Cooling Tower is a common device to lower temperature through evaporation. Most large buildings in Hong Kong have central air conditioning system and utilize cooling towers to release the waste heat from the refrigeration units. The water circulated in the cooling tower contains many microorganisms due to the warm environment and cause pipe line scaling, growth of bio-film as well as Legionella Disease ( LD in short ).
Scaling in pipe line and the forming of bio-film inside the cooling tower packing will definitely lower the thermal transfer efficiency. It is the responsibility of the cooling tower owner to ensure no dangerous LD outbreak to the atmosphere.