[Bldg-sim] How have you approached... (UNCLASSIFIED)

[James Hansen]

I agree with John, I've done this on a model before and its painful.  Assuming there are 10 hours in a work day, I set up 10 different occupancy and lighting schedules, each schedule being essentially identical except for a different hour of zero occupancy / lighting.  I then applied these 10 schedules to the different office zones on a floor so that specific areas were vacant from 8am-9am, some vacant from 9am-10am, etc.  And then for my system, I assumed relatively consistent 10% non-occupied conditions and reduced the OA at the system level accordingly.  If your non-occupied conditions are more drastic (30%), obviously you can set up your schedules differently.

However, if your primary air is also cooling (and not some sort of DOAS chilled water VAV box), then you are going to also have to specify 10 separate thermostat schedules (really 20 with heating and cooling) so that the rooms do not have unmet load hours.  I'm assuming you go into setback mode when the offices are unoccupied.

However, this was under v2.0, so that was a long time ago and reviewers were not as critical in their reviews.

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-----Original Message-----
From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Eurek, John S NWO
Sent: Wednesday, July 20, 2011 9:31 AM
To: Nick Caton; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] How have you approached... (UNCLASSIFIED)

Classification: UNCLASSIFIED
Caveats: NONE

Nick,

I would do it with schedules.  This would be the long method.

I have the same controls and have not got around to model it.  I would also
make many schedules.  A different schedule for occupancy, lights, equipment,
ect.  Also if this applies to a lot of rooms, you'd likely make multiple
schedules, one assuming that the room is empty from 9~10 another room empty
from 2~3.  (The inverse for meeting rooms, if you have multiple meeting
rooms, not all meetings will happen at the same time.)


"Is Freedom a small price to pay to stop Global Warming?"

John Eurek PE, LEED AP
Mechanical Engineer,

-----Original Message-----
From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Nick Caton
Sent: Tuesday, July 19, 2011 3:59 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] How have you approached...

I have a precedent question for everyone... this is not a "how to" procedural
question for any particular software, but to simply feel out what has worked
for others in the past:

 

Here's a quick description of the situation at-hand:  a VAV terminal unit
with a "normal" minimum damper position (say, 30%) is tied by relay to the
space occupancy sensor, which also controls the lights.  Upon sensing space
vacancy, the minimum airflow damper position is reset to 0% (airflow is
permitted to stop, provided thermostat temperature set point is satisfied).
Upon sensing occupancy, the preset minimum damper position is restored.

 

For LEED/USGBC-reviewed energy models, can anyone relate success in modeling
this or a similar energy-saving behavior in the proposed model, distinct from
the baseline?  If so, what approach did you use to model this behavior and/or
quantify the energy savings? 

 

I was discussing the possibilities with some colleagues and have a few ideas
for approaches that might all be justifiable, ranging from simple (and quick)
to complex (and time-consuming).  

 

There are likely multiple "right" answers here, but I am hoping to identify
some precedent to understand what we can anticipate the LEED reviewership
will accept.  

 

Thanks in advance!

 

~Nick

 

cid:489575314 at 22072009-0ABB

 

NICK CATON, P.E.

SENIOR ENGINEER

 

Smith & Boucher Engineers

25501 west valley parkway, suite 200

olathe, ks 66061

direct 913.344.0036

fax 913.345.0617

www.smithboucher.com 

 


Classification: UNCLASSIFIED
Caveats: NONE


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