[Equest-users] Merging 3 zones for 1 constant volume AHU

[Cam Fitzgerald]

Cliff,

 

Have you tried setting the floor construction to an air wall with U=1.0?
This should allow your heat to flow freely between the two zones.

 

Hope this helps!

 

Cam Fitzgerald

 

Energy Opportunities/a 7group company

 

 

 

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Cliff
Andrew
Sent: Thursday, March 14, 2013 10:03 AM
To: equest-users at lists.onebuilding.org; David Eldridge
Subject: [Equest-users] Merging 3 zones for 1 constant volume AHU

 

Thanks David,

 

I was wondering about this. The spaces would need to be connected somehow
though to allow their heat loads to transfer up and down in the space(they
are on an exterior wall that is completely covered with windows, from the
floor of the second level to the ceiling on the 3rd level.

 

Would using a single zone reheat system, setting the second floor to the
control zone, and the other two as dummy zones with no reheat available
work? Or would a different system make more sense?

 

Thanks again,

 

Cliff Andrew, B.Sc.(Eng.), EIT

 

 

From: David Eldridge [mailto:DEldridge at grummanbutkus.com] 
Sent: March-13-13 9:04 PM
To: Cliff Andrew
Subject: RE: Merging 3 zones for 1 constant volume AHU

 

Can you assign the zones that don't have thermostats to be sub zones of the
one that does? I think you've modeled this correctly; this approach will
capture the effect from a thermostat being located in a less optimal space.

 

You can still make all three zones constant volume for their share of the
total airflow.

 

David

 


 

David S. Eldridge, Jr., P.E., LEED AP BD+C, BEMP, BEAP, HBDP

Grumman/Butkus Associates

 


 

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Cliff
Andrew
Sent: Wednesday, March 13, 2013 6:49 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Merging 3 zones for 1 constant volume AHU

 

Hi,

 

I have made the mistake of setting up 3 different zones for what should be a
single zone with a constant volume AHU system. Currently 2 of the three
zones are on the 3rd Floor, and the other zone is on the Second Floor. I was
wondering if there is a way I can join these three zones, or if there is an
alternative way to model this system?  

 

Best Regards,

 

Cliff Andrew, B.Sc.(Eng.), EIT

 

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