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Drift eliminators
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Certification Manual
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Technical Certification Rules

SCOPE OF THE PROGRAMME

The Eurovent Certified Performance (ECP) programme scope for Drift Eliminators (DE) applies to products used for evaporative water-cooling
equipment. There are three types of drift configuration covered by this certification programme, including:

  • Counter-flow
  • Cross-flow integrated (film fill)
  • Cross-flow non-integrated (Splash fill).

Drift eliminators of different material family (such as PVC, PP, steel, FRP, etc) and design shall be considered as a new drift eliminator.

PRODUCT TYPE

Drift eliminators are a refrigeration system component designed to capture large water droplets in cooling towers. Cooling towers, also known as evaporative heat rejection equipment, are used in both buildings and processes, in a wide range of applications, from large residential to commercial and industrial.

Drift eliminators are designed to capture large water droplets caught in the cooling tower air stream. Drift eliminators prevent the water droplets and mist (called drift or windage) from escaping the cooling tower. Eliminators do this by causing the droplets to change direction and lose velocity as they impact on the eliminator walls. The impact condenses the droplets into water, which then falls back into the tower.

Drift eliminators typically come in either blade or cellular design and can be framed or unframed. There are three main types of drift eliminator used in a cooling tower. All have the same design purpose and include:

  • Counter-Flow
  • Cross-Flow Integrated
  • Cross-Flow non-integrated.

These drift configurations may be made from a number of materials including polypropylene (PP), polyvinyl chloride (PVC) or galvanised / stainless steel.

DEFINITIONS

While exploring our certified products you’ll come across a number of technical terms relating to certification. The below definitions help explain the search criteria in our certified product directory.

Certified product types in the DE programme have the following search criteria in common:
 

Brand
Brand name of the manufacturer.

Range 
Listing of models with some common features.

Model
Model name.

Breakthrough velocity
Breakthrough air velocity can be observed in three stages:
1st:  Small droplets leave the DE then fall back down almost immediately
2nd: Small droplets float above the DE without leaving
3rd: Droplets are carried away by the airflow and leave the DE.

The breakthrough velocity corresponds to the beginning of the third stage.  It is the air velocity for which drift losses become visible. Expressed in m/s.

Drift rate
Is the proportion of the drift volumetric flow rate, to the circulating water flow rate, entrained in the airflow and exiting at the discharge of the eliminator. Expressed as a percentage.


Search for certified products in our Drift Eliminator programme via our certified product directory.

CERTIFIED CHARACTERISTICS

The following performance items are certified:

  • This certification provides 2 certified drift threshold options depending on the tested values; drift rate less than or equal to 0.002%, or drift rate above 0.002%, but below or equal to 0.01%, above 0.01% tested drift rate no certification will be given according to the relevant Eurovent Rating Standard.
  • For counter-flow and cross-flow film fill, the average drift losses of the two tests at 3.5 m.s-1 are less than 0.002% or less than or equal to 0.01% of circulating water flow rate.
  • For cross-flow splash fill, the average drift losses of the two tests at 3 m.s-1 are less than 0.002% or less than or equal to 0.01% of circulating water flow rate.
  • The value over time of this certification is subject to proper installation and maintenance of the drift eliminator and to the respect of adequate manufacturer's recommendations.
  • Breakthrough velocity is given for information only.

Search for certified products in our Drift Eliminator programme via our certified product directory.

Find out how to apply for the Drift Eliminator programme.

💡 For information

When using the Advanced Search Criteria function you can search via breakthrough velocity and drift rate.

 

Search for certified products in our Drift Eliminator programme

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