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--></style></head><body lang="EN-US" link="blue" vlink="purple"><div class="WordSection1"><p class="MsoNormal"><span style="color:#1F497D">You’ll need to get more data than this for the custom curve to work well – I think you can find some fairly recent discussion on one of the lists, but the sample data from York only shows one load point at each ECWT, therefore the eQuest curve won’t be accurate anytime that the load and ECWT don’t match your data.</span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p><p class="MsoNormal"><span style="color:#1F497D">You’d prefer to have load and ECWT data in a matrix around all of these points – i.e. several load and kW data points at 85F ECWT, 75F ECWT, 65F ECWT.</span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p><div><p class="MsoNormal"><span style="color:#1F497D">My first suggestions is to try using report variables to show kW and chiller production while using the default curves. See if when conditions specified below occur there is a reasonable match to the York data kW/ton.</span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p><p class="MsoNormal"><span style="color:#1F497D">If yes, use the defaults. If no, ask York for more data.</span></p><p class="MsoNormal"><span style="color:#1F497D"> </span></p>
<p class="MsoNormal"><u><span style="color:black"> </span></u><span style="color:#1F497D"></span></p><p class="MsoNormal"><span style="font-size:8.0pt;color:black"> </span><span style="color:#1F497D"></span></p>
<p class="MsoNormal"><span style="color:#1F497D">David S. Eldridge, Jr., P.E., LEED AP BD+C, BEMP, BEAP, HBDP</span><span style="color:#1F497D"></span></p><p class="MsoNormal"><b><span style="color:#244061">Grumman/Butkus Associates</span></b><span style="color:#1F497D"></span></p>
<p class="MsoNormal"><u><span style="color:black"> </span></u><span style="color:#1F497D"></span></p><p class="MsoNormal"><span style="color:black"> </span><span style="color:#1F497D"></span></p>
</div><p class="MsoNormal"><span style="color:#1F497D"> </span></p><div><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""> <a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a> [mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>Sami, Vikram<br>
<b>Sent:</b> Wednesday, March 09, 2011 5:54 PM<br><b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> [Equest-users] Chiller curve ball</span></p></div>
</div><p class="MsoNormal"> </p><p class="MsoNormal">Ok – so I’m probably doing this all wrong. </p><p class="MsoNormal"> </p><p class="MsoNormal">I am trying to model a York scroll chiller in EQUEST. The table below illustrates the Part Load rating Data</p>
<p class="MsoNormal"> </p><table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" width="512" style="width:384.0pt;margin-left:-1.15pt;border-collapse:collapse"><tr style="height:40.5pt"><td width="63" style="width:47.35pt;border:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt;height:40.5pt">
<p class="MsoNormal" align="center" style="text-align:center"><a name="RANGE!C3:J9"><b><span style="font-size:10.0pt;color:black">Load % </span></b></a><b> </b></p></td><td width="64" style="width:47.75pt;border:solid windowtext 1.0pt;border-left:none;padding:0in 5.4pt 0in 5.4pt;height:40.5pt">
<p class="MsoNormal" align="center" style="text-align:center"><b> </b><b><span style="font-size:10.0pt;color:black">Capacity (Tons) </span> </b></p></td><td width="63" style="width:47.5pt;border:solid windowtext 1.0pt;border-left:none;padding:0in 5.4pt 0in 5.4pt;height:40.5pt">
<p class="MsoNormal" align="center" style="text-align:center"><b> </b><b><span style="font-size:10.0pt;color:black">Cond. EWT (°F) </span> </b></p></td><td width="63" style="width:47.5pt;border:solid windowtext 1.0pt;border-left:none;padding:0in 5.4pt 0in 5.4pt;height:40.5pt">
<p class="MsoNormal" align="center" style="text-align:center"><b> </b><b><span style="font-size:10.0pt;color:black">Cond. LWT (°F) </span> </b></p></td><td width="68" style="width:51.2pt;border:solid windowtext 1.0pt;border-left:none;padding:0in 5.4pt 0in 5.4pt;height:40.5pt">
<p class="MsoNormal" align="center" style="text-align:center"><b> </b><b><span style="font-size:10.0pt;color:black">Compressor kW </span> </b></p></td><td width="63" style="width:47.4pt;border:solid windowtext 1.0pt;border-left:none;padding:0in 5.4pt 0in 5.4pt;height:40.5pt">
<p class="MsoNormal" align="center" style="text-align:center"><b>EER</b></p></td><td width="63" style="width:47.4pt;border:solid windowtext 1.0pt;border-left:none;padding:0in 5.4pt 0in 5.4pt;height:40.5pt"><p class="MsoNormal" align="center" style="text-align:center">
<b>COP</b></p></td><td width="64" style="width:47.9pt;border:solid windowtext 1.0pt;border-left:none;padding:0in 5.4pt 0in 5.4pt;height:40.5pt"><p class="MsoNormal" align="center" style="text-align:center"><b>EIR</b></p></td>
</tr><tr style="height:15.0pt"><td width="63" nowrap valign="bottom" style="width:47.35pt;border:solid windowtext 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt;height:15.0pt"><p class="MsoNormal" align="right" style="text-align:right">
100</p></td><td width="64" nowrap valign="bottom" style="width:47.75pt;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;height:15.0pt"><p class="MsoNormal" align="right" style="text-align:right">
135.8</p></td><td width="63" nowrap valign="bottom" style="width:47.5pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right">85</p></td><td width="63" nowrap valign="bottom" style="width:47.5pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right">95</p></td><td width="68" nowrap valign="bottom" style="width:51.2pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right">104.1</p></td><td width="63" nowrap valign="bottom" style="width:47.4pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right">15.6</p></td><td width="63" nowrap valign="bottom" style="width:47.4pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="color:black">4.6</span></p></td><td width="64" nowrap valign="bottom" style="width:47.9pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="color:black">0.217391</span></p></td></tr><tr style="height:15.0pt"><td width="63" nowrap valign="bottom" style="width:47.35pt;border:solid windowtext 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right">83.3</p></td><td width="64" nowrap valign="bottom" style="width:47.75pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right">116.8</p></td><td width="63" nowrap valign="bottom" style="width:47.5pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right">79.4</p></td><td width="63" nowrap valign="bottom" style="width:47.5pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right">87.9</p></td><td width="68" nowrap valign="bottom" style="width:51.2pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right">81</p></td><td width="63" nowrap valign="bottom" style="width:47.4pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right">17.3</p></td><td width="63" nowrap valign="bottom" style="width:47.4pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="color:black">5.1</span></p></td><td width="64" nowrap valign="bottom" style="width:47.9pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="color:black">0.196078</span></p></td></tr><tr style="height:15.0pt"><td width="63" nowrap valign="bottom" style="width:47.35pt;border:solid windowtext 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right">66.7</p></td><td width="64" nowrap valign="bottom" style="width:47.75pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right">96.9</p></td><td width="63" nowrap valign="bottom" style="width:47.5pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right">73.5</p></td><td width="63" nowrap valign="bottom" style="width:47.5pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right">80.4</p></td><td width="68" nowrap valign="bottom" style="width:51.2pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right">60.1</p></td><td width="63" nowrap valign="bottom" style="width:47.4pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right">19.3</p></td><td width="63" nowrap valign="bottom" style="width:47.4pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="color:black">5.7</span></p></td><td width="64" nowrap valign="bottom" style="width:47.9pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="color:black">0.175439</span></p></td></tr><tr style="height:15.0pt"><td width="63" nowrap valign="bottom" style="width:47.35pt;border:solid windowtext 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right">50</p></td><td width="64" nowrap valign="bottom" style="width:47.75pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right">73.5</p></td><td width="63" nowrap valign="bottom" style="width:47.5pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right">66.7</p></td><td width="63" nowrap valign="bottom" style="width:47.5pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right">71.8</p></td><td width="68" nowrap valign="bottom" style="width:51.2pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right">41.7</p></td><td width="63" nowrap valign="bottom" style="width:47.4pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right">21.2</p></td><td width="63" nowrap valign="bottom" style="width:47.4pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="color:black">6.2</span></p></td><td width="64" nowrap valign="bottom" style="width:47.9pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="color:black">0.16129</span></p></td></tr><tr style="height:15.0pt"><td width="63" nowrap valign="bottom" style="width:47.35pt;border:solid windowtext 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right">33.3</p></td><td width="64" nowrap valign="bottom" style="width:47.75pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right">48.2</p></td><td width="63" nowrap valign="bottom" style="width:47.5pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right">65</p></td><td width="63" nowrap valign="bottom" style="width:47.5pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right">68.4</p></td><td width="68" nowrap valign="bottom" style="width:51.2pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right">26.6</p></td><td width="63" nowrap valign="bottom" style="width:47.4pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right">21.7</p></td><td width="63" nowrap valign="bottom" style="width:47.4pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="color:black">6.4</span></p></td><td width="64" nowrap valign="bottom" style="width:47.9pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="color:black">0.15625</span></p></td></tr><tr style="height:15.0pt"><td width="63" nowrap valign="bottom" style="width:47.35pt;border:solid windowtext 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right">16.7</p></td><td width="64" nowrap valign="bottom" style="width:47.75pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right">23.6</p></td><td width="63" nowrap valign="bottom" style="width:47.5pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right">65</p></td><td width="63" nowrap valign="bottom" style="width:47.5pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right">66.6</p></td><td width="68" nowrap valign="bottom" style="width:51.2pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right">13.1</p></td><td width="63" nowrap valign="bottom" style="width:47.4pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right">21.7</p></td><td width="63" nowrap valign="bottom" style="width:47.4pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="color:black">6.4</span></p></td><td width="64" nowrap valign="bottom" style="width:47.9pt;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;height:15.0pt">
<p class="MsoNormal" align="right" style="text-align:right"><span style="color:black">0.15625</span></p></td></tr></table><p class="MsoNormal"> </p><p class="MsoNormal">eQUEST doesn’t seem to have a scroll chiller option – I assume screw is the closest thing to it. </p>
<p class="MsoNormal"> </p><p class="MsoNormal">As far as I can tell – you need to define 3 performance curves:</p><p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman""> </span></span>A curve that defines the EIR based on the condenser water temp</p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman""> </span></span>A curve that defines the part load based on the condenser water temp</p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman""> </span></span>A curve that defines the EIR based on the part load.</p>
<p class="MsoNormal" style="margin-left:1.0in"> </p><p class="MsoNormal"> </p><p class="MsoNormal">When I apply these curves to my chiller, my cooling energy goes up by 30%. Seems like a lot. Is this reasonable or am I doing something wrong with my curve selection?<span style="color:#1F497D"></span></p>
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