|
On most of the tests I was using pressure based openings; ie 65 psia inlet, 14.696 psia outlets. Using it this way, the avg velocity of all openings (Obviously won't happen because all 4 ports wont ever be open at once) is in the 1100-1300 fps range. The pressure at those openings is around 28-29 psia to each runner.
The pressure drop isnt a big problem when engineered correctly as the actual opening is incredibly large. It is thinner but much longer. Air is just as happy to run in a large rectangle as it would be in a smaller pipe. All the slit in the middle does is help distribute the air. Im not saying there is no pressure drop but in actuality there is less of a pressure drop doing it this way as opposed to just letting the air into a large plenum then going into a smaller runner.
|