[Equest-users] Exhaust air routes

[Vikram Sami]

Lars,

Not sure if this is what you're looking to do. I haven't tried this for
a chain of more than two zones, but you can specify the outside air
coming from a particular zone in eQUEST using the "OA-FROM-SYSTEM"
keyword. You have to be careful with this to define the OA system before
the system it feeds (i.e. if system 1 has an OA-FROM system2, but system
2 has not been defined yet in the INP file, you will get an error. 

 

Another thing to watch out for is that when you use the OA-FROM, I don't
think eQUEST calculates the cooling effect of the ventilation air. You
might have to trick the program into accounting for that using an
internal energy source (process) with a negative value. This is easier
with a constant volume OA supply, but if you really want to you could
write a schedule for the VAV supply - it's pretty tricky. 

 

Vikram Sami, LEED AP 
Direct Phone 404-253-1466 | Direct Fax 404-253-1366 

LORD, AECK & SARGENT ARCHITECTURE



 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Lars
Fetzek
Sent: Monday, August 10, 2009 9:47 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Exhaust air routes

 

Hello,

 

    The building floor that I am presently modeling has several
conditioned zones and two unconditioned zones.  The conditioned zones
are various offices.  The unconditioned zones are restrooms and an
electrical room.  The conditioned zones exhaust to each other and,
ultimately, to the unconditioned zones via hallways, doorways, etc.  The
unconditioned zones exhaust to the outside (via fans).

    How can I explain to eQuest that, for example, conditioned zone A
exhausts to conditioned zone B?  Also, how can I explain to eQuest that
conditioned zone D exhausts X% to the electrical room (and thus to
outdoor exhaust fans) and Y% to conditioned zone C?

    In case it matters, the ceiling is open and the return ductwork
terminates in one spot.  Accordingly, even return air must flow among
the conditioned zones.

    Thanks, as always, for your helpful replies.

 

Lars Fetzek, EI

Phoenix Engineering Group

Tampa, Florida

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