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<p class=MsoNormal><span style='color:#1F497D'>How much effort was put into minimizing
the error of your inputs to justify that level of accuracy in your output? For
example, did you convert real weather data for the two years and use an average
of the simulations? Were you modeling small buildings so you could get a fairly
reasonable infiltration rate empirically? Were occupancy schedules trended, and
for how long? Were all the systems and controls working correctly, with all sensors
calibrated regularly? <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'>1 to 2% seems to me to be fairly
unreasonable. Unless you do an amazing job verifying your inputs, in my opinion
that level of precision doesn’t get you a better model. If you set
everything up as best you can and it comes in there, great! But a correctly set
up model can be off by over 2% because of a couple “El Nino” years,
a facilities guy locking a humidity high limit to 50% for a summer, or any
number of operational factors. On the other side of it, we’ve tried to
match a simple DOE2.2 model to a DOE2.1e model with limited success (I don’t
think we got within 3%, although we didn’t spend too much time with it). Who
knows what the difference would be with E+.<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 know I always squirm when I’m
asked to do existing building models, and it may be irrational. Heck, if the
DOE is asking for 1-2%, I probably am being irrational. But it seems to me that
the error from assumptions could easily swing a model 1-2% (what would a 30%
error on your infiltration do to an otherwise correct building?). What are
other people’s thoughts? <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'>Eric<o:p></o:p></span></p>
<p class=MsoNormal><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"'> equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>David Bastow<br>
<b>Sent:</b> Wednesday, June 16, 2010 3:48 PM<br>
<b>To:</b> aazhari@jainconsultants.com; equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] Actual Building Energy Cost<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='font-size:10.0pt;
font-family:"Arial","sans-serif";color:blue'>On all the DOE modeling
projects that we have done, of an existing building, they have required the
model to be within 1 to 2% or less of the actual energy usage, based on an
average two year history. Is that what you are talking about?</span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:12.0pt;
font-family:"Times New Roman","serif"'> <o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><em><b><span style='font-size:24.0pt;
font-family:"Bradley Hand ITC";color:blue'>David A. Bastow </span></b></em><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><em><b><span style='font-size:12.0pt;
font-family:"Rockwell Extra Bold","serif"'>McClure Engineering, Inc. </span></b></em><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:12.0pt;
font-family:"Times New Roman","serif"'> <o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:12.0pt;
font-family:"Times New Roman","serif"'><o:p> </o:p></span></p>
<div class=MsoNormal align=center style='margin-left:.5in;text-align:center'><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'>
<hr size=2 width="100%" align=center>
</span></div>
<p class=MsoNormal style='mso-margin-top-alt:0in;margin-right:0in;margin-bottom:
12.0pt;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"'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Ahmed
Azhari<br>
<b>Sent:</b> Wednesday, June 16, 2010 12:10 PM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Actual Building Energy Cost</span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'>Hi all, <o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p>
<p class=MsoNormal style='margin-left:.5in'>Does anyone have a ballpark
percentage of the <b>actual</b> annual energy cost versus the <b>modeled</b>
annual energy cost for a building? <o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p>
<p class=MsoNormal style='margin-left:.5in'>Thanks,<o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span lang=EN-CA style='font-size:
10.0pt;font-family:"Arial","sans-serif";color:black'>__________________________________________________________________________</span><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:12.0pt;
color:#0F243E'>Ahmed Azhari</span><span style='font-size:12.0pt;color:#002060'>,
</span><span style='font-size:10.0pt;color:gray'>B.Eng., LEED® AP</span><span
style='font-size:12.0pt;color:#002060'><o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:10.0pt;
color:gray'>Energy Analyst<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:10.0pt;
color:gray'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='color:#0F243E'>Jain
Sustainability Consultants Inc.<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='color:#002060'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:10.0pt;
color:gray'>2260 Argentia Road, 2nd Floor<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:10.0pt;
color:gray'>Mississauga, Ontario L5N 6H7, CANADA<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:10.0pt;
color:gray'>Tel: (905) 542 7211 Ext 234<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:10.0pt;
color:gray'>Fax: (905) 542 7622<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:10.0pt;
color:gray'>Email:</span><span style='font-size:10.0pt'> </span><a
href="mailto:aazhari@jainconsultants.com"><span style='font-size:10.0pt;
color:#0F243E'>aazhari@jainconsultants.com</span></a><span style='font-size:
10.0pt'><o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:10.0pt;
color:gray'>Web: </span><a href="http://www.jainassoc.com/"><span
style='font-size:10.0pt;color:#0F243E'>www.jainassoc.com</span></a><span
style='font-size:10.0pt;color:#0F243E'><o:p></o:p></span></p>
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