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--></style></head><body lang="EN-CA" link="blue" vlink="purple"><div class="WordSection1"><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">I suggest taking a look at the Taylor Engineering website, they used to have an excel sheet with a considerable amount of VBA code in the back end that generated the DOE coefficients for constant speed, variable speed and chiller systems that utilize variable condenser water flow rate (requires equation to be solved for Cwrt not Cwst).</span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" 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>Jeremy McClanathan<br>
<b>Sent:</b> September-19-13 1:32 PM<br><b>To:</b> 'Hall, Brendan'; 'Sunil Nair'; 'David Eldridge'<br><b>Cc:</b> '<a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a>'<br>
<b>Subject:</b> Re: [Equest-users] Question: Modeling Specific Chillers</span></p></div></div><p class="MsoNormal"> </p><p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">As a word of caution, I tried going down that road before and ended up not being able to use the E+ curves. The parameters from a bi-quadratic equation in metric units cannot be used in eQuest. As Brendan mentioned, you would have to convert to Fahrenheit. I would imagine this would require backing out the parameters necessary to construct a curve from the metric equations, converting to US units, then reconstructing a curve. I don’t know this for a fact though.</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Cheers,</span></p><p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Jeremy</span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#5f5f5f">Jeremy McClanathan</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:gray">,</span><span lang="EN-US" style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray"> P.E., BEMP, HFDP,</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:gray"> </span><span lang="EN-US" style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray">LEED<sup>®</sup> AP</span><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray">19203 36th Avenue W, Suite 200, Lynnwood, WA 98036</span><b><span lang="EN-US" style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:olive"></span></b></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Hall, Brendan [mailto:<a href="mailto:BHall@karpinskieng.com">BHall@karpinskieng.com</a>] <br>
<b>Sent:</b> Thursday, September 19, 2013 10:14 AM<br><b>To:</b> Jeremy McClanathan; 'Sunil Nair'; 'David Eldridge'<br><b>Cc:</b> '<a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a>'<br>
<b>Subject:</b> RE: [Equest-users] Question: Modeling Specific Chillers</span></p></div></div><p class="MsoNormal"><span lang="EN-US"> </span></p><p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">In general, there is also a database of chiller curves that is provided for energyplus that I believe are also valie for eQuest if you convert them into Fahrenheit temperatures. If the one in questions happens to be on that list it could be helpful. </span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span lang="EN-US"><a href="http://simulationresearch.lbl.gov/modelica/releases/latest/help/Buildings_Fluid_Chillers_Data_ElectricEIR.html">http://simulationresearch.lbl.gov/modelica/releases/latest/help/Buildings_Fluid_Chillers_Data_ElectricEIR.html</a></span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p><p class="MsoNormal"><span lang="EN-US">Brendan Hall</span><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" 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> [<a href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>Jeremy McClanathan<br>
<b>Sent:</b> Thursday, September 19, 2013 12:58 PM<br><b>To:</b> 'Sunil Nair'; 'David Eldridge'<br><b>Cc:</b> '<a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a>'<br>
<b>Subject:</b> Re: [Equest-users] Question: Modeling Specific Chillers</span></p></div></div><p class="MsoNormal"><span lang="EN-US"> </span></p><p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Hello Sunil,</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">It sounds like the manufacturer may be trying to get you a capacity for a given set of condenser and evaporator temperatures. What you need is the manufacturer to tell you what the full load (and part load) capacities of the machine are with the lift conditions you specified. So, for higher lift conditions, the machine will have lower capacities. He doesn’t need to match the capacity you selected the chiller at to all the lift conditions you specify.</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">If it helps, the spreadsheet I use to generate custom chiller curves can be downloaded from here:</span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><a href="http://www.esimforums.com/equest/viewtopic.php?f=13&t=116&start=0&view=viewpoll">http://www.esimforums.com/equest/viewtopic.php?f=13&t=116&start=0&view=viewpoll</a></span></b></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Cheers,</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Jeremy</span></p><p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Myriad Web Pro";color:gray">___________________________________________</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#5f5f5f">Jeremy McClanathan</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:gray">,</span><span lang="EN-US" style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray"> P.E., BEMP, HFDP,</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:gray"> </span><span lang="EN-US" style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray">LEED<sup>®</sup> AP</span><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray">19203 36th Avenue W, Suite 200, Lynnwood, WA 98036</span><b><span lang="EN-US" style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:olive"></span></b></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray">P 425-672-1071 | F 425-778-8769 </span><span lang="EN-US" style="font-size:11.0pt;font-family:"Verdana","sans-serif";color:#1f497d"></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Sunil Nair [<a href="mailto:energymodel.sunil@gmail.com">mailto:energymodel.sunil@gmail.com</a>] <br>
<b>Sent:</b> Wednesday, September 18, 2013 9:55 PM<br><b>To:</b> David Eldridge<br><b>Cc:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> Re: [Equest-users] Question: Modeling Specific Chillers</span></p>
</div><p class="MsoNormal"><span lang="EN-US"> </span></p><div><div><p class="MsoNormal"><span lang="EN-US">I think I am hitting a roadblock here, trying to get the necessary data to model the chillers. I have gone through the EDR document on simulating HVAC systems and other posts on modeling chillers here on the mailing list. I think I can get the part load data from the manufacturer.</span></p>
</div><div><p class="MsoNormal"><span lang="EN-US"> </span></p></div><div><p class="MsoNormal"><span lang="EN-US">Trying to get the full load data has been difficult though. The chiller manufacturer tells me that if I want the full load capacity at reduced condenser entering and/or higher evaporator leaving temperatures, he can only provide up to about 5% higher capacity than design capacity. Beyond this he will need to change the expansion device in his selection software to get the total capacity. I don't believe changing the expansion device is the right way to go.</span></p>
</div><div><p class="MsoNormal"><span lang="EN-US"> </span></p></div><div><p class="MsoNormal"><span lang="EN-US">I have attached a sample data sheet with various data points that I thought I should get from the manufacturers. The data points I have in the sheet are what will be practically seen in operation here. However they are all lower than the design temperatures of the chiller. I'm not sure if I am going in the right direction with this one.</span></p>
</div><div><p class="MsoNormal"><span lang="EN-US"> </span></p></div><div><p class="MsoNormal"><span lang="EN-US">Any inputs are appreciated.</span></p></div><div><p class="MsoNormal"><span lang="EN-US"> </span></p></div>
<div><p class="MsoNormal"><span lang="EN-US">Thanks,</span></p></div><div><p class="MsoNormal"><span lang="EN-US"> </span></p></div><div><p class="MsoNormal"><span lang="EN-US">Sunil Nair</span></p></div><div><p><b><span lang="EN-US" style="color:#1f497d">Ab Initio</span></b><span lang="EN-US"></span></p>
<p><span lang="EN-US" style="color:#1f497d">TMA House, Plot No. 6, 2nd Floor,</span><span lang="EN-US"></span></p><p><span lang="EN-US" style="color:#1f497d">Main Road, Wagle Industrial Area,</span><span lang="EN-US"></span></p>
<p><span lang="EN-US" style="color:#1f497d">Thane (West) - 400 604</span><span lang="EN-US"></span></p><p><span lang="EN-US" style="color:#1f497d">Ph: +91-22 - 3243 7023</span><span lang="EN-US"></span></p><p><span lang="EN-US" style="color:#1f497d">Cell: +91-8879595123</span><span lang="EN-US"></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">web: <a href="http://www.abinitio.co.in/" target="_blank"><span style="color:#0066cc">www.abinitio.co.in</span></a></span><span lang="EN-US"></span></p>
</div></div><div><p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-US"> </span></p><div><p class="MsoNormal"><span lang="EN-US">On Fri, Aug 16, 2013 at 7:25 PM, David Eldridge <<a href="mailto:DEldridge@grummanbutkus.com" target="_blank">DEldridge@grummanbutkus.com</a>> wrote:</span></p>
<div><div><p class="MsoNormal" style><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">You should be able to look at the manufacturer data plotted vs ECWT and load and determine if a single set of curves (one modeled chiller) or two are needed to accurately model power usage by the chiller over the range of load. (if you can get the data)</span><span lang="EN-US"></span></p>
<p class="MsoNormal" style><u><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span></u><span lang="EN-US"></span></p>
<p class="MsoNormal" style><span lang="EN-US" style="font-size:8.0pt;font-family:"Calibri","sans-serif""> </span><span lang="EN-US"></span></p><p class="MsoNormal" style><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">David S. Eldridge, Jr., P.E., LEED AP BD+C, BEMP, BEAP, HBDP</span><span lang="EN-US"></span></p>
<p class="MsoNormal" style><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#244061">Grumman/Butkus Associates</span></b><span lang="EN-US"></span></p><p class="MsoNormal" style>
<u><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span></u><span lang="EN-US"></span></p>
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<p class="MsoNormal" style><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Sunil Nair [mailto:<a href="mailto:energymodel.sunil@gmail.com" target="_blank">energymodel.sunil@gmail.com</a>] <br>
<b>Sent:</b> Thursday, August 15, 2013 11:40 PM<br><b>To:</b> Busman, Michael R<br><b>Cc:</b> David Eldridge; <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a></span><span lang="EN-US"></span></p>
<div><div><p class="MsoNormal"><span lang="EN-US"><br><b>Subject:</b> Re: [Equest-users] Question: Modeling Specific Chillers</span></p></div></div><div><div><p class="MsoNormal" style><span lang="EN-US"> </span></p><div>
<div><div><div><p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-US">Dave and Mike,</span></p></div><p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-US">Thanks for your inputs.</span></p></div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-US">Mike,</span></p></div><div><p class="MsoNormal" style><span lang="EN-US">Yes, I am referring to the multistage chiller where the liquid is flashed to the inlet of the second stage impeller. As you have mentioned this process is internal to the chiller.</span></p>
</div><div><p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-US">My thought initially was I may have to model multiple compressors per circuit for a chiller without VFD. I did not find this option in eQUEST. As I think about it now, my case would be quite different from having multiple compressors per circuit.</span></p>
</div><div><p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-US">I am in the process of obtaining data points for the chiller from the manufacturer so I can input the data points into eQUEST.</span></p></div>
<div><p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-US">I'll keep this thread updated.</span></p></div><div><p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-US">Sincerely,</span></p></div>
<div><div><p class="MsoNormal" style><span lang="EN-US">Sunil Nair</span></p><p class="MsoNormal" style><b><span lang="EN-US" style="color:#1f497d">Ab Initio</span></b><span lang="EN-US"></span></p><p class="MsoNormal" style>
<span lang="EN-US" style="color:#1f497d">TMA House, Plot No. 6, 2nd Floor,</span><span lang="EN-US"></span></p><p class="MsoNormal" style><span lang="EN-US" style="color:#1f497d">Main Road, Wagle Industrial Area,</span><span lang="EN-US"></span></p>
<p class="MsoNormal" style><span lang="EN-US" style="color:#1f497d">Thane (West) - 400 604</span><span lang="EN-US"></span></p><p class="MsoNormal" style><span lang="EN-US" style="color:#1f497d">Ph: +91-22 - 3243 7023</span><span lang="EN-US"></span></p>
<p class="MsoNormal" style><span lang="EN-US" style="color:#1f497d">Cell: +91-8879595123</span><span lang="EN-US"></span></p><p class="MsoNormal" style><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">web: <a href="http://www.abinitio.co.in" target="_blank">www.abinitio.co.in</a></span><span lang="EN-US"></span></p>
</div></div></div><div><p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-US"> </span></p><div><p class="MsoNormal" style><span lang="EN-US">On Wed, Aug 14, 2013 at 10:56 PM, Busman, Michael R <<a href="mailto:MBusman@chevron.com" target="_blank">MBusman@chevron.com</a>> wrote:</span></p>
<div><div><p class="MsoNormal" style><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Sunil,</span><span lang="EN-US"></span></p><p class="MsoNormal" style><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><span lang="EN-US"></span></p>
<p class="MsoNormal" style><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">My understanding of an economizer for a multi-stage centrifugal is that some of the liquid refrigerant flashes as it passes through the expansion device. This flash gas, I believe is introduced to the input side of the second stage impeller. Since the economizer is internal to the chiller, one set of curves should be sufficient as there is only one mode of operation as I understand it. You didn’t specify, so I’m assuming you are not referring to a water-side economizer.</span><span lang="EN-US"></span></p>
<p class="MsoNormal" style><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><span lang="EN-US"></span></p><p class="MsoNormal" style><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">I haven’t custom defined a chiller yet in eQUEST, however, it appears that several performance data points from the manufacturer are required for eQUEST to generate the curves if you select this method. The other is to generate your own curves. Many years ago when I used to work in VisualDOE, I found the calculation methodology to define chiller curves from the Pacific Gas & Electric web site, which I used to set up a spreadsheet to calculate the curve coefficients. This was originally set up for constant speed chillers. A number of months ago I added a spreadsheet tab to handle variable speed chillers. To create the 3 sets of curve coefficients, at least 10 full load data points at different chilled and condenser water temperatures were required from the manufacturer in order to map the compressor. There was no max or min limit for the part-load data points as I recall.</span><span lang="EN-US"></span></p>
<p class="MsoNormal" style><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><span lang="EN-US"></span></p><p class="MsoNormal" style><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">If you’d like a copy of the spreadsheet, I can email it to you, however, you might want to check the eQUEST manual or DOE-2.2 reference manuals regarding directly entering data points into eQUEST and let the program figure out the curves for you.</span><span lang="EN-US"></span></p>
<p class="MsoNormal" style><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><span lang="EN-US"></span></p><p class="MsoNormal" style><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">My best,</span><span lang="EN-US"></span></p>
<p class="MsoNormal" style><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><span lang="EN-US"></span></p><p class="MsoNormal" style><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Mike Busman</span><span lang="EN-US"></span></p>
<p class="MsoNormal" style><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><span lang="EN-US"></span></p><p class="MsoNormal" style><b><span lang="EN-US" style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:#1f497d">Michael R. Busman, CEM</span></b><span lang="EN-US"></span></p>
<p class="MsoNormal" style><span lang="EN-US" style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:#1f497d">Lead Project Engineer II</span><span lang="EN-US"></span></p><p class="MsoNormal" style>
<span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><span lang="EN-US"></span></p><p class="MsoNormal" style><b><span lang="EN-US" style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:#1f497d">Chevron Energy Solutions</span></b><span lang="EN-US"></span></p>
<p class="MsoNormal" style><span lang="EN-US" style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:#1f497d">A Division of Chevron U.S.A., Inc.</span><span lang="EN-US"></span></p><p class="MsoNormal" style>
<span lang="EN-US" style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:#1f497d">145 S. State College Blvd.</span><span lang="EN-US"></span></p><p class="MsoNormal" style><span lang="EN-US" style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:#1f497d">Brea, CA 92821 </span><span lang="EN-US"></span></p>
<p class="MsoNormal" style><span lang="EN-US" style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:#1f497d">Direct 714-671-3561</span><span lang="EN-US"></span></p><p class="MsoNormal" style>
<span lang="EN-US" style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:#1f497d">Fax 714-671-3438</span><span lang="EN-US"></span></p><p class="MsoNormal" style><span lang="EN-US" style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:#1f497d">eFax 866-420-0335 (Include my Full Name followed by "CAI:MHTZ" on Cover Sheet)</span><span lang="EN-US"></span></p>
<p class="MsoNormal" style><span lang="EN-US" style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:#1f497d">Mobile 310-387-2083</span><span lang="EN-US"></span></p><p class="MsoNormal" style>
<span lang="EN-US" style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:#1f497d"><a href="mailto:mbusman@chevron.com" target="_blank">mbusman@chevron.com</a></span><span lang="EN-US"></span></p>
<p class="MsoNormal" style><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><span lang="EN-US"></span></p><p class="MsoNormal" style><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><span lang="EN-US"></span></p>
<p class="MsoNormal" style><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><span lang="EN-US"></span></p><div><div style="border:none;border-top:solid windowtext 1.0pt;padding:3.0pt 0cm 0cm 0cm;border-color:currentColor currentColor">
<p class="MsoNormal" style><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> <a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a> [mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>David Eldridge<br>
<b>Sent:</b> Wednesday, August 14, 2013 9:46 AM<br><b>To:</b> Sunil Nair<br><b>Cc:</b> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> Re: [Equest-users] Question: Modeling Specific Chillers</span><span lang="EN-US"></span></p>
</div></div><div><div><p class="MsoNormal" style><span lang="EN-US"> </span></p><div><p class="MsoNormal" style><span lang="EN-US">When the chiller runs on economizer it will use a separate set of curves and be modeled as a distinct chiller.</span></p>
</div><div><p class="MsoNormal" style><span lang="EN-US"> </span></p></div><div><p class="MsoNormal" style><span lang="EN-US">One set of curves will be difficult to model both modes of operation.<br><br>DSE Mobile</span></p>
</div><div><p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-US"><br>On Aug 14, 2013, at 11:34 AM, "Sunil Nair" <<a href="mailto:energymodel.sunil@gmail.com" target="_blank">energymodel.sunil@gmail.com</a>> wrote:</span></p>
</div><blockquote style="margin-top:5.0pt;margin-bottom:5.0pt"><div><div><div><p class="MsoNormal" style><span lang="EN-US">Hi All,</span></p></div><div><p class="MsoNormal" style><span lang="EN-US"> </span></p></div><div>
<p class="MsoNormal" style><span lang="EN-US">I have a couple of questions with respect to modeling specific chillers.</span></p></div><div><p class="MsoNormal" style><span lang="EN-US"> </span></p></div><div><p class="MsoNormal" style>
<span lang="EN-US">1) I am trying to model a centrifugal chiller with an economizer. The chiller in question is a centrifugal chiller running on R123 with an economizer installed to it. Do I just need to get data from the chiller manufacturer and input the curves into the model? Is this the right way to go?</span></p>
</div><div><p class="MsoNormal" style><span lang="EN-US"> </span></p></div><div><p class="MsoNormal" style><span lang="EN-US">2) How do you model multi stage centrifugal chillers without VFD's?</span></p></div><div><p class="MsoNormal" style>
<span lang="EN-US"> </span></p></div><div><p class="MsoNormal" style><span lang="EN-US">Thanks,</span></p></div><div><p class="MsoNormal" style><span lang="EN-US"> </span></p></div><div><p class="MsoNormal" style><span lang="EN-US">Sunil Nair</span></p>
</div><div><p style="margin:0cm;margin-bottom:.0001pt"><b><span lang="EN-US" style="font-family:"Calibri","sans-serif"">Ab Initio</span></b><span lang="EN-US"></span></p><p style="margin:0cm;margin-bottom:.0001pt">
<span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif"">TMA House, Plot No. 6, 2nd Floor,</span><span lang="EN-US"></span></p><p style="margin:0cm;margin-bottom:.0001pt"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Main Road, Wagle Industrial Area,</span><span lang="EN-US"></span></p>
<p style="margin:0cm;margin-bottom:.0001pt"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Thane (West) - 400 604</span><span lang="EN-US"></span></p><p style="margin:0cm;margin-bottom:.0001pt">
<span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><a href="http://www.abinitio.co.in/" target="_blank"><span style="color:black">www.abinitio.co.in</span></a></span><span lang="EN-US"></span></p>
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