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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>John, wouldn’t there also be reduced chiller energy due to
the pump introducing less heat into loop?<o:p></o:p></span></p>
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color:#A0002F'> </span><span style='font-size:18.0pt;font-family:Cheltenham;
color:#A0002F'>Dan Russell, EIT <o:p></o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:
"Tahoma","sans-serif";color:windowtext'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Xavier
García Casals<br>
<b>Sent:</b> Friday, October 31, 2008 4:47 AM<br>
<b>To:</b> Aulbach, John<br>
<b>Cc:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] CHW Pump differential temperature<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Hi,<br>
Probably because the chiller's EIR is reduced due to a more favorable inlet
temperature. Have a look at your chiller performance curves in the model.<br>
<br>
En/na Aulbach, John ha escrit: <o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>All:</span><o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>I have run a Base Case and a Parametric run for a Central Plant
serving an office complex. Everything in both runs is the same, EXCEPT that the
Base run has a 10°F differential temperature and the Parametric run has a 15°F
differential temperature. The CHW pump is variable speed.</span><o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>As expected, electric energy is saved (about 40,000 kWh/year for a
600 ton plant). However, about 15,000 kWh is saved at the Chilled Water
pump, and 22,000 kWh is saved at the chiller.</span><o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>I changed the Loop Design DT to 15°F and the CHW Coil Design Delta
T to 15°F.</span><o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>Why is my chiller energy reducing?</span><o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>Thanks.</span><o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal><span style='color:blue'>John R. Aulbach, PE, CEM</span><o:p></o:p></p>
<p class=MsoNormal><em><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Project
Manager</span></em><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>Nexant, Inc</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>.</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>701
West Kimberly Ave., Suite 245</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Placentia,
CA 92870-6342 USA</span><o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>email:
<a href="mailto:jaulbach@nexant.com" title="mailto:jaulbach@nexant.com">jaulbach@nexant.com</a></span><o:p></o:p></p>
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<pre><o:p> </o:p></pre><pre style='text-align:center'>
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<p class=MsoNormal>-- <br>
<br>
<o:p></o:p></p>
<pre><b><span lang=CA style='font-size:12.0pt;font-family:"Arial","sans-serif"'> </span></b><o:p></o:p></pre><pre><b><span
lang=CA style='font-size:12.0pt;font-family:"Arial","sans-serif"'>Xavier García Casals</span></b><o:p></o:p></pre><pre><span
lang=CA style='font-family:"Arial","sans-serif"'> </span><o:p></o:p></pre><pre><b><span
lang=CA style='font-family:"Arial","sans-serif"'>Sistemas Solares, Eficiencia Energética e Ingeniería Bioclimática </span></b><o:p></o:p></pre><pre><b><span
lang=CA style='font-family:"Arial","sans-serif"'>AIGUASOL INGENIERÍA</span></b><o:p></o:p></pre><pre><b><span
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lang=CA style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#009900'>Sistemes Avançats d’Energia Solar Tèrmica SCCL</span><o:p></o:p></pre><pre><span
lang=CA style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#009900'>C/ Palermo, 17. Bajos dcha. 28043 Madrid</span><o:p></o:p></pre><pre><span
lang=CA style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#009900'>Tel: (+34) 91 142 27 88</span><o:p></o:p></pre><pre><span
lang=CA style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#009900'> </span><o:p></o:p></pre><pre><span
lang=CA style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#009900'>C/ Roger de Llúria, 29 3r 2a 08009 Barcelona</span><o:p></o:p></pre><pre><span
lang=CA style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#009900'>Tel: (+34) 93 342 47 55 Fax: (+34) 93 342 47 56</span><o:p></o:p></pre><pre><span
lang=CA style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#009900'> </span><o:p></o:p></pre><pre><span
lang=CA style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#009900'>Mobil: 660 22 94 45</span><o:p></o:p></pre><pre><span
lang=CA style='font-size:8.0pt;font-family:"Arial","sans-serif";color:blue'><a
href="mailto:xavier.garcia@aiguasol.coop">xavier.garcia@aiguasol.coop</a></span><o:p></o:p></pre><pre><span
lang=CA style='font-size:8.0pt;font-family:"Arial","sans-serif";color:blue'><a
href="http://www.aiguasol.coop/">http://www.aiguasol.coop</a></span><o:p></o:p></pre><pre><b><span
lang=CA style='font-size:12.0pt;font-family:"Arial","sans-serif"'> </span></b><o:p></o:p></pre>
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