Solution: Checking the water quality in recooling systems | ÖNORM B5020
Solution: Checking the water quality in recooling systems | ÖNORM B5020
Dipl.-Ing. Thomas Fleischanderl
Testing the microbiological water quality in recooling systems | ÖNORM B5020
Testing the microbiological water quality in recooling systems | ÖNORM B5020
In an evaporative recooling system, the cooling water is distributed via internal components, while air is simultaneously directed over the internal components with the aid of fans that are either suction or pressure-fed. Part of the cooling water evaporates, creating the cooling effect. The water cooled in this way is collected in a collection tank. The heat to be removed is released into the environment with the exhaust air.
With this exhaust air, part of the sprayed water is released to the outside as an aerosol and can be carried several hundred meters. This aerosol may contain Legionella or other microorganisms that are potential pathogens.
In addition to microbiological guidelines, ÖNORM B 5020 also describes the measures that must be taken if these guidelines are exceeded. Implementation of this standard offers operatorslegal certaintythat they are operatingarecooling system in accordance with the current state of the art.
Since then, the experts at TÜV AUSTRIA have been regularly inspecting recooling systems in accordance with ÖNORM B 5020 for the following parameters:
- Legionella (including determination of the serogroup)
- Pseudomonas aeroginosa
- Aerobic colony count at 37°C
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