rlafrance
Mechanical
- Dec 5, 2019
- 3
I’m working on a VAV system and I had a question on how to reduce pressure drop on my taps to the VAV terminal units. Generally the inlet of the VAV boxes have a high velocity, but, if I’m sizing my main for 0.1 in wg friction that’s relatively low velocity so there’s a huge pressure drop of trying to go low velocity to high velocity off a tap. Should I be sizing my main for something when I’m using a VAV box system? If we go medium pressure duct construction what’s the standard for sizing the duct is it velocity or friction based? Do the noise levels decrease if we use a medium pressure duct construction or is there a rule of thumb for sizing medium pressure duct for noise concerns? Thanks ahead of time for the help!