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Counter-Flow Type Cooling Towers

Product Name: Counter-Flow Type

Counter-Flow Type Cooling Tower

A cooling tower is a heat rejection device that rejects waste heat to the atmosphere through the cooling of a water stream to a lower temperature. They can be classified by the application, in Industrial cooling towers and HVAC cooling towers. We offer products for the second group, where an HVAC (heating, ventilating, and air conditioning) cooling tower is used to dispose of ("reject") unwanted heat from a chiller. Within this group, the cooling tower can be also classified by their construction: package type and field erection type.

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Categorization by air-to-water flowCounter Flow Type Cooling Towers

  Counterflow diagram.svg   

In a counterflow design, the air flow is directly opposite to the water flow (see diagram at left). Air flow first enters an open area beneath the fill media, and is then drawn up vertically. The water is sprayed through pressurized nozzles near the top of the tower, and then flows downward through the fill, opposite to the air flow.

  • Advantages of the counterflow design:
    • Spray water distribution makes the tower more freeze-resistant.
    • Breakup of water in spray makes heat transfer more efficient.
  • Disadvantages of the counterflow design:
    • Typically higher initial and long-term cost, primarily due to pump requirements.
    • Difficult to use variable water flow, as spray characteristics may be negatively affected.
    • Typically noisier, due to the greater water fall height from the bottom of the fill into the cold water basin

Common aspects of both designs:

  • The interactions of the air and water flow allow a partial equalization of temperature, and evaporation of water.
  • The air, now saturated with water vapor, is discharged from the top of the cooling tower.
  • A "collection basin" or "cold water basin" is used to collect and contain the cooled water after its interaction with the air flow.

Both crossflow and counterflow designs can be used in natural draft and in mechanical draft cooling towers.

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