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For heating and evaporation of the sea water in the freshwater generator, the waste heat in the jacket cooling water of the Diesel engine is used. The heat exchanger in the freshwater generator is connected to the jacket cooling water system of the Diesel engine, and is thus working as an extra cooler.
The jacket cooling water, which may reach a temperature between 60 and 90 °C, is passed outside the tubes of the heat exchanger. During this passage the temperature will drop between 5 and 12 °C depending on the amount of jacket cooling water used.
The controlled amount of sea feed water is led to the interior of the heat exchanger tubes, where it is heated under vacuum and evaporated by rising film exaporation, meaning that optimum conditions are achieved and scale formation minimized.
The vacuum required is obtained by means of a water ejector which automatically ensures correct conditions. The generated vapours pass through the separator, in which the seawater drops are separated to the brine and discharged by means of a brine pump.
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