Abstract
The American Society for Heating, Refrigeration, and Air Conditioning Engineers (ASHRAE) has several practical resources for flow noise prediction. There are reference tables for maximum air velocities for a given background noise rating as well as tables for maximum “free area” speeds for supply diffusers or return registers. For other duct fittings, engineers may use a variety of algorithms to predict octave band sound power levels. Experiments have demonstrated a direct relationship between flow noise and duct size, aspect ratio, and pressure drop. Currently, few prediction methods accurately take these factors into account because the underpinning algorithms are based on a limited set of ductwork sizes. To better understand how these factors impact airflow generated noise, ASHRAE has conditionally approved Work Statement 1919: The effects of duct size and aspect ratio on flow noise in elbows. This paper will review past literature, highlight shortcomings of current prediction methods, and discuss the proposed methodology for upcoming research.
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