air handling unit on the rooftop

Engineering- and consultancy group Volantis has a clear focus on innovation, durability, safety, comfort and life-time performance. Our engineers and consultants think and work out-of-box, authentically and with an entrepreneurial spirit. When we have a project at hand, we take a look at the situation from different perspectives. Consequently, we get insight in how to execute the project and solve the problem.

 

We’ve asked Sorama to support us with a severe sound problem at an air handling unit on the rooftop of a nursing home. The people that live in the neighbourhood could not sleep well due to the noise of this air handling unit.
Volantis and Sorama executed multiple measurements with the Sorama CAM1K acoustic camera and the Sorama Portal. Because of the possibility to easily visualize noise at different individual frequencies, it was clearly shown that the main noise source was the return fan and the sound transfer path was the supply channel.  

This was a quite surprising and counterintuitive result, but the sound images were crystal clear. After some modifications of the return fan and the suspension construction of the supply channel, the noise problem was solved and the neighbourhood could sleep well again.

 
 

Low frequent noise problem in an apartment

 

By using the Sound Imaging technique, the source of a low frequent noise was found in a renovated apartment complex. The inner walls were scanned and the results showed that vibrations in the inner walls were responsible for the high amounts of sound pressure in between 20-40 Hz. The ventilation system excited the walls because of a little unbalance in the fan wheel. By decoupling the ventilation system from the inner walls, a improvement of 25-30 dB(A) was realized.

Low noise problem in an apartment visualized by Sorama
 
 
 

SIT & Sorama develop a silent boiler

 
 
SIT boiler analyzed by Sorama

In 2011 the Italian company SIT and Sorama joined their forces to develop solutions for a new silent boiler in which SunFlower, a new innovative SIT Integrated Combustion System, is applied.

Sound analysis of a boiler

By analyzing this compact boiler with the Sorama Sound Imaging technique, a quick learning curve provided worthy information regarding possible noise reduction measures. These new insights on the dynamic behavior of the boiler system helped to reduce the overall appliance noise of about 5 dB(A).

 
 
 
Within one day, Sorama provided the best practical noise reduction measures for the BUVA ventilation unit. This is done by measuring 3 different types of noise reduction, using the Sorama Cam64. More info: https://www.sorama.eu/
Investigation with Sorama Sound CAM reduced noise level of the NOVY Exhaust Hood substantially. Three different sides of the exhaust hood were measured in an anechoic chamber using the Sorama Scan-A. The trial solution resulted in an average decrease of 8 dB. More info: https://www.sorama.eu/