About the return air of VAV system
About the return air of VAV system
(OP)
if there are lots of VAV box at the supply terminal, how to design the return duct? There will be a return fan because return ducts reach to each room.
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About the return air of VAV system
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RE: About the return air of VAV system
You can minimise the duct by running into the ceiling plenum and stoping at the shaft wall. Size approx 5 m/s , keep the velocity down for noise reasons. if you have full height wall at each room, you may wan to extend the duct to this areas or eles have transfer ducts. Size the ducts the same 0.8pa/m. suck from the ceiling space is cheapest and easiest.
RE: About the return air of VAV system
Duct all supplies, duct all returns.
Return volume is what max supply volume is minus building exhausts and whatever % OA you are using to maintain slightly positive pressure in what I will guess are office spaces.
RE: About the return air of VAV system
Take the "V" out of HVAC and you are left with a HAC(k) job.
RE: About the return air of VAV system
RE: About the return air of VAV system
While, when the VAVs reduce the S/A volume, how will the supply and return fans correspond?
With Return fan tracking and using air flow measuring stations (AFMS), one on RA fan, one on SA fan (in fan scrolls), and one in OA intake duct.