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Analysis of Flow and Sound Propagation in HVAC Ducts Using Two-Port Network Theory
Ain Shams Univ, Grp Adv Res Dynam Syst ASU GARDS, Cairo, Egypt..
Ain Shams Univ, Grp Adv Res Dynam Syst ASU GARDS, Cairo, Egypt..
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Ultrasound. Royal Inst Technol KTH, Marcus Wallenberg Lab Sound & Vibrat Res, Stockholm, Sweden..ORCID iD: 0000-0001-7898-8643
2014 (English)In: ASHRAE TRANSACTIONS 2014, VOL 120, PT 2, AMER SOC HEATING, REFRIGERATING AND AIR-CONDITIONING ENGS , 2014Conference paper, Published paper (Refereed)
Abstract [en]

Duct Networks (e.g. HVAC) are designed to maintain flow rates at acceptable noise levels. To accurately analyze the acoustics in a duct network in the high frequency region, the following mechanisms need to be modeled: The sound power injected into the network by sound sources (e.g. Fans), the flow noise generated in different parts in the network (e.g. junctions), and the noise reduction across different parts of the network. Traditionally only transmission of sound power with no reflection is considered in standards, e.g., ASHRAE (American Society of Heating, Refrigerating and Air Conditioning Engineers) or VDI (The Association of German Engineers), for analyzing noise in HVAC systems. In this paper, a more general approach is considered based on dividing the duct network into two-port elements where each element can be described by a 2x2 scattering matrix. The state variables are taken as acoustic power flow in the up/downstream directions. Junctions are described by multiports depending on the number of elements connected to the junction. A source vector is added to each element and junction to handle sound power injection by fans or other aero-acoustic sources. The advantage of this approach is that the same formalism (based on two-port network theory) can be used to analyze the low frequency range, the flow distribution and the pressure drop across each network path as well as the high frequency range. This two-port power based formulation was earlier validated against a detailed HVAC example in VDI 2081 part2. In this paper, it is validated against a real-life case study and compared with the measurements.

Place, publisher, year, edition, pages
AMER SOC HEATING, REFRIGERATING AND AIR-CONDITIONING ENGS , 2014.
Series
ASHRAE Transactions, ISSN 0001-2505 ; 120
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-243763ISI: 000346573500069ISBN: 978-1-936504-82-4 (print)OAI: oai:DiVA.org:kth-243763DiVA, id: diva2:1288065
Conference
ASHRAE Annual Conference, JUN 28-JUL 02, 2014, Seattle, WA
Note

QC 20190212

Available from: 2019-02-12 Created: 2019-02-12 Last updated: 2019-02-12Bibliographically approved

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