Vikram,<br><br>One of the most common mistakes made when creating chiller curves is not normalizing them around the ARI rating points. This is required for all curves except for the new compressor curves.<br><br>This is the most helpful section of the documentation that I have found:<br>
<br>
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<h5>INDEPENDENT-2</h5>
<p class="MsoBodyText">Used for all <font style="background-color: rgb(49, 106, 197);" color="#ffffff">curves</font> 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.</p>
<p class="MsoBodyText"><b><span style="font-family: 'Arial','sans-serif';">Example
1</span></b>: defining a <font style="background-color: rgb(49, 106, 197);" color="#ffffff">curve</font> by inputting a set of data points.</p>
<p class="MsoBodyText">A packaged system (PZS) has cooling performance
significantly different from that used in the default model. The manufacturer
lists the data shown in <a>Table 46</a>,
for cooling capacity, at 2000 cfm design air flow rate, as a function of outside
dry-bulb temperature and entering wet-bulb temperature.</p>
<p style="margin-left: 0pt;" class="MsoCaption"><a name="_Ref490744804"></a><a name="_Ref490744859">Table </a>46 Cooling capacity (kBtu/hr) vs. temperature</p>
<div style="margin-top: 2pt; margin-bottom: 2pt;" align="center">
<table style="border: medium none; border-collapse: collapse;" class="MsoNormalTable" border="1" cellpadding="0" cellspacing="0">
<tbody>
<tr style="page-break-inside: avoid;">
<td style="border: 1pt solid windowtext; padding: 0pt 5.4pt; width: 72pt; background: none repeat scroll 0% 0% aqua;" rowspan="2" valign="top" width="120">
<p style="text-align: center; margin-top: 0pt;" class="TableData" align="center"><b>Outside<br>Dry-bulb</b></p></td>
<td style="border-width: 1pt 1pt medium medium; border-style: solid solid none none; border-color: windowtext windowtext -moz-use-text-color -moz-use-text-color; padding: 0pt 5.4pt; width: 216pt; background: none repeat scroll 0% 0% aqua;" colspan="3" valign="top" width="360">
<p style="text-align: center;" class="TableData" align="center"><b>Entering
Wet-bulb</b></p></td></tr>
<tr style="page-break-inside: avoid;">
<td style="border-width: medium medium 1pt; border-style: none none solid; border-color: -moz-use-text-color -moz-use-text-color windowtext; padding: 0pt 5.4pt; width: 72pt; background: none repeat scroll 0% 0% aqua;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center"><b>72F</b></p></td>
<td style="border-width: medium medium 1pt; border-style: none none solid; border-color: -moz-use-text-color -moz-use-text-color windowtext; padding: 0pt 5.4pt; width: 72pt; background: none repeat scroll 0% 0% aqua;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center"><b>67F</b></p></td>
<td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0pt 5.4pt; width: 72pt; background: none repeat scroll 0% 0% aqua;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center"><b>62F</b></p></td></tr>
<tr>
<td style="border-width: medium 1pt; border-style: none solid; border-color: -moz-use-text-color windowtext; padding: 0pt 5.4pt; width: 72pt;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center">85F</p></td>
<td style="border: medium none; padding: 0pt 5.4pt; width: 72pt;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center">69</p></td>
<td style="border: medium none; padding: 0pt 5.4pt; width: 72pt;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center">65</p></td>
<td style="border-width: medium 1pt medium medium; border-style: none solid none none; border-color: -moz-use-text-color windowtext -moz-use-text-color -moz-use-text-color; padding: 0pt 5.4pt; width: 72pt;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center">60</p></td></tr>
<tr>
<td style="border-width: medium 1pt; border-style: none solid; border-color: -moz-use-text-color windowtext; padding: 0pt 5.4pt; width: 72pt;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center">95F</p></td>
<td style="border: medium none; padding: 0pt 5.4pt; width: 72pt;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center">68</p></td>
<td style="border: medium none; padding: 0pt 5.4pt; width: 72pt;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center">63 (ARI)</p></td>
<td style="border-width: medium 1pt medium medium; border-style: none solid none none; border-color: -moz-use-text-color windowtext -moz-use-text-color -moz-use-text-color; padding: 0pt 5.4pt; width: 72pt;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center">57</p></td></tr>
<tr>
<td style="border-width: medium 1pt; border-style: none solid; border-color: -moz-use-text-color windowtext; padding: 0pt 5.4pt; width: 72pt;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center">105F</p></td>
<td style="border: medium none; padding: 0pt 5.4pt; width: 72pt;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center">65</p></td>
<td style="border: medium none; padding: 0pt 5.4pt; width: 72pt;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center">60</p></td>
<td style="border-width: medium 1pt medium medium; border-style: none solid none none; border-color: -moz-use-text-color windowtext -moz-use-text-color -moz-use-text-color; padding: 0pt 5.4pt; width: 72pt;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center">53</p></td></tr>
<tr>
<td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: -moz-use-text-color windowtext windowtext; padding: 0pt 5.4pt; width: 72pt;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center">115F</p></td>
<td style="border-width: medium medium 1pt; border-style: none none solid; border-color: -moz-use-text-color -moz-use-text-color windowtext; padding: 0pt 5.4pt; width: 72pt;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center">62</p></td>
<td style="border-width: medium medium 1pt; border-style: none none solid; border-color: -moz-use-text-color -moz-use-text-color windowtext; padding: 0pt 5.4pt; width: 72pt;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center">55</p></td>
<td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0pt 5.4pt; width: 72pt;" valign="top" width="120">
<p style="text-align: center; margin-bottom: 0pt;" class="TableData" align="center">49</p></td></tr></tbody></table></div>
<p class="MsoBodyText"> </p>
<p class="MsoBodyText">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 <font style="background-color: rgb(49, 106, 197);" color="#ffffff">curve</font> 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 <a>Table
47</a></p>
<p style="margin-left: 0pt;" class="MsoCaption"><a name="_Ref490745029">Table </a>47
Normalized capacity vs. temperature</p>
<div style="margin-top: 2pt; margin-bottom: 2pt;" align="center">
<table style="border: medium none; border-collapse: collapse;" class="MsoNormalTable" border="1" cellpadding="0" cellspacing="0">
<tbody>
<tr style="page-break-inside: avoid;">
<td style="border: 1pt solid windowtext; padding: 0pt 5.4pt; width: 72pt; background: none repeat scroll 0% 0% aqua;" rowspan="2" valign="top" width="120">
<p style="text-align: center; margin-top: 0pt;" class="TableData" align="center"><b>Outside<br>Dry-bulb</b></p></td>
<td style="border-width: 1pt 1pt medium medium; border-style: solid solid none none; border-color: windowtext windowtext -moz-use-text-color -moz-use-text-color; padding: 0pt 5.4pt; width: 216pt; background: none repeat scroll 0% 0% aqua;" colspan="3" valign="top" width="360">
<p style="text-align: center;" class="TableData" align="center"><b>Entering
Wet-bulb</b></p></td></tr>
<tr style="page-break-inside: avoid;">
<td style="border-width: medium medium 1pt; border-style: none none solid; border-color: -moz-use-text-color -moz-use-text-color windowtext; padding: 0pt 5.4pt; width: 72pt; background: none repeat scroll 0% 0% aqua;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center"><b>72F</b></p></td>
<td style="border-width: medium medium 1pt; border-style: none none solid; border-color: -moz-use-text-color -moz-use-text-color windowtext; padding: 0pt 5.4pt; width: 72pt; background: none repeat scroll 0% 0% aqua;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center"><b>67F</b></p></td>
<td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0pt 5.4pt; width: 72pt; background: none repeat scroll 0% 0% aqua;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center"><b>62F</b></p></td></tr>
<tr>
<td style="border-width: medium 1pt; border-style: none solid; border-color: -moz-use-text-color windowtext; padding: 0pt 5.4pt; width: 72pt;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center">85F</p></td>
<td style="border: medium none; padding: 0pt 5.4pt; width: 72pt;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center">1.095</p></td>
<td style="border: medium none; padding: 0pt 5.4pt; width: 72pt;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center">1.032</p></td>
<td style="border-width: medium 1pt medium medium; border-style: none solid none none; border-color: -moz-use-text-color windowtext -moz-use-text-color -moz-use-text-color; padding: 0pt 5.4pt; width: 72pt;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center">0.952</p></td></tr>
<tr>
<td style="border-width: medium 1pt; border-style: none solid; border-color: -moz-use-text-color windowtext; padding: 0pt 5.4pt; width: 72pt;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center">95F</p></td>
<td style="border: medium none; padding: 0pt 5.4pt; width: 72pt;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center">1.079</p></td>
<td style="border: medium none; padding: 0pt 5.4pt; width: 72pt;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center">1.0 (ARI)</p></td>
<td style="border-width: medium 1pt medium medium; border-style: none solid none none; border-color: -moz-use-text-color windowtext -moz-use-text-color -moz-use-text-color; padding: 0pt 5.4pt; width: 72pt;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center">0.905</p></td></tr>
<tr>
<td style="border-width: medium 1pt; border-style: none solid; border-color: -moz-use-text-color windowtext; padding: 0pt 5.4pt; width: 72pt;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center">105F</p></td>
<td style="border: medium none; padding: 0pt 5.4pt; width: 72pt;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center">1.032</p></td>
<td style="border: medium none; padding: 0pt 5.4pt; width: 72pt;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center">0.952</p></td>
<td style="border-width: medium 1pt medium medium; border-style: none solid none none; border-color: -moz-use-text-color windowtext -moz-use-text-color -moz-use-text-color; padding: 0pt 5.4pt; width: 72pt;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center">0.841</p></td></tr>
<tr>
<td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: -moz-use-text-color windowtext windowtext; padding: 0pt 5.4pt; width: 72pt;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center">115F</p></td>
<td style="border-width: medium medium 1pt; border-style: none none solid; border-color: -moz-use-text-color -moz-use-text-color windowtext; padding: 0pt 5.4pt; width: 72pt;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center">0.984</p></td>
<td style="border-width: medium medium 1pt; border-style: none none solid; border-color: -moz-use-text-color -moz-use-text-color windowtext; padding: 0pt 5.4pt; width: 72pt;" valign="top" width="120">
<p style="text-align: center;" class="TableData" align="center">0.873</p></td>
<td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0pt 5.4pt; width: 72pt;" valign="top" width="120">
<p style="text-align: center; margin-bottom: 0pt;" class="TableData" align="center">0.778</p></td></tr></tbody></table></div>
<p class="MsoBodyText"> </p>
<p class="MsoBodyText">The <font style="background-color: rgb(49, 106, 197);" color="#ffffff">CURVE-FIT</font> input will look like the following:</p>
<p class="DOE-2Input">CAP-<font style="background-color: rgb(49, 106, 197);" color="#ffffff">CURVE</font>-1 = <font style="background-color: rgb(49, 106, 197);" color="#ffffff">CURVE-FIT</font><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) ..</p>
<p class="MsoBodyText"><b><span style="font-family: 'Arial','sans-serif';">Example
2:</span></b> Defining a <font style="background-color: rgb(49, 106, 197);" color="#ffffff">curve</font> by inputting coefficients</p>
<p class="MsoBodyText">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 <font style="background-color: rgb(49, 106, 197);" color="#ffffff">curve</font> that
will give a constant efficiency. The <font style="background-color: rgb(49, 106, 197);" color="#ffffff">curve</font> TYPE is QUADRATIC in the part load ratio (PLR). PLR
correction <font style="background-color: rgb(49, 106, 197);" color="#ffffff">curves</font>
are always multiplied by the unit capacity, not the load, to obtain the energy
(fuel or electricity) use. Thus the <font style="background-color: rgb(49, 106, 197);" color="#ffffff">curve</font> we want is: 0.0 + 1.0*PLR + 0.0*PLR*PLR. The input
will look like:</p>
<p class="DOE-2Input">New-Furnace-HIR-fPLR = <font style="background-color: rgb(49, 106, 197);" color="#ffffff">CURVE-FIT</font><br>TYPE =
QUADRATIC<br>INPUT-TYPE = COEFFICIENTS<br>COEFFICIENTS =
(0.0,1.0,0.0) ..</p>
<p class="MsoBodyText">Then in the SYSTEM command we include:</p>
<p class="DOE-2Input"> FURNACE-HIR-FPLR = New-Furnace-HIR-fPLR</p>
</div><br>
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<p class="d2h_main_linknav" align="left"> </p></div></div></div>Try normalizing your dependent in the same way shown here and you should get very different output.<br><br>Carol<br><div style="padding: 5px 20px 10px 22px; background-color: transparent; width: 808px; height: 654px; overflow: auto; top: 0px;" id="nstext" class="d2h_main_nstext" valign="bottom">
<b><br></b></div><div class="gmail_quote">On Wed, Mar 9, 2011 at 5:19 PM, Paul Diglio <span dir="ltr"><<a href="mailto:paul.diglio@sbcglobal.net">paul.diglio@sbcglobal.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div><div style="font-family: times new roman,new york,times,serif; font-size: 10pt;">Vikram:<br><br>When defining a screw compressor in eQuest, I see three curves required.<br><br>1. EIR f(CHWT & ECT) which is the energy input ratio as a function of the evaporator leaving water temperature and the condenser water entering temperature. This is called lift. eQuest calls this DT.<br>
<br>2.Cap f(CHWT & ECT) which is the capacity as a function of lift.<br><br>3.EIR f(PLR & DT) which is the energy input ratio as a function of the part load ratio and the DT or chiller lift. <br><br>Creating a performance curve using the temperature difference between the condenser water entering and leaving temperature is incorrect. I think you realize this because your chiller energy went up 30%.<br>
<br>If you are modeling a constant chilled water supply
temperature you can plug that in as Independent 1 and use the condenser entering water temperature as Independent 2. If your chilled water temperature will be reset based on terminal load or outside air temperature, then you would need to get the chiller modeled by the manufacturer.<br>
<br>Paul Diglio<br><div><br></div><div style="font-family: times new roman,new york,times,serif; font-size: 10pt;"><br><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><font size="2" face="Tahoma"><hr size="1">
<b><span style="font-weight: bold;">From:</span></b> "Sami, Vikram" <<a href="mailto:Vikram.Sami@perkinswill.com" target="_blank">Vikram.Sami@perkinswill.com</a>><br><b><span style="font-weight: bold;">To:</span></b> "<a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a>" <<a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a>><br>
<b><span style="font-weight: bold;">Sent:</span></b> Wed, March 9, 2011 6:54:13 PM<div class="im"><br><b><span style="font-weight: bold;">Subject:</span></b> [Equest-users] Chiller curve ball<br></div></font><div><div></div>
<div class="h5"><br>
<div>
<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 style="width: 384pt; border-collapse: collapse;" border="0" cellpadding="0" cellspacing="0" width="512">
<tbody><tr style="min-height: 40.5pt;">
<td style="width: 47.35pt; border: 1pt solid windowtext; padding: 0in 5.4pt; min-height: 40.5pt;" width="63">
<p class="MsoNormal" style="text-align: center;" align="center"><a rel="nofollow"><b><span style="font-size: 10pt; color: black;">Load % </span></b></a><b> </b><b></b></p>
</td>
<td style="width: 47.75pt; border-width: 1pt 1pt 1pt medium; border-style: solid solid solid none; border-color: windowtext windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 40.5pt;" width="64">
<p class="MsoNormal" style="text-align: center;" align="center"><b> </b><b><span style="font-size: 10pt; color: black;">Capacity (Tons) </span></b><b> </b></p>
</td>
<td style="width: 47.5pt; border-width: 1pt 1pt 1pt medium; border-style: solid solid solid none; border-color: windowtext windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 40.5pt;" width="63">
<p class="MsoNormal" style="text-align: center;" align="center"><b> </b><b><span style="font-size: 10pt; color: black;">Cond. EWT (°F) </span></b><b> </b></p>
</td>
<td style="width: 47.5pt; border-width: 1pt 1pt 1pt medium; border-style: solid solid solid none; border-color: windowtext windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 40.5pt;" width="63">
<p class="MsoNormal" style="text-align: center;" align="center"><b> </b><b><span style="font-size: 10pt; color: black;">Cond. LWT (°F) </span></b><b> </b></p>
</td>
<td style="width: 51.2pt; border-width: 1pt 1pt 1pt medium; border-style: solid solid solid none; border-color: windowtext windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 40.5pt;" width="68">
<p class="MsoNormal" style="text-align: center;" align="center"><b> </b><b><span style="font-size: 10pt; color: black;">Compressor kW </span></b><b> </b></p>
</td>
<td style="width: 47.4pt; border-width: 1pt 1pt 1pt medium; border-style: solid solid solid none; border-color: windowtext windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 40.5pt;" width="63">
<p class="MsoNormal" style="text-align: center;" align="center"><b>EER</b></p>
</td>
<td style="width: 47.4pt; border-width: 1pt 1pt 1pt medium; border-style: solid solid solid none; border-color: windowtext windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 40.5pt;" width="63">
<p class="MsoNormal" style="text-align: center;" align="center"><b>COP</b></p>
</td>
<td style="width: 47.9pt; border-width: 1pt 1pt 1pt medium; border-style: solid solid solid none; border-color: windowtext windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 40.5pt;" width="64">
<p class="MsoNormal" style="text-align: center;" align="center"><b>EIR</b></p>
</td>
</tr>
<tr style="min-height: 15pt;">
<td style="width: 47.35pt; border-width: medium 1pt 1pt; border-style: none solid solid; border-color: -moz-use-text-color windowtext windowtext; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="63">
<p class="MsoNormal" style="text-align: right;" align="right">100</p>
</td>
<td style="width: 47.75pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="64">
<p class="MsoNormal" style="text-align: right;" align="right">135.8</p>
</td>
<td style="width: 47.5pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="63">
<p class="MsoNormal" style="text-align: right;" align="right">85</p>
</td>
<td style="width: 47.5pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="63">
<p class="MsoNormal" style="text-align: right;" align="right">95</p>
</td>
<td style="width: 51.2pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="68">
<p class="MsoNormal" style="text-align: right;" align="right">104.1</p>
</td>
<td style="width: 47.4pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="63">
<p class="MsoNormal" style="text-align: right;" align="right">15.6</p>
</td>
<td style="width: 47.4pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="63">
<p class="MsoNormal" style="text-align: right;" align="right"><span style="color: black;">4.6</span></p>
</td>
<td style="width: 47.9pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="64">
<p class="MsoNormal" style="text-align: right;" align="right"><span style="color: black;">0.217391</span></p>
</td>
</tr>
<tr style="min-height: 15pt;">
<td style="width: 47.35pt; border-width: medium 1pt 1pt; border-style: none solid solid; border-color: -moz-use-text-color windowtext windowtext; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="63">
<p class="MsoNormal" style="text-align: right;" align="right">83.3</p>
</td>
<td style="width: 47.75pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="64">
<p class="MsoNormal" style="text-align: right;" align="right">116.8</p>
</td>
<td style="width: 47.5pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="63">
<p class="MsoNormal" style="text-align: right;" align="right">79.4</p>
</td>
<td style="width: 47.5pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="63">
<p class="MsoNormal" style="text-align: right;" align="right">87.9</p>
</td>
<td style="width: 51.2pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="68">
<p class="MsoNormal" style="text-align: right;" align="right">81</p>
</td>
<td style="width: 47.4pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="63">
<p class="MsoNormal" style="text-align: right;" align="right">17.3</p>
</td>
<td style="width: 47.4pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="63">
<p class="MsoNormal" style="text-align: right;" align="right"><span style="color: black;">5.1</span></p>
</td>
<td style="width: 47.9pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="64">
<p class="MsoNormal" style="text-align: right;" align="right"><span style="color: black;">0.196078</span></p>
</td>
</tr>
<tr style="min-height: 15pt;">
<td style="width: 47.35pt; border-width: medium 1pt 1pt; border-style: none solid solid; border-color: -moz-use-text-color windowtext windowtext; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="63">
<p class="MsoNormal" style="text-align: right;" align="right">66.7</p>
</td>
<td style="width: 47.75pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="64">
<p class="MsoNormal" style="text-align: right;" align="right">96.9</p>
</td>
<td style="width: 47.5pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="63">
<p class="MsoNormal" style="text-align: right;" align="right">73.5</p>
</td>
<td style="width: 47.5pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="63">
<p class="MsoNormal" style="text-align: right;" align="right">80.4</p>
</td>
<td style="width: 51.2pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="68">
<p class="MsoNormal" style="text-align: right;" align="right">60.1</p>
</td>
<td style="width: 47.4pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="63">
<p class="MsoNormal" style="text-align: right;" align="right">19.3</p>
</td>
<td style="width: 47.4pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="63">
<p class="MsoNormal" style="text-align: right;" align="right"><span style="color: black;">5.7</span></p>
</td>
<td style="width: 47.9pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="64">
<p class="MsoNormal" style="text-align: right;" align="right"><span style="color: black;">0.175439</span></p>
</td>
</tr>
<tr style="min-height: 15pt;">
<td style="width: 47.35pt; border-width: medium 1pt 1pt; border-style: none solid solid; border-color: -moz-use-text-color windowtext windowtext; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="63">
<p class="MsoNormal" style="text-align: right;" align="right">50</p>
</td>
<td style="width: 47.75pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="64">
<p class="MsoNormal" style="text-align: right;" align="right">73.5</p>
</td>
<td style="width: 47.5pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="63">
<p class="MsoNormal" style="text-align: right;" align="right">66.7</p>
</td>
<td style="width: 47.5pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="63">
<p class="MsoNormal" style="text-align: right;" align="right">71.8</p>
</td>
<td style="width: 51.2pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="68">
<p class="MsoNormal" style="text-align: right;" align="right">41.7</p>
</td>
<td style="width: 47.4pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="63">
<p class="MsoNormal" style="text-align: right;" align="right">21.2</p>
</td>
<td style="width: 47.4pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="63">
<p class="MsoNormal" style="text-align: right;" align="right"><span style="color: black;">6.2</span></p>
</td>
<td style="width: 47.9pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="64">
<p class="MsoNormal" style="text-align: right;" align="right"><span style="color: black;">0.16129</span></p>
</td>
</tr>
<tr style="min-height: 15pt;">
<td style="width: 47.35pt; border-width: medium 1pt 1pt; border-style: none solid solid; border-color: -moz-use-text-color windowtext windowtext; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="63">
<p class="MsoNormal" style="text-align: right;" align="right">33.3</p>
</td>
<td style="width: 47.75pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="64">
<p class="MsoNormal" style="text-align: right;" align="right">48.2</p>
</td>
<td style="width: 47.5pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="63">
<p class="MsoNormal" style="text-align: right;" align="right">65</p>
</td>
<td style="width: 47.5pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="63">
<p class="MsoNormal" style="text-align: right;" align="right">68.4</p>
</td>
<td style="width: 51.2pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="68">
<p class="MsoNormal" style="text-align: right;" align="right">26.6</p>
</td>
<td style="width: 47.4pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="63">
<p class="MsoNormal" style="text-align: right;" align="right">21.7</p>
</td>
<td style="width: 47.4pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="63">
<p class="MsoNormal" style="text-align: right;" align="right"><span style="color: black;">6.4</span></p>
</td>
<td style="width: 47.9pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="64">
<p class="MsoNormal" style="text-align: right;" align="right"><span style="color: black;">0.15625</span></p>
</td>
</tr>
<tr style="min-height: 15pt;">
<td style="width: 47.35pt; border-width: medium 1pt 1pt; border-style: none solid solid; border-color: -moz-use-text-color windowtext windowtext; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="63">
<p class="MsoNormal" style="text-align: right;" align="right">16.7</p>
</td>
<td style="width: 47.75pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="64">
<p class="MsoNormal" style="text-align: right;" align="right">23.6</p>
</td>
<td style="width: 47.5pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="63">
<p class="MsoNormal" style="text-align: right;" align="right">65</p>
</td>
<td style="width: 47.5pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="63">
<p class="MsoNormal" style="text-align: right;" align="right">66.6</p>
</td>
<td style="width: 51.2pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="68">
<p class="MsoNormal" style="text-align: right;" align="right">13.1</p>
</td>
<td style="width: 47.4pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="63">
<p class="MsoNormal" style="text-align: right;" align="right">21.7</p>
</td>
<td style="width: 47.4pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="63">
<p class="MsoNormal" style="text-align: right;" align="right"><span style="color: black;">6.4</span></p>
</td>
<td style="width: 47.9pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0in 5.4pt; min-height: 15pt;" nowrap valign="bottom" width="64">
<p class="MsoNormal" style="text-align: right;" align="right"><span style="color: black;">0.15625</span></p>
</td>
</tr>
</tbody></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><span>1.<span style="font: 7pt "Times New Roman";">
</span></span>A curve that defines the EIR based on the condenser
water temp</p>
<p class="MsoNormal" style="margin-left: 1in;"><span style="color: rgb(192, 0, 0);">"York
- Temp vs EIR" = CURVE-FIT </span></p>
<p class="MsoNormal" style="margin-left: 1in;"><span style="color: rgb(192, 0, 0);">
TYPE = BI-QUADRATIC-T</span></p>
<p class="MsoNormal" style="margin-left: 1in;"><span style="color: rgb(192, 0, 0);">
INPUT-TYPE = DATA</span></p>
<p class="MsoNormal" style="margin-left: 1in;"><span style="color: rgb(192, 0, 0);">
INDEPENDENT-1 = ( 85, 79.4, 73.5, 66.7, 65, 65 )</span></p>
<p class="MsoNormal" style="margin-left: 1in;"><span style="color: rgb(192, 0, 0);">
INDEPENDENT-2 = ( 95, 87.9, 80.4, 71.8, 68.4, 66 )</span></p>
<p class="MsoNormal" style="margin-left: 1in;"><span style="color: rgb(192, 0, 0);">
DEPENDENT = ( 0.217391, 0.196, 0.175, 0.161, 0.156, 0.156 )</span></p>
<p class="MsoNormal" style="margin-left: 1in;"><span style="color: rgb(192, 0, 0);"> ..</span></p>
<p><span>2.<span style="font: 7pt "Times New Roman";">
</span></span>A curve that defines the part load based on the condenser
water temp</p>
<p class="MsoNormal" style="margin-left: 1in;"><span style="color: rgb(192, 0, 0);">"York
Temp vs Part Load" = CURVE-FIT </span></p>
<p class="MsoNormal" style="margin-left: 1in;"><span style="color: rgb(192, 0, 0);">
TYPE = BI-QUADRATIC-T</span></p>
<p class="MsoNormal" style="margin-left: 1in;"><span style="color: rgb(192, 0, 0);">
INPUT-TYPE = DATA</span></p>
<p class="MsoNormal" style="margin-left: 1in;"><span style="color: rgb(192, 0, 0);">
INDEPENDENT-1 = ( 85, 79.4, 73.5, 66.7, 65, 65 )</span></p>
<p class="MsoNormal" style="margin-left: 1in;"><span style="color: rgb(192, 0, 0);">
INDEPENDENT-2 = ( 95, 87.9, 80.4, 71.8, 68.4, 66 )</span></p>
<p class="MsoNormal" style="margin-left: 1in;"><span style="color: rgb(192, 0, 0);">
DEPENDENT = ( 1, 0.833, 0.667, 0.5, 0.333, 0.167 )</span></p>
<p class="MsoNormal" style="margin-left: 1in;"><span style="color: rgb(192, 0, 0);"> ..</span></p>
<p><span>3.<span style="font: 7pt "Times New Roman";">
</span></span>A curve that defines the EIR based on the part load.</p>
<p class="MsoNormal" style="margin-left: 1in;"><span style="color: rgb(192, 0, 0);">"York
Part Load vs EIR" = CURVE-FIT </span></p>
<p class="MsoNormal" style="margin-left: 1in;"><span style="color: rgb(192, 0, 0);">
TYPE = QUADRATIC</span></p>
<p class="MsoNormal" style="margin-left: 1in;"><span style="color: rgb(192, 0, 0);">
INPUT-TYPE = DATA</span></p>
<p class="MsoNormal" style="margin-left: 1in;"><span style="color: rgb(192, 0, 0);">
INDEPENDENT = ( 1, 0.833, 0.667, 0.5, 0.333, 0.167 )</span></p>
<p class="MsoNormal" style="margin-left: 1in;"><span style="color: rgb(192, 0, 0);">
DEPENDENT = ( 0.217, 0.196, 0.175, 0.161, 0.156, 0.156 )</span></p>
<p class="MsoNormal" style="margin-left: 1in;"><span style="color: rgb(192, 0, 0);"> ..</span></p>
<p class="MsoNormal" style="margin-left: 1in;"> </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?</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Muchas Gracias in advance</p>
<p class="MsoNormal"><b><span style="font-size: 10pt; color: rgb(220, 170, 44);">We've
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<p class="MsoNormal"><b><span style="font-size: 9pt; color: gray;">Vikram Sami</span></b><span style="font-size: 9pt; color: gray;">, LEED AP
BD+C</span></p>
<p class="MsoNormal"><span style="font-size: 9pt; color: gray;">Sustainable Design Analyst</span></p>
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about our </span><b><span style="font-size: 9pt; color: rgb(44, 162, 196);"><a rel="nofollow" href="http://2030e2.perkinswill.com/" target="_blank"><span style="color: rgb(44, 162, 196);">2030 Challenge Estimating + Evaluation</span></a></span></b><span style="font-size: 9pt; color: gray;"> tool for
fossil fuel free buildings </span></p>
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<br></blockquote></div><br><br clear="all"><br>-- <br>Carol Gardner PE<br>
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