Hi,
I wish to calculate HVAC noise, using HVAC drawings. Does anyone know how to calculate the regenrated noise from elements like dampers, bends and T junctions (and also duct reduction)?
Is there any simple formula to apply ?
I am not able to find such thing in the ASHRAE Chapt. 48 Noise and Vibration). My only chance looks like to pick the equations from CIBSE Guide B5 Appendix A2, but I do not have access to the pressure loss factor (i only know flow velocity and local pressure at sections of the HVAC system).
Sylvain,
This out of print book, by Douglas Reynolds, is the basis for some of the commercial software used do do such calculations.
Mike Schwob
https://www.google.com/search?kgmid=/g/12bnzcmg2&hl=en-US&kgs=911915a345bdcf46&q=Algorithms+for+HVAC+Acoustics&shndl=0&source=sh/x/kp&entrypoint=sh/x/kp
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