[Equest-users] modeling automatic isolation dampers

[Bishop, Bill]

Aaron,
 
I don't think MIN-FLOW-SCH can force zonal air flow to shut off
completely. I suggest creating custom hourly reports to track zonal
supply air flow of a few zones, to verify how the system is actually
being simulated.
 
One option would be to model a separate system for the floors that
operate at night. Then you could force the fans off at night for the
other 35 floors using the system fan schedule.
 
Unfortunately, you can't isolate the operation of the baseboards (unless
you create shallow perimeter zones separated from the interior portion
of the zones by air walls). If you set their control to "Thermostatic",
they will come on to meet the heating load first, followed by system
heating if needed. It may help to enter the actual baseboard capacities
rather than letting eQUEST autosize them.
 
What are you comparing to for your expected savings? If you have an
unrealistic setback/setup in both options that you are comparing, you
won't capture all of the potential savings.
 
Regards,
Bill
 
William Bishop, PE, BEMP, LEED(r) AP | Pathfinder Engineers & Architects
LLP
Mechanical Engineer
 
 134 South Fitzhugh Street                 Rochester, NY 14608
T: (585) 325-6004 Ext. 114            F: (585) 325-6005
wbishop at pathfinder-ea.com           www.pathfinder-ea.com
<http://www.pathfinder-ea.com/> 
P   Sustainability - the forest AND the trees. P 
________________________________

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of
Dahlstrom, Aaron
Sent: Saturday, March 26, 2011 2:46 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] modeling automatic isolation dampers
 
 
Anyone know how to shut off primary air flow to VAVS or PIU zones on a
schedule?
 
I am modeling a high-rise building with a central AHU and floor-by-floor
isolation dampers.
 
5 floors of the 40 operate at night, and their isolation dampers remain
open 24/7.
The remainder of the floors have isolation dampers that are commanded
shut at 6pm and opened at 6am.
(Heating is provided by separately controlled perimeter systems.)
 
The strategy I've been using is to schedule the zone MIN-FLOW-SCH to be
0 during the night and -999 during the day.
Then set an artificially aggressive setback / setup temp in the hopes
that the tstats will close the VAV boxes automatically.
 
However, this isn't resulting in the airflow / kWh savings I was
expecting...
 
THANKS!
 
Aaron Dahlstrom , PE, LEED(r) AP
In Posse - A subsidiary of AKF| 1500 Walnut Street, Suite 1414,
Philadelphia, PA 19102 
d: 215-282-6753| m: 267-507-5470| In Posse: 215-282-6800| AKF:
215-735-7290
e: ADahlstrom at in-posse.com | in posse web: www.in-posse.com
<http://www.in-posse.com/>  | akf web: www.akfgroup.com
<http://www.akfgroup.com/> 
 
 

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