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<div class=Section1>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Ana/Grammy:<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'>Chiller modeling is a topic that took me many attempts (projects)
to fully get my arms around, so don’t get discouraged if it boggles the
mind.<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'>To start, remember that the reported “space cooling”
end use consumption values may include energy from components other than your
chiller (heat pumps, DX cooling…), so make sure that’s not clouding
your perspective.<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'>With that out of the way, you’re right to first check and
ensure the loads on the loop are appropriate to what you’re trying to
model. I think you should review what CAP</span><span style='font-size:
10.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>hour</span><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> and PLR
really represent… Multiplying them should result in your hourly
load, in Btuh, but if you’re multiplying your “</span><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>operating chiller
capacity at current condition</span><span style='font-size:11.0pt;font-family:
"Calibri","sans-serif";color:#1F497D'>” (Hourly Load) by your PLR then I
suspect the result would be equal to “PLR^2/CAP</span><span
style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>hour.</span><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>”
I’m doubtful that’s the value you were looking for… Let
me suggest two paths to account for what you’re trying to do:<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><u><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>If you are working with the library performance curves</span></u><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>,
recognize you have a limited number of critical inputs to review/edit regarding
the behavior of the chiller itself: Capacity (a part of CAP</span><span
style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>hour</span><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>) and
EIR at the design/rated conditions, the design conditions themselves, and the
associated loop temperatures. If any input on the chiller screens is
something you’re unsure of, right-click it and read/re-read the
associated help entry.<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><u><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>If you want to delve into custom performance curves</span></u><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>, welcome
to the rabbit hole! This required significant personal learning and time
for me to get my arms around, I would suggest expecting the same. I’d
suggest first getting comfortable specifying chillers using the library curves,
per above before pursuing this skillset. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Still here? Okay, the following 3-step program is what I
wish I could go back in time and tell myself months ago:<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span
style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Open the DOE2 help files to Volume 2: Dictionary > HVAC
Components > Chiller. Read everything in the tree in order up to the “Attachment
to Chilled Water Loop” entry, and stop. Pay special attention to
the “Chiller Energy Consumption” article and the sub-entries
describing each performance curve in that equation. When you’re
familiar enough to recount all the variables involved in that equation you
brought up below by memory, proceed to…<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span
style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Download the <a
href="http://www.energydesignresources.com/Portals/0/documents/DesignGuidelines/EDR_DesignGuidelines_%20HVAC_Simulation.pdf">EDR
design guidelines to HVAC simulation</a>, and read the chapter on chillers,
pages 23-44 (of 65). <o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:1.0in;text-indent:-.25in;
mso-list:l0 level2 lfo1'><![if !supportLists]><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>a.<span
style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Re-read
until you feel comfortable understanding what information you need from your
manufacturer rep/vendor. A good rep is always trying to be helpful, and may
unintentionally provide the wrong information and convince you both you’re
on solid footing. You must know exactly what data you do and don’t
need before beginning the discussion of asking for that information.
Whether your vendor/rep can deliver exactly what you want is something of a
toss-up, but it’s a pretty slim chance if you don’t know what that
is yourself.<o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:1.0in;text-indent:-.25in;
mso-list:l0 level2 lfo1'><![if !supportLists]><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>b.<span
style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The equations
presented showing the math behind the coefficients may seem insurmountable, but
for context recognize the author(s) of this document advocating to not figure
out the coefficients directly… rather to let eQuest/DOE2 do that legwork
for you (the “data method”). To an extent this is something
of a reference regarding what’s going on “under the hood.”<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span
style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Read the lengthy discussion I started this week (with
illustrations) under the heading “Chiller Curves (oh boy!).”
This hopefully also bring you full circle to understanding what the default curves
really look like, what they each individually represent, and ultimately how
they work together. Note my discussion revolved around a centrifugal VSD
chiller, for context. Other equipment may use curves of a simpler format.<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'>*If a “bi-quadratic equation” sounds like something that
makes the warp drives work on the Star Ship Enterprise, stop for a second and
review the math – it’s not that crazy. You might want to skip
ahead to see to those visualizations I provided, or even build your own in
excel. <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'>Best of luck!<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'>~Nick<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><img border=0 width=119 height=37 id="Picture_x0020_1"
src="cid:image001.jpg@01CB7CC4.27DC89F0" alt="cid:489575314@22072009-0ABB"></span><b><span
style='font-size:11.0pt;font-family:"Stylus BT","sans-serif";color:#2D4D5E'><o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Stylus BT","sans-serif";
color:#2D4D5E'><o:p> </o:p></span></b></p>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Stylus BT","sans-serif";
color:#2D4D5E'>NICK CATON, E.I.T.</span></b><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'><o:p></o:p></span></b></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Calibri","sans-serif";
color:#CC9900'>PROJECT ENGINEER</span><span style='font-size:7.5pt;color:#CC9900'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>25501 west valley parkway<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>olathe ks 66061<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>direct 913 344.0036<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>fax 913 345.0617<o:p></o:p></span></p>
<p class=MsoNormal><i><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>Check out our new web-site @ </span></i><span style='font-size:
11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><a
href="www.smithboucher.com" title="blocked::www.smithboucher.com"><span
style='font-size:10.0pt'>www.smithboucher.com</span></a></span><u><span
style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:blue'> </span></u><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 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>Grammy<br>
<b>Sent:</b> Friday, November 05, 2010 6:17 AM<br>
<b>To:</b> Ana N.<br>
<b>Cc:</b> equest-users<br>
<b>Subject:</b> Re: [Equest-users] Electricity consumption by CHILLER<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-family:"Comic Sans MS"'>I am also
confusing this problem, and I strongly recommend you to read the
DOE-2 engineering manual, verison 2.1A, and DOE-2.2 volume 4, which can be
downloaded from eQuest web site.</span><o:p></o:p></p>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>On page V.35
- V.38, engineering manual, it introduces the electric calculation of chiller,
and on page 265, volume4, it introduces the chiller variable list number, you
can export the hourly data in eQuest and calculated by hand. I am lost at this
step. As i know at this place, there is something you need to notice, the unit
of assign loading (1) shall be BTU, and electric demand (12) may be kW, then I
still can't get the right number, if you get it, please let me know how.</span><o:p></o:p></p>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p>
<div>
<p class=MsoNormal>On Fri, Nov 5, 2010 at 8:04 AM, Ana N. <<a
href="mailto:ananeddav@hotmail.com" target="_blank">ananeddav@hotmail.com</a>>
wrote:<o:p></o:p></p>
<div>
<p class=MsoNormal> <br>
<span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>I am trying to
calculate/estimate the electricity consumption by a chiller based
on hourly outputs. </span><br>
<span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> </span><br>
<span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>First,
I plugged the cooling coil load on loop and corrected EIR in the the
equitation </span><br>
<span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Elec=
CAP hour* EIR*EIR(t1,t2)*EIR(PLR,dT)/3413 Btu/kW</span><br>
<span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> </span><br>
<span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>but the
calculated annual electricity consumption was not even close to the
numbers reported under Space Cooling Enduse.</span><br>
<span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> </span><br>
<span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>Then, I used
PLR and operating chiller capacity at current condition to calculate CAP
hour (instead of using the cooling coil load on loop), but calculated
numbers did not make any sense.</span><br>
<span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> </span><br>
<span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>Has anyone
done similar calculations? I am sure I am missing something very simple
here, but what?</span><br>
<span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> </span><br>
<span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>Any
suggestions are very appreciated</span><br>
<span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> </span><br>
<span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> </span><br>
<span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>Ana</span><br>
<span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> </span><o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<p class=MsoNormal style='margin-bottom:12.0pt'><br>
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