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<p class="MsoNormal"><span style="color:#1F497D">Impact of weather depends on how climate-responsive the building is. Recently finished a paper that showed +-5% variation in year-to-year weather in some building types (constant volume systems mostly) and more
than 20% in others. Location and humidity also play a role. One building type that is extremely energy-intensive (restaurant) also had high variation due to weather – outside preheating/cooling.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Images from extremely hot and extremely cold climates – identical model, actual weather from 1980-2014. 1980 on right. TMY-type files on left.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><img width="288" height="199" id="Picture_x0020_1" src="cid:image001.png@01D093B1.C3E98560"><img width="288" height="198" id="Picture_x0020_2" src="cid:image002.png@01D093B1.C3E98560"></span><span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b>From:</b> Bldg-sim [mailto:bldg-sim-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Jacob Dunn<br>
<b>Sent:</b> Thursday, May 21, 2015 10:05 AM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] Comparing ASHRAE 90.1 App G Models to Real Buildings<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Bldg-Sim Community – <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’m trying to compile a list of why it might be inappropriate to compare Appendix G models to actual consumption data. This comes about because I recently got into a debate with one of my co-workers when looking at the infamous NBI chart/study
that shows little correlation to predicted and actual energy values of LEED buildings. I was trying to explain that the Appendix G model’s intent is NOT to be compared to actual consumption, as it is a modeling protocol aimed at creating consistent relative
comparisons for LEED points. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Here are the reasons thus far that support this notion (that App G models shouldn’t be compared to actual data). Does anyone know of any resources out there that expand upon this? Or can you think other reasons?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Appendix G does not take into account external shading, which can be critical in urban environments for accurate energy predictions<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Schedules are typically not created with the intent of being predictive. Overall building hours are adhered to, but detailed schedule creation is not usually in the scope of a LEED model (or is it, in your experience?). For instance,
typical plug load base values during unoccupied times are .3, this is a pretty big assumption.<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>The App G model uses a TMY weather file, which can vary from the current weather year (I wonder on average by how much?)<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Infiltration values are assumed, unless blower door testing has been done (which is rare for commercial buildings).<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Thermostat values are modeled as consistent across the building, which is rarely the case in an actual operating building<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Any additional insight is much appreciated!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#7D7773;letter-spacing:.3pt">Jacob Dunn LEED AP BD+C</span></b><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#7D7773;letter-spacing:.3pt"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#A9AA23;letter-spacing:.3pt">ESKEW+DUMEZ+RIPPLE, APC</span></b><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:black;letter-spacing:.3pt">
<o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:110%"><span style="font-size:8.0pt;line-height:110%;font-family:"Arial",sans-serif;color:#7D7773;letter-spacing:.3pt">2014 AIA National Architecture Firm Award<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#7D7773;letter-spacing:.3pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#7D7773;letter-spacing:.3pt">365 Canal Street Suite 3150
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#7D7773;letter-spacing:.3pt">New Orleans LA 70130<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#7D7773;letter-spacing:.3pt">504.561.8686<o:p></o:p></span></p>
<p class="MsoNormal"><u><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#7D7773;letter-spacing:.3pt"><a href="http://www.eskewdumezripple.com/" target="_blank"><span style="color:#7D7773">eskewdumezripple.com</span></a></span><span style="color:#7D7773"><o:p></o:p></span></u></p>
<p class="MsoNormal"><o:p> </o:p></p>
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