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The acoustic properties of common HVAC plena.

Author(s) : MOURATIDIS E., BECKER J.

Summary

The HVAC plenum is commonly applied as a means to reduce problematic low-frequency noise produced by mechanical equipment in ducted systems. Through the ASHRAE-sponsored research project RP-1026, rigorous testing enabled the identification of comprehensive attenuation properties for common HVAC plena. A two-stage prediction approach resulted, which applies an improved version of the Wells equation for mid- to high-frequency attenuation (5000 Hz upper frequency limit), quantified as a transmission loss, and a surface area and wall characteristic model for the critical low-frequency transmission loss (50 Hz lower frequency limit). This method has improved the prediction accuracy of flow-through type HVAC plena with a volume range of 0.5-30 m3. In addition, this work has identified acoustical effects for seven different wall-lining systems and typical geometric variables, such as opening offsets, opening ratio variables, and multiple openings.

Details

  • Original title: The acoustic properties of common HVAC plena.
  • Record ID : 2006-0878
  • Languages: English
  • Source: ASHRAE Transactions. 2004 Annual Meeting, Nashville, Tennessee, USA. Volume 110, part 2 + CD-ROM.
  • Publication date: 2004

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