Industrial heat engines require the use of mufflers for high-temperature fluid, since their exhaust, which typically exceeds 425 degrees C and can reach 550 degrees C, is a noise source that must be treated to prevent sound pollution in the environment.

For such applications, reactive mufflers or silencers (i.e. devices whose principle is based on the reflection of acoustic waves in relation to changes in the internal geometry of the ducts, perforated or not, guiding the flow) are often appropriate for obtaining an insertion loss at low frequency, which can be combined with the implementation of absorbing materials (involving a dissipative effect) which make it possible to obtain additional acoustic performance (generally desirable) at medium and high frequency.

The sizing of mufflers for high-temperature fluid requires the consideration, through dedicated simulation tools, available at ITS, of the acoustic requirements of the project (in relation to the unsilenced sound power spectrum of the engine exhaust, and to the noise reduction objective) and also the constraints of the project in terms of aerodynamics in relation to the turbulent flow to be considered (always: acceptable maximum total pressure loss, sometimes: minimum ejection speed allowed).

Such requirements are generally antagonistic and require a compromise in terms of performance, in some cases limited by the space available for the silencers.

ITS will participate in the construction of 6 mufflers (silencers) for high-temperature fluid as part of the construction of a power plant based on heat engines.

The experience of ITS and of its trading partners will, no doubt, allow a limitation of the noise due to the exhaust of these engines (by the means of mufflers for high temperature fluid) to preserve the neighborhood which will be significant and lasting, due to the quality of marketed soundproofing equipment.