Types of Cooling Water Systems

The machinery systems fitted onboard ships are designed to work with maximum efficiency and run for long hours. The most common and maximum energy loss from machinery is in the form of heat energy. This loss of heat energy has to be reduced or carried away by a cooling media, such as a central cooling water system, to avoid malfunctioning or breakdown of the machinery.


There are two cooling systems used onboard for the cooling purpose:

  1. Sea Water cooling system: Seawater is directly used in the machinery systems as a cooling media for heat exchangers.
  1. Freshwater or central cooling system: Freshwater is used in a closed circuit to cool down the engine room machinery. The freshwater returning from the heat exchanger after cooling the machinery is further cooled by seawater in a sea-water cooler.

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