<div dir="ltr">This just happens. None of these models or model versions are "100% accurate" for estimating consumption. They will vary from version to version in ASHRAE 140 tests. I'd like to see that different versions of mature software stay within 5% on each end use, but that's all I'd expect. For example, check out some Trane Trace results:<div><a href="https://www.trane.com/content/dam/Trane/Commercial/global/products-systems/design-analysis-tools/analysis-tools/trace-700/ASHRAE%20140-2007%20Results%20-%20v63.pdf">https://www.trane.com/content/dam/Trane/Commercial/global/products-systems/design-analysis-tools/analysis-tools/trace-700/ASHRAE%20140-2007%20Results%20-%20v63.pdf</a></div><div><br></div><div>They are 10-20% different than the mean of the comparison suite on a bunch of different test cases. Is that a problem? Not necessarily. <br><div><div><br></div><div>Simulation is useful for estimating differences in consumption much more so than actual consumption. If you can pin one end or one point through calibration of some kind, then your actual savings estimates mean something. Likewise, if you are just using a model to say whether design change A or design change B uses less energy, then the model can give you that kind of decision-making data input. </div></div></div><div><br></div><div>My advice, which I think is typical practice, is to keep the same software version for all runs of a given building, even if you go back to it 3 or 4 years later. </div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Jan 28, 2016 at 7:40 AM, Veronica Ochoa <span dir="ltr"><<a href="mailto:veronica.ochoa@hurleypalmerflatt.com" target="_blank">veronica.ochoa@hurleypalmerflatt.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="EN-GB" link="blue" vlink="purple"><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif"">Hi all,<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif""><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif"">Is anyone aware of any bugs in eQuest that modify specifically the space cooling energy results? A LEED model was originally produced in version 3.64 build 7130, and when I run it in my later 3.65 build 7154 (without making any changes) version the space cooling increases from 60,000 kWh to 2,300,000 kWh! Note the heat pump supplementary variable also changes, but not by 3,000%.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif""><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif"">I noticed that in the PS-H report my chillers are working (in the later version) and in the previous version they are all in 0s. Note nothing was changed, just re-ran in different versions. <u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif""><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif"">I have searched, but haven’t found any bugs related to these specific versions. Any thoughts would be much appreciated. <u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif""><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif"">Thanks in advance,<u></u><u></u></span></p></div><table border="0" cellspacing="0" cellpadding="0" width="600"><colgroup><col><col></colgroup><tbody><tr><td rowspan="6" width="170"><p style="FONT-FAMILY:Arial"><img alt="HPFLogo" src="http://extranet.hurleypalmerflatt.com/signature/HPF_2015_Logo_Square.png" width="170" height="104"></p></td><td width="430"><p style="FONT-FAMILY:Arial"><span style="FONT-SIZE:9pt"><strong><span style="color:#0099cc">Veronica Ochoa</span></strong><span style="COLOR:#012169"> <span style="COLOR:#12236b">| Consultant</span></span></span></p></td></tr><tr style="COLOR:#012169"><td><p style="FONT-FAMILY:Arial"><span style="FONT-SIZE:9pt"><strong>d</strong> <a href="tel:%2B44%2020%207535%203750" value="+442075353750" target="_blank">+44 20 7535 3750</a></span></p></td></tr><tr style="COLOR:#012169"><td><p style="FONT-FAMILY:Arial"><span style="FONT-SIZE:9pt"><strong>t</strong> <a href="tel:%2B44%2020%207535%203100" value="+442075353100" target="_blank">+44 20 7535 3100</a></span></p></td></tr><tr style="COLOR:#012169"><td><p style="FONT-FAMILY:Arial"><span style="FONT-SIZE:9pt"><strong>e</strong> <a href="mailto:veronica.ochoa@hurleypalmerflatt.com" target="_blank">veronica.ochoa@hurleypalmerflatt.com</a></span></p></td></tr><tr style="COLOR:#012169"><td><p style="FONT-FAMILY:Arial"><strong><span style="FONT-SIZE:9pt"><a href="http://www.hurleypalmerflatt.com" target="_blank">www.hurleypalmerflatt.com</a></span></strong></p></td></tr><tr style="COLOR:#012169"><td><p style="FONT-FAMILY:Arial"><span style="FONT-SIZE:9pt"> </span></p></td></tr></tbody></table>
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