<div>First of all, I usually set outdoor air rates by zone, but there is one thing that I think I should add to this discussion:<br></div><div><br></div><div>If (in reality) you have a central ventilation system that provides constant outdoor air, and a zone system that provides heating and cooling, as we all know, eQuest requires that only one system be modeled. The challenge arises with how to handle delivery of ventilation air. If (in reality), your zone system has a fan that cycles on and off, then eQuest will only model ventilation air for the fraction of the hour that the fan is ON. If the fan is variable, even if the ventilation rate is set to "Fraction of Design", if the airflow required drops below the OA fraction, you will not get full ventilation. Therefore, for these systems, I always set my fan flow to "variable" and manually set my minimum flow rate equal to the OA fraction.</div>
<div><br></div><div>--</div><div>Karen</div><div><br></div><div><br></div><br><div class="gmail_quote">On Wed, May 26, 2010 at 1:16 PM, David Reddy <span dir="ltr"><<a href="mailto:david.j.reddy1@gmail.com">david.j.reddy1@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div bgcolor="#ffffff" text="#000000">
One problem to be aware of, especially if you are creating your project
with an older version of eQUEST, is that unless you specify a
SYSTEM:MIN-AIR-SCH with the appropriate night-time values (either ~0.0
for no OA, or 0.001 for nighttime economizer operation), night cycling
of the systems (as specified by Appendix G) will include the minimum OA
flow. 90.1 requires OA dampers to be closed whenever the system runs
during unoccupied hours (there are some exceptions), and in many
climates, this will lead to excess nighttime heating energy. Also,
since the 90.1 baseline building typically has poorer envelope
performance, the baseline systems are likely to cycle more at night,
and therefore, not including this schedule will make the proposed
building incorrectly appear better. One issue with specifying
nighttime economizer operation (Schedule flag = 0.001), is that for
multizone systems, even during unoccupied hours, the economizer will be
used to maintain the MIN-SUPPLY-T or COOL-MAX-RESET-T. During heating
periods, this can lead to unnecessary reheat energy, which can be
somewhat mitigated by setting an appropriate ECONO-LOW-LIMIT
temperature. I typically prefer to just set the nighttime MIN-AIR-SCH
value to some small value (to simulate damper leakage), since most of
the buildings I have analyzed have not needed a significant amount of
nighttime cooling. <br>
<br>
I believe OA control options during night cycling were added as an
explicit wizard option in the last eQUEST release. In the wizard,
setting the Cycle Fans at Night property to "Cycle Fans (no OA at
night)" will create both a MIN-AIR-SCH with nighttime OA values to 0.0
and set the NIGHT-CYCLE-CTRL keyword. However, this reinforces
Jeremy's suggestion to check a few detailed SYSTEM and other command
hourly reports (this issue would not be apparent int he SV-A or other
summary reports) to make sure your model is behaving as expected...<br>
<br>
<pre cols="72">David Reddy
360 Analytics
Building Energy Analysis Consultants
mail: 12354 16th Ave NE, Seattle, WA 98125
phone: 206.406.9856
email: <a href="mailto:david@360-Analytics.com" target="_blank">david@360-Analytics.com</a></pre><div><div class="h5">
<br>
On 5/26/2010 9:03 AM, Jeremy McClanathan wrote:
</div></div><blockquote type="cite"><div><div class="h5">
<div>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)">I
typically specify cfm/sf at
the zone level for both the proposed and the baseline models. This
should
ensure both models are operating with the same cfm.</span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)"> </span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)">One
mistake I made when I was
learning eQuest was I specified OSA of a VAV system at the system level
thinking that the MIN-OUTSIDE-AIR was the min ratio to design flow,
when it is
actually the min ratio to heating flow. So, I was getting less outside
air than expected. I would check the detailed reports or possibly a
custom report to make sure both models are operating with an equal
amount of
OSA.</span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)"> </span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)">Jeremy</span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)"> </span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)"> </span></p>
<p class="MsoNormal"><b><span style="font-size:10pt;font-family:"Myriad Web Pro";color:gray">___________________________________________</span></b></p>
<p class="MsoNormal"><span style="font-size:10pt;color:olive"> </span></p>
<p class="MsoNormal"><b><span style="font-size:10pt;color:olive">Jeremy
McClanathan</span></b><span style="font-size:7.5pt;color:gray">,
LEED<sup>®</sup> AP</span></p>
<p class="MsoNormal"><b><span style="font-size:10pt;color:olive">CDi
ENGINEERS</span></b></p>
<p class="MsoNormal"><span style="font-size:7.5pt;color:gray">4200
194th St SW, Ste 200, Lynnwood, WA 98036</span></p>
<p class="MsoNormal"><span style="font-size:7.5pt;color:gray">P
425-672-1071 | F 425-778-8769 </span></p>
<p class="MsoNormal"><span style="font-size:13.5pt;font-family:Webdings;color:rgb(153, 204, 0)" lang="EN-GB">P</span><span style="font-family:Webdings;color:rgb(153, 204, 0)" lang="EN-GB">
</span><i><span style="font-size:7pt;color:rgb(153, 204, 0)" lang="EN-GB">Please consider the environment before printing this
email.</span></i></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)"> </span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)"> </span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)"> </span></p>
<div>
<div style="border-style:solid none none;border-color:rgb(181, 196, 223) -moz-use-text-color -moz-use-text-color;border-width:1pt medium medium;padding:3pt 0in 0in">
<p class="MsoNormal"><b><span style="font-size:10pt">From:</span></b><span style="font-size:10pt"> Li, Lan
[<a href="mailto:lli@sbmce.com" target="_blank">mailto:lli@sbmce.com</a>] <br>
<b>Sent:</b> Wednesday, May 26, 2010 8:49 AM<br>
<b>To:</b> Nick Caton; Tomlinson, Scott;
<a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Equest-users] eQuest - outside air heating issues</span></p>
</div>
</div>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Times New Roman","serif";color:blue">Nick,</span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Times New Roman","serif";color:blue"> </span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Times New Roman","serif";color:blue">In
my humble opinion, even system 3 or 4 won’t have same
amount of OA as your proposed system. For the base, each thermal zone
has its
own RTU; for proposed system, each thermal zone could be a VAV box. The
ventilation equation will play differently. The proposed large VAV
system will
have a larger diversity factor. I always put the same OA quan. at room
level. </span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Times New Roman","serif";color:blue"> </span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Times New Roman","serif";color:blue">Thanks!</span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Times New Roman","serif";color:blue"> </span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Times New Roman","serif";color:blue">Lan</span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Times New Roman","serif";color:blue"> </span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Times New Roman","serif";color:blue"> </span></p>
<div>
<div class="MsoNormal" style="text-align:center" align="center"><span style="font-size:12pt;font-family:"Times New Roman","serif"">
<hr align="center" size="3" width="100%"></span></div>
<p class="MsoNormal"><b><span style="font-size:10pt">From:</span></b><span style="font-size:10pt"> Nick
Caton
[<a href="mailto:ncaton@smithboucher.com" target="_blank">mailto:ncaton@smithboucher.com</a>] <br>
<b>Sent:</b> Wednesday, May 26, 2010 11:31 AM<br>
<b>To:</b> Tomlinson, Scott; <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Equest-users] eQuest - outside air heating issues</span></p>
</div>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)">Hey Scott,</span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)"> </span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)">To be
frank, I haven’t yet
modeled any LEED projects that would use systems 5+, so I have no
direct
experience to relate. That said, if I were in an omniscient USGBC
reviewer’s shoes, and you presented this method of matching ventilation
rates, I would check that the design OA rates for each floor are
roughly
matching the proposed values and design documents. The practice to
specify MIN-OA-RATIO’s at the system level to start, then tweaking as
necessary has (for me) turned out to be the most efficient way I’ve
found
of (1) getting the baseline quantities to start in the right vicinity
relative
to the proposed, and (2) maintain an equal distribution of the OA to
each zone.
As you point out, it’s on us to not bend the rules and redistribute
the OA in a way that is advantageous… </span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)"> </span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)">Off the
top of my head, I think
for baseline systems 5+, I would follow the same basic procedure, using
MIN-OA-RATIO’s from the proposed to get a starting point. For step
5, it may be appropriate to use a zonal method to specify/tweak the
resulting
ventilation rates to match, it would depend on the project-at-hand. On
the other hand, MIN-OA-RATIO may still be a viable option if the
modeler will
pay mind as you say to treat each floor/system separately and not to
simply
match the gross values for the building.</span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)"> </span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)">I have
not received any USGBC
commentary raising issues with this approach – as a simple disclaimer:
that’s not to say it has actually been scrutinized!</span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)"> </span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)">I’d love
to hear others
share their approaches if you have a “normal” procedure…
I’m sure there’s a variety out there and we might all learn
something =).</span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)"> </span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)">~Nick</span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)"> </span></p>
<div>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)"><img alt="cid:489575314@22072009-0ABB" height="37" width="119"></span></p>
<p class="MsoNormal"><b><span style="font-size:10pt;color:rgb(45, 77, 94)"> </span></b></p>
<p class="MsoNormal"><b><span style="font-size:10pt;color:rgb(45, 77, 94)">NICK
CATON, E.I.T.</span></b></p>
<p class="MsoNormal"><span style="font-size:7.5pt;color:rgb(204, 153, 0)">PROJECT ENGINEER</span></p>
<p class="MsoNormal"><span style="font-size:10pt;color:rgb(45, 77, 94)">25501 west
valley parkway</span></p>
<p class="MsoNormal"><span style="font-size:10pt;color:rgb(45, 77, 94)">olathe ks 66061</span></p>
<p class="MsoNormal"><span style="font-size:10pt;color:rgb(45, 77, 94)">direct 913
344.0036</span></p>
<p class="MsoNormal"><span style="font-size:10pt;color:rgb(45, 77, 94)">fax 913
345.0617</span></p>
<p class="MsoNormal"><i><span style="font-size:10pt;color:rgb(45, 77, 94)">Check out
our new web-site @ </span></i><span style="color:rgb(31, 73, 125)"><a href="http://www.smithboucher.com" title="blocked::www.smithboucher.com" target="_blank"><span style="font-size:10pt">www.smithboucher.com</span></a></span><u><span style="font-size:10pt;color:blue"> </span></u></p>
</div>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)"> </span></p>
<div>
<div style="border-style:solid none none;border-color:rgb(181, 196, 223) -moz-use-text-color -moz-use-text-color;border-width:1pt medium medium;padding:3pt 0in 0in">
<p class="MsoNormal"><b><span style="font-size:10pt">From:</span></b><span style="font-size:10pt">
Tomlinson, Scott
[<a href="mailto:stomlinson@smma.com" target="_blank">mailto:stomlinson@smma.com</a>] <br>
<b>Sent:</b> Wednesday, May 26, 2010 10:12 AM<br>
<b>To:</b> Nick Caton; <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> RE: [Equest-users] eQuest - outside air heating issues</span></p>
</div>
</div>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)">Nick,</span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)"> </span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)">First
off, thanks for the reply.</span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)"> </span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)">If I am
understanding you
correctly, your method is getting the total OA of each model to match
up, and
you are doing this at the system level for both the design and baseline
buildings. This differs from my method, where I am trying to get the
OA
rates to match up for each zone of the two models.</span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)"> </span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)">Your
method would seem to work
for a baseline system type 1, 2, 3 or 4, where each thermal block needs
to be
modeled as a separate system, but for a system 5, 6, 7 or 8 (where each
floor
of the baseline building needs to be modeled with a separate HVAC
system) I
would think you would have difficulty getting things to match up. When
you work on these higher system types, and you are modifying the OA
ratios of
your baseline systems, do you do it equally for all the systems? If
not,
I would think this could give you some freedom the ‘game’ your
baseline model in a way that USGBC would not approve of. I’m not
saying you personally would do this, let me use my current model as an
example.</span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)"> </span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)">My
current building is a 3 story
system 8 school. The design building has some AHUs (about 25% OA),
some
ERUs (100% OA) and some UHs (0% OA). Now, using my method of entering
the
OA at the zone level in the baseline building things are working out
that I
need energy recovery in the first floor HVAC system, but not the second
or third
floor systems. If I use your method of getting the total building OA
rates to match (and if I am understanding it correctly), what would
stop me
from taking some of the OA from the first floor system and transferring
it to
the second are third floor systems so I can get all three systems under
the
requirements for energy recovery, and provide myself some artificially
inflated
energy savings, while keeping my total building OA rates equal? In my
very limited feedback from USGBC it seems like they don’t like letting
the modeler have such freedoms.</span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)"> </span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)">Have you
ever had any issues
with USGBC using your method?</span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)"> </span></p>
<p><span style="color:rgb(31, 73, 125)"><span>-<span style="font-family:"Times New Roman";font-style:normal;font-variant:normal;font-weight:normal;font-size:7pt;line-height:normal;font-size-adjust:none;font-stretch:normal">
</span></span></span><span style="color:rgb(31, 73, 125)">Scott</span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)"> </span></p>
<div>
<div style="border-style:solid none none;border-color:rgb(181, 196, 223) -moz-use-text-color -moz-use-text-color;border-width:1pt medium medium;padding:3pt 0in 0in">
<p class="MsoNormal"><b><span style="font-size:10pt">From:</span></b><span style="font-size:10pt"> Nick
Caton
[<a href="mailto:ncaton@smithboucher.com" target="_blank">mailto:ncaton@smithboucher.com</a>] <br>
<b>Sent:</b> Wednesday, May 26, 2010 10:04 AM<br>
<b>To:</b> Tomlinson, Scott; <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> RE: [Equest-users] eQuest - outside air heating issues</span></p>
</div>
</div>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)">Scott, </span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)"> </span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)">I want to
say off the bat that
you actually are asking a very good and fundamental question: What is
a
“best practice” for matching baseline ventilation air rates to the
proposed model? </span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)"> </span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)">My
general processes is:</span></p>
<p><span style="color:rgb(31, 73, 125)"><span>1.<span style="font-family:"Times New Roman";font-style:normal;font-variant:normal;font-weight:normal;font-size:7pt;line-height:normal;font-size-adjust:none;font-stretch:normal">
</span></span></span><span style="color:rgb(31, 73, 125)">where I’ll
build a proposed model to match the drawings/schedules, address
anything that
results in odd results/ warnings / unmet hours.</span></p>
<p><span style="color:rgb(31, 73, 125)"><span>2.<span style="font-family:"Times New Roman";font-style:normal;font-variant:normal;font-weight:normal;font-size:7pt;line-height:normal;font-size-adjust:none;font-stretch:normal">
</span></span></span><span style="color:rgb(31, 73, 125)">Build the baseline
– clear out any zone/system level OA inputs to autosize, then </span></p>
<p><span style="color:rgb(31, 73, 125)"><span>3.<span style="font-family:"Times New Roman";font-style:normal;font-variant:normal;font-weight:normal;font-size:7pt;line-height:normal;font-size-adjust:none;font-stretch:normal">
</span></span></span><span style="color:rgb(31, 73, 125)">For each airside
system, enter the 1.15/1.25 oversizing parameters and a
“MIN-OA-RATIO” at the system level to match the corresponding
proposed design model’s system ratio</span></p>
<p><span style="color:rgb(31, 73, 125)"><span>4.<span style="font-family:"Times New Roman";font-style:normal;font-variant:normal;font-weight:normal;font-size:7pt;line-height:normal;font-size-adjust:none;font-stretch:normal">
</span></span></span><span style="color:rgb(31, 73, 125)">Run both simulations
and compare results for ventilation air to determine if things are way
off (and
they have been) – I use the SV-A reports and excel for this comparison</span></p>
<p><span style="color:rgb(31, 73, 125)"><span>5.<span style="font-family:"Times New Roman";font-style:normal;font-variant:normal;font-weight:normal;font-size:7pt;line-height:normal;font-size-adjust:none;font-stretch:normal">
</span></span></span><span style="color:rgb(31, 73, 125)">Tweak baseline
systems’ OA-RATIOs as required up or down to make the total ventilation
air sync with the proposed model’s. </span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)"> </span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)">Following
this procedure, which
I document for model review, the design system OA sums between the
baseline
model, proposed model, and construction documents are typically very
close to
each other, if not perfectly in sync.</span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)"> </span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)">Is this a
procedure others are
following or is there a simpler way?</span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)"> </span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)">To the
rest of your email…
Different systems will use different amounts/types of energy for the
same
amount of load (OA). Your baseline model’s tripling of gas
consumption isn’t something I’d immediately discount as unreasonable,
but worth reviewing to find something you may have missed – perhaps
lowering CFM’s are the culprit? In some cases, the core
“secret” to surprisingly outstanding proposed/baseline performance
is getting lucky with a terrible baseline… the prescriptive
requirements, by their nature, can be close to or far from “a good
idea” for any given project/site.</span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)"> </span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)">~Nick</span></p>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)"> </span></p>
<div>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)"><img alt="cid:489575314@22072009-0ABB" border="0" height="37" width="119"></span></p>
<p class="MsoNormal"><b><span style="font-size:10pt;color:rgb(45, 77, 94)"> </span></b></p>
<p class="MsoNormal"><b><span style="font-size:10pt;color:rgb(45, 77, 94)">NICK
CATON, E.I.T.</span></b></p>
<p class="MsoNormal"><span style="font-size:7.5pt;color:rgb(204, 153, 0)">PROJECT ENGINEER</span></p>
<p class="MsoNormal"><span style="font-size:10pt;color:rgb(45, 77, 94)">25501 west
valley parkway</span></p>
<p class="MsoNormal"><span style="font-size:10pt;color:rgb(45, 77, 94)">olathe ks 66061</span></p>
<p class="MsoNormal"><span style="font-size:10pt;color:rgb(45, 77, 94)">direct 913
344.0036</span></p>
<p class="MsoNormal"><span style="font-size:10pt;color:rgb(45, 77, 94)">fax 913
345.0617</span></p>
<p class="MsoNormal"><i><span style="font-size:10pt;color:rgb(45, 77, 94)">Check out
our new web-site @ </span></i><span style="color:rgb(31, 73, 125)"><a href="http://www.smithboucher.com" title="blocked::www.smithboucher.com" target="_blank"><span style="font-size:10pt">www.smithboucher.com</span></a></span><u><span style="font-size:10pt;color:blue"> </span></u></p>
</div>
<p class="MsoNormal"><span style="color:rgb(31, 73, 125)"> </span></p>
<div>
<div style="border-style:solid none none;border-color:rgb(181, 196, 223) -moz-use-text-color -moz-use-text-color;border-width:1pt medium medium;padding:3pt 0in 0in">
<p class="MsoNormal"><b><span style="font-size:10pt">From:</span></b><span style="font-size:10pt">
<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>
[<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">mailto:equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>Tomlinson,
Scott<br>
<b>Sent:</b> Wednesday, May 26, 2010 8:35 AM<br>
<b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] eQuest - outside air heating issues</span></p>
</div>
</div>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Hello all,</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I have a question regarding outside air input.
For my
design building I enter my outside air at the system level, as the
minimum
outside air ratio, which I get from my equipment schedules. 90.1
requires
that the outside airflow be the same. To do this I take my summary
report
from my design building and enter the values from that report into the
baseline
model zones. When I run my baseline model the outside airflow rates
from
the summary report match those of my design model, and my unmet heating
hours
are good in both models, but the heating gas consumption in my baseline
building
triples. The result is I am getting great, but unrealistic, energy
savings.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Does anyone know why this is happening? Why
would
entering the OA at the zone level cause such increased heating for the
save
total CFM entered at the system level? How are you folks typically
handling your outside ventilation air.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Any help would be greatly appreciated, thank you.</p>
<p class="MsoNormal"> </p>
<table border="0" cellpadding="0" cellspacing="3">
<tbody>
<tr>
<td colspan="3" style="padding:0in">
<p class="MsoNormal"><span style="font-size:10pt;color:silver">__________________________________________</span></p>
</td>
</tr>
<tr>
<td colspan="3" style="padding:0in">
<p class="MsoNormal"><b><span style="font-size:10pt;color:black">Scott Tomlinson,
PE, LEED-AP</span></b></p>
</td>
</tr>
<tr>
<td colspan="3" style="padding:0in">
<p class="MsoNormal"><span style="font-size:10pt;color:black">Mechanical</span></p>
</td>
</tr>
<tr>
<td colspan="3" style="padding:0in">
<p class="MsoNormal"><b><span style="font-size:10pt;color:rgb(0, 64, 64)">Symmes
Maini & McKee Associates, Inc.</span></b></p>
</td>
</tr>
<tr>
<td colspan="3" style="padding:0in">
<p class="MsoNormal"><span style="font-size:10pt;color:black">1000
Massachusetts Avenue, Cambridge, MA 02138</span></p>
</td>
</tr>
<tr>
<td style="padding:0in;width:131.25pt" nowrap width="175">
<p class="MsoNormal"><span style="font-size:10pt;color:black">t:
617.520.9438</span></p>
</td>
<td rowspan="4" style="padding:0in;width:75pt" nowrap width="100">
<p class="MsoNormal"><span style="font-size:12pt;font-family:"Times New Roman","serif""><img alt="http://intranet/Images/USGBC.jpg" border="0" height="64" width="63"></span></p>
</td>
<td rowspan="4" style="padding:0in;width:150pt" nowrap width="200">
<p class="MsoNormal"><span style="font-size:12pt;font-family:"Times New Roman","serif""> </span></p>
</td>
</tr>
<tr>
<td style="padding:0in">
<p class="MsoNormal"><span style="font-size:10pt;color:black">f:
617.354.5758</span></p>
</td>
</tr>
<tr>
<td style="padding:0in">
<p class="MsoNormal"><span style="font-size:10pt;color:black"><a href="mailto:STomlinson@smma.com" target="_blank">stomlinson@smma.com</a></span></p>
</td>
</tr>
<tr>
<td style="padding:0in">
<p class="MsoNormal"><span style="font-size:10pt;color:black"><a href="http://www.smma.com/" target="_blank">www.smma.com</a></span></p>
</td>
</tr>
</tbody>
</table>
<p class="MsoNormal"> </p>
<p class="MsoNormal"> </p>
</div>
<p><font size="1" color="#808080" face="Verdana">This email message, including any
attachments, is for the sole use of the intended recipient and may
contain confidential, proprietary, and/or privileged information, as
well as content subject to copyright and other intellectual laws. If
you are not the intended recipient, you may not disclose, use, copy, or
distribute the email message or its attachments. If you believe you
have received this email message in error, please contact the sender by
reply email, immediately delete this email and destroy copies.</font></p>
</div></div><pre>_______________________________________________
Equest-users mailing list
<a href="http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org" target="_blank">http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org</a>
To unsubscribe from this mailing list send a blank message to <a href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG" target="_blank">EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG</a>
</pre></blockquote>
</div>
<br>_______________________________________________<br>
Equest-users mailing list<br>
<a href="http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org" target="_blank">http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org</a><br>
To unsubscribe from this mailing list send a blank message to <a href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG">EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG</a><br>
<br></blockquote></div><br>