Caculating the Geometry of a rectangular duct diffuser
Caculating the Geometry of a rectangular duct diffuser
(OP)
I'm tyrying to design a rectangular cross section duct that tapers at the end. Over the length of the taper the duct is perforated. The purpose of the taper is to ensure that the air is distibuted evenly (ie consistent exit velocity)over the perforated section.
My difficulty is how do I calculate the angle of the taper to give the even air distribution I seek.
My difficulty is how do I calculate the angle of the taper to give the even air distribution I seek.





RE: Caculating the Geometry of a rectangular duct diffuser
Perforated supply air diffusers sometimes aren't suitable for comfort situations. Good for low air flow rates, like displacement ventilation and plenum supply. They tend to dump, not coanda the air.
Also look at fabric ducts that supply from rows of perforations.
RE: Caculating the Geometry of a rectangular duct diffuser