How to reduce the noise level in the cooling tower?

 How to reduce the noise level in the cooling tower?

When desining a  cooling tower, the requested noise level is also an important factor which each technical engineer need to take into consideration. Some endusers need the cooling tower to be operated with lower noise level. So how to reduce the noise is very important for each cooling tower manufacturers.

1. General

The noise level, Sound Power Level (SWL) and Sound Pressure Level (SPL), is an important
environmental parameter which will affect the design parameters for designing the cooling tower and its appropriateness to the environment and the client’s requirements. While SPL is relatively easy to measure directly by using sound level meters, SWL is not measurable, as it is a theoretical value.

In general, the main noise locations in cooling tower are-

• Air inlet point – or the area in proximity to the louvers where the main source of noise is falling water
• Air outlet point - or the area of the fan housing where the main sources of noise is the fan movement and motor operation.

2. Calculating the noise level

There are many standards for conditions and processes for determining the SWL of a cooling tower. What they all have in common is that the SWL is calculated indirectly from the SPL measured at points and surfaces surrounding the tower. The main difference between all the standards lies in the points and
surfaces at which the SPL must be measured in order to calculate the SWL. Other differences between
standards: Some are based on near-field measurements, and others on far-field measurements; while
others include both; some are intended for small towers, and others for large towers.

The measuring surfaces defined in the standards define enveloping surfaces (entire or partial) that enclose both noise sources in the tower. For example, DIN 45635, a common standard, sets the SPL measuring surfaces and points thusly:

In order to solve this problems, Latino's engineers worked together to develop a new cooling tower spare, which is the cooling tower noise attenuation. This noise attenuation could reduce the noise generate by the impact of the rain droplets on the water basin. They are located in the basin just above the water level. The rain minimizes the noise. The water is then slowly drained down to the basin. The typical attenuation of the rain water noise amounts to 50 to 8 dB(A), deppending of the spcific water flow. Addtional attenuation may be obtained by adding a plastic tissue on the laths.

Here please find some reference pictures for your check!

For more detailed technical data, please kindly contact us directly. And if you have any other interesting cooling tower components, such as cooling tower fill, cooling tower drift eliminator, cooling tower nozzle, ect., please kindly contact us.

Tianjin Latino Environmental Technology CO.,Ltd.