Solving acoustic problems in buildings and facilities.
air handling unit on the rooftop
Engineering- and consultancy group Volantis has a clear focus on innovation, durability, safety, comfort and life-time performance. Volantis handles projects by looking at the situation from different perspectives. We have supported Volantis with a severe sound problem at an air handling unit on the rooftop of a nursing home. The people that live in the neighborhood could not sleep well due to the noise of this air handling unit.
Multiple measurements with the Sorama products were performed. As it was possible to visualize noise at different individual frequencies, the main noise source was clear: the return fan with the sound transfer path as its supply channel. This was a quite surprising and counter intuitive 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 neighborhood could sleep well again.
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.
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).
Low frequent noise in an apartment
In a renovated apartment complex the source of a low frequent noise was found by using the Sorama sound imaging products. By scanning the inner walls of the apartment it was found that vibrations in these walls were responsible for the high amounts of sound pressure in between 20-40 Hz. We found that the ventilation system caused the vibrations in the walls because of a little unbalance in its fan wheel. By decoupling the ventilation system from the inner walls, an improvement of 25-30 dB(A) was realized.
To reduce the noise level of the NOVY exhaust hood, measurements were performed in anechoic chamber using the Sorama Scan-A. Three different sides of the exhaust hood were measured. The trial solution resulted in an average noise decrease of 8 dB.