In an Air Cooled Condenser, exhaust steam flows from the steam turbine through large ducts to a steam distribution manifold. This manifold is on the top of the ACC plant feeding an array of fin tube heat exchangers.

Indirect dry cooling is also known as "Heller System"
Indirect dry cooling means, air is used as a secondary cooling medium.

Mechanical Draught Cooling Towers are characterized by a compact design and have been in use for about 60 years. While natural draught cooling towers are normally employed in power stations, fan-assisted cooling towers.

Natural draught wet cooling towers have been used for nearly 100 years mostly for water cooling in large power stations. The major economical advantage of natural draught cooling towers is the extremely low auxiliary power consumption.

The saturated air leaving conventional wet cooling towers is visible at certain climatic conditions. Depending on site conditions, this visible cooling tower plume has to be avoided.