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<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy">I suppose I should have been more specific in my description:<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy">By baseline I mean the proposed design. So the program outputs 2 sim files – the base(proposed, CHW) case and the iterated (DX) case<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy">We want to use eQuest to validate the system choice on this particular project. This is work that was started before I joined, but I
have been selected to try and use eQuest to compare the performance of a chilled water system and a DX system. I’m not the most experienced energy modeler, but it seems like a task that would be a good application for eQuest.
<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal" style="text-indent:.5in"><font size="2" color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">My approach was to simulate the energy consumption of a building that is similar to the actual design in orientation,
shape, and square footage. I initially built the model in the SD wizard, using most of the default values (building envelope, activity usage, etc.), autosize the equipment, and use the EEM to compare the two systems. The idea was that when the building construction
and geometry are equal, we can look at the relative energy consumption of the two systems. This initial simulation reported that the DX system would be more efficient, which is not what I had expected based on the design that had been selected.<o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-indent:.5in"><font size="2" color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">So I figured that maybe my model was too generic, too simple. I created zones based on the plans, and made the
geometry more representative of the actual building. These changes produced reports that suggest the chilled water system is more efficient than the DX. I realized that the EEM was incorrectly modeling the change – it was treating the chilled water system
as having all 8 air handlers, but was modeling the DX system as one AHU. So I created a duplicate model that has a DX system (autosized and using equest defaults).
<o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-indent:.5in"><font size="2" color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">The comparison of these two models suggests the DX system is slightly more efficient. Unfortunately, my lack
of experience makes me doubt the validity of this comparison – especially considering that the engineers selected a chilled water system for this project.
<o:p></o:p></span></font></p>
<p class="MsoNormal" style="text-indent:.5in"><font size="2" color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal" style="text-indent:.5in"><font size="2" color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">So I suppose my questions are: Does my approach seem valid? Is this an appropriate use of the software?<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy">After taking some time to write this note, and with a little rest, I wonder if comparing the proposed design to an ASHRAE 90.1 baseline
would have been a better approach.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy">Regards,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy">Matt Clough<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
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<p class="MsoNormal"><b><font size="2" face="Tahoma"><span style="font-size:10.0pt;
font-family:Tahoma;font-weight:bold">From:</span></font></b><font size="2" face="Tahoma"><span style="font-size:10.0pt;font-family:Tahoma"> Nick Caton [mailto:ncaton@smithboucher.com]
<br>
<b><span style="font-weight:bold">Sent:</span></b> Monday, April 23, 2012 3:40 PM<br>
<b><span style="font-weight:bold">To:</span></b> Matt Clough; <st1:PersonName w:st="on">
equest-users@lists.onebuilding.org</st1:PersonName><br>
<b><span style="font-weight:bold">Subject:</span></b> RE: EEM vs. new model</span></font><o:p></o:p></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:
12.0pt"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1F497D">By context, I gather by ‘baseline’ you mean something other than your proposed design, such as an 90.1 Appendix G baseline or
similar.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1F497D"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1F497D">If that’s the case, my general advice is that you should
<u>much</u> more heavily weight the comparative results using your “actual/proposed” model. A baseline per above inherently diverges from the actual building materials, lighting power densities, solar load shading, and so forth. It’s not the same building.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1F497D"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1F497D">Best to choose systems that most efficiently handle your actual project. Don’t get too hung up what works best for an imaginary
building ;).<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1F497D"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1F497D">~Nick<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1F497D"><o:p> </o:p></span></font></p>
<div>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1F497D"><img width="119" height="37" id="Picture_x005f_x005f_x005f_x0020_1" src="cid:image001.jpg@01CD21E4.A27D6780" alt="cid:489575314@22072009-0ABB"></span></font><b><font size="2" color="#2d4d5e" face="Stylus BT"><span style="font-size:11.0pt;
font-family:"Stylus BT";color:#2D4D5E;font-weight:bold"><o:p></o:p></span></font></b></p>
<p class="MsoNormal"><b><font size="2" color="#2d4d5e" face="Stylus BT"><span style="font-size:11.0pt;font-family:"Stylus BT";color:#2D4D5E;font-weight:bold"><o:p> </o:p></span></font></b></p>
<p class="MsoNormal"><b><font size="3" color="#2d4d5e" face="Stylus BT"><span style="font-size:12.0pt;font-family:"Stylus BT";color:#2D4D5E;font-weight:bold">NICK CATON, P.E.<o:p></o:p></span></font></b></p>
<p class="MsoNormal"><font size="1" color="#cc9900" face="Calibri"><span style="font-size:7.5pt;font-family:Calibri;color:#CC9900">SENIOR ENGINEER<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="1" color="#cc9900" face="Calibri"><span style="font-size:7.5pt;font-family:Calibri;color:#CC9900"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#2d4d5e" face="Calibri"><span style="font-size:10.0pt;font-family:Calibri;color:#2D4D5E">Smith & Boucher Engineers</span></font><font size="1" color="#cc9900"><span style="font-size:
7.5pt;color:#CC9900"><o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#2d4d5e" face="Calibri"><span style="font-size:10.0pt;font-family:Calibri;color:#2D4D5E">25501 west valley parkway,
<st1:address w:st="on"><st1:Street w:st="on">suite</st1:Street> 200</st1:address><o:p></o:p></span></font></p>
<p class="MsoNormal"><st1:City w:st="on"><st1:place w:st="on"><font size="2" color="#2d4d5e" face="Calibri"><span style="font-size:10.0pt;font-family:Calibri;
color:#2D4D5E">olathe</span></font></st1:place></st1:City><font size="2" color="#2d4d5e" face="Calibri"><span style="font-size:10.0pt;font-family:Calibri;
color:#2D4D5E">,
ks 66061<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#2d4d5e" face="Calibri"><span style="font-size:10.0pt;font-family:Calibri;color:#2D4D5E">direct 913.344.0036<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#2d4d5e" face="Calibri"><span style="font-size:10.0pt;font-family:Calibri;color:#2D4D5E">fax 913.345.0617<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1F497D"><a href="www.smithboucher.com" title="blocked::www.smithboucher.com"><font size="2"><span style="font-size:10.0pt">www.smithboucher.com</span></font></a></span></font><u><font size="2" color="blue" face="Calibri"><span style="font-size:10.0pt;font-family:Calibri;
color:blue">
</span></font></u><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1F497D"><o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1F497D"><o:p> </o:p></span></font></p>
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<p class="MsoNormal"><b><font size="2" face="Tahoma"><span style="font-size:10.0pt;
font-family:Tahoma;font-weight:bold">From:</span></font></b><font size="2" face="Tahoma"><span style="font-size:10.0pt;font-family:Tahoma"> equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b><span style="font-weight:
bold">On Behalf Of
</span></b>Matt Clough<br>
<b><span style="font-weight:bold">Sent:</span></b> Monday, April 23, 2012 1:59 PM<br>
<b><span style="font-weight:bold">To:</span></b> <st1:PersonName w:st="on">equest-users@lists.onebuilding.org</st1:PersonName><br>
<b><span style="font-weight:bold">Subject:</span></b> [Equest-users] EEM vs. new model<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:
12.0pt"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;
font-family:Arial">Salutations eQuesters,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;
font-family:Arial"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;
font-family:Arial">I’m doing a simple comparison between a chilled water and DX system. It would seem that this is a great opportunity to use the EEM, and the simulation predicted
that the CHW configuration would be more energy efficient than the DX system. To be conservative, I also made a copy of the baseline model and changed the system from chilled water to DX. Using this method, the simulation predicts that the DX system would
be more efficient (although not by much). Which result is most accurate? The building is a car dealership with a large showroom and an air-conditioned parts storage area.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;
font-family:Arial"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;
font-family:Arial">The geometry and building envelope are not exact, but I made this decision because we are doing this for comparison purposes, so the geometry and construction
will be the same. <o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;
font-family:Arial">I have let eQuest autosize both systems.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;
font-family:Arial"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;
font-family:Arial">Sincerely,
<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;
font-family:Arial">Matt Clough<o:p></o:p></span></font></p>
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