Contrast

At the coolingwateroutlet of unit EC 3-7.
At the right: coolingwater, coming out of the units at a temperature of 12°C (53.6°F), at the left a bit colder...
The birds like it.
We circulate a part of the coolingwater, that is: we closed the outletvalves of unit 3 and 6 and bring the water back to the inlet by means of a circulating duct.
So we bring up the inlet-temperature of the water just before the condensers to 3.7°C , which is just enough.
Otherwise we would have a big problem keeping the filters open.

Here in LARGE...

Here is a look at unit EC 20, seen from the outlet.