How Does an Air Cooled Condenser Work? In thermal power plants, exhaust steam from the steam turbine flows into the air cooled condenser (ACC) where the condensation occurs. Then the condensate water returns to the boiler in a closed loop. Meanwhile, the exhaust steam coming from the turbine is at a low pressure, the Air Cooled Condenser works at pressure as a vacuum to avoid the pressure drop increase and impact the efficiency of power generation, and then the non-condensable gases will be remo