[Trace-users] Trace-users Digest, Vol 66, Issue 1
Wohlgenant, Terry
twohlgenant at DLRGROUP.com
Thu Jun 5 11:05:45 PDT 2014
I have used the same strategy. But raising the supply air volumes to the critical room above that required by your load simulation has the effect of raising the minimum air flow. That is what actually brings the percentage of OSA down. Raising the minimum stop on the VAV terminal unit that serves that room is probably the more correct way of handling this. Raising the minimum stop leads to re-heat to maintain room temperature which results in higher energy usage so watch your energy usage in your modeling runs and balance the re-heat need against higher OSA values. What will also help is to look at ASHRAE interpretation IC 62.1-2007-17. ASHRAE 62.1 does not require OSA in rooms that are not normally occupied.
Terry L. Wohlgenant, CIPE, BEMP, LEED AP BD+C
Mechanical Design | Senior Associate
twohlgenant at dlrgroup.com
DLR Group
Architecture Engineering Planning Interiors
o: 602-381-8580
6225 North 24th Street, Suite 250 Phoenix, AZ 85016-2042
dlrgroup.com | listen.DESIGN.deliver
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Today's Topics:
1. Percent Outside Air (UNCLASSIFIED) (Eurek, John S NWO)
2. Re: Percent Outside Air (UNCLASSIFIED) (Scott Parker)
3. Re: Percent Outside Air (UNCLASSIFIED) (Michael Hardy)
4. REMINDER - onebuilding.org mailing lists (Jason Glazer)
----------------------------------------------------------------------
Message: 1
Date: Tue, 3 Jun 2014 20:16:01 +0000
From: "Eurek, John S NWO" <John.S.Eurek at usace.army.mil>
To: "trace-users at lists.onebuilding.org"
<trace-users at lists.onebuilding.org>
Subject: [Trace-users] Percent Outside Air (UNCLASSIFIED)
Message-ID:
<E777FD5A41D3B04A83296213737A85D7092E376C at EIS-MB0501WPC.eis.ds.usace.army.mil>
Content-Type: text/plain; charset="us-ascii"
Classification: UNCLASSIFIED
Caveats: NONE
I have an Variable Volume Reheat (30% Min Flow Default) and used the System Ventilation Flag to ASHRAE 62.1 with Vent Rest. When I ran the model the system was running 100% Outside air. I looked at the 62.1 report and saw that there were corridors and storage rooms driving the 100%, so I set the air flow for those rooms higher. I repeated this process of finding the critical zones and increasing the supply cfm to drive down the outside air percentage.
I've got it down to 43.4%, but is there a better way to accomplish this?
When I run it with summing outside air requirements, the highest zone is 32% outside air, but the values don't comply with 62.1.
Is the best method just to find the critical zones and increasing the cfms and repeat?
Classification: UNCLASSIFIED
Caveats: NONE
------------------------------
Message: 2
Date: Tue, 3 Jun 2014 20:23:12 +0000
From: Scott Parker <sparker at aeieng.com>
To: "Eurek, John S NWO" <John.S.Eurek at usace.army.mil>,
"trace-users at lists.onebuilding.org"
<trace-users at lists.onebuilding.org>
Subject: Re: [Trace-users] Percent Outside Air (UNCLASSIFIED)
Message-ID: <6f376b91c33841e1a386a48256d00382 at MSN-EX2.aeieng.lan>
Content-Type: text/plain; charset="us-ascii"
I prefer manual calculations, but if you want to use Trace to do the ventilation calculations then you can set a "Max Vent (Z) Ratio Allowed". You can try a little trial and error but likely between 30 and 60%.
[cid:image001.png at 01CF7F48.1C2BF750]
SCOTT PARKER
-----Original Message-----
From: Trace-users [mailto:trace-users-bounces at lists.onebuilding.org] On Behalf Of Eurek, John S NWO
Sent: Tuesday, June 03, 2014 4:16 PM
To: trace-users at lists.onebuilding.org
Subject: [Trace-users] Percent Outside Air (UNCLASSIFIED)
Classification: UNCLASSIFIED
Caveats: NONE
I have an Variable Volume Reheat (30% Min Flow Default) and used the System Ventilation Flag to ASHRAE 62.1 with Vent Rest. When I ran the model the system was running 100% Outside air. I looked at the 62.1 report and saw that there were corridors and storage rooms driving the 100%, so I set the air flow for those rooms higher. I repeated this process of finding the critical zones and increasing the supply cfm to drive down the outside air percentage.
I've got it down to 43.4%, but is there a better way to accomplish this?
When I run it with summing outside air requirements, the highest zone is 32% outside air, but the values don't comply with 62.1.
Is the best method just to find the critical zones and increasing the cfms and repeat?
Classification: UNCLASSIFIED
Caveats: NONE
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Message: 3
Date: Tue, 3 Jun 2014 13:24:48 -0700
From: "Michael Hardy" <mhardy at blackoakengineering.com>
To: "'Eurek, John S NWO'" <John.S.Eurek at usace.army.mil>,
<trace-users at lists.onebuilding.org>
Subject: Re: [Trace-users] Percent Outside Air (UNCLASSIFIED)
Message-ID: <008001cf7f69$de9b3140$9bd193c0$@blackoakengineering.com>
Content-Type: text/plain; charset="us-ascii"
I usually delete the ventilation rates for those non-critical "critical"
areas so they don't drive the minimum OSA settings. Janitor's closets are the worst, but then I use transfer air and exhaust for those which isn't modeled very well anyway.
Michael L. Hardy, PE, F.NSPE
Black Oak Engineering, Inc.
Cell 503.314.5244
-----Original Message-----
From: Trace-users [mailto:trace-users-bounces at lists.onebuilding.org] On
Behalf Of Eurek, John S NWO
Sent: Tuesday, June 03, 2014 1:16 PM
To: trace-users at lists.onebuilding.org
Subject: [Trace-users] Percent Outside Air (UNCLASSIFIED)
Classification: UNCLASSIFIED
Caveats: NONE
I have an Variable Volume Reheat (30% Min Flow Default) and used the System
Ventilation Flag to ASHRAE 62.1 with Vent Rest. When I ran the model the
system was running 100% Outside air. I looked at the 62.1 report and saw
that there were corridors and storage rooms driving the 100%, so I set the
air flow for those rooms higher. I repeated this process of finding the
critical zones and increasing the supply cfm to drive down the outside air
percentage.
I've got it down to 43.4%, but is there a better way to accomplish this?
When I run it with summing outside air requirements, the highest zone is 32%
outside air, but the values don't comply with 62.1.
Is the best method just to find the critical zones and increasing the cfms
and repeat?
Classification: UNCLASSIFIED
Caveats: NONE
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------------------------------
Message: 4
Date: Wed, 04 Jun 2014 15:03:00 -0500
From: Jason Glazer <jglazer at gard.com>
To: bldg-sim at onebuilding.org, equest-users at onebuilding.org,
hap-users at onebuilding.org, trace-users at onebuilding.org,
virtual-sim at onebuilding.org
Subject: [Trace-users] REMINDER - onebuilding.org mailing lists
Message-ID: <538F7B74.4060106 at gard.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
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