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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Dear Jeremiah,
<div>I recently completed my dissertation on reusing today's design-phase (compliance) energy models post-design, focusing on a building owner's perspective. For #2, "How does a proposed building typically stack up against the utility bills?", I'd say it partially
depends on the original purpose of the model. Was the modeler trying to predict utility bills, or rather demonstrate compliance with a code/standard? <span style="font-size: 10pt;">For example, for LEED-compliance models under older LEED (ASHRAE 90.1) protocol,
modelers made default assumptions regarding plug-loads. This could lead to very inaccurate models, especially for energy-intensive programs such as labs or data centers. I have some case studies, but they're essentially specific to these older versions of
LEED. I'm not sure if that's helpful to you.</span></div>
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<div><span style="font-size: 10pt;">For #3, "How accurate should an existing building model be to be considered useful?", I'd say it depends on what you're trying to do with the model. Test future retrofits? </span><span style="font-size: 10pt;">Benchmark the
building?</span><span style="font-size: 10pt;"> Detect subtle equipment faults? I have a couple case studies that involved such major building faults that even relatively poorly-calibrated models (per ASHRAE 14 definitions) helped detect the problems. Again,
I'm not sure if that's relevant to you.</span></div>
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<div>I'm happy to share my findings if they're relevant. Please contact me if this sounds like it might be helpful.</div>
<div>Best,</div>
<div>Holly</div>
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<div><font color="#ff6600" face="Arial" size="1">Holly W. Samuelson<br>
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<div><font color="#999999" face="Arial" size="1">Doctor of Design </font><font color="#999999" face="Arial" size="1"><font color="#888888"><font color="#999999" size="1">|
</font></font>Registered Architect | LEED AP BD+C <br>
Lecturer Harvard Graduate School of Design</font></div>
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<div id="divRpF245858" style="direction: ltr;"><font face="Tahoma" size="2" color="#000000"><b>From:</b> Jeremiah Crossett [jcrossett@phasechange.com]<br>
<b>Sent:</b> Monday, June 17, 2013 10:08 PM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org; Terry Puccini<br>
<b>Subject:</b> [Bldg-sim] Recommended reading on comparison of models to actual?<br>
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<div><font color="#336666"><font><font face="tahoma,sans-serif">Dear bldg sim,</font></font></font>
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<div><font color="#336666"><font><font face="tahoma,sans-serif">I am looking for papers that elaborate on the concept of modeling, and how it correlates to actual utility data to share with people within my company.</font></font></font></div>
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<div><font color="#336666"><font><font face="tahoma,sans-serif">The questions keeps popping up, eg.. </font></font></font></div>
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<li><span style="font-family:tahoma,sans-serif; color:rgb(51,102,102)">How does a baseline building compare to an average building?</span></li><li><span style="font-family:tahoma,sans-serif; color:rgb(51,102,102)">How does a proposed building typically stack up against the utility bills once the building is built?</span>
</li><li><font color="#336666" face="tahoma, sans-serif">How accurate an existing building model should be to be considered useful, and how accurate is typically possible? </font></li><li><font color="#336666" face="tahoma, sans-serif">For an experimental setup what would be considered to be close enough to be considered a "validated" model? </font>
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<div><font color="#336666" face="tahoma, sans-serif">My understanding is that modeling is to show relationships between average a baseline of a chosen vintage and that of a proposed design in terms of relative percentages. For existing buildings I think that
useful is within 20% and typically possible is 10%. Then for a validation model, the most important factor is similar curves and close totals. </font></div>
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<div><font color="#336666" face="tahoma, sans-serif">If anyone has any recommended papers, or personal experience it would be appreciated. </font></div>
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<div><font color="#336666" face="tahoma, sans-serif">Kind regards </font></div>
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<div style="text-align:center"><b><span style="background-color:rgb(255,255,255)"><font size="1" color="#000099"><b style="font-family:Verdana,sans-serif">Jeremiah D. Crossett</b><span style="font-family:Verdana,sans-serif"> </span><font face="Verdana, sans-serif">|
Senior </font><font face="Verdana, sans-serif">Analyst</font><font face="Verdana, sans-serif"> | Phase Change Energy Solutions</font></font></span></b></div>
<b>
<div style="text-align:center"><b><span style="background-color:rgb(255,255,255)"><font size="1"><font face="Verdana, sans-serif" color="#000099">120 E. Pritchard St. | Asheboro, NC 27203 | Mobile 503-688-8951</font></font></span></b></div>
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