<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman,new york,times,serif;font-size:10pt">Keith:<br><br>It is my understanding that TMY2 is based on data from 1961 through 1990. TMY3 data is based on the data from 1991-2005, not 30 years.<br><br>Do you have different information?<br><br>If Siddharth is comparing a model using TMY2 v. TMY3, there will be a noticeable difference.<br><br>Paul Diglio<br><div><br></div><div style="font-family: times new roman,new york,times,serif; font-size: 10pt;"><br><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><font face="Tahoma" size="2"><hr size="1"><b><span style="font-weight: bold;">From:</span></b> Keith Swartz <kswartz@ecw.org><br><b><span style="font-weight: bold;">To:</span></b> Siddharth V <siddharth.v@tcs.com>; "equest-users@lists.onebuilding.org"
<equest-users@lists.onebuilding.org><br><b><span style="font-weight: bold;">Sent:</span></b> Tue, March 22, 2011 5:48:40 PM<br><b><span style="font-weight: bold;">Subject:</span></b> Re: [Equest-users] Internal manipulation of Weather data<br></font><br>
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--></style><div class="WordSection1"><p class="MsoNormal"><span style="font-size: 10pt; font-family: "sans-serif";">Siddharth,</span></p><p class="MsoNormal"><span style="font-size: 10pt; font-family: "sans-serif";"> </span></p><p class="MsoNormal"><span style="font-size: 10pt; font-family: "sans-serif";">Are you actually changing the weather file with data for those years, or are you changing the “analysis year” in the wizard? The TMY2 or TMY3 weather file uses data averaged from 30 years worth of data. Changing the analysis year will affect how weekends and holidays line up with the weather data for each day of the year.</span><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);"></span></p><p class="MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);"> </span></p><div><p class="MsoNormal"><span style="font-size: 10pt;
font-family: "sans-serif"; color: rgb(31, 73, 125);">________________________________</span><span style="color: rgb(31, 73, 125);"></span></p><p class="MsoNormal"><span style="font-size: 10pt; font-family: "sans-serif";"><span style="color: rgb(31, 73, 125);">Keith Swartz</span><span style="color: rgb(31, 73, 125);">, P.E., LEED AP</span></span><span style="color: rgb(31, 73, 125);"></span></p><p class="MsoNormal"><span style="font-size: 10pt; font-family: "sans-serif"; color: rgb(31, 73, 125);"><br>Energy Engineer / Senior Project Manager<br></span><b><span style="font-size: 10pt; font-family: "sans-serif";"><span style="color: rgb(31, 73, 125);">Energy</span><span style="color: rgb(31, 73, 125);"> </span><span style="color: rgb(31, 73, 125);">Center</span><span style="color: rgb(31, 73, 125);"> of </span><span style="color: rgb(31, 73, 125);">Wisconsin</span><span style="color: rgb(31, 73, 125); font-weight:
normal;"><br></span><span style="font-weight: normal;"></span></span></b><span style="font-size: 10pt; font-family: "sans-serif";"><span style="color: rgb(31, 73, 125);">455 Science Drive, Suite 200, </span></span><span style="font-size: 10pt; font-family: "sans-serif";"><span style="color: rgb(31, 73, 125);">Madison</span><span style="color: rgb(31, 73, 125);">, </span><span style="color: rgb(31, 73, 125);">WI</span><span style="color: rgb(31, 73, 125);"> </span><span style="color: rgb(31, 73, 125);">53711<br></span></span><span style="font-size: 10pt; font-family: "sans-serif"; color: rgb(31, 73, 125);">Phone: 608.238.8276 x123<br>Fax: 608.238.0523<br><br></span><b><span style="font-size: 10pt; font-family: "sans-serif"; color: rgb(31, 73, 125);">The Buildings Team</span></b><span style="color: rgb(31, 73, 125);"></span></p></div><div><p class="MsoNormal"><i><span style="font-size: 10pt; font-family:
"sans-serif"; color: rgb(31, 73, 125);">Design decisions through energy, economics and emissions analysis.</span></i><span style="color: rgb(31, 73, 125);"></span></p></div><div><p class="MsoNormal"><span style="font-size: 10pt; font-family: "sans-serif"; color: rgb(31, 73, 125);"><a rel="nofollow" target="_blank" href="http://www.ecw.org/Buildings">www.ecw.org/Buildings</a> </span></p></div><p class="MsoNormal"><span style="color: rgb(31, 73, 125);"><br></span><b><span style="font-size: 10pt; font-family: "sans-serif";"><span style="color: rgb(31, 73, 125);">Energy</span><span style="color: rgb(31, 73, 125);"> </span><span style="color: rgb(31, 73, 125);">Center</span><span style="color: rgb(31, 73, 125);"> </span><span style="color: rgb(31, 73, 125);">University<br></span></span></b><i><span style="font-size: 10pt; font-family: "sans-serif"; color: rgb(31, 73, 125);">Your gateway to sustainable design training
and online education programs.<br></span></i><span style="color: rgb(31, 73, 125);"><a rel="nofollow" target="_blank" href="http://www.ecw.org/university/" title="http://www.ecw.org/university/"><span style="font-size: 10pt; font-family: "sans-serif";">www.ecw.org/university/</span></a></span><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);"></span></p><div style="border-width: 1pt medium medium; border-style: solid none none; border-color: rgb(181, 196, 223) -moz-use-text-color -moz-use-text-color; padding: 3pt 0in 0in;"><p class="MsoNormal"><b><span style="font-size: 10pt; font-family: "sans-serif";">From:</span></b><span style="font-size: 10pt; font-family: "sans-serif";"> Siddharth V [mailto:siddharth.v@tcs.com] <br><b>Sent:</b> Tuesday, March 22, 2011 5:42 AM<br><b>To:</b> equest-users@lists.onebuilding.org<br><b>Subject:</b> [Equest-users] Internal manipulation of Weather
data</span></p></div><p class="MsoNormal"> </p><p class="MsoNormal"><br><span style="font-size: 10pt; font-family: "sans-serif";">Hi All, </span><br><br><span style="font-size: 10pt; font-family: "sans-serif";">I have observed 3% difference in the energy consumption for a given location while specifying two different years (2010 and 2011). How does eQUEST (or any energy simulation s/w) internally extrapolates the weather data based on the specified year?</span> <br><br><span style="font-size: 10pt; font-family: "sans-serif";">I feel 3% difference in energy is very significant. Any guidelines on selection of TMY (typical meteorological year) ?</span> <br><br><span style="font-size: 10pt; font-family: "sans-serif";">Thanks in advance!</span> <br><br><br><span style="font-size: 10pt; font-family: "sans-serif";">Regards,<br>Siddharth Venkataraman<br>Tata Consultancy Services<br>Mailto:
siddharth.v@tcs.com<br>Website: </span><a rel="nofollow" target="_blank" href="http://www.tcs.com/"><span style="font-size: 10pt; font-family: "sans-serif";">http://www.tcs.com</span></a><span style="font-size: 10pt; font-family: "sans-serif";"><br>____________________________________________<br>Experience certainty. IT Services<br> Business Solutions<br> Outsourcing<br>____________________________________________</span></p><pre style="margin-bottom: 12pt;">=====-----=====-----=====<br>Notice: The information contained in this e-mail<br>message and/or attachments to it may contain <br>confidential or privileged information. If you are <br>not the intended recipient, any dissemination, use, <br>review, distribution, printing or copying of the
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