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Evaporative Condensers

1.1    Scope

Evaporative condensers allow refrigeration systems to operate with lower head pressures and higher efficiencies than can be achieved using air-cooled condensers or water-cooled condensers. They use evaporative cooling to remove heat from the refrigerant vapour.

Evaporative condensers are generally used in larger refrigeration systems and the Energy Technology List (ETL) Scheme aims to encourage their purchase as an alternative to lower efficiency solutions.

To be eligible for inclusion on the ETL, products shall meet the requirements as set out below.

1.2    Definitions

Evaporative Condensers are specifically designed to cool and condense high-pressure refrigerant vapour by means of a heat exchanger that has a wetted external surface across which air is blown by a fan. 

1.3    Requirements 

1.3.1    Eligibility requirements  

To be eligible, products shall:

  • Incorporate:

a)    A heat exchanger that is designed to cool and condense refrigerant vapour.

b)    An axial fan that blows air over the heat exchanger.

c)    A blow down facility for the water storage tank to enable total dissolved solids content of the water in the storage tank to be controlled.

d)    And either: 
–    A mechanism that wets the external surface of the heat exchanger that includes a water pump and a water storage tank; or
–    A hybrid mechanism that wets the external surface of the heat exchanger at high ambient temperatures (evaporative cooling) and switches to dry operation when a user defined dry switch-point is reached at lower temperatures (dry cooling). The hybrid mechanism will also include includes a water pump and a water storage tank.

  • Conform with the requirements of The Pressure Equipment (Safety) Regulations 2016 in respect of its design, manufacture and testing procedures, or have an appropriate Conformity Assessment mark.
  • In addition, where products incorporate an automatic blow down control system, they shall also incorporate a means of measuring total dissolved solids content of the water in the storage tank. 

1.4    Verification for ETL Listing 

There are no testing requirements, however manufacturers shall provide sales and technical brochures to evidence the conformity of their products against the requirements from section 1.3.  

1.5    Conformity testing

Products listed on the ETL may be subject to the scheme’s conformity testing programme in order to ensure listed models continue to meet the ETL requirements.