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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>Thanks to all for the feedback. It seems all are in agreement that I need more data points, and also data points at CHW supply temperatures other than 44 F, even if other CHW temperatures are not supplied. A follow up question then, is where in e-Quest would you enter 20 (or even 9 ) data points? When I look into constructing a curve there are only 4 possible entries for dependant, delta T and independent data points.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>To give this some context, I am trying to model Smardt chillers which are marketed to have superior part load performance which I am not sure is being captured by the default library chiller curves.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Thanks again for your help.<o:p></o:p></span></p><div><p class=MsoNormal><span style='font-family:"Times New Roman","serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Times New Roman","serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-family:"Times New Roman","serif";color:#28AAE1'>Afaan Naqvi </span></b><b><span style='font-family:"Times New Roman","serif";color:gray'> </span></b><span style='font-size:10.0pt;font-family:"Times New Roman","serif";color:gray'>PE LEED AP</span><b><span style='font-family:"Times New Roman","serif";color:#28AAE1'><o:p></o:p></span></b></p></div><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></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"'> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Nick Caton<br><b>Sent:</b> Wednesday, January 19, 2011 9:01 AM<br><b>To:</b> David Eldridge; equest-users@lists.onebuilding.org<br><b>Subject:</b> Re: [Equest-users] Constructing chiller part load curves<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='color:#1F497D'>Hi Afaan,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>The first table below contains the <u>sort</u> of information you will need to make a centrifugal EIR curve, but as David says you’re lacking in the minimum # of data points. I believe the bare minimum to extrapolate an accurate bi-quadratic curve would require 9 rows of data (minimum 3 PLR’s for a minimum 3 dT’s), though you should probably use the maximum number of data entry points permitted when allowing eQuest to determine the coefficients (20 per curve). <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>dT is simply the difference between the chilled and condenser water temps.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>I’m not sure exactly what we’re looking at in the second table, but it doesn’t look like data for creating a curve... If you want to make CAP-FT and EIR-FT curves (and if you don’t, that’s okay too – see below) you’ll need a rep who understands and can provide you with “maximum capacity” (not the designed capacity, or where PLR = 1.0) and power drawn under different conditions. I’ve previously selected 5 CW temps and 4 CHW temps around and including the design conditions being normalized to, totaling the maximum 20 data entry points we’re permitted to input. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>The attached email contains an overview of materials you should review to understand the process of custom chiller curve creation (includes a reference to the same EDR guideline David brings up below). Once you feel comfortable understanding the required data collection described towards the end of the referenced EDR chapter, you might do well to also read through a fairly lengthy discussion on this list that I started: “Chiller Curves (oh boy!).” There, I eventually provided an illustrated breakdown of each default curve and its function/implications, eventually realizing and providing visuals of their combined effects analogous to what equipment reps often provide for “chiller efficiency curves.” You should be able to follow this discussion from start to finish, and should come away knowing exactly what eQuest is doing “under the hood” moving forward. Carol Gardner also provided a writeup within that discussion that is similar to the EDR… oh I see she just posted it again =)!<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>One final suggestion: Your collected data suggests a possible pitfall – if you want to make the CAP-FT and EIR-FT curves, you MUST gather data for multiple CHW temps, even if the design should only ever call for 44 degree water to be produced. If you don’t understand why, then honestly you need further review of what the curves are functionally doing – see suggested reading above and attached. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>If you and your reps are struggling with producing the data required to make CAP-FT and EIR-FT curves, it’s advisable to stick with the defaults, and ensure your custom EIR-fPLR&dT curve entries are all normalized to ARI rather than a design condition.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Best of luck!<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>~Nick<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal><span style='color:#1F497D'><img width=119 height=37 id="Picture_x0020_1" src="cid:image001.jpg@01CBB7B9.8CAF69D0" alt="cid:489575314@22072009-0ABB"></span><b><span style='font-family:"Stylus BT","sans-serif";color:#2D4D5E'><o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-family:"Stylus BT","sans-serif";color:#2D4D5E'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-family:"Stylus BT","sans-serif";color:#2D4D5E'>NICK CATON, E.I.T.</span></b><b><span style='font-size:12.0pt;font-family:"Stylus BT","sans-serif";color:#2D4D5E'><o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:7.5pt;color:#CC9900'>PROJECT ENGINEER<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>Smith & Boucher Engineers</span><span style='font-size:7.5pt;font-family:"Times New Roman","serif";color:#CC9900'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>25501 west valley parkway<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>olathe ks 66061<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>direct 913 344.0036<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>fax 913 345.0617<o:p></o:p></span></p><p class=MsoNormal><span style='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;color:blue'> </span></u><span style='color:#1F497D'><o:p></o:p></span></p></div><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></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"'> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>David Eldridge<br><b>Sent:</b> Wednesday, January 19, 2011 7:38 AM<br><b>To:</b> equest-users@lists.onebuilding.org<br><b>Subject:</b> Re: [Equest-users] Constructing chiller part load curves<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='color:black'>You may want to run through this document before you get too much further. Skip ahead to “Part 2” of the document.</span><o:p></o:p></p><p class=MsoNormal><span style='color:black'> </span><o:p></o:p></p><p class=MsoNormal><a href="http://www.energydesignresources.com/media/2654/EDR_DesignGuidelines_%20HVAC_Simulation.pdf">http://www.energydesignresources.com/media/2654/EDR_DesignGuidelines_%20HVAC_Simulation.pdf</a><o:p></o:p></p><p class=MsoNormal><span style='color:black'> </span><o:p></o:p></p><p class=MsoNormal><span style='color:black'>In a nutshell – you should acquire a few more data points to develop a more comprehensive matrix. Right now your matrix would be equivalent to a line through the middle of possible conditions, you need to extend your data set over a wider range of water temperatures and load conditions.</span><o:p></o:p></p><p class=MsoNormal><span style='color:black'> </span><o:p></o:p></p><p class=MsoNormal><span style='color:black'>David</span><o:p></o:p></p><p class=MsoNormal><span style='color:black'> </span><o:p></o:p></p><div><p class=MsoNormal><u><span style='color:black'> </span></u><o:p></o:p></p><p class=MsoNormal><span style='font-size:8.0pt;color:black'> </span><o:p></o:p></p><p class=MsoNormal><b><span style='color:#1F497D'>David S. Eldridge, Jr.</span><span style='color:#244061'>, P</span><span style='color:#1F497D'>.</span><span style='color:#244061'>E</span><span style='color:#1F497D'>.</span><span style='color:#244061'>, LEED AP BD+C, BEMP, HBDP</span></b><o:p></o:p></p><p class=MsoNormal><span style='color:#1F497D'>Project Manager</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:4.0pt;color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><span style='color:#365F91'>Direct: (847) 316-92</span><span style='color:#1F497D'>24</span><span style='color:#365F91'> | Fax: (</span><span style='color:#1F497D'>847</span><span style='color:#365F91'>) </span><span style='color:#1F497D'>328</span><span style='color:#365F91'>-</span><span style='color:#1F497D'>4550</span><o:p></o:p></p><p class=MsoNormal><span style='color:black'><a href="http://www.grummanbutkus.com">http://www.grummanbutkus.com</a></span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><b><span style='color:#244061'>Grumman/Butkus Associates</span></b><span style='color:gray'> </span><span style='color:#365F91'>| 820 Davis Street, Suite 300 | Evanston, IL 60201</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:9.0pt;color:gray'>Energy Efficiency Consultants and Sustainable Design Engineers</span><o:p></o:p></p><p class=MsoNormal><u><span style='color:black'> </span></u><o:p></o:p></p></div><p class=MsoNormal><span style='color:black'> </span><o:p></o:p></p><div style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt'><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>Afaan Naqvi<br><b>Sent:</b> Tuesday, January 18, 2011 8:33 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] Constructing chiller part load curves</span><o:p></o:p></p></div></div><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>After browsing the forums, it seems there are many users that have constructed custom chiller curves based on selection data. I believe I have all the data I need to do this, but am coming up with polynomial coefficients and hourly results that do not make sense at all. Can someone please walk me through how to go about building the 3 curves for a centrifugal, water cooled chiller with a VSD based on the following data:<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width=808 style='width:485.0pt;margin-left:-.55pt;border-collapse:collapse'><tr style='height:13.2pt'><td width=80 nowrap style='width:48.0pt;border:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt;height:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>% Load</span><o:p></o:p></p></td><td width=113 nowrap style='width:68.0pt;border:solid windowtext 1.0pt;border-left:none;padding:0in 5.4pt 0in 5.4pt;height:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Capacity</span><o:p></o:p></p></td><td width=80 nowrap style='width:48.0pt;border:solid windowtext 1.0pt;border-left:none;padding:0in 5.4pt 0in 5.4pt;height:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>kW in</span><o:p></o:p></p></td><td width=80 nowrap style='width:48.0pt;border:solid windowtext 1.0pt;border-left:none;padding:0in 5.4pt 0in 5.4pt;height:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Perf</span><o:p></o:p></p></td><td width=108 nowrap style='width:65.0pt;border:solid windowtext 1.0pt;border-left:none;padding:0in 5.4pt 0in 5.4pt;height:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Evap T in</span><o:p></o:p></p></td><td width=120 nowrap style='width:1.0in;border:solid windowtext 1.0pt;border-left:none;padding:0in 5.4pt 0in 5.4pt;height:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Evap T out</span><o:p></o:p></p></td><td width=116 nowrap style='width:69.75pt;border:solid windowtext 1.0pt;border-left:none;padding:0in 5.4pt 0in 5.4pt;height:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Conden T in</span><o:p></o:p></p></td><td width=110 nowrap style='width:66.25pt;border:solid windowtext 1.0pt;border-left:none;padding:0in 5.4pt 0in 5.4pt;height:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Coned T out</span><o:p></o:p></p></td></tr><tr style='height:13.2pt'><td width=80 nowrap style='width:48.0pt;border:solid windowtext 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt;height:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>100</span><o:p></o:p></p></td><td width=113 nowrap style='width:68.0pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>85</span><o:p></o:p></p></td><td width=80 nowrap style='width:48.0pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>53.6</span><o:p></o:p></p></td><td width=80 nowrap style='width:48.0pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>0.63</span><o:p></o:p></p></td><td width=108 nowrap style='width:65.0pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>54</span><o:p></o:p></p></td><td width=120 nowrap 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;height:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>44</span><o:p></o:p></p></td><td width=116 nowrap style='width:69.75pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>85</span><o:p></o:p></p></td><td width=110 nowrap style='width:66.25pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>94.8</span><o:p></o:p></p></td></tr><tr style='height:13.2pt'><td width=80 nowrap style='width:48.0pt;border:solid windowtext 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt;height:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>75</span><o:p></o:p></p></td><td width=113 nowrap style='width:68.0pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>63.8</span><o:p></o:p></p></td><td width=80 nowrap style='width:48.0pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>29.8</span><o:p></o:p></p></td><td width=80 nowrap style='width:48.0pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>0.47</span><o:p></o:p></p></td><td width=108 nowrap style='width:65.0pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>51.5</span><o:p></o:p></p></td><td width=120 nowrap 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;height:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>44</span><o:p></o:p></p></td><td width=116 nowrap style='width:69.75pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>75</span><o:p></o:p></p></td><td width=110 nowrap style='width:66.25pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>82</span><o:p></o:p></p></td></tr><tr style='height:13.2pt'><td width=80 nowrap style='width:48.0pt;border:solid windowtext 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt;height:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>50</span><o:p></o:p></p></td><td width=113 nowrap style='width:68.0pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>42.5</span><o:p></o:p></p></td><td width=80 nowrap style='width:48.0pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>13.3</span><o:p></o:p></p></td><td width=80 nowrap style='width:48.0pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>0.31</span><o:p></o:p></p></td><td width=108 nowrap style='width:65.0pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>49</span><o:p></o:p></p></td><td width=120 nowrap 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;height:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>44</span><o:p></o:p></p></td><td width=116 nowrap style='width:69.75pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>65</span><o:p></o:p></p></td><td width=110 nowrap style='width:66.25pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>69.5</span><o:p></o:p></p></td></tr><tr style='height:13.2pt'><td width=80 nowrap style='width:48.0pt;border:solid windowtext 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt;height:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>25</span><o:p></o:p></p></td><td width=113 nowrap style='width:68.0pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>21.3</span><o:p></o:p></p></td><td width=80 nowrap style='width:48.0pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>6.9</span><o:p></o:p></p></td><td width=80 nowrap style='width:48.0pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>0.32</span><o:p></o:p></p></td><td width=108 nowrap style='width:65.0pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>46.5</span><o:p></o:p></p></td><td width=120 nowrap 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;height:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>44</span><o:p></o:p></p></td><td width=116 nowrap style='width:69.75pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>65</span><o:p></o:p></p></td><td width=110 nowrap style='width:66.25pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>67.2</span><o:p></o:p></p></td></tr></table><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>I believe the additional data I need is calculated below, except for the dT term which I am unclear on:<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width=353 style='width:212.0pt;margin-left:-.55pt;border-collapse:collapse'><tr style='height:13.2pt'><td width=80 style='width:48.0pt;border:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt;height:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Load</span><o:p></o:p></p></td><td width=113 style='width:68.0pt;border:solid windowtext 1.0pt;border-left:none;padding:0in 5.4pt 0in 5.4pt;height:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>PLR</span><o:p></o:p></p></td><td width=80 style='width:48.0pt;border:solid windowtext 1.0pt;border-left:none;padding:0in 5.4pt 0in 5.4pt;height:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>kW</span><o:p></o:p></p></td><td width=80 style='width:48.0pt;border:solid windowtext 1.0pt;border-left:none;padding:0in 5.4pt 0in 5.4pt;height:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>f PLR</span><o:p></o:p></p></td></tr><tr style='height:13.2pt'><td width=80 style='width:48.0pt;border:solid windowtext 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt;height:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>85</span><o:p></o:p></p></td><td width=113 style='width:68.0pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>1</span><o:p></o:p></p></td><td width=80 style='width:48.0pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>53.6</span><o:p></o:p></p></td><td width=80 style='width:48.0pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>1</span><o:p></o:p></p></td></tr><tr style='height:13.2pt'><td width=80 style='width:48.0pt;border:solid windowtext 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt;height:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>63.8</span><o:p></o:p></p></td><td width=113 style='width:68.0pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>0.751</span><o:p></o:p></p></td><td width=80 style='width:48.0pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>29.8</span><o:p></o:p></p></td><td width=80 style='width:48.0pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>0.556</span><o:p></o:p></p></td></tr><tr style='height:13.2pt'><td width=80 style='width:48.0pt;border:solid windowtext 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt;height:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>42.5</span><o:p></o:p></p></td><td width=113 style='width:68.0pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>0.500</span><o:p></o:p></p></td><td width=80 style='width:48.0pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>13.3</span><o:p></o:p></p></td><td width=80 style='width:48.0pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>0.248</span><o:p></o:p></p></td></tr><tr style='height:13.2pt'><td width=80 style='width:48.0pt;border:solid windowtext 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt;height:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>21.3</span><o:p></o:p></p></td><td width=113 style='width:68.0pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>0.251</span><o:p></o:p></p></td><td width=80 style='width:48.0pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>6.9</span><o:p></o:p></p></td><td width=80 style='width:48.0pt;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:13.2pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>0.129</span><o:p></o:p></p></td></tr></table><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>Not sure if the dT term required by the curves is the difference in condenser supply and return, or condenser and evaporator supply, condenser supply and evaporator return, etc. Can someone please clarify?<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>Thanks<o:p></o:p></p><p class=MsoNormal><span style='font-family:"Times New Roman","serif"'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-family:"Times New Roman","serif"'> </span><o:p></o:p></p><p class=MsoNormal><b><span style='font-family:"Times New Roman","serif";color:#28AAE1'>Afaan Naqvi </span></b><b><span style='font-family:"Times New Roman","serif";color:gray'> </span></b><span style='font-size:10.0pt;font-family:"Times New Roman","serif";color:gray'>PE LEED AP</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Courier New"'>____________________________________________________________<br>Electronic mail messages entering and leaving Arup business<br>systems are scanned for acceptability of content and viruses</span><o:p></o:p></p></div></div></body></html>