60-61 Performance evaluation of lined duct bends -Experiment vs. theory
Keywords:Acoustic spectroscopy, Climate control, Numerical analysis, Acoustic propagation, Acoustical performance, Empirical relations, Field measurement, High frequency, HVAC system, In-buildings, Lined ducts, Liner material, Performance evaluation, Propagation constant
AbstractAcoustical performances of simple elbow silencers, used in building HVAC systems, have been conventionally evaluated using empirical relations based on laboratory and/or field measurements. The current investigation has made use of COMSOL, a powerful multiphvsics numerical analysis tool and has attempted to provide results based on multi-dimensional analysis. The acoustic propagation in the liner material uses the complex propagation constant and complex density of bulk reacting material. A given acoustic field was assumed at the inlet of the elbow and the outlet is connected to a long anechoic termination. To accommodate high frequency calculation, COMSOL suggests using a length of pipe in front of the elbow within which scattered acoustic field is calculated to provide the required acoustic field at the inlet of the lined (or unlined) elbow.
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