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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>This was a little study I did out of curiosity last year, and
the results between eQUEST (v3.63) and EnergyPlus (v4.0) matched quite well (~1.4%
difference). All the schedules, zone areas, surface areas were exactly the same
(I checked), but I also chose a simple system; PTAC units for the comparison. I
believe when I was doing this I had checked the performance curves that were
being used in EnergyPlus and they matched the eQUEST curves. <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'>I assume the results will begin to differ when the systems
become more complicated, but even then I believe if both models are calibrated
to match as much as possible the results shouldn’t vary significantly
(assuming all systems are native to the programs and we’re not creating work-arounds
i.e. DOAS in eQUEST using dummy zones or the like).<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'>(FYI, the geometry was ported over to EnergyPlus through a tool
I wrote using Excel and VBA, but it’s a messy process)<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'>Following are some of the results and graphical outputs:<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'><img width=538 height=714 id="Picture_x0020_18"
src="cid:image005.jpg@01CC05CD.6A3BA4B0"></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><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><img width=514 height=351 id="Picture_x0020_25"
src="cid:image006.jpg@01CC05CD.6A3BA4B0"></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'><img width=496 height=168 id="Picture_x0020_32"
src="cid:image008.jpg@01CC05CD.6A3BA4B0"></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'><img width=494 height=128 id="Picture_x0020_39"
src="cid:image010.jpg@01CC05CD.6A3BA4B0"></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'><img width=291 height=226 id="Picture_x0020_46"
src="cid:image012.jpg@01CC05CD.6A3BA4B0"></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'><img width=479 height=278 id="Picture_x0020_53"
src="cid:image014.jpg@01CC05CD.6A3BA4B0"></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'><img width=542 height=271 id="Picture_x0020_60"
src="cid:image016.jpg@01CC05CD.6A3BA4B0"></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'><img width=590 height=566 id="Picture_x0020_74"
src="cid:image026.jpg@01CC05CD.6A3BA4B0"></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'><img width=600 height=706 id="Picture_x0020_67"
src="cid:image027.jpg@01CC05CD.6A3BA4B0"></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>
<div>
<div>
<div>
<p class=MsoNormal><b><span lang=EN-GB style='font-size:8.0pt;font-family:"Arial","sans-serif";
color:black'>____________________</span></b><b><span lang=EN-GB
style='font-size:8.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></b></p>
<p class=MsoNormal><b><span lang=EN-GB style='font-size:8.0pt;font-family:"Arial","sans-serif";
color:black'>Mirza Sajjal</span></b><span lang=EN-GB style='font-size:8.0pt;
font-family:"Arial","sans-serif";color:black'><br>
Engineer</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:8.0pt;font-family:"Arial","sans-serif";
color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:8.0pt;font-family:"Arial","sans-serif";
color:black'>Buro Happold<br>
100 Broadway<br>
New York, NY 10005<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:8.0pt;font-family:"Arial","sans-serif";
color:black'>Tel: +1 212 334 2025<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:8.0pt;font-family:"Arial","sans-serif";
color:black'>Direct: +1 212 616 0380<o:p></o:p></span></p>
</div>
</div>
</div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<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>Pasha
Korber-Gonzalez<br>
<b>Sent:</b> Thursday, April 28, 2011 4:46 PM<br>
<b>To:</b> deepika khowal<br>
<b>Cc:</b> equest-users@lists.onebuilding.org; energyplus_support<br>
<b>Subject:</b> Re: [Equest-users] equest and energy plus outputs<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<div>
<div>
<p class=MsoNormal>As I understand it--Energy+ is free-ware in it's raw
form. I guess I was wrong to make an assumption that Deepika
is using it without an interface. If this is not the case it
might explain such a variance in results. When I model
in DOE-2 raw form---it is so much harder for me to manage my data and inputs in
my head and such----I was not born to be a programmer, and it gives me
nightmares from struggling to pass FORTRAN so many years ago...ugh.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>Therefore, I haven't looked at E+ myself for a very long
time and purchasing or putting out the cost for the user-interface programs is
not as desireable as using the eQuest free-ware. or the future CANQuest
free-ware (future SI version).<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>BUT-- I know that E+ is supposed to have some great
capabilities in which we are limited with DOE-2 (to an
extent.) Has anyone else had the time and desire to compare
these program engines more closely recently? Also--why is it so
difficult to "match" systems in eQuest and E+....forgive my
blase'-ness, but isn't a pkgd system a pkgd system...a pkgd system??? :)<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>Pasha <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><br>
<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>On Thu, Apr 28, 2011 at 11:39 AM, deepika khowal <<a
href="mailto:deepika.khowal@gmail.com">deepika.khowal@gmail.com</a>> wrote:<o:p></o:p></p>
<p class=MsoNormal>So based on my analysis, there is a difference of about 10%
in results of equest and E+. I would believe that because there are certain
parameters which are very difficult to match. <o:p></o:p></p>
<div>
<p class=MsoNormal>this seems reasonable to me. <o:p></o:p></p>
<div>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p>
<div>
<p class=MsoNormal>On Thu, Apr 28, 2011 at 9:09 AM, John Aulbach <<a
href="mailto:jra_sac@yahoo.com" target="_blank">jra_sac@yahoo.com</a>>
wrote:<o:p></o:p></p>
<div>
<div>
<div>
<p class=MsoNormal>I am sure EnergyPlus is a fine and well thought out program
(consider the sources and fine people involved). However, since I am in
production mode (and don't have time to create a model in two different
programs-who pays for THAT), I chose to migrate to eQuest after DOE-2.1 A, B,
C, D, and E. There are plenty of resources to ask questions of, the program
started out in Windows (didn't need "add ons"), and gives me a 3-D
rendering on the building immediately.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>I dealt with 20 years of "raw" DOE-2, where I
didn't know what my building really looked like (until Joe Huang came along
with BDL Draw..). So I would need at age (you guess..) to not relearn an
entirely new program and stick with what I had learned over the past 25+ years.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><a name="12f9d3273db3644d_12f9cdf9b04dbece__MailA"><span
style='font-family:"Calibri","sans-serif";color:#1F497D'>John R. Aulbach, PE,
CEM</span></a><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Senior
Energy Engineer</span><o:p></o:p></p>
<div>
<div class=MsoNormal><span style='font-family:"Calibri","sans-serif";
color:#17365D'>
<hr size=2 width="30%" noshade style='color:#17365D' align=left>
</span></div>
</div>
<p class=MsoNormal><b><span style='font-family:"Calibri","sans-serif";
font-variant:small-caps;color:navy'>Partner</span></b><b><span
style='font-family:"Calibri","sans-serif";font-variant:small-caps;color:green'>
</span></b><b><span style='font-family:"Calibri","sans-serif";font-variant:
small-caps;color:#006600'>Energy</span></b><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>1990
E. Grand Avenue, El Segundo, CA 90245<br>
W: <a href="tel:888-826-1216" target="_blank">888-826-1216</a>, X254| D: <a
href="tel:310-765-7295" target="_blank">310-765-7295</a> | F: <a
href="tel:310-817-2745" target="_blank">310-817-2745</a></span><o:p></o:p></p>
<p class=MsoNormal><a href="http://www.ptrenergy.com/" target="_blank"><span
style='font-family:"Calibri","sans-serif"'>www.ptrenergy.com</span></a><span
style='font-family:"Calibri","sans-serif";color:#1F497D'> </span><a
href="mailto:%7C%20jaulbach@ptrenergy.com" target="_blank"><span
style='font-family:"Calibri","sans-serif"'>| jaulbach@ptrenergy.com</span></a><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><br>
<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
<div>
<div class=MsoNormal align=center style='text-align:center'><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
<hr size=1 width="100%" align=center>
</span></div>
<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"'> deepika khowal <<a
href="mailto:deepika.khowal@gmail.com" target="_blank">deepika.khowal@gmail.com</a>><br>
<b>To:</b> Paul Diglio <<a href="mailto:paul.diglio@sbcglobal.net"
target="_blank">paul.diglio@sbcglobal.net</a>><br>
<b>Cc:</b> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a>;
energyplus_support <<a href="mailto:EnergyPlus_Support@yahoogroups.com"
target="_blank">EnergyPlus_Support@yahoogroups.com</a>><br>
<b>Sent:</b> Thu, April 28, 2011 8:56:34 AM <o:p></o:p></span></p>
<div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'><br>
<b>Subject:</b> Re: [Equest-users] equest and energy plus outputs<o:p></o:p></span></p>
</div>
</div>
<div>
<div>
<p class=MsoNormal><br>
As Joe and others mentioned, its really difficult to create all parameters same
in both softwares. <o:p></o:p></p>
<div>
<p class=MsoNormal>I am still working on it .<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>For ex, which system should I use in equest as equivalent to
unitary system in E+?<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>I understand its difficult to match every input and hence,
getting same results is very tricky.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>Thanks all for their inputs<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
<div>
<p class=MsoNormal>On Thu, Apr 28, 2011 at 4:54 AM, Paul Diglio <<a
href="mailto:paul.diglio@sbcglobal.net" target="_blank">paul.diglio@sbcglobal.net</a>>
wrote:<o:p></o:p></p>
<div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt'>I thought E+ is a free
program? I would be interested to hear from anyone who has used Google
SketchUp and the Open Studio Plug-in to generate a 3D view in E+.<br>
<br>
I would like to hear more about the discrepancies between eQuest and E+ from
those who use both programs.<br>
<br>
Paul Diglio<o:p></o:p></span></p>
<div>
<p class=MsoNormal><span style='font-size:10.0pt'><o:p> </o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt'><o:p> </o:p></span></p>
<div>
<div class=MsoNormal align=center style='text-align:center'><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
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<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"'> Pasha
Korber-Gonzalez <<a href="mailto:pasha.pkconsulting@gmail.com"
target="_blank">pasha.pkconsulting@gmail.com</a>><br>
<b>To:</b> deepika khowal <<a href="mailto:deepika.khowal@gmail.com"
target="_blank">deepika.khowal@gmail.com</a>><br>
<b>Cc:</b> energyplus_support <<a
href="mailto:EnergyPlus_Support@yahoogroups.com" target="_blank">EnergyPlus_Support@yahoogroups.com</a>>;
<a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
<b>Sent:</b> Thu, April 28, 2011 1:27:44 AM<br>
<b>Subject:</b> Re: [Equest-users] equest and energy plus outputs</span><o:p></o:p></p>
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<p class=MsoNormal>Hmmm- an energy plus model showed 50% less energy use (EUI)
than eQuest? Did you use the same weather files? (i.e.
convert the EPW you used in E+ to .bin and use the same weather file in
eQuest?)<o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal>If this is truly the case, this is unsettling as a
simulator. Wouldn't it be safer for our clients to error on the
conservative side and give the eQuest results instead of the E+ results?<o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal>Also--if this is the case, then what is the market advantage
to spending thousands of dollars on E+ software rather than use the FREE-ware
eQuest program??<o:p></o:p></p>
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<p class=MsoNormal>I'd appreciate any commentary to help me "see the
light" of this topic. And if Deepika is willing to share a visual of
his energy results output, I'm super curious to see what it is showing...<o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal>Good question/good info...thanks,<o:p></o:p></p>
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<p class=MsoNormal>Pasha<o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal>Korber Energy Consultants<o:p></o:p></p>
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<br>
<o:p></o:p></p>
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<p class=MsoNormal>On Wed, Apr 27, 2011 at 7:11 PM, deepika khowal <<a
href="mailto:deepika.khowal@gmail.com" target="_blank">deepika.khowal@gmail.com</a>>
wrote:<o:p></o:p></p>
<p class=MsoNormal>Thanks Joe <o:p></o:p></p>
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<p class=MsoNormal>Even I realized the same thing. the total energy
use in Energy plus was almost 50% less than equest.<o:p></o:p></p>
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<p class=MsoNormal>If this is the case, who would you know that you model is
working fine? <o:p></o:p></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p>
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<p class=MsoNormal>On Wed, Apr 27, 2011 at 6:06 PM, Joe Huang <<a
href="mailto:yjhuang@whiteboxtechnologies.com" target="_blank">yjhuang@whiteboxtechnologies.com</a>>
wrote:<o:p></o:p></p>
<p class=MsoNormal>I was involved in a two year project 2005-2007 to convert
the Calif. Energy Commission's Title-24 certification suite of building tests
from DOE-2.1E to EnergyPlus. There are some areas where it's difficult to
get comparable inputs due to differences or limitations in the models. The
differences between the two programs varied a lot depending on the building,
weather, and HVAC system. For the CEC certification suite of 160 runs, cooling
results were more consistent, within 10% in most cases, with EnergyPlus almost
always on the high side; for heating, the differences were much greater,
sometimes with EnergyPlus being 40-60% lower than DOE-2.1E. I have a
120-page report on this comparison, but haven't bothered to put it on the Web.<br>
<br>
Joe<br>
<br>
Joe Huang<br>
White Box Technologies, Inc.<br>
346 Rheem Blvd., Suite 108D<br>
Moraga CA 94556<br>
<a href="mailto:yjhuang@whiteboxtechnologies.com" target="_blank">yjhuang@whiteboxtechnologies.com</a><br>
<a href="http://www.whiteboxtechnologies.com/" target="_blank">www.whiteboxtechnologies.com</a><br>
(o) (925)388-0265<br>
(c) (510)928-2683<br>
"building energy simulations at your fingertips"<br>
<br>
<br>
<br>
deepika khowal wrote:<o:p></o:p></p>
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<p class=MsoNormal>HI All<br>
I am trying to create same model in equest and energy plus to see whether i see
same results and just to validate my simulation files.<br>
has anyone done this before?<br>
I would like to know what is the % difference in both software outputs?<br>
Thanks<br>
Deepika<o:p></o:p></p>
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