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

[David Eldridge]

Sub zone or slave zone (used with one master zone) would be better terminology. A "dummy" zone is usually referring to a zone that doesn't really exist, but has to be created in order to provide the simulation a correct logical control.

Many of the system types can work this way.

As another poster mentioned you can still transfer heat between these spaces. Is it one large window, or many windows on top of each other? Make sure the window performance matches the proposed condition....one large window would be more weighted to the center of glass performance.

DSE Mobile

On Mar 14, 2013, at 9:08 AM, "Cliff Andrew" <Cliff.Andrew at hhangus.com<mailto:Cliff.Andrew at hhangus.com>> wrote:

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> [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<mailto: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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