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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Take a look at the energy end-use breakdown between the two runs to see which specific areas resulted in savings. For instance if the building has a lot of
lighting and plug loads, the percentage improvement from envelope improvements will be less.<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">Also the LV report that gives you the design load on the space doesn’t include the “system” and ventilation loads, so if your building has a lot of outside
air or high minimum airflows that require reheat energy, both of these could make the impact from envelope upgrades become a smaller percentage.<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">If the form of the building has a lot of interior areas relative to perimeter zones, the percentage reduction from envelope upgrades will be less.<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">You should also confirm the unmet hours were similar between the two cases.<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">Last idea – confirm that you modeled the building with perimeter zones and not one-per-floor configuration.<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">David<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"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">David S. Eldridge, Jr.</span></b><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#244061">, P</span></b><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">.</span></b><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#244061">E</span></b><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">.</span></b><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#244061">,
LEED AP BD+C, BEMP, BEAP, HBDP</span></b><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">Project Manager</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:4.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </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:#365F91">Direct: (847) 316-92</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">24</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#365F91">
| Fax: (</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">847</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#365F91">)
</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">328</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#365F91">-</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">4550</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:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#244061">Grumman/Butkus Associates</span></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:gray">
</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#365F91">| 820 Davis Street, Suite 300 | Evanston, IL 60201</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:9.0pt;font-family:"Calibri","sans-serif";color:gray">Energy Efficiency Consultants and Sustainable Design Engineers</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"><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"><o:p> </o:p></span></p>
<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>Lee Chorney<br>
<b>Sent:</b> Wednesday, August 22, 2012 11:48 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Huge envelope changes having small affect on energy savings<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi All,<br>
<br>
<br>
I recently did a model where I had the same system in both base and proposed but I changed the R-Value from 4 (base) to 20 (proposed). I also changed the window U-value from .80 (base) to .35 (proposed). After I did the run, I saw only a 5% savings between
the heating and cooling use in the model. When I looked at the loads I saw the base had twice as much cooling and heating load than the proposed. Does any know why the energy savings would only be 5% when you have a huge difference between the cooling and
heating loads?<br>
<br>
Thanks,<br>
<br>
Lee<o:p></o:p></p>
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