Over the last years the industrial and civil plants realization put a growing emphasis on the evaluation and restraint of the acoustic impact. In the specific case of cooling towers, this problem has an outmost importance; for this reason SCAM T.P.E. S.r.l. developed inside its organization the ability to predict and control the acoustic emissions. The experience achieved in this field led SCAM T.P.E. S.r.l. to apply an advanced calculation program for the acoustic impact of its cooling towers through the collaboration of companies specialized in the realization of solutions for the acoustic restraint.
The cooling tower is an equipment made up of an ensemble of sound sources characterized by different spectral trends set on different positions. In its acoustic analyzes SCAM T.P.E. S.r.l. considers three main sound sources: impeller rotation in the fan group, the reverberation in the tower body on the same frequencies emitted by the group and the impact produced by the water on the free surface of the same.
For the calculation of the result of the PWL sound power level generated (ISO 3746-3744) it is considered the sum of the volume and the tower sources; granting in this way the sound pressure medium level (intended as the logarithmic sum of the levels in n. measuring positions on various heights) equal to the sound pressure value indicated at the desired distance by the envelope of the whole reference source, then along the perimeter and in coverage (outside flow) in free field.
The acoustic impact of all cooling towers can be reduced by adequate silencing options, by considering that the low-medium frequencies (higher for the fan group) go through long distances bypassing the obstacles, while the medium-high frequencies (engraving for the sound of the water) are reduced by distance and by possible barriers. Basing on specific acoustic requirements, SCAM T.P.E. S.r.l. is able to support customer in the technical-economic optimization of the more suitable solution based on the reception real point and on the requested values, by referring to standards and regulations in use.
SCAM T.P.E. S.r.l. package towers are realized by a direct mechanical coupling between engine and fan with the resulting advantage of reducing noise due to transmission organs lack, and the installation of the engine inside the diffuser (apart from the indirect transmission towers type TTP/TTS).
The noise reduction process can be effected in gradual stages of growing soundproofing impact:
In order to optimize these solutions SCAM T.P.E. S.r.l. provided to prepare some soundproofing packages to be implemented on every version of tower as described here below:
For further clarifications about this, please contact SCAM T.P.E. S.r.l. offices.
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- Soundproofing systems for cooling towers