<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>
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</b></font><p style="margin:0in 0in 0pt"></p><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">
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<br><br><div class="gmail_quote">On Wed, Feb 12, 2014 at 7:57 AM, David Eldridge <span dir="ltr"><<a 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">
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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?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></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.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></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.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></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.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">David<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></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"><u></u><u></u></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"><u></u><u></u></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"><u></u><u></u></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"><u></u><u></u></span></p>
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</span></u><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u><u></u></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"><u></u><u></u></span></p>
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<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 href="mailto:yjhuang@whiteboxtechnologies.com" target="_blank">yjhuang@whiteboxtechnologies.com</a>]
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<b>Sent:</b> Tuesday, February 11, 2014 2:43 PM<br>
<b>To:</b> Arunabha Sau; David Eldridge; <a 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<u></u><u></u></span></p>
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<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
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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.
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What is pre-RCx ? "pre retro-commissioning"? What is that? Too many adjectives for me :-)
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In any case, if you're modeling an existing building to assess its historical performance, I would definitely use actual year weather files.
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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.
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Joe<br>
Joe Huang <br>
White Box Technologies, Inc.<br>
346 Rheem Blvd., Suite 108D<br>
Moraga CA 94556<br>
<a href="mailto:yjhuang@whiteboxtechnologies.com" target="_blank">yjhuang@whiteboxtechnologies.com</a><br>
<a href="http://weather.whiteboxtechnologies.com" target="_blank">http://weather.whiteboxtechnologies.com</a> for simulation-ready weather data<br>
<a href="http://www.whiteboxtechnologies.com" target="_blank">http://www.whiteboxtechnologies.com</a><br>
(o) <a href="tel:%28925%29388-0265" value="+19253880265" target="_blank">(925)388-0265</a><br>
(c) <a 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:<u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Tahoma","sans-serif";color:#000066">Thanks Joe & David. <u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-family:"Tahoma","sans-serif";color:#000066">Appreciate your explanation. It was very through.<u></u><u></u></span></p>
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<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.<u></u><u></u></span></p>
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<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?<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-family:"Tahoma","sans-serif";color:#000066"><u></u> <u></u></span></p>
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<p class="MsoNormal"><span style="font-family:"Tahoma","sans-serif";color:#000066">Best regards,<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-family:"Tahoma","sans-serif";color:#000066">Aru<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-family:"Tahoma","sans-serif";color:#000066"><u></u> <u></u></span></p>
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<p class="MsoNormal"><i><span style="font-family:"Georgia","serif";color:#000066">~~~</span></i><span style="font-family:"Tahoma","sans-serif";color:#000066"><u></u><u></u></span></p>
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<p class="MsoNormal"><i><span style="font-size:7.5pt;font-family:"Georgia","serif";color:#000066">Texas Aggie '10</span></i>
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<p class="MsoNormal"><i><span style="font-size:7.5pt;font-family:"Georgia","serif";color:#000066">JU, Kolkata '05</span></i><u></u><u></u></p>
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<p class="MsoNormal"><i><span style="font-size:7.5pt;font-family:"Georgia","serif"">~~~</span></i><u></u><u></u></p>
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<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><u></u><u></u></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:7.5pt;font-family:"Arial","sans-serif";color:red">- Albert Einstein </span><u></u><u></u></p>
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