Dry type natural draft cooling towers are very large constructions. The advantage is that due to their high chimneys, they can produce very high air flow rates without the need for any fan application.
Disadvantages are very high investment costs. This dry type natural draft cooling towers, which are widely used in large Petro chemical plants as well as nuclear power plants, do not suffer from water loss.
As the closed type towers, the operating waters are cooled with the help of the air which is accelerated by the big chimney force while passing through the big pipe coils or radiators.
This, dry type natural draft cooling towers, which are also widely used in Bulgaria, provide significant efficiency. Bulgaria wet bulb temperature between 19-26 degrees for dry type natural draft cooling towers
Cooling tower is a device in which comes hot water into direct contact with the ambient atmosphere . Cooling water is sprayed on top of the cooling tower and then flows down through the cooling fills into collecting basin. Air, which is sucked from holes in the bottom of the tower , flows a gainst raining water , and cools the hot water. The main source of heat dissipation is evaporation of circulating water. Cooling water is subsequently pumped from the pool by pumps back to the cooled machinery.