A three way valve is provided in the cooling water line
to enable bypassing of the cooler. The cooler is provided with a full flow of
sea water which is not controlled by the system. A temperature sensing element
on the water outlet provides a signal to a two term controller (P+I). The
controller is provided with a desired value and any deviation between it and
the signal will result in an output to the three way control valve.
If the measured
temperature is low, more water will be bypassed and its temperature will
therefore increase.
If the measured
temperature is high, then less water
will be bypassed, more will be cooled and the temperature will fall.
A simple system
such as this can be used only after careful analysis of the plant conditions
and the correct sizing of equipment fitted.
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