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<div class="moz-cite-prefix">Aru,<br>
<br>
Your multiple mention of the EPW Indian weather files all being
from 1990 finally stirred me to do some digging, since I've been
providing technical<br>
assistance to ISHRAE since 2007, first in improving the solar on
the first set of files for 58 Indian locations developed by ISHRAE
, and then in creating a totally new second set of files for 38
locations completed in 2011. <br>
<br>
I have checked the first set of ISHRAE weather files for 58
locations in India (these are the ones provided by ISHRAE to DOE
to put on the EnergyPlus Weather web site as EPWs), and yes those
all say 1990s for all months. However, the documentation dated
Sept. 1998 states that the raw data contain from 5 to 10 years of
historical data. So, it may very well be that these files may
actually contain months from different years, but I can't vouch
for that since that was done before my involvement.<br>
<br>
I do have a good memory on the second set of weather files, since
I was involved in their creation. Those are definitely "typical
year" files created from 15 years of data when available, but in a
few cases I settled for as few as 3 due to data scarcity. The key
point in the second set is that I calculated the solar radiation
against satellite-derived solar values that just became available
in 2010. The final files were provided to ISHRAE in early 2011,
but I have no information on their distribution or availability,
which is completely in their hands. If you're interested, I can
provide you with a contact person at ISHRAE.<br>
<br>
Joe<br>
<br>
Joe Huang <br>
White Box Technologies, Inc.<br>
346 Rheem Blvd., Suite 108D<br>
Moraga CA 94556<br>
<a class="moz-txt-link-abbreviated" href="mailto:yjhuang@whiteboxtechnologies.com">yjhuang@whiteboxtechnologies.com</a><br>
<a class="moz-txt-link-freetext" href="http://weather.whiteboxtechnologies.com">http://weather.whiteboxtechnologies.com</a> for simulation-ready
weather data<br>
<a class="moz-txt-link-freetext" 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 6:42 PM, Arunabha Sau wrote:<br>
</div>
<blockquote
cite="mid:CAALKp7TEPVBf-agPhNSng865weOmqQ4EFWcWO_N1H+2GB1htmg@mail.gmail.com"
type="cite">
<div dir="ltr">
<div class="gmail_default"
style="font-family:tahoma,sans-serif;color:rgb(0,0,102)">Yea,
David. Joe is just making the state-of-art weather files thru'
ASHRAE research projects but he is not performing any
"p-RCx"!! :)</div>
<div class="gmail_default"
style="font-family:tahoma,sans-serif;color:rgb(0,0,102)"><br>
</div>
<div class="gmail_default"
style="font-family:tahoma,sans-serif;color:rgb(0,0,102)">Thanks
David. Appreciate the reply.The EPW Indian weather files
typically from 1990s. It's typical year weather file. But I
don't think I should use this old weather file in Cx model. My
project is a fairly simple model with few simple EEMs -
efficient chiller and air side economizer.</div>
<div class="gmail_default"
style="font-family:tahoma,sans-serif;color:rgb(0,0,102)">Of
course I can calibrate the model to the current energy usage.
Do you think using the 1990 weather file would be good way?</div>
<div class="gmail_default"
style="font-family:tahoma,sans-serif;color:rgb(0,0,102)">
<br>
</div>
<div class="gmail_default"
style="font-family:tahoma,sans-serif;color:rgb(0,0,102)">Cheers!</div>
<div class="gmail_default"
style="font-family:tahoma,sans-serif;color:rgb(0,0,102)">Aru</div>
</div>
<div class="gmail_extra">
<br clear="all">
<div>
<div><font color="#000066" face="Georgia, serif"><i>~~~</i></font></div>
<span
style="font-family:arial,sans-serif;border-collapse:collapse"><i><font
color="#000066" size="1"><span
style="font-family:Georgia,serif">Texas</span><span
style="font-family:Georgia,serif"> </span><span
style="font-family:Georgia,serif">Aggie '10</span></font></i></span>
<div>
<span
style="font-family:arial,sans-serif;border-collapse:collapse"><span><span
style="font-family:Georgia,serif"><i><font
color="#000066" size="1">JU, Kolkata '05</font></i></span></span></span></div>
<div><span
style="font-family:arial,sans-serif;border-collapse:collapse"><span><span
style="color:black;font-family:Georgia,serif"><i><font
size="1">~~~</font></i></span></span></span></div>
<div><span style="border-collapse:collapse"><span
style="background-color:rgb(255,255,255)"><font
color="#ff0000" face="Arial, sans-serif" size="1"><b>
</b></font>
<p
style="color:rgb(31,73,125);font-family:Calibri,sans-serif;margin:0in
0in 0pt"><span
style="color:red;font-family:Arial,sans-serif"><font
size="1"><strong> </strong><strong> </strong></font></span></p>
<font color="#ff0000" face="Arial, sans-serif" size="1"><b>
</b></font>
<p style="margin:0in 0in 0pt"><font color="#ff0000"
face="Arial, sans-serif" size="1"><i>Try not to
become a man of success, but rather try to become
a man of value.</i><b> </b></font></p>
<p style="margin:0in 0in 0pt"><font size="1"><font
color="#ff0000" face="Arial, sans-serif">- </font><span
style="color:rgb(255,0,0);font-family:Arial,sans-serif">Albert Einstein </span></font></p>
<div
style="color:rgb(31,73,125);font-family:Calibri,sans-serif;font-size:15px"><br>
</div>
</span></span></div>
</div>
<br>
<br>
<div class="gmail_quote">On Wed, Feb 12, 2014 at 7:57 AM, David
Eldridge <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:DEldridge@grummanbutkus.com" target="_blank">DEldridge@grummanbutkus.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="white" link="blue" vlink="purple" lang="EN-US">
<div>
<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?</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </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.</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </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.</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </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.</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">David</span></p>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </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"></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"></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"></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"></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"></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"></span></p>
</div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </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";color:windowtext">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">
Joe Huang [mailto:<a moz-do-not-send="true"
href="mailto:yjhuang@whiteboxtechnologies.com"
target="_blank">yjhuang@whiteboxtechnologies.com</a>]
<br>
<b>Sent:</b> Tuesday, February 11, 2014 2:43 PM<br>
<b>To:</b> Arunabha Sau; David Eldridge; <a
moz-do-not-send="true"
href="mailto:equest-users@lists.onebuilding.org"
target="_blank">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: Fwd: Composition of weather
file data</span></p>
</div>
</div>
<div>
<div class="h5">
<p class="MsoNormal"> </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"
target="_blank">yjhuang@whiteboxtechnologies.com</a><br>
<a moz-do-not-send="true"
href="http://weather.whiteboxtechnologies.com"
target="_blank">http://weather.whiteboxtechnologies.com</a>
for simulation-ready weather data<br>
<a moz-do-not-send="true"
href="http://www.whiteboxtechnologies.com"
target="_blank">http://www.whiteboxtechnologies.com</a><br>
(o) <a moz-do-not-send="true"
href="tel:%28925%29388-0265"
value="+19253880265" target="_blank">(925)388-0265</a><br>
(c) <a moz-do-not-send="true"
href="tel:%28510%29928-2683"
value="+15109282683" target="_blank">(510)928-2683</a><br>
"building energy simulations at your fingertips"<br>
<br>
<br>
On 2/11/2014 4:09 AM, Arunabha Sau wrote:</p>
</div>
<blockquote
style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div>
<p class="MsoNormal"><span
style="font-family:"Tahoma","sans-serif";color:#000066">Thanks
Joe & David. </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.</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.</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?</span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Tahoma","sans-serif";color:#000066"> </span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Tahoma","sans-serif";color:#000066">Best
regards,</span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Tahoma","sans-serif";color:#000066">Aru</span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Tahoma","sans-serif";color:#000066"> </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"></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>
</p>
<div>
<p class="MsoNormal"><i><span
style="font-size:7.5pt;font-family:"Georgia","serif";color:#000066">JU,
Kolkata '05</span></i></p>
</div>
<div>
<p class="MsoNormal"><i><span
style="font-size:7.5pt;font-family:"Georgia","serif"">~~~</span></i></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></p>
<p
style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:7.5pt;font-family:"Arial","sans-serif";color:red">- Albert
Einstein </span></p>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<p class="MsoNormal"> </p>
</div>
</div>
</div>
</div>
</blockquote>
</div>
<br>
</div>
</blockquote>
<br>
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