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PECO - Model HPSC 1 AND HPSC 1-SE -Air Intake Silencer
When a large diesel or gas powered two/four stroke engine or turbine is used, large quantities of air are drawn into the equipment for combustion purposes. These air induction systems may be naturally aspirated or use turbo chargers or compressors to increase the air pressure fed into the fuel mixing chambers or cylinders to increase efficiency or performance.
The speed of the air entering the system can create a substantial amount of noise. In addition, the high rotating speed of the turbo charger or compressor, which is directly connected upstream in relation to the intake position, may cause noise to be radiated down the induction pipe and through the intake filter and so out into the atmosphere. This is particularly noticeable on very large rotating induction systems where the noise levels may exceed 120dB in the higher 2000 to 4000 Hertz frequencies.
The design has a central pod, partially obscuring the line of sight which combats the flow velocity noise associated which the vast quantities of cool air required to feed all forms of internal combustion engines, small gas turbines, boliers and blowers of all sizes and configurations.
With additional modifications the silencer range can be adapted for use inline on low pressure steam, air or gas pipelines, where noise radiation may be evident. Under slightly different circumstances the design can be used for medium to high velocity exhaust and air discharge applications in chimneys, exhaust stacks and flueds. The designs can be extended to longer lengths, increasing the insertion loss with little or no increase in pressure drop across the unit. This makes the concept useful for many arduous tasks and installations which other designs cannot match.
The HPSC 1 and HPSC 1-SE (Side Entry) type Air Intake Attenuation Silencer is a simple energy converter utilising both the flow and energy in the intake duct and the upstream noise from axial or centrifugal fans, turbochargers, superchargers, roots blowers or similar air moving equipment to excite individual fibre of various lengths in the acoustic infill to vibrate and create friction, resulting in heat, which is then dissipated to the passing airflow.
The designs also inadvertently use the Helmholtz principle to increase the insetion loss to approximately 25dB(A) to give a clean type silencer with a low pressure drop and good capabilities at 500 hertz and greater in the octave band spectrum.