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<DIV dir=ltr align=left><SPAN class=428053115-17062010><FONT color=#0000ff
size=2 face=Arial>Of course, your fee reflects the amount of accuracy the client
is requiring you to have. Some clients might only expect 5-20% accuracy,
and of course you would provide them with a lower fee. However, in over 17
years of running hourly, climate history based, energy estimating software, (not
always eQUEST), I don't ever remember doing a study where we were satisfied with
being more than 5% off on our final base model. If you are happy with
being 25% or more off, then why even do a model, you might as well just guess or
do some kind of energy saving hand calculation. The fun part is getting
modeled gas usage and electrical usage, month to month, to follow
historical monthly trends and still be close to the annual energy usage on
both. When you get both the annual energy usage and the monthly
energy usage of gas and electric close to historical usage, then that's when you
feel good about your base model to compare against ECM runs.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=428053115-17062010></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=428053115-17062010><FONT color=#0000ff
size=2 face=Arial>No one said this was easy. That's why you earn ever dime
of your fee. Your first preliminary base model run, if you do a
good job, might be 5-20% off historical usage. To even get that close
normally requires an extensive survey, documenting ever identifiable
energy using item, interviews regarding usage by the occupants and maybe even
data logging usage of some important items, to confirm actual usage.
It can, depending on the size and complexity of the modeled building, take
several days to a week or more and a hundred or more runs to
just create a good solid base model, that reflects historical usage.
That's why modeling a new building, without any historic energy usage data to
match, other than approximate BTU's per square foot, is a piece of
cake. </FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=428053115-17062010></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=428053115-17062010>
<DIV align=left>
<DIV align=left><STRONG><EM><FONT color=#0000ff size=6
face="Bradley Hand ITC">David A. Bastow </FONT></EM></STRONG></DIV>
<DIV align=left><STRONG><EM><FONT face="Rockwell Extra Bold">McClure
Engineering, Inc. </FONT></EM></STRONG></DIV></DIV></SPAN></DIV><BR>
<DIV dir=ltr lang=en-us class=OutlookMessageHeader align=left>
<HR tabIndex=-1>
<FONT size=2 face=Tahoma><B>From:</B> Eric O'Neill
[mailto:elo@MichaelsEngineering.com] <BR><B>Sent:</B> Wednesday, June 16, 2010
3:52 PM<BR><B>To:</B> David Bastow; aazhari@jainconsultants.com;
equest-users@lists.onebuilding.org<BR><B>Subject:</B> RE: [Equest-users] Actual
Building Energy Cost<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=WordSection1>
<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-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<P style="MARGIN-LEFT: 0.5in" class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">From:</SPAN></B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">
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 style="MARGIN-LEFT: 0.5in" class=MsoNormal><o:p> </o:p></P>
<P style="MARGIN-LEFT: 0.5in" class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: blue; FONT-SIZE: 10pt">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-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"><o:p></o:p></SPAN></P>
<P style="MARGIN-LEFT: 0.5in" class=MsoNormal><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"> <o:p></o:p></SPAN></P>
<P style="MARGIN-LEFT: 0.5in" class=MsoNormal><EM><B><SPAN
style="FONT-FAMILY: 'Bradley Hand ITC'; COLOR: blue; FONT-SIZE: 24pt">David A.
Bastow </SPAN></B></EM><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"><o:p></o:p></SPAN></P>
<P style="MARGIN-LEFT: 0.5in" class=MsoNormal><EM><B><SPAN
style="FONT-FAMILY: 'Rockwell Extra Bold','serif'; FONT-SIZE: 12pt">McClure
Engineering, Inc. </SPAN></B></EM><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"><o:p></o:p></SPAN></P>
<P style="MARGIN-LEFT: 0.5in" class=MsoNormal><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"> <o:p></o:p></SPAN></P>
<P style="MARGIN-LEFT: 0.5in" class=MsoNormal><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"><o:p> </o:p></SPAN></P>
<DIV style="TEXT-ALIGN: center; MARGIN-LEFT: 0.5in" class=MsoNormal
align=center><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt">
<HR align=center SIZE=2 width="100%">
</SPAN></DIV>
<P
style="MARGIN-BOTTOM: 12pt; MARGIN-LEFT: 0.5in; MARGIN-RIGHT: 0in; mso-margin-top-alt: 0in"
class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">From:</SPAN></B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">
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-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"><o:p></o:p></SPAN></P>
<P style="MARGIN-LEFT: 0.5in" class=MsoNormal>Hi all, <o:p></o:p></P>
<P style="MARGIN-LEFT: 0.5in" class=MsoNormal><o:p> </o:p></P>
<P style="MARGIN-LEFT: 0.5in" class=MsoNormal>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 style="MARGIN-LEFT: 0.5in" class=MsoNormal><o:p> </o:p></P>
<P style="MARGIN-LEFT: 0.5in" class=MsoNormal>Thanks,<o:p></o:p></P>
<P style="MARGIN-LEFT: 0.5in" class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: 10pt"
lang=EN-CA>__________________________________________________________________________</SPAN><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: 10pt"><o:p></o:p></SPAN></P>
<P style="MARGIN-LEFT: 0.5in" class=MsoNormal><SPAN
style="COLOR: #0f243e; FONT-SIZE: 12pt">Ahmed Azhari</SPAN><SPAN
style="COLOR: #002060; FONT-SIZE: 12pt">, </SPAN><SPAN
style="COLOR: gray; FONT-SIZE: 10pt">B.Eng., LEED® AP</SPAN><SPAN
style="COLOR: #002060; FONT-SIZE: 12pt"><o:p></o:p></SPAN></P>
<P style="MARGIN-LEFT: 0.5in" class=MsoNormal><SPAN
style="COLOR: gray; FONT-SIZE: 10pt">Energy Analyst<o:p></o:p></SPAN></P>
<P style="MARGIN-LEFT: 0.5in" class=MsoNormal><SPAN
style="COLOR: gray; FONT-SIZE: 10pt"><o:p> </o:p></SPAN></P>
<P style="MARGIN-LEFT: 0.5in" class=MsoNormal><SPAN style="COLOR: #0f243e">Jain
Sustainability Consultants Inc.<o:p></o:p></SPAN></P>
<P style="MARGIN-LEFT: 0.5in" class=MsoNormal><SPAN
style="COLOR: #002060"><o:p> </o:p></SPAN></P>
<P style="MARGIN-LEFT: 0.5in" class=MsoNormal><SPAN
style="COLOR: gray; FONT-SIZE: 10pt">2260 Argentia Road, 2nd
Floor<o:p></o:p></SPAN></P>
<P style="MARGIN-LEFT: 0.5in" class=MsoNormal><SPAN
style="COLOR: gray; FONT-SIZE: 10pt">Mississauga, Ontario L5N 6H7,
CANADA<o:p></o:p></SPAN></P>
<P style="MARGIN-LEFT: 0.5in" class=MsoNormal><SPAN
style="COLOR: gray; FONT-SIZE: 10pt">Tel: (905) 542 7211 Ext
234<o:p></o:p></SPAN></P>
<P style="MARGIN-LEFT: 0.5in" class=MsoNormal><SPAN
style="COLOR: gray; FONT-SIZE: 10pt">Fax: (905) 542 7622<o:p></o:p></SPAN></P>
<P style="MARGIN-LEFT: 0.5in" class=MsoNormal><SPAN
style="COLOR: gray; FONT-SIZE: 10pt">Email:</SPAN><SPAN style="FONT-SIZE: 10pt">
</SPAN><A href="mailto:aazhari@jainconsultants.com"><SPAN
style="COLOR: #0f243e; FONT-SIZE: 10pt">aazhari@jainconsultants.com</SPAN></A><SPAN
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style="COLOR: gray; FONT-SIZE: 10pt">Web: </SPAN><A
href="http://www.jainassoc.com/"><SPAN
style="COLOR: #0f243e; FONT-SIZE: 10pt">www.jainassoc.com</SPAN></A><SPAN
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