More often than not, when walking around power stations or industrial sites, you will realize some boxes with funs on top. Ideally, these are the cooling towers and are supposed to keep off the unwanted heat in the commercial building or cool the processes going on in there.

For this reason, in case you are in a situation where heat is a problem in your industrial, then cooling towers would be a great solution. Natural draft cooling towers are some of the coolers that you will come across.

However, these are more often than not located near load centers, that is away from the source point. This is especially because they work without the help of any rotating equipment, thus saving cost.

It is for this reason, then that it is advisable to opt for natural draft cooling towers to help keep your industry cool. Additionally, unlike other coolers and other industrial machines, it is environmental friendly and has no mechanical noises.

Below is more information about the natural draft cooling towers, their operations and why you should consider it to help solve heat problems in your industry.

What Is a Natural Draft Cooling Tower?

When running large industries, for instance, large power plants, heat is always one of the challenges that you need to get a solution to for your industry to run efficiently. This is especially due to the many processes involved and the use of power sources such as electricity among others.

In that case, it is paramount to look for cooling techniques such as cooling towers to help avoid any mechanical havocs brought about by excess heat. A natural draft cooling tower is one of the concrete decisions that you can make in these case, and eventually have a good solution.

A natural draft cooling tower can, therefore, be described as a heat rejection device that naturally rejects heat into the atmosphere by cooling a water stream to low temperatures. This cooling tower depends on natural convection of air flowing upwards, and comes in contact with the water thus cooling it.

As a result, natural draft cooling tower can be termed as economical since it does not use any source of energy such as electricity, wind, and water among others to help it operate but instead operates naturally. Additionally, it allows a high flow of water thus making it possible to cool high volumes of water within the shortest time possible.

Areas of Operation

More often than not, the natural draft cooling towers are used in large industries and power plants which have unlimited cooling water flow. This is mainly through evaporation of water to cool to remove excess heat.

Other areas of operations are circulating water used in oil refineries, thermal power stations among other chemical plants.

Working Principle of Natural Draft Cooling Towers

As stated above, natural draft cooling towers work by allowing cool air to come into contact with the heated water that needs cooling. In this working process, there are small volumes of water that evaporate, which helps in lowering the volume of water that is being circulated throughout the natural draft cooling tower.

It is, therefore, right to say that cooling towers work under the evaporative cooling principle. Water is distributed to the top of the cooling tower where distribution takes place.

Thereafter, cooling towel nozzles are used to distribute the water back to the wet deck. It is at this time that air is brought in through the air inlet which will also be found at the top of the natural draft cooling tower, thus forcing water to evaporate.

After evaporation has taken place, heat is then removed from the water and it is said to have cooled. The hot air then naturally rises out of the tire and out of the cooling tower, thus leaving behind cool water.

Operation of A Natural Draft Cooling Tower During Winter

In a natural draft cooling tower, the cooling airstream volume is not controllable unlike the case in a mechanical draft cooling tower. For this reason, during winter other control elements such as zone control can be deployed depending on the thermal load and outside temperature.

This is a case where all cooling zones and winter controls will be disconnected thus creating an air inlet hot water curtain bypass.

In the event there are isolated cool zones, all excess water will be diverted through the by-pass and directly into the cold water basin. In this process, however, no fittings are used, thus diversions occur hydraulically.

This ensure there are no problems in winter.

Applications of Natural Draft Cooling Tower

  • Heat industries
  • Oil plants
  • Steel factory
  • Chemical industries and foundry
  • Thermal power plants
  • Nuclear power plants
  • Chilling plants

Advantages and Disadvantages of a Natural Draft Cooling Tower


  • There are no corrosion problems
  • Power saving since there are no electrical fans installed
  • There is minimal or low maintained
  • There is a high stack outlet thus no recirculation of air occurs
  • Safety of operation
  • Limited plot area
  • The payback period is between 8 and 16


  • High investment cost
  • A huge flow of water required
  • Performance depends on wind velocity and direction
  • Potential optimization
  • There is a reduction in environmental impact
  • Offers total cooling efficiency
  • Operational and economic efficiency
  • No noise elimination
  • Used materials and components


As discussed above, investing in a natural draft cooling tower is one of the most profitable investments that you can make. Customers who have worked with us to get these cooling towers are satisfied with the quality and of the towers and feedback about them since they are manufactured with complete expertise.

Natural draft cooling towers are also designed based on specific customer needs and preferences. For this reason, we ensure that the cooling tower you have has the specifications that comply with required parameters.

Here is a sample of a few comments from the customers;

Customers inquired on how area and space the cooling towers are located can be reduced. In essence “how can the cooling towers be made to occupy less space to save on land resource?”

Customer also gave their concerns on “the consequences on health and nature the cooling towers have so that they could take necessary measures to mitigate them.”

Generally, customers were satisfied with the warranty given for the natural draft cooling towers.