[Equest-users] floor area used by VAV system

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Hello all
I am working on a 20 storey office building which has 20125 sf per floor.
I have assigned 1 VAV system /floor area.

I realized that the return air path plays a big role. When I use plenum
return (since I have 4ft plenum in my design), the floor area used by system
in SV-A report is 20125 sf which is correct.

As soon as I change the path to ducted, floor area doubles.

Does anyone know why this is happening?

Any thoughts will be helpful.



Results with return air path as *plenum- the floor area is correct with
plenum return*

Results with return air path as *ducted- floor area doubles with changing to

Dkhowal's picture
Joined: 2011-09-30
Reputation: 0

When you change the path to ducted, the wizard changes plenum zones to type "Unconditioned" rather than "Plenum". Unconditioned zones are counted in the total area on the SV-A report, plenum zones are not.

Jeremy McClanathan, P.E., BEMP, HFDP, LEED(r) AP BD+C

Jeremy McClanathan's picture
Joined: 2011-09-30
Reputation: 200