2. Filter; 3. Pump; 4. IC engine; 5. Clutch; 6. Outlet pipe (works as water seal) Note: As visible in the drawing, coolant water and exhaust fumes are mixed.
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