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<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Hi
Lyle,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>I
think you need to review a little further before proceeding. Read through the
attached discussion from the bottom up. This discussion diverges a bit (as
performance curve topics usually do) but I think you’re a bit ahead of the
curve so to speak (har har!) in recognizing what the IPLV numbers really mean.
Plugging in your IPLV values as coefficients for a cubic equation (where f(x) =
Ax^3+Bx^2+Cx+D) is pretty much wildly different from the correct course of
action, but you’re definitely in the ballpark’s parking lot ;).<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Ultimately,
you (and others – listen up!) will probably have the best shot of getting it
right on the first go if you visualize what you’re doing in excel. That’s what
worked for me when I was climbing this mountain:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>Assemble your part
load percentages and corresponding EER’s in excel<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>Stop and review what
the curve in eQuest is looking up, and from what variable(s). You can glean
this from the title of the default curve used… In this case, you want eQuest
to determine EIR each hour as a function of Part load (EIRfPLR). <o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>Knowing that,
convert convert your EER values to to EIR<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>Now, normalize each
EIR value to the ARI value*. If the EER at ARI is 9, and your 50% part load
EER is 6, then the normalized vaule is 6/9 = 0.67. This normalized number is
actually a multiplier of sorts that eQuest will apply against your specified ARI
efficiency in the chiller input window. If none of this is making sense, go
back further and review my “recommended reading” list in a thread called “Chiller
curves, oh boy!” from sometime last year in the archives.<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>Using excel, plot
these normalized efficiencies (y-axis) against the part load ratios (x-axis)
with a scatter chart.<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>Right click and add
a curve-fit to the series. In the dialog, try making it third order (quadratic)
and see if you get a good fit. Check the option to display the curve equation.<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>Voila, there are
your four coefficients (A,B,C,D – see eQuest’s curve inputs to be sure you know
which is which in the quadratic format) for eQuest! You’ve also developed a
visual check to ensure the numbers make sense.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>*Important:
You MUST work from ARI-condition data points, and normalize to the ARI condition,
and specify your chiller’s capacity/efficiency at ARI conditions, if you are
trying to only make PLR curves without doing a full set of custom curves. The
reasons why are complex, and I’ve already nearly written a book on the matter
in the archives if you’re itching to know why ^_^. If you want to specify your
chiller around design conditions, then it’s all or nothing (library curves)
with regard to custom curve creation!<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'>A
general statement/consolation to everyone: We all have to crawl before we can
run! Make no mistake, coming to a true fundamental understanding of custom
curves in eQuest/DOE2, to the point you can manipulate and even create them on
your own, is no small feat. They should give out medals! The best way to
develop this skill set is to accept you will probably screw it up a few times
to start, look hard at your results, and read up on the literature/advice that’s
out there in order to learn what it is that you personally don’t know. Once
you come around to understanding what you do know, and more importantly what
you know that you don’t know… (<a
href="http://en.wikiquote.org/wiki/Donald_Rumsfeld">Donald Rumsfeld would make
a good energy modeler, lol</a>), it’s all downhill from there, and you can begin
to ask the right questions of yourself and others to bridge your personal
gaps. Making mistakes is commendable, provided you resolve to learn from them!
<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='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'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#1F497D'><img
border=0 width=119 height=37 id="_x0000_i1026"
src="cid:image001.jpg@01CC2B74.97958120" alt="cid:489575314@22072009-0ABB"></span><b><span
style='font-family:"Stylus BT","sans-serif";color:#2D4D5E'><o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'><o:p> </o:p></span></b></p>
<p class=MsoNormal><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'>NICK CATON, P.E.</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'>SENIOR ENGINEER<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Calibri","sans-serif";
color:#CC9900'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>Smith & Boucher Engineers</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, suite 200<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><span style='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='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 border=0 width=119 height=37 id="Picture_x0020_1"
src="cid:image001.jpg@01CC2B74.97958120" 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-family:"Stylus BT","sans-serif";
color:#2D4D5E'>NICK CATON, P.E.</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'>SENIOR ENGINEER<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Calibri","sans-serif";
color:#CC9900'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>Smith & Boucher Engineers</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, suite 200<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><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>Robby
Oylear<br>
<b>Sent:</b> Wednesday, June 15, 2011 2:43 PM<br>
<b>To:</b> Lyle Keck<br>
<b>Cc:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] IPLV Curve Fit<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Lyle,<o:p></o:p></p>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>The short answer is no. IPLV cannot be used to create
performance curves in eQUEST.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>Part-load curves are a strange animal in eQUEST. You'll need
cooperation from the chiller manufacturer to get the correct data. You
need to have enough data to describe the way energy varies as a function of
part-load, chilled water supply temp, and outside air temperature. Take a
look at the attached spreadsheet which can be used to create curves in eQUEST.
The data in yellow should be entered by the manufacturer or
manufacturer's rep. The data in red should be entered into eQUEST. <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>If you look into the formulas, you'll note that EIR-FPLR is
actually not an EIR factor, it is based on the power draw of the equipment at
part-load compared to at full-load. This throws a lot of people off as it
is not described that way in the help documentation.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>The interesting question that arises when working with custom
part-load curves is how accurate does the eQUEST default performance curve
model the required IPLV for the baseline per ASHRAE 90.1? In my
experience the default curve is approximately 10% worse than the IPLV
requirement.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>Hope this helps,<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>Robby Oylear, LEED AP BD+C<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>Mechanical Project Engineer<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>Energy Analyst<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>Rushing<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
<div>
<p class=MsoNormal>On Wed, Jun 15, 2011 at 10:59 AM, Lyle Keck <<a
href="mailto:lkeck@aeieng.com">lkeck@aeieng.com</a>> wrote:<o:p></o:p></p>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>All,
<br>
<br>
I am trying to create a part load curve for an air-cooled screw chiller.
I have the EER & COP data for 100%, 75%, 50%, and 25% loading. <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>I
have read through the various posts in the archives and I am still unsure if I
should input this data as ‘raw data’ or ‘coefficients’ <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>From
previous posts: <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Courier New"'>IPLV (or NPLV) = 0.01A+0.42B+0.45C+0.12D</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Courier New"'>Where:</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Courier New"'>A = COP or EER @ 100% Load</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Courier New"'>B = COP or EER @ 75% Load</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Courier New"'>C = COP or EER @ 50% Load</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Courier New"'>D = COP or EER @ 25% Load</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>It
is my understanding that EIR-PLR curves give the EIR as a function of part load
ratio. <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>SO,
if I create a ‘cubic’ curve with input type ‘curve coefficients’, and input
a=(1/COP-100%), b=(1/COP-75%), c=(1/COP-50%), and d=(1/COP-25%) and specify
this curve as the EIR - f(part load ratio) curve, would that be accurate?
<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Additionally,
this chiller has a condenser water temp of 95 degF and design conditions that
differ from AHRI conditions (design EWT=58 degF and LWT=44 degF)<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Do
these values have direct correlation to the curve creation ? Or can the
condenser and CHW temp simply be defined in the ‘basic specifications’ tab for
the chiller, and the EWT defined via the CHW loop deltaT?<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>I
know this topic has been widely discussed, but I am still uneasy about the
actual inputs for the creation of the part load performance curve.<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Any
input, or reference to a previous post would be appreciated.<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Thanks
in advance,<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<table class=MsoNormalTable border=0 cellpadding=0 width=474 style='width:355.5pt'>
<tr>
<td width=167 valign=top style='width:125.25pt;padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:10.0pt;color:#660000;text-transform:uppercase'>Lyle Keck</span></b><b><span
style='font-size:9.0pt;color:#333333'> </span></b><span
style='font-size:9.0pt;color:#333333'><br>
</span><span style='font-size:10.0pt;color:#333333;text-transform:uppercase'>SustainablE
Systems Analyst</span><o:p></o:p></p>
</td>
<td width=10 valign=top style='width:7.5pt;padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:9.0pt;color:#333333'> </span><o:p></o:p></p>
</td>
<td width=283 valign=top style='width:212.25pt;padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:9.0pt;color:#660000'>AEI</span></b><span style='font-size:
9.0pt;color:#333333'> | AFFILIATED ENGINEERS, INC. <br>
Westlake Center Office Tower, 1601 Fifth Avenue, Suite 1400 | Seattle, WA
98101<br>
<br>
</span><span style='font-size:9.0pt;color:#660000'>P: <a
href="tel:206.256.0800" target="_blank">206.256.0800</a> | F: <a
href="tel:206.256.0423" target="_blank">206.256.0423</a></span><span
style='font-size:9.0pt;color:#333333'> <br>
</span><span style='font-size:9.0pt;color:#660000'><a
href="mailto:lkeck@aeieng.com" target="_blank"><span style='color:#660000;
text-decoration:none'>lkeck@aeieng.com</span></a> | <b><a
href="http://www.aeieng.com/" target="_blank"><span style='color:#660000;
text-decoration:none'>www.aeieng.com</span></a></b></span><span
style='font-size:9.0pt;color:#333333'> </span><o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
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