Conference_programme: 19.1 - Duct Acoustics

Lecture: Mirco perforated surfaces in HVAC application

Author(s): Sack Stefan, Åbom Mats

Summary:
This paper presents an acoustic study on the performance of micro-perforated plates (MMP) in heat, ventilation and air-conditioning (HVAC) ducts. MPPs are perforated plates with holes or slits in the sub mm range and perforation ratios between 1-10 %. When sound waves penetrate the perforation, friction at the hole surfaces leads to acoustic absorption. As MPPs exhibit high flow resistance together with a thin, stiff, and lightweight structure, they can be used to replace internal support structures in ventilation applications to make them acoustically dissipative with small or negligible leakage of flow across the MPP. As examples, two generic configurations are presented and studied. First, a circular orifice plate with perforation is compared to a similar plate without perforation. Second, a splitter plate made of micro perforation is presented.

Corresponding author

Name: Dr Stefan Sack

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Country: Sweden