Cooling Tower: Types, Work Process and Industrial Application

Industrial processes and machines generate such large amounts of heat that continuous dissipation is necessary for efficient operation. The heat must be to the environment. This is through a heat exchange process. That is the basis of the cooling tower technology.

It is interesting that despite cooling towers being devices of the 20th century, knowledge about them is actually limited. Some people even believe cooling towers are sources of pollution, yet the only thing they release to the atmosphere is water vapor.

Types of Cooling Towers

After many years of development of this technology, cooling towers are available in different types and sizes. Each of these is applicable in a certain load configuration, the reason it is important to outline the options available. Note that despite the different designs, the basic function remains as that of dissipating heat from a building system or a process to the air through evaporation. Here are some categorizations.

  1. Mechanical draft cooling tower
  2. Atmospheric cooling tower
  3. Hybrid draft cooling tower
  4. Air flow-characterised cooling tower
  5. Construction-characterised cooling tower
  6. Shape characterized cooling tower
  7. Cooling tower based on method of heat transfer

Each of these could carry several cooling towers. For instance, categorizing cooling towers in terms of heat transfer method gives three options: Dry cooling towers, Open circuit cooling towers and Closed circuit cooling towers/ fluid cooling towers.

District Energy reference book

 

How a Cooling Tower Works

Warm water from industrial equipment, commercial ac system or any other heat source enters the tower and spreads evenly at the top. As the water flows down the tower, the equipment fill spreads it over a large area to increase the water-air contact, thus enhancing heat transfer via evaporation.

A large volume of air is constantly moving along the fill courtesy of large fans in the tower. As evaporation takes place, the water loses heat. It eventually enters the tower sump at the bottom. The cool water then goes back to cool the initial heat source and the cycle repeats. For the sake of system dilution, of portion of the system water goes to the drain through a bleed-off valve. The makeup line feeds the cooling tower with fresh water for replenishment.

You will not note these processes easily because their simultaneous occurrence creates a continuous loop. The figure below shows the process in a typical cooling tower.

cooling-tower-process

Fig 1: Cooling Tower Process

Efficient Operation of the Cooling Tower

Cooling towers may be generally cost-effective for industrial cooling compared to other options, but efficiency challenge can be a letdown. Monitoring the efficiency factor is crucial as it ensures the following:

  • Reduced water consumption
  • Energy savings
  • Extended equipment service life
  • Reduced operating costs

To keep the cooling tower running efficiently, three things are important: understand the type of cooling tower you are using, use chemicals efficiently and track down system water loss.

The Industrial Application of Cooling Towers

The cooling tower system is common in many industries, chief among them being power, commercial, HVAC and industrial. In the industrial setup, the system rejects heat from machinery, heated process material among other sources. Specifically, industrial cooling towers are common in food processing plants, petroleum refineries, natural gas plants and petrochemical plants.

cooling-tower-araner

Other industrial applications:

  • Water cooled air compressors
  • Plastic Injection & Blow Moulding Machine
  • Die casting machine
  • Refrigeration and chilling plant
  • Cold storage
  • Anodizing processes plant
  • Electrical power generation plant
  • Water cooled air conditioning systems and VAM machines

The Question of Air-Cooled Chillers vs. Water-Cooled Chillers

Whenever you mention cooling towers in the context of ARANER cooling solutions, the comparison of these two systems comes up. Each has its pros and cons, but in dry areas often, air cooled chillers are more preferable. Also when the reliability of the plant is very important and the dependency on water supply must be avoided. This is usually the case for mission critical facilities such as data centers.

One of the main differences between the two systems is the absence of a cooling tower in an air-cooled chiller system, bringing benefits such as less maintenance and service requirement.

air-cooled-system-water-cooled-system

Fig 2: Air-Cooled System vs. Water-Cooled System

Cooling tower technology is vital in numerous refrigeration systems where they provide process cooling and comfort. However, you may be forced to choose a different cooling solution if upfront cost, space, noise, energy bills and water availability bother you. At ARANER, we appreciate the suitability of cooling towers in certain cases, but we value air-cooled solutions for their ease of operation, ease of setup among other benefits. If you are unsure whether you need a cooling tower installation, contact us for more guidance.

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