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<div class="moz-cite-prefix">David, no, can't you tell :-)<br>
<br>
Could you explain to me in simple layman's terms what is "pre
retro-commissioning" ? I know what's commissioning, and even have
a good idea what's "retro-commissioning", but "pre
retro-commissioning" ? Is that like preparing to get ready to do
something ? <br>
<br>
Joe<br>
<br>
<br>
On 2/11/2014 6:27 PM, David Eldridge wrote:<br>
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<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Joe,
you aren’t performing “p-RCx energy models” very often?<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">But
seriously Arunabha, the magnitude of RCx savings for a
facility may not be a high percentage of the total usage –
although the measures are low-cost and quick payback –
energy modeling used as part of RCx should try to use actual
weather data if possible or else the variances due to
weather might be the same magnitude as the RCMs if you are
attempting any significant level of calibration for the
model.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">However
you should then run the proposed case with typical weather
in order to model an “expected” annual savings.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Depending
what measures you are modeling and whether you have any
calibration data during the “p-RCx” phase, typical weather
could work well enough, at least to get started and see if
you should continue using the model for this purpose.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">David<o:p></o:p></span></p>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><u><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif"">
</span></u><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Calibri","sans-serif""> </span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">David
S. Eldridge, Jr., P.E., LEED AP BD+C, BEMP, BEAP, HBDP</span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#244061">Grumman/Butkus
Associates</span></b><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><u><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif"">
</span></u><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">
Joe Huang [<a class="moz-txt-link-freetext" href="mailto:yjhuang@whiteboxtechnologies.com">mailto:yjhuang@whiteboxtechnologies.com</a>]
<br>
<b>Sent:</b> Tuesday, February 11, 2014 2:43 PM<br>
<b>To:</b> Arunabha Sau; David Eldridge;
<a class="moz-txt-link-abbreviated" href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: Fwd: Composition of weather file
data<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">It's inevitable that the peak conditions
will fluctuate from year to year, that's just the chaotic
nature of the weather. If you
<br>
use a "typical year" weather file, you will tend to get, but
not necessarily, an average annual peak, since the months
have been selected to best match the long-term distribution
of temperatures, humidity, solar, wind speed, etc.
<br>
<br>
What is pre-RCx ? "pre retro-commissioning"? What is
that? Too many adjectives for me :-)
<br>
<br>
In any case, if you're modeling an existing building to
assess its historical performance, I would definitely use
actual year weather files.
<br>
As for where to find such data, there's a proliferation of
sources on the Web, although most would require processing
to turn them into formats required by simulation programs
such as eQUEST, etc.
<br>
<br>
Joe<br>
Joe Huang <br>
White Box Technologies, Inc.<br>
346 Rheem Blvd., Suite 108D<br>
Moraga CA 94556<br>
<a moz-do-not-send="true"
href="mailto:yjhuang@whiteboxtechnologies.com">yjhuang@whiteboxtechnologies.com</a><br>
<a moz-do-not-send="true"
href="http://weather.whiteboxtechnologies.com">http://weather.whiteboxtechnologies.com</a>
for simulation-ready weather data<br>
<a moz-do-not-send="true"
href="http://www.whiteboxtechnologies.com">http://www.whiteboxtechnologies.com</a><br>
(o) (925)388-0265<br>
(c) (510)928-2683<br>
"building energy simulations at your fingertips"<br>
<br>
<br>
On 2/11/2014 4:09 AM, Arunabha Sau wrote:<o:p></o:p></p>
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<div>
<p class="MsoNormal"><span
style="font-family:"Tahoma","sans-serif";color:#000066">Thanks
Joe & David. <o:p></o:p></span></p>
</div>
<div>
<div>
<div>
<p class="MsoNormal"><span
style="font-family:"Tahoma","sans-serif";color:#000066">Appreciate
your explanation. It was very through.<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Tahoma","sans-serif";color:#000066">In
an EPW file, I saw only 1990's data, so I was
worried about the peak if the typical years's data
would be different or so! I was modeling for
pre-RCx. So, I was more concerned about actual (or
near to actual) heating/cooling load.<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Tahoma","sans-serif";color:#000066">For
Cx modeling, do you guys make model out of these
weather file or make a more customized weather
file from some online available weather file
source or buy one?<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Tahoma","sans-serif";color:#000066"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Tahoma","sans-serif";color:#000066">Best
regards,<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Tahoma","sans-serif";color:#000066">Aru<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Tahoma","sans-serif";color:#000066"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><i><span
style="font-family:"Georgia","serif";color:#000066">~~~</span></i><span
style="font-family:"Tahoma","sans-serif";color:#000066"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><i><span
style="font-size:7.5pt;font-family:"Georgia","serif";color:#000066">Texas Aggie
'10</span></i>
<o:p></o:p></p>
<div>
<p class="MsoNormal"><i><span
style="font-size:7.5pt;font-family:"Georgia","serif";color:#000066">JU,
Kolkata '05</span></i><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><i><span
style="font-size:7.5pt;font-family:"Georgia","serif"">~~~</span></i><o:p></o:p></p>
</div>
<div>
<p style="margin:0in;margin-bottom:.0001pt"><i><span
style="font-size:7.5pt;font-family:"Arial","sans-serif";color:red">Try
not to become a man of success, but rather try
to become a man of value.</span></i><b><span
style="font-size:7.5pt;font-family:"Arial","sans-serif";color:red"> </span></b><o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:7.5pt;font-family:"Arial","sans-serif";color:red">- Albert
Einstein </span><o:p></o:p></p>
</div>
</div>
</div>
</div>
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</blockquote>
<p class="MsoNormal"><o:p> </o:p></p>
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