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I communicated with CDS about this a couple of months ago. It's a
royal pain in the @#$ to do this! What you have to do is go to the
rooms and manually enter the CFM for each room such that it totals
up to the desired CFM at the system level. This means you have to
first figure out which rooms are assigned to each system then figure
out how much to change each room CFM such that it totals to what you
want then print out the calculated room CFM values. Not easy if you
have hundreds of rooms. I wound up putting it all in Excel so I
could figure out a room CFM multiplier that changed each room CFM by
the percentage needed. It took me a half day to mess with this and
is a major deficiency in the Trace software IMHO.<br>
<br>
Regards,<br>
<br>
Craig J. Gann, P.E.; LEED AP<br>
<br>
<div class="moz-cite-prefix">On 10/7/2014 11:18 AM, Scott Parker
wrote:<br>
</div>
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<div class="WordSection1">
<p class="MsoNormal"><span style="color:#1F497D">I agree that
the proposed system model should have the same capacity as
the actual equipment. However, the challenge is that when
you fix the leaving air temperature of the air handler
(which matches typical design) then Trace does not allow any
method for fixing the air handler CFM capacity.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><u><span style="color:#1F497D">For
example, below I have just listed some numbers for
reference to illustrate the point:<o:p></o:p></span></u></b></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Sum of Peaks =
19,458 CFM<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Block load =
18,902 CFM (actual maximum hourly airflow in Trace will
typically be even less than this value)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">AHU size =
20,000 CFM (scheduled on plans)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">AHU size in
trace = block load (18,902 CFM) – no way to force it to be
20,000 CFM.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Therefore, when
the air handler (in Trace) is at 18,902 CFM it is at peak
fan power (i.e. top of fan curve). However, it actually is
already part way down the true fan curve since the unit is
scheduled for 20,000 CFM. If you use the theoretical fan
laws, then the fan power at 18,902 CFM is 84% of the
scheduled break horsepower - (18,902/20,000)^3 = 0.84 --
even though the fan is operating at 94.5% of peak fan power.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">If anyone has a
work around for this I would like to hear it. For me I have
had to manually change the kW/CFM value to match the actual
scheduled fan at the block airflow calculated in Trace.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<table class="MsoNormalTable" style="width:355.5pt"
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<td style="width:125.25pt;padding:.75pt .75pt .75pt
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<p class="MsoNormal" style="line-height:105%"><b><span
style="font-size:10.0pt;line-height:105%;color:#660000;text-transform:uppercase">Scott
Parker</span></b><span
style="font-size:9.0pt;line-height:105%;color:#333333">
PE<br>
LEED AP BD+C <br>
</span><span
style="font-size:10.0pt;line-height:105%;color:black;text-transform:uppercase">Mechanical</span><span
style="font-size:9.0pt;line-height:105%;font-family:"Times
New Roman","serif";color:#333333"><o:p></o:p></span></p>
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valign="top" width="10">
<p class="MsoNormal" style="line-height:105%"><span
style="font-size:9.0pt;line-height:105%;color:#333333"> <o:p></o:p></span></p>
</td>
<td style="width:212.25pt;padding:.75pt .75pt .75pt
.75pt" valign="top" width="283">
<p class="MsoNormal" style="line-height:105%"><b><span
style="font-size:9.0pt;line-height:105%;color:#660000">AEI</span></b><span
style="font-size:9.0pt;line-height:105%;color:#333333"> | AFFILIATED
ENGINEERS, INC. <br>
1414 Raleigh Road, Suite 305 | Chapel Hill, NC
27517<br>
<br>
</span><span
style="font-size:9.0pt;line-height:105%;color:#660000">P:
919.419.9802 | F: 919.419.9803</span><span
style="font-size:9.0pt;line-height:105%;color:#333333"> <br>
</span><span
style="font-size:12.0pt;line-height:105%;font-family:"Times
New Roman","serif";color:#1F497D"><a
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href="mailto:sparker@aeieng.com"><span
style="font-size:9.0pt;line-height:105%;font-family:"Calibri","sans-serif";color:#660000;text-decoration:none">sparker@aeieng.com</span></a></span><span
style="font-size:9.0pt;line-height:105%;color:#660000"> | </span><span
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<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
</div>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> Trace-users
[<a class="moz-txt-link-freetext" href="mailto:trace-users-bounces@lists.onebuilding.org">mailto:trace-users-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>Steve Jacobs<br>
<b>Sent:</b> Tuesday, October 07, 2014 11:13 AM<br>
<b>To:</b> 'Caballero, Catalina';
<a class="moz-txt-link-abbreviated" href="mailto:trace-users@lists.onebuilding.org">trace-users@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Trace-users] Load Calcs vs Energy
Model for LEED<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Your proposed
inputs need to match what is actually being installed in the
building. If they are installing oversized equipment, you
need to model oversized equipment. The model will account
for part load efficiencies.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo2"><!--[if !supportLists]--><span
style="color:#1F497D"><span style="mso-list:Ignore">-<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span
style="color:#1F497D">Steve<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
Trace-users [<a moz-do-not-send="true"
href="mailto:trace-users-bounces@lists.onebuilding.org">mailto:trace-users-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>Caballero, Catalina<br>
<b>Sent:</b> Tuesday, October 7, 2014 9:04 AM<br>
<b>To:</b> <a moz-do-not-send="true"
href="mailto:trace-users@lists.onebuilding.org">trace-users@lists.onebuilding.org</a><br>
<b>Subject:</b> [Trace-users] Load Calcs vs Energy Model
for LEED<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hello experts,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We <span style="font-size:10.0pt">recently
received comments back from LEED and one of the comments
says the following:
<o:p></o:p></span></p>
<p class="MsoNormal"><i><span style="font-size:10.0pt"><o:p> </o:p></span></i></p>
<p class="MsoNormal" style="text-autospace:none"><i><span
style="font-size:10.0pt;color:#444444">It appears the
equipment capacities (fan volume, fan power, cooling
capacity, etc.) for the HVAC systems in the Proposed model<o:p></o:p></span></i></p>
<p class="MsoNormal" style="text-autospace:none"><i><span
style="font-size:10.0pt;color:#444444">are inconsistent
with the equipment capacities in the actual design when
comparing the LEED Energy Performance Summary Report<o:p></o:p></span></i></p>
<p class="MsoNormal" style="text-autospace:none"><i><span
style="font-size:10.0pt;color:#444444">to the mechanical
schedules provided for PIf4: Schedule and Overview
Documents<o:p></o:p></span></i></p>
<p class="MsoNormal" style="text-autospace:none"><i><span
style="font-size:10.0pt;color:#444444">G3.1.10 in the
Proposed building column requires that the Proposed model
reflect all HVAC systems at actual equipment capacities<o:p></o:p></span></i></p>
<p class="MsoNormal" style="text-autospace:none"><i><span
style="font-size:10.0pt;color:#444444">and efficiencies.
The HVAC equipment capacities cannot be autosized in the
Proposed model. Revise the Proposed model to reflect<o:p></o:p></span></i></p>
<p class="MsoNormal" style="text-autospace:none"><i><span
style="font-size:10.0pt;color:#444444">all HVAC systems at
actual equipment capacities. In addition, update Table
1.4.7B, and provide a revised LEED Energy Performance<o:p></o:p></span></i></p>
<p class="MsoNormal" style="text-autospace:none"><i><span
style="font-size:10.0pt;color:#444444">Summary Report and
the System Enterd Values reports for the Proposed model
reflecting the changes. Further, if the equipment<o:p></o:p></span></i></p>
<p class="MsoNormal" style="text-autospace:none"><i><span
style="font-size:10.0pt;color:#444444">capacities and
efficiencies are based on updated mechanical schedules
and/or HVAC submittal sheets, provide the updated<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span
style="font-size:10.0pt;color:#444444">mechanical
schedules and/or HVAC submittal sheets.<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span
style="font-size:10.0pt;color:#444444"><o:p> </o:p></span></i></p>
<p class="MsoNormal"><span style="color:red">The only question
that I have is why would they require for the airflows, to
be exactly the same, to the original load calculations when
the load calculations looks for the worst case scenario
(using ashrae basic envelope, lighting, values), while the
energy model looks for the most energy efficient model
(actual installed envelope, occupancy, etc). It make sense
that they are looking for something similar but it’s
definitely not going to match the capacities and or
airflows, (load calcs tend to be oversized).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:red"><o:p> </o:p></span></p>
<p class="MsoNormal">I would greatly appreciate your opinion.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks.<i><span style="font-size:18.0pt"><o:p></o:p></span></i></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="text-autospace:none"><b><span
style="font-size:9.0pt;font-family:"Century
Gothic","sans-serif";color:black">Catalina
Caballero</span></b><span
style="font-size:9.0pt;font-family:"Century
Gothic","sans-serif";color:black">. AIA.
Assoc., LEED GA.<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><i><span
style="font-size:9.0pt;font-family:"Century
Gothic","sans-serif";color:black">Sustainability
Coordinator<o:p></o:p></span></i></p>
<p class="MsoNormal" style="text-autospace:none"><i><span
style="font-size:9.0pt;font-family:"Century
Gothic","sans-serif";color:gray"><o:p> </o:p></span></i></p>
<p class="MsoNormal" style="text-autospace:none"><b><span
style="font-size:9.0pt;font-family:"Century
Gothic","sans-serif";color:black">Johnson,
Avedano, Lopez, Rodriguez & Walewski Engineering
Group, Inc.<o:p></o:p></span></b></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.0pt;font-family:"Century
Gothic","sans-serif";color:#00B050">Engineering
for High Performance Buildings.<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><i><span
style="font-size:9.0pt;font-family:"Century
Gothic","sans-serif";color:black">MEPF -
BIM - LEED - Cx<o:p></o:p></span></i></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.0pt;font-family:"Century
Gothic","sans-serif";color:black"><br>
2510 NW 97 Ave, Ste 220, Miami, FL 33172.<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><b><span
style="font-size:9.0pt;font-family:"Century
Gothic","sans-serif";color:black">P:</span></b><span
style="font-size:9.0pt;font-family:"Century
Gothic","sans-serif";color:black">
305.594.0660</span><span
style="font-size:9.0pt;font-family:"Century
Gothic","sans-serif";color:#17365D">
</span><span style="font-size:9.0pt;font-family:"Century
Gothic","sans-serif";color:black"> <b>Ext:</b>
217
</span><span style="font-size:9.0pt;color:black">Ӏ</span><span
style="font-size:9.0pt;font-family:"Century
Gothic","sans-serif";color:black">
<b>F: </b>305.594.0907 <o:p></o:p></span></p>
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style="font-size:9.0pt;font-family:"Century
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</span><span style="font-size:9.0pt;font-family:"Century
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