Cooling tower silencers
Cooling towers are divided into wet cooling towers, dry cooling towers and fresh water cooling systems, as well as combinations of these systems. A distinction is made between natural draught and forced ventilation cooling towers.
In natural draft wet cooling towers, the noise is mainly generated in the drip area of the cooling water on the water surface of the collection basin.
The frequencies that determine the sound level are generally above 500 Hz, and the total sound level is more than 80 dB(A), measured at the intake opening.
Fan-driven wet cooling towers generate a broadband sound spectrum with sound level-determining frequencies of fan noise from 30 Hz to 500 Hz and water noise from approx. 500 to 4,000 Hz. The total sound pressure levels in the intake opening are higher than those of comparable natural draft cooling towers.
Sound insulation measures for cooling towers are divided into sound insulation walls with achievable noise reductions of up to approx. 12 dB and baffle silencers with insertion loss values of up to approx. 30 dB, depending on the intensity and spectrum of the sound source and the distance to residential areas. BBM Akustik baffle silencers are usually made of seawater-resistant aluminium and are available in lengths of up to 15 m.
Due to the large silencer volume required and the associated costs, the silencers must be optimised in accordance with the specified noise spectrum and minimised in terms of flow pressure losses and costs.
Several test benches and state-of-the-art measuring and analysis equipment, including the necessary IT equipment, are available for acoustic and fluid dynamics design.
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