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<div class=Section1>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Hey Carol =),<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'>My guts are all over the place on this issue (well that sounds
morbid…), but it would appear by the existence of the DESIGN-PLR variable (for
centrifugal chillers only), eQuest/DOE2 wants to scale these normalized curves
to that 120% mark. There’s a pretty good example explaining why under the DOE2
help entry for “DESIGN-PLR.”<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'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><img width=119 height=37 id="Picture_x0020_1"
src="cid:image001.jpg@01CB7B47.BE1AE840" 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"'> Carol Gardner
[mailto:cmg750@gmail.com] <br>
<b>Sent:</b> Wednesday, November 03, 2010 10:33 AM<br>
<b>To:</b> James Newman<br>
<b>Cc:</b> Nick Caton; equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] Chiller Curves (oh boy!)<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'>My gut is telling me that
unless you are selecting your chiller to function at 120%, or in effect making
that the "design" condition, you should use the 100% capacity for
your curve. <o:p></o:p></p>
<div>
<p class=MsoNormal>On Wed, Nov 3, 2010 at 8:08 AM, James Newman <<a
href="mailto:James.Newman@me-engineers.com">James.Newman@me-engineers.com</a>>
wrote:<o:p></o:p></p>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>Nick,</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>I am also working away at the unsolved
mystery of creating a chiller curve. I have come to the conclusion that if you
are only inputting an EIR-PLR curve, you must do this at ARI rated
conditions because the other two curves, (CAP and EIR) are equest defaults at
ARI conditions. I failed at making all three curves as my results ended
up cutting the energy use to about an 1/8. I think in order to make the
(CAP and EIR) curves you must have a full range of chiller supply temps and
condenser supply temps. The information I was provided was with the same supply
and condenser temps with the variables being load and kw/ton. I’m going to try
to construct a new curve with conforming everything to ARI conditions and see
what the results come back as.</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:11.0pt;color:#87C139'>James M. Newman, EIT, LEED AP</span></b><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;color:#48494A'>Project Engineer / Energy Analyst</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;color:#87C139'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'><a href="http://www.me-engineers.com/"
target="_blank"><b><span style='color:#87C139'>M-E Engineers, Inc.</span></b></a></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;color:#48494A'>10055 west 43rd avenue</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;color:#48494A'>wheat ridge, co 80033</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;color:#48494A'> </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;color:#48494A'>office: 303.421.6655</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;color:#48494A'>direct: 720.898.3148</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'><a
href="mailto:catie.williams@me-engineers.com" target="_blank"><span
style='font-size:10.0pt;color:#595959'>james.newman@me-engineers.com</span></a></span><o:p></o:p></p>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<div>
<div style='border:none;border-top:solid windowtext 1.0pt;padding:3.0pt 0in 0in 0in;
border-color:-moz-use-text-color -moz-use-text-color'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:10.0pt'>From:</span></b><span style='font-size:10.0pt'> <a
href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>
[mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org"
target="_blank">equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of
</b>Nick Caton<br>
<b>Sent:</b> Wednesday, November 03, 2010 9:03 AM<br>
<b>To:</b> Carol Gardner; <a href="mailto:equest-users@lists.onebuilding.org"
target="_blank">equest-users@lists.onebuilding.org</a><o:p></o:p></span></p>
<div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt'><br>
<b>Subject:</b> Re: [Equest-users] Chiller Curves (oh boy!)<o:p></o:p></span></p>
</div>
</div>
</div>
</div>
<div>
<div>
<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'><span
style='font-size:11.0pt;color:#1F497D'>Thanks for the response Carol!</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>That 120% load case is what I’m getting
at – let me try to explain a little further:</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>In the DOE2 help files, the vocabulary
for centrifugal chillers is “design capacity” and “maximum capacity,” where
“design” means the capacity at the rated or designed conditions (at which you
define / specify your chiller), and “maximum” means the capacity the chiller is
really capable of under the same conditions if it runs balls-out (maximum power
to the refrigerant drive).</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>The help file excerpt I copied below
with the red line is pretty explicitly telling us to normalize the part load
values to the <u>maximum</u> capacity for centrifugal chillers. I’ve
highlighted a second line for clarity. The EDR guidelines I linked below
are saying you can instead normalize to the <u>design</u> capacity for the
EIR-PLR curve if that’s all your field measurements or manufacturer rep can
provide.</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>I’m asking – are both approaches
right? </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>My first and second questions are kinda
tied together… How would choosing to normalize to either the maximum or design
conditions affect how we should handle the DESIGN-PLR ratio, if at all?</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>~Nick.</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'><img border=0 width=119 height=37
id="_x0000_i1025" src="cid:image001.jpg@01CB7B47.BE1AE840"
alt="cid:489575314@22072009-0ABB"></span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:11.0pt;color:#2D4D5E'> </span></b><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:11.0pt;color:#2D4D5E'>NICK CATON, E.I.T.</span></b><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:7.5pt;color:#CC9900'>PROJECT ENGINEER</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;color:#2D4D5E'>25501 west valley parkway</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;color:#2D4D5E'>olathe ks 66061</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;color:#2D4D5E'>direct 913 344.0036</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;color:#2D4D5E'>fax 913 345.0617</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><i><span
style='font-size:10.0pt;color:#2D4D5E'>Check out our new web-site @ </span></i><span
style='font-size:11.0pt;color:#1F497D'><a href="http://www.smithboucher.com"
target="_blank" title="blocked::www.smithboucher.com"><span style='font-size:
10.0pt'>www.smithboucher.com</span></a></span><u><span style='font-size:10.0pt;
color:blue'> </span></u><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<div style='border:none;border-top:solid windowtext 1.0pt;padding:3.0pt 0in 0in 0in;
border-color:-moz-use-text-color -moz-use-text-color'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:10.0pt'>From:</span></b><span style='font-size:10.0pt'> Carol
Gardner [mailto:<a href="mailto:cmg750@gmail.com" target="_blank">cmg750@gmail.com</a>]
<br>
<b>Sent:</b> Tuesday, November 02, 2010 10:04 PM<br>
<b>To:</b> Nick Caton<br>
<b>Cc:</b> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Equest-users] Chiller Curves (oh boy!)</span><o:p></o:p></p>
</div>
<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;margin-bottom:12.0pt'>Let me
take a crack at this. If by design capacity you mean the chiller running at
100% load, you would create the curve(s) by normalizing around your ARI design
conditions i.e. the PLR curve would be 1.0 at this point, call it ARI Cap and
the other points would be 90% Cap/ARI Cap, 80% Cap/ARI Cap, etc. The same would
go for your temp curves. If, however, your chiller is operating at 120%, or
some such other level, I would normalize the curve around the ARI design
conditions of the chiller at 120%. I had to do this for a VRV hp that was
selected at the 120% design condition.<br>
<br>
I find this from the DOE2 manual the most helpful:<o:p></o:p></p>
<div style='border-top:solid windowtext 1.0pt;border-left:none;border-bottom:
solid windowtext 1.0pt;border-right:none;padding:0in 0in 0in 0in;border-color:
-moz-use-text-color'>
<div>
<div>
<p> <o:p></o:p></p>
</div>
</div>
</div>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><a
href="http://volume2dictionary.htm" target="_blank">Volume 2: Dictionary</a>
> <a href="http://hvaccomponents.htm" target="_blank">HVAC Components</a>
> <a href="http://curvefit.htm" target="_blank"><span style='color:white;
background:#316AC5'>CURVE</span>-<span style='color:white;background:#316AC5'>FIT</span></a>
> <a href="http://inputtypedata.htm" target="_blank">INPUT-TYPE = DATA</a><o:p></o:p></p>
</div>
<h5>INDEPENDENT-2<o:p></o:p></h5>
<p>Used for all <span style='color:white;background:#316AC5'>curves</span>
having two independent variables. A list of up to twenty values of the second
independent variable. The number of values should be the same as for DEPENDENT.<o:p></o:p></p>
<p><b>Example 1</b>: defining a <span style='color:white;background:#316AC5'>curve</span>
by inputting a set of data points.<o:p></o:p></p>
<p>A packaged system (PZS) has cooling performance significantly different from
that used in the default model. The manufacturer lists the data shown in
Table 46, for cooling capacity, at 2000 cfm design air flow rate, as a function
of outside dry-bulb temperature and entering wet-bulb temperature.<o:p></o:p></p>
<p><a name="12c12482e002036e__Ref490744859"></a><a
name="12c12482e002036e__Ref490744804"></a>Table 46 Cooling capacity
(kBtu/hr) vs. temperature<o:p></o:p></p>
<div style='margin-top:2.0pt;margin-bottom:2.0pt'>
<div align=center>
<table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0
style='border-collapse:collapse'>
<tr>
<td width=96 rowspan=2 valign=top style='width:1.0in;border:solid windowtext 1.0pt;
background:aqua;padding:0in 5.4pt 0in 5.4pt;background-attachment:scroll;
background-position-x:0%;background-position-y:0%'>
<p align=center style='margin-top:0in;text-align:center'><b>Outside<br>
Dry-bulb</b><o:p></o:p></p>
</td>
<td width=288 colspan=3 valign=top style='width:3.0in;border-top:solid windowtext 1.0pt;
border-left:none;border-bottom:none;border-right:solid windowtext 1.0pt;
background:aqua;padding:0in 5.4pt 0in 5.4pt;border-color:-moz-use-text-color;
background-attachment:scroll;background-position-x:0%;background-position-y:
0%'>
<p align=center style='text-align:center'><b>Entering Wet-bulb</b><o:p></o:p></p>
</td>
</tr>
<tr>
<td width=96 valign=top style='width:1.0in;border:none;border-bottom:solid windowtext 1.0pt;
background:aqua;padding:0in 5.4pt 0in 5.4pt;border-color:-moz-use-text-color -moz-use-text-color windowtext;
background-attachment:scroll;background-position-x:0%;background-position-y:
0%'>
<p align=center style='text-align:center'><b>72F</b><o:p></o:p></p>
</td>
<td width=96 valign=top style='width:1.0in;border:none;border-bottom:solid windowtext 1.0pt;
background:aqua;padding:0in 5.4pt 0in 5.4pt;border-color:-moz-use-text-color -moz-use-text-color windowtext;
background-attachment:scroll;background-position-x:0%;background-position-y:
0%'>
<p align=center style='text-align:center'><b>67F</b><o:p></o:p></p>
</td>
<td width=96 valign=top style='width:1.0in;border-top:none;border-left:none;
border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
background:aqua;padding:0in 5.4pt 0in 5.4pt;border-color:-moz-use-text-color windowtext windowtext -moz-use-text-color;
background-attachment:scroll;background-position-x:0%;background-position-y:
0%'>
<p align=center style='text-align:center'><b>62F</b><o:p></o:p></p>
</td>
</tr>
<tr>
<td width=96 valign=top style='width:1.0in;border-top:none;border-left:solid windowtext 1.0pt;
border-bottom:none;border-right:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt;
border-color:-moz-use-text-color windowtext'>
<p align=center style='text-align:center'>85F<o:p></o:p></p>
</td>
<td width=96 valign=top style='width:1.0in;padding:0in 5.4pt 0in 5.4pt'>
<p align=center style='text-align:center'>69<o:p></o:p></p>
</td>
<td width=96 valign=top style='width:1.0in;padding:0in 5.4pt 0in 5.4pt'>
<p align=center style='text-align:center'>65<o:p></o:p></p>
</td>
<td width=96 valign=top style='width:1.0in;border:none;border-right:solid windowtext 1.0pt;
padding:0in 5.4pt 0in 5.4pt;border-color:-moz-use-text-color windowtext -moz-use-text-color -moz-use-text-color'>
<p align=center style='text-align:center'>60<o:p></o:p></p>
</td>
</tr>
<tr>
<td width=96 valign=top style='width:1.0in;border-top:none;border-left:solid windowtext 1.0pt;
border-bottom:none;border-right:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt;
border-color:-moz-use-text-color windowtext'>
<p align=center style='text-align:center'>95F<o:p></o:p></p>
</td>
<td width=96 valign=top style='width:1.0in;padding:0in 5.4pt 0in 5.4pt'>
<p align=center style='text-align:center'>68<o:p></o:p></p>
</td>
<td width=96 valign=top style='width:1.0in;padding:0in 5.4pt 0in 5.4pt'>
<p align=center style='text-align:center'>63 (ARI)<o:p></o:p></p>
</td>
<td width=96 valign=top style='width:1.0in;border:none;border-right:solid windowtext 1.0pt;
padding:0in 5.4pt 0in 5.4pt;border-color:-moz-use-text-color windowtext -moz-use-text-color -moz-use-text-color'>
<p align=center style='text-align:center'>57<o:p></o:p></p>
</td>
</tr>
<tr>
<td width=96 valign=top style='width:1.0in;border-top:none;border-left:solid windowtext 1.0pt;
border-bottom:none;border-right:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt;
border-color:-moz-use-text-color windowtext'>
<p align=center style='text-align:center'>105F<o:p></o:p></p>
</td>
<td width=96 valign=top style='width:1.0in;padding:0in 5.4pt 0in 5.4pt'>
<p align=center style='text-align:center'>65<o:p></o:p></p>
</td>
<td width=96 valign=top style='width:1.0in;padding:0in 5.4pt 0in 5.4pt'>
<p align=center style='text-align:center'>60<o:p></o:p></p>
</td>
<td width=96 valign=top style='width:1.0in;border:none;border-right:solid windowtext 1.0pt;
padding:0in 5.4pt 0in 5.4pt;border-color:-moz-use-text-color windowtext -moz-use-text-color -moz-use-text-color'>
<p align=center style='text-align:center'>53<o:p></o:p></p>
</td>
</tr>
<tr>
<td width=96 valign=top style='width:1.0in;border:solid windowtext 1.0pt;
border-top:none;padding:0in 5.4pt 0in 5.4pt;border-color:-moz-use-text-color windowtext windowtext'>
<p align=center style='text-align:center'>115F<o:p></o:p></p>
</td>
<td width=96 valign=top style='width:1.0in;border:none;border-bottom:solid windowtext 1.0pt;
padding:0in 5.4pt 0in 5.4pt;border-color:-moz-use-text-color -moz-use-text-color windowtext'>
<p align=center style='text-align:center'>62<o:p></o:p></p>
</td>
<td width=96 valign=top style='width:1.0in;border:none;border-bottom:solid windowtext 1.0pt;
padding:0in 5.4pt 0in 5.4pt;border-color:-moz-use-text-color -moz-use-text-color windowtext'>
<p align=center style='text-align:center'>55<o:p></o:p></p>
</td>
<td width=96 valign=top style='width:1.0in;border-top:none;border-left:none;
border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0in 5.4pt 0in 5.4pt;border-color:-moz-use-text-color windowtext windowtext -moz-use-text-color'>
<p align=center style='margin-bottom:0in;margin-bottom:.0001pt;text-align:
center'>49<o:p></o:p></p>
</td>
</tr>
</table>
</div>
</div>
<p> <o:p></o:p></p>
<p>In this example the independent variables are the entering wet-bulb
temperature and the outside dry-bulb temperature. Because there are two
independent variables and they have units of temperature, we input a <span
style='color:white;background:#316AC5'>curve</span> of TYPE BI-QUADRATIC-T
using the given data points. The dependent variable is not the cooling capacity
listed in the table but rather the cooling capacity divided by the cooling
capacity at the ARI rating point (95 F outside dry-bulb and 67 F entering
wet-bulb). In other words, the capacities should be normalized to the ARI
rating point., as shown in Table 47<o:p></o:p></p>
<p><a name="12c12482e002036e__Ref490745029">Table </a>47 Normalized
capacity vs. temperature<o:p></o:p></p>
<div style='margin-top:2.0pt;margin-bottom:2.0pt'>
<div align=center>
<table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0
style='border-collapse:collapse'>
<tr>
<td width=96 rowspan=2 valign=top style='width:1.0in;border:solid windowtext 1.0pt;
background:aqua;padding:0in 5.4pt 0in 5.4pt;background-attachment:scroll;
background-position-x:0%;background-position-y:0%'>
<p align=center style='margin-top:0in;text-align:center'><b>Outside<br>
Dry-bulb</b><o:p></o:p></p>
</td>
<td width=288 colspan=3 valign=top style='width:3.0in;border-top:solid windowtext 1.0pt;
border-left:none;border-bottom:none;border-right:solid windowtext 1.0pt;
background:aqua;padding:0in 5.4pt 0in 5.4pt;border-color:-moz-use-text-color;
background-attachment:scroll;background-position-x:0%;background-position-y:
0%'>
<p align=center style='text-align:center'><b>Entering Wet-bulb</b><o:p></o:p></p>
</td>
</tr>
<tr>
<td width=96 valign=top style='width:1.0in;border:none;border-bottom:solid windowtext 1.0pt;
background:aqua;padding:0in 5.4pt 0in 5.4pt;border-color:-moz-use-text-color -moz-use-text-color windowtext;
background-attachment:scroll;background-position-x:0%;background-position-y:
0%'>
<p align=center style='text-align:center'><b>72F</b><o:p></o:p></p>
</td>
<td width=96 valign=top style='width:1.0in;border:none;border-bottom:solid windowtext 1.0pt;
background:aqua;padding:0in 5.4pt 0in 5.4pt;border-color:-moz-use-text-color -moz-use-text-color windowtext;
background-attachment:scroll;background-position-x:0%;background-position-y:
0%'>
<p align=center style='text-align:center'><b>67F</b><o:p></o:p></p>
</td>
<td width=96 valign=top style='width:1.0in;border-top:none;border-left:none;
border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
background:aqua;padding:0in 5.4pt 0in 5.4pt;border-color:-moz-use-text-color windowtext windowtext -moz-use-text-color;
background-attachment:scroll;background-position-x:0%;background-position-y:
0%'>
<p align=center style='text-align:center'><b>62F</b><o:p></o:p></p>
</td>
</tr>
<tr>
<td width=96 valign=top style='width:1.0in;border-top:none;border-left:solid windowtext 1.0pt;
border-bottom:none;border-right:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt;
border-color:-moz-use-text-color windowtext'>
<p align=center style='text-align:center'>85F<o:p></o:p></p>
</td>
<td width=96 valign=top style='width:1.0in;padding:0in 5.4pt 0in 5.4pt'>
<p align=center style='text-align:center'>1.095<o:p></o:p></p>
</td>
<td width=96 valign=top style='width:1.0in;padding:0in 5.4pt 0in 5.4pt'>
<p align=center style='text-align:center'>1.032<o:p></o:p></p>
</td>
<td width=96 valign=top style='width:1.0in;border:none;border-right:solid windowtext 1.0pt;
padding:0in 5.4pt 0in 5.4pt;border-color:-moz-use-text-color windowtext -moz-use-text-color -moz-use-text-color'>
<p align=center style='text-align:center'>0.952<o:p></o:p></p>
</td>
</tr>
<tr>
<td width=96 valign=top style='width:1.0in;border-top:none;border-left:solid windowtext 1.0pt;
border-bottom:none;border-right:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt;
border-color:-moz-use-text-color windowtext'>
<p align=center style='text-align:center'>95F<o:p></o:p></p>
</td>
<td width=96 valign=top style='width:1.0in;padding:0in 5.4pt 0in 5.4pt'>
<p align=center style='text-align:center'>1.079<o:p></o:p></p>
</td>
<td width=96 valign=top style='width:1.0in;padding:0in 5.4pt 0in 5.4pt'>
<p align=center style='text-align:center'>1.0 (ARI)<o:p></o:p></p>
</td>
<td width=96 valign=top style='width:1.0in;border:none;border-right:solid windowtext 1.0pt;
padding:0in 5.4pt 0in 5.4pt;border-color:-moz-use-text-color windowtext -moz-use-text-color -moz-use-text-color'>
<p align=center style='text-align:center'>0.905<o:p></o:p></p>
</td>
</tr>
<tr>
<td width=96 valign=top style='width:1.0in;border-top:none;border-left:solid windowtext 1.0pt;
border-bottom:none;border-right:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt;
border-color:-moz-use-text-color windowtext'>
<p align=center style='text-align:center'>105F<o:p></o:p></p>
</td>
<td width=96 valign=top style='width:1.0in;padding:0in 5.4pt 0in 5.4pt'>
<p align=center style='text-align:center'>1.032<o:p></o:p></p>
</td>
<td width=96 valign=top style='width:1.0in;padding:0in 5.4pt 0in 5.4pt'>
<p align=center style='text-align:center'>0.952<o:p></o:p></p>
</td>
<td width=96 valign=top style='width:1.0in;border:none;border-right:solid windowtext 1.0pt;
padding:0in 5.4pt 0in 5.4pt;border-color:-moz-use-text-color windowtext -moz-use-text-color -moz-use-text-color'>
<p align=center style='text-align:center'>0.841<o:p></o:p></p>
</td>
</tr>
<tr>
<td width=96 valign=top style='width:1.0in;border:solid windowtext 1.0pt;
border-top:none;padding:0in 5.4pt 0in 5.4pt;border-color:-moz-use-text-color windowtext windowtext'>
<p align=center style='text-align:center'>115F<o:p></o:p></p>
</td>
<td width=96 valign=top style='width:1.0in;border:none;border-bottom:solid windowtext 1.0pt;
padding:0in 5.4pt 0in 5.4pt;border-color:-moz-use-text-color -moz-use-text-color windowtext'>
<p align=center style='text-align:center'>0.984<o:p></o:p></p>
</td>
<td width=96 valign=top style='width:1.0in;border:none;border-bottom:solid windowtext 1.0pt;
padding:0in 5.4pt 0in 5.4pt;border-color:-moz-use-text-color -moz-use-text-color windowtext'>
<p align=center style='text-align:center'>0.873<o:p></o:p></p>
</td>
<td width=96 valign=top style='width:1.0in;border-top:none;border-left:none;
border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0in 5.4pt 0in 5.4pt;border-color:-moz-use-text-color windowtext windowtext -moz-use-text-color'>
<p align=center style='margin-bottom:0in;margin-bottom:.0001pt;text-align:
center'>0.778<o:p></o:p></p>
</td>
</tr>
</table>
</div>
</div>
<p> <o:p></o:p></p>
<p>The <span style='color:white;background:#316AC5'>CURVE</span>-<span
style='color:white;background:#316AC5'>FIT</span> input will look like the
following:<o:p></o:p></p>
<p>CAP-<span style='color:white;background:#316AC5'>CURVE</span>-1 = <span
style='color:white;background:#316AC5'>CURVE</span>-<span style='color:white;
background:#316AC5'>FIT</span><br>
TYPE
= BI-QUADRATIC-T<br>
INPUT-TYPE = DATA<br>
DEPENDENT =
(1.000,1.079,0.905,1.032,0.952,0.841,<br>
0.984,0.873,0.778,1.095,1.032,0.952) ..<br>
IN-TEMP1 =
( 67, 72, 62, 72,
67, 62,<br>
72, 67, 62,
72, 67, 62) ..<br>
IN-TEMP2 =
( 95, 95, 95, 105, 105,
105,<br>
115, 115, 115,
85 85, 85) ..<o:p></o:p></p>
<p><b>Example 2:</b> Defining a <span style='color:white;background:#316AC5'>curve</span>
by inputting coefficients<o:p></o:p></p>
<p>We want a furnace to have a constant efficiency as a function of part load.
To do this we must replace the default FURNACE-HIR-FPLR with a <span
style='color:white;background:#316AC5'>curve</span> that will give a constant
efficiency. The <span style='color:white;background:#316AC5'>curve</span> TYPE
is QUADRATIC in the part load ratio (PLR). PLR correction <span
style='color:white;background:#316AC5'>curves</span> are always multiplied by the
unit capacity, not the load, to obtain the energy (fuel or electricity) use.
Thus the <span style='color:white;background:#316AC5'>curve</span> we want is:
0.0 + 1.0*PLR + 0.0*PLR*PLR. The input will look like:<o:p></o:p></p>
<p>New-Furnace-HIR-fPLR = <span style='color:white;background:#316AC5'>CURVE</span>-<span
style='color:white;background:#316AC5'>FIT</span><br>
TYPE
= QUADRATIC<br>
INPUT-TYPE = COEFFICIENTS<br>
COEFFICIENTS = (0.0,1.0,0.0) ..<o:p></o:p></p>
<p>Then in the SYSTEM command we include:<o:p></o:p></p>
<p> FURNACE-HIR-FPLR = New-Furnace-HIR-fPLR<o:p></o:p></p>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'> <o:p></o:p></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>On
Tue, Nov 2, 2010 at 3:21 PM, Nick Caton <<a
href="mailto:ncaton@smithboucher.com" target="_blank">ncaton@smithboucher.com</a>>
wrote:<o:p></o:p></p>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='color:#1F497D'>Hi everyone!</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='color:#1F497D'>I think I have <u>finally</u> wrapped my mind completely
around custom chiller performance curves for a centrifugal VSD chiller.
I’ve got a few specific questions now that I’m on the other side of the fence:</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='color:#1F497D'> </span><o:p></o:p></p>
<p><span style='color:#1F497D'>1.</span><span style='font-size:7.0pt;
color:#1F497D'> </span><span
style='color:#1F497D'>Is it necessary for the data points of a part load
efficiency curve (EIR-FPLR&dT in my case) to originate from data with a 1.0
(100%) PLR ratio corresponding to a maximum vs. a design load capacity?
>From what I gather in <a
href="http://www.energydesignresources.com/Portals/0/documents/DesignGuidelines/EDR_DesignGuidelines_%20HVAC_Simulation.pdf"
target="_blank">the EDR reference</a> (re: “Method 2” on PDF page 32/65), this
curve can be generated using part-load readings assuming a <u>design</u>
capacity at the 100% loading mark… but the DOE2 help entry for “EIR-FPLR” seems
to suggest otherwise (copied below – see highlighted line).</span><o:p></o:p></p>
<p><span style='color:#1F497D'>2.</span><span style='font-size:7.0pt;
color:#1F497D'> </span><span
style='color:#1F497D'>If the above part load efficiency curve is created based
on data where the 100% loading point corresponds to the maximum (not design)
capacity, should “DESIGN-PLR” (the ratio of design to maximum capacity) be set
to 1.00 and the capacity of the chiller be specified at its maximum (not
design) for the design/rated conditions? As I write this question it
sounds like I’m chasing my tail – someone straighten me out =)!</span><o:p></o:p></p>
<p><span style='color:#1F497D'>3.</span><span style='font-size:7.0pt;
color:#1F497D'> </span><span
style='color:#1F497D'>When you veterans finish a project with sets of custom
performance curves, do you have any suggestions for a naming scheme for future
reference/re-use? I’m currently thinking to keep the curves grouped in an
.inp snippet I for importing along with an equipment cutsheet… but I’m certain
I’ll forget the all the details as quickly as humanly possible when this
project is behind me…</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.25in'><span style='color:#1F497D'> ~Nick</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='color:#1F497D'> </span><o:p></o:p></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='color:#1F497D'><img border=0 width=119 height=37 id="_x0000_i1026"
src="cid:image001.jpg@01CB7B47.BE1AE840" alt="cid:489575314@22072009-0ABB"></span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='color:#2D4D5E'> </span></b><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='color:#2D4D5E'>NICK CATON, E.I.T.</span></b><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:7.5pt;color:#CC9900'>PROJECT ENGINEER</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;color:#2D4D5E'>25501 west valley parkway</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;color:#2D4D5E'>olathe ks 66061</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;color:#2D4D5E'>direct 913 344.0036</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;color:#2D4D5E'>fax 913 345.0617</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><i><span
style='font-size:10.0pt;color:#2D4D5E'>Check out our new web-site @ </span></i><span
style='color:#1F497D'><a href="http://www.smithboucher.com" target="_blank"
title="blocked::www.smithboucher.com"><span style='font-size:10.0pt'>www.smithboucher.com</span></a></span><u><span
style='font-size:10.0pt;color:blue'> </span></u><o:p></o:p></p>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:10.0pt'>EIR-FPLR</span></b><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Takes
the U-name of a curve that adjusts the electric input ratio as a function of<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><span style='font-family:Symbol'>· </span><u>The part load
ratio (PLR)</u> – The PLR is defined as the ratio of the hourly load to
the hourly capacity; Load / Cap<sub>hour</sub><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><span style='font-family:Symbol'>· </span><u>The
evaporator/condenser dT</u> - The temperature differential between the
condenser and leaving chilled-water. The meaning of the condenser
temperature varies according to condenser type. <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:2.7pt'>For most chillers, the dT has a relatively small effect on
part-load performance. However, for variable-speed centrifugal chillers, the
effect of dT is as important as the PLR. This is because the pressure
rise across the impeller is proportional to the square of the impeller’s speed.
Unless some form on condenser temperature relief is employed to reduce the
temperature (and pressure) differential across the chiller at part load, the
performance of a variable-speed chiller may not be significantly different than
that of a constant-speed chiller.<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>To
model power consumption as a function of the PLR only, use a CURVE-FIT of TYPE
= QUADRATIC or CUBIC. To model as a function of both PLR and dT, use a
BI-QUADRATIC-RATIO&DT curve. <b><span style='color:red'>The curve must be
normalized to 1.0 at full load and the rated temperature differential. </span></b><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='color:red'>Note that, for centrifugal chillers, ‘full load’ is defined
as the ‘maximum capacity’, not the ‘design capacity’.</span></b> Refer to the
DESIGN-PLR keyword for more information.<o:p></o:p></p>
<p style='margin-bottom:12.0pt'> <o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><br>
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<br>
-- <br>
Carol Gardner PE<o:p></o:p></p>
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<br>
-- <br>
Carol Gardner PE<o:p></o:p></p>
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