Air Quality and Acoustical Ventilation Systems

ArtUSA engineers design quiet ventilation systems. Quiet ventilation is needed when breakout noise is a problem or when the ventilation system itself is the dominant noise source.

Industrial equipment creates heat build-up inside an enclosure or facility. Channeling air over the equipment supplies cooling and removes heat. Noise from equipment inside the building escapes through openings that intake and exhaust cooling air. These openings must be silenced if it is not to disturb the surrounding environment.

In some cases, the interior of the building is quiet but noise from the large ventilation fans that bring in and expel air is a problem that must be attenuated.

To treat noise breakout or fan noise, we utilize:

• Quiet fans (axial or radial)
• Acoustically lined ridge vents
• Acoustically lined weatherhoods
• Acoustically lined plenums
• Acoustically lined louvers
• Custom-designed silencers

Silenced Turbine Intakes & Exhausts

ArtUSA builds quiet into turbine intake and exhaust systems as part of our total acoustical facility design, treating intake and exhaust noise with:

• Inlet and exhaust silencers
• Air inlet filtration
• Duct sound abatement

Inlet and Exhaust Silencers

ArtUSA guarantees the quiet performance of the silencers we supply. Our silencers are tested for various DIL's (Dynamic Insertion Losses) to arrive at the silencer design requirements needed to meet the noise level target while maintaining acceptable pressure drops. We installs:

• Intake silencers
• Exhaust silencers in a vertical stack
• Exhaust silencers in horizontal ductwork
• HRSG (Heat Recovery Steam Generator) exhaust stack silencers

Air Inlet Filtration

Our acoustical, mechanical and structural engineers can design complete air inlet silencing systems, including filter houses of various configurations.

Duct Sound Abatement

Breakout noise and vibrations from intake and exhaust ducts can be enormous depending on engine size. To treat duct noise, IES offers acoustical:

• Lagging
• Double wall construction
• Vibration isolation
• Acoustic expansion joints

Gas Turbine Silencers

The silencing of gas turbine installations in industrial environments is basically a problem of attenuating the noise from the atmospheric inlet and the exhaust openings. In installations in residential and rural areas, the sound from the gas turbine enclosure, auxiliaries, and driven equipment also must be considered in the silencing program. Some degree of attenuation can be attained by natural factors, such as divergence, directivity, air absorption, and duct configurations. Further sound control, however, must be obtained through the use of adequate silencers.

Silencers normally contain one or more passages which are lined with sound absorbing materials, incorporated in structures that protect them from erosion from air flow. To attenuate low frequency sounds, thick baffles widely spaced should be employed for optimal performance; whereas for high frequency sounds, the best absorption is obtained by using thin baffles closely spaced. Middle frequency sounds can be absorbed by both thick and thin baffles, but intermediate thickness baffles are more desirable. Increased attenuation, at times, may be achieved by incorporating bends or elbows into the silencer.

Silencers should be as short in length as possible, consistent with reasonable cross sectional areas and pressure drop. These aerodynamic considerations mean that silencers must permit airflow of the gas turbine unit to continue unhampered.

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