I’im building the interface systems for my triple expansion engine which includes a stand alone cooling water tank/tower for the condenser. The condenser is a two compartment water tube unit meaning the water flows from a pump from the entry end then flows back through the second tube bank before returning to the tank. The steam enters the top of the condenser body and condensate is pumped out of the bottom. Question is: which way does the cooling water flow? Should it enter the top, hot section and flow Down or should it get pumped into the bottom and flow up?