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NEWSWe specialize in reducing noise emissions and increasing the performance of HVAC and industrial systems.
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For us, the use of StratocellWhisper with a thickness of 50 mm or more in our sound insulation hoods and sound insulation walls for HVAC systems is undisputed. The material properties and the sound effect speak for themselves. For projects with very high sound insulation requirements, we also install a cavity between the insulation and the external panels.This results in several acoustic and technical advantages: 1) Significantly improved sound absorption: A cavity of 50 mm significantly increases sound absorption, as the distance between the wall and the insulating material acts like a resonator. This means that low-frequency sound waves are better absorbed, and the reflected sound energy is reduced. This is often used specifically in acoustics to increase the effectiveness of absorbers. 2) More efficient use of material properties: Stratocell Whisper is already designed as a sound-absorbing polyethylene foam that offers high sound insulation values thanks to its closed-cell structure. In combination with cavities, the effect of the material is further enhanced, as layers of air act as an additional damping layer. 3) Improved mechanical decoupling: The distance reduces the direct coupling between the wall and the insulating material, which further reduces the transmission of structure-borne sound and vibrations. On the side of the insulating material, we naturally do not cover it with perforated sheets or similar, so that the entire absorption surface of the insulating material is used. Conclusion: A cavity of 50 mm when installing Stratocell Whisper ensures significantly higher sound absorption, improves acoustic effectiveness and offers practical advantages in terms of installation and technical equipment. ity to improve sound absorption 
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The use of central heat pumps and cooling systems to supply districts or to feed district heating networks is becoming an increasingly important topic. We are talking about systems with very high air volumes and multi-stage compressors. When planning such systems, noise protection is a key issue in both purely residential areas and mixed areas. Passive noise measures such as acoustic enclosures, baffles or baffles can be used to control high frequencies. However, the low sound frequencies between 32 and 500 Hz often become an uncertainty factor during planning when it comes to sound emissions during effective operation. With our latest acoustic enclosures for large projects, we therefore integrate ANC technology directly into our acoustic enclosure design. This allows us to combine passive and active noise protection in our enclosures. The first pilot projects with this combination are now underway. The major challenge we are already seeing today is the rapid adaptation of ANC counter-noise to the rapidly changing operating conditions of the systems, which continuously change the sound field to be reduced. The correct positioning of the sensors and actuators and the rapid processing of a large amount of data (signals) will be the next milestones in practical operation. The combination of IoT, which is now a standard setup for modern heat pumps and refrigeration systems, and AI is the next stage of development for evaluating sensor data for the predictive control of ANC technology. In our opinion, the combination of ANC technology and passive noise control is only worthwhile for large systems at the current state of the art. For smaller systems in small residential buildings, it will take some time before the use of ANC technology can be economically justified.  |
AuthorWe specialize in reducing noise emissions and increasing the performance of HVAC and industrial systems. Archives
April 2025
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