Noise containment in Cogeneration plants

Despite its efficiency and environmental advantages, CHP still has its issues, most notably the excessive noise levels it can produce.

The benefits of cogeneration are well known, with these systems typically cutting costs by around 20% compared to the other existing solutions. CHP can also significantly reduce emissions cost-effectively due to the possibility to be applied to existing energy equipment. Such benefits, combined with the short ROI they can bring, have seen a rise in cogeneration installations.

Due to the increasing spread of CHP plants, noise mitigation has been a key point to meet regulatory and environmental noise requirements.

What are the noise sources?

There are a few components within and connected to the CHP system that can cause noise:

  • Engine
  • Boiler
  • Exhaust system
  • Ventilation systems
  • Fans or radiators
  • Vibration from equipment

A responsible supplier will look at all the various elements in the system to identify the noise source and therefore mitigate that noise. Your supplier should have options for noise attenuation across the system that can adapt to specific equipment needs. Health and safety compliance is paramount as workers need to be in a safe environment that operates to the safest noise levels.
Assigning the entire CHP plant (or at least the main equipment) noise abatement study to a single provider will facilitate a one-stop-shop solution for either the vendor and the operator with the aim of a total peace-of-mind targeted approach.

Noise reduction in CHP systems

When specifying the right noise control products and installations methods for CHP, detailed consideration of the specific system’s functions, location and permitted noise levels, as well as other pertinent factors, is required.

CHP systems should always be paired with some kind of acoustic enclosure which provides total protection against noise by isolating the source. It is important to be aware that the enclosure allows access for maintenance of the CHP unit, which will not compromise any noise mitigation.


Different engines have different noise profiles and designs so noise reduction must be balanced to that. Your Soundproofing partner should advise you with the noise reduction systems best designed to mitigate either the in-duct and the break-out noise to the targeted residual level at the desired measurement point.


Industrial plants, where boilers are used, need an effective degree of soundproofing.
Continuous and intermittent Vents to the atmosphere have to be silenced to the desired residual SPL, but sometimes due to their big dimension and the high Sound Power Level, the boiler structure itself has to be sound-proofed.


Similar consideration must be done for the exhaust system that should be implemented with a separate silencer located in the proximity of the flue. These exhaust silencers must meet the system requirements, without creating an excessive pressure drop as this can affect the CHP performance and efficiency.

Ventilation systems

Noise from the ventilation systems should be reduced by the use of a Silencer. Solutions as Ventilation & Duct Silencers reduce the generator In-duct noise and should be designed specifically for the application and to meet the customer needs.

Fan or Radiators (Auxiliary equipment)

For other equipment such as fans or radiators, often located near the CHP, the soundproofing solution need to be selected appropriately for the target noise rating required.


Stopson Italiana solutions for CHP

With an increasing demand for CHP systems across many sectors, stringent noise legislation, together with a general non-acceptance of environmental noise from industrial facilities, the implementation of soundproofing solutions is now a necessity for companies looking to significantly reduce their noise output.

However, as every plant installation is unique, there is no one-size-fits-all solution. Due to the need for detailed analysis, complex custom design, the variability of possible solutions and the regulatory requirements the necessity of a certified and experienced soundproofing supplier has emerged.

Stopson Italiana approach focuses on providing an optimal acoustic response, which satisfies functional requirements with the best price/performance ratio.


    Circular or rectangular shape, atmospheric or pressurized for any gas, temperature range, 
and applications, providing sound attenuation up to 70 dB and reduce residual noise to a sustainable level. → KNOW MORE


    Conceived for engine exhaust these silencers are designed to be used on diesel and gas engines and, in certain cases, on industrial low/middle power gas turbines. Developed in our research Lab and tested on numerous industrial applications, our exhaust silencers are based on absorption and/or resonance sound wave attenuation principle. → KNOW MORE


    Ventilation and Duct Silencers, both of rectangular or cylindrical shape, have been designed to reduce noise level through the duct generated by any sound source, such as fans, conditioning units, etc. Low/high flow rates and available pressure drops can be achieved, depending on the type of source. → KNOW MORE


    Shaped around noisy equipment, indoor or outdoor, on-base or off-base, designed to provide optimum noise attenuation in any critical environment. Made of modular acoustic panels and linings for sound isolation while ensuring equipment maintenance, ventilation, weather protection, and fire safety. → KNOW MORE


⟶ For More Information about Stopson Italiana soundproofing solutions click HERE