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<p class=MsoNormal><span style='color:black'>I know there is some work on a document
to provide a framework for developers to implement automated (or even
semi-automated!) generation of base cases within their software for various
purposes.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:black'>Keep an eye out for that, I’m
not sure of the current status or timing of it. Even prior to
implementation by any developers it will be a great resource for our community
when we make these comparisons manually.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:black'>David<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'>http://www.grummanbutkus.com<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Nick
Caton<br>
<b>Sent:</b> Tuesday, November 24, 2009 10:20 AM<br>
<b>To:</b> jwearstler@larseneng.com; Equest Forum<br>
<b>Subject:</b> Re: [Equest-users] Equest Base Model vs. ASHRAE 90.1<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>At the moment, it’s up to the end-user to be sure your
baseline model is meeting the 90.1 minimum baseline criteria. If you
haven’t already checked it out, Appendix G explains how the model is to be
set up and calibrated to a level of performance (measured via unmet load hours)
that’s to be in the same ballpark as your proposed design. If you
apply all design criteria there into eQuest, then you’re following 90.1.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:black'>…</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'>Until the day comes when software developers are producing
“intelligent” energy modeling software that makes evaluative
decisions as effectively as a human being, I don’t think the task of
“generate a baseline energy model per 90.1” is even a feasible
concept. Even if such a (complex) feature was around to use, you’d
still have to do a complete proposed model for the baseline to reference for
geometries/occupancies/zoning/etc – building the baseline after that is
not a huge relative investment of time in my experience… <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'>In summary, I don’t think effective/useful energy modeling
for 90.1-based compliance is conceptually possible without involvement from a
human that’s at least somewhat familiar with 90.1’s Appendix G
– it cannot be automated without a degree of accuracy loss that I think
most would find unacceptable. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:black'>…</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'>For the record, I do think a good “wishlist” item
for the coming versions of eQuest, to facilitate easier, more consistent and
less error-prone 90.1 baseline modeling for users of all experience levels,
would be to create a library of 8 systems for use during HVAC system wizard-level
definition (See attached screenshot/paint masterpiece for when/where/what
I’m thinking). These would define a set of defaults for one of the
8 standard baseline systems, but would still require the end-user to determine
project specific wizard-level criteria (such as climate zone-specific
economizer/high limit requirements and such). I’ve noted that the
recent 90.1-2007 and 90.1-2004 are identical in these definitions, so that
lends some consolation that such efforts would not become “out-of-date”
for some time to come.<o:p></o:p></span></p>
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