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<p class=MsoNormal><span style='color:#1F497D'>Cyrus,<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'>I would suggest doing some basic
verification. ASHRAE fundamentals has a few chapters with a lot of good info on
heating and cooling loads that you can serve as a double check. I wouldn’t
suggest just accepting the results on blind faith. There are quite a few inputs
to a model, and although sometimes things can be mentally justified (like what
I did in my previous response), they aren’t necessarily theoretically
justified (if you have an economizer, then my example makes no sense). Do some
hand calculations, and make some predictions and test and verify various
settings. I would also suggest doing some hourly reports for both simulations,
and lining up the 8760 data next to each other and see if the corresponding
discrepancies between the simulated insulation differences line up when you
would expect them to. <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'>In terms of selecting an
insulation value through eQuest, I would be careful about the validity of that
sort of prediction. The model is only as good as your inputs. The simulations
should be used as a reasonable estimate for the savings of a specific ECM,
however, using it to identify a peak savings value seems contrary to what energy
modeling should be used for. Appendix G states (under G1.2 note 2) “Neither
the proposed building performance nor the baseline building performance are
predictions of actual energy consumption or costs”. I think the intention
of this is to say we should be using the energy model to give us an analysis of
certain measures, but should not be used as a design tool.<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'>Also, make sure your utility
rates are set up properly. If there is peak demand savings on a ratcheted utility
rate for the higher insulation, it might use more total energy, but if your
demand is high enough, the bills could potentially be lower (which is how LEED
EAcr1 judges the effectiveness of the measures). <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>Eric</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif";
color:#1F497D'> </span><span style='color:#1F497D'><o:p></o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal style='margin-left:.5in'><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"'> Cyrus Grimes
[mailto:cgrimes@dynamix-ltd.com] <br>
<b>Sent:</b> Friday, December 19, 2008 10:15 AM<br>
<b>To:</b> Eric O'Neill<br>
<b>Cc:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> RE: [Equest-users] Increase in roof insulation increases
cooling load.<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='color:#1F497D'>This is
a school and 70% of the rooms have about 25 kids. I was skeptical at first I
guess I will concede. I just don’t have the confidence in Equest yet. I
guess I can play around with the insulation and fin the preferred insulative
value for the roof, do you suppose such a prediction would be valid?<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal style='margin-left:.5in'><span style='font-family:"Arial","sans-serif";
color:white;background:black;mso-highlight:black'>
Cyrus Grimes, LEED<sup>®</sup>
AP
</span><span style='font-family:"Arial","sans-serif";color:white'>.
<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-family:"Arial","sans-serif";
color:red'>
Mechanical Engineer<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:8.0pt;
font-family:"Arial","sans-serif";color:#1F497D'>Phone (614) 443-1178 ext. 274<o:p></o:p></span></p>
</div>
<p class=MsoNormal style='margin-left:.5in'><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal style='margin-left:.5in'><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"'> Eric O'Neill
[mailto:elo@MichaelsEngineering.com] <br>
<b>Sent:</b> Friday, December 19, 2008 11:03 AM<br>
<b>To:</b> Cyrus Grimes<br>
<b>Cc:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> RE: [Equest-users] Increase in roof insulation increases
cooling load.<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='color:#1F497D'>Cyrus,<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='color:#1F497D'>Depending
on your internal gains, the increased levels of roofing insulation may make it
more difficult for the system to reject the heat. I generally find this
response when modeling auditoriums or rooms with high levels of internal gains.
The system ends up working overtime to displace the heat that would normally
have escaped after the internal loads subsided and/or ambient conditions cooled
off. For instance, on a 45 degree day, the building might break even with a
high internal gain and low roof insulation, but with the higher roof
insulation, the internal gains dominate and cooling is required. It really
depends on the scenario, but without more information, I can only say that
it’s plausible. <o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:#1F497D'>Eric</span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif";color:#1F497D'> </span><span
style='color:#1F497D'><o:p></o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal style='margin-left:1.0in'><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>Cyrus
Grimes<br>
<b>Sent:</b> Friday, December 19, 2008 9:34 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Increase in roof insulation increases cooling
load.<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal style='margin-left:1.0in'><o:p> </o:p></p>
<p class=MsoNormal style='margin-left:1.0in'>In a parametric run the roofing
insulation was increased from U= 0.063 to U=0.033. by increasing the thickness
of the “Insul Bd 2in (HF-B3)” of the built up roof from 0.28 to
0.64.<o:p></o:p></p>
<p class=MsoNormal style='margin-left:1.0in'><o:p> </o:p></p>
<p class=MsoNormal style='margin-left:1.0in'>In my results the HVAC cooling
load increased by 4% and my heating load decreased by 4%. Overall the net
change was -1% energy savings.<o:p></o:p></p>
<p class=MsoNormal style='margin-left:1.0in'><o:p> </o:p></p>
<p class=MsoNormal style='margin-left:1.0in'>Is this reasonable?<o:p></o:p></p>
<p class=MsoNormal style='margin-left:1.0in'> Any suggestions?<o:p></o:p></p>
<p class=MsoNormal style='margin-left:1.0in'><o:p> </o:p></p>
<p class=MsoNormal style='margin-left:1.0in'>thanks<o:p></o:p></p>
<p class=MsoNormal style='margin-left:1.0in'><o:p> </o:p></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='font-family:"Arial","sans-serif";
color:white;background:black;mso-highlight:black'>
Cyrus Grimes, LEED<sup>®</sup>
AP
</span><span style='font-family:"Arial","sans-serif";color:white'>.
<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='font-family:"Arial","sans-serif";
color:red'>
Mechanical Engineer<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='font-size:5.0pt;
font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:1.0in'><b><span style='font-size:8.0pt;
font-family:"Arial","sans-serif"'>Corporate Office<o:p></o:p></span></b></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='font-size:8.0pt;
font-family:"Arial","sans-serif"'>1108 City Park Avenue, 3<sup>rd</sup> Floor<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='font-size:8.0pt;
font-family:"Arial","sans-serif"'>Columbus, Ohio 43206<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='font-size:5.0pt;
font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='font-size:8.0pt;
font-family:"Arial","sans-serif"'>Phone (614) 443-1178 ext. 274<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='font-size:8.0pt;
font-family:"Arial","sans-serif"'>Fax: (614) 443-1594<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:1.0in'><i><span style='font-size:6.0pt;
font-family:"Arial","sans-serif"'>e-mail: cgrimes@dynamix-ltd.com<o:p></o:p></span></i></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='font-size:5.0pt;
font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='font-family:"Arial","sans-serif";
color:red;letter-spacing:5.5pt'> www.dynamix-ltd.com<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='font-size:20.0pt;
font-family:Webdings;color:#007F00'>P</span><span style='font-family:"Arial","sans-serif";
color:#00007B'> </span><span style='font-size:7.5pt;color:#007F00'>Please
consider the environment before printing this e-mail note</span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:1.0in'><o:p> </o:p></p>
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