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<p class="MsoNormal"><span style="color:#1F497D">Omar,<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">For the "modeling" option you will need to model the plant with the assumed full load (which includes more than just the one building). In a separate energy mode: Run an energy model with load from all buildings
on it, and then use the average efficiency (e.g. kW/ton, COP, etc) in the building model as a constant efficiency for the whole year.
<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">For example, from the plant model you may come up with a COP = 5.1 as an
<u>annual average</u>. Then the building model would use COP = 5.1 as a <u>constant value</u>.<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'll leave it up to you to determine the best way to model the full load on the DES plant, but this could be estimated with a relatively simple model. The modeling software Trace has a specific feature for this,
but you can manually do this in eQuest with a little work.<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">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Scott<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b>From:</b> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Omar Katanani<br>
<b>Sent:</b> Monday, January 06, 2014 11:30 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Modeling District Energy Systems for LEED<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy">Dear Sirs,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy">I am modeling a school building for LEED which has a Campus Energy System (water cooled chiller and diesel boiler). The DES was installed almost 8 months
ago for the first phase of the project.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy">Now, I am modeling for the project’s second phase, and additional chillers / boilers will be added to the DES in order to be able to serve both phases
in addition to any potential building on campus in the future.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"><span style="mso-list:Ignore">1)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy">Looking at the USGBC’s guidance for DES (Appendix C): in order to determine the proposed building heating / cooling efficiency, I guess I
have to go with the “Modeling” option because the DES will be expanded as part of my project (so it’s not existing).
<o:p></o:p></span></p>
<p class="MsoListParagraph"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"><o:p> </o:p></span></p>
<p class="MsoListParagraph"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy">For this option, do I have to create a separate model of the district plant, or shall I add this district plant to my project's model? Appendix
C says "Apply measured or estimated load profiles as "process loads" to reflect the estimated total loads on the plant". If this is the case, then if I add the process loads in addition to my project's loads, I will be double counting the loads, right?<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:.5in"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-indent:.5in"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy">Does this mean I have to create a dummy project building (with no loads) with the proposed district plant to determine the
efficiencies?<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:.5in"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"><span style="mso-list:Ignore">2)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy">Does anyone have additional guidance for modeling district energy systems, other than the one of the USGBC? Something with more examples or
maybe a case study with actual numbers?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#000082;mso-fareast-language:EN-GB">Best regards,</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#000082;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#000082;mso-fareast-language:EN-GB">Omar<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-bottom-alt:auto"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy;mso-fareast-language:EN-GB">___________________________</span><span style="font-size:12.0pt;font-family:"Arial","sans-serif";color:#000082;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy;mso-fareast-language:EN-GB">Omar Katanani</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif";color:#000082;mso-fareast-language:EN-GB"><br>
</span><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy;mso-fareast-language:EN-GB">Senior Sustainability Engineer</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif";color:#000082;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy;mso-fareast-language:EN-GB">Email:
<a href="mailto:omar@ecoconsulting.net">omar@ecoconsulting.net</a></span><span style="font-size:12.0pt;font-family:"Times New Roman","serif";color:#000082;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
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Nahas Building, 4<sup>th</sup> floor</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif";color:#000082;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-GB" style="font-size:7.5pt;font-family:"Arial","sans-serif";color:navy;mso-fareast-language:EN-GB">Tel: +961 (0) 1 971 266
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Tel: +44 (0) 20 8144 0015<br>
Website: </span><span lang="EN-GB" style="font-family:"Century Gothic","sans-serif";color:navy;mso-fareast-language:EN-GB"><a href="http://www.ecoconsulting.net/"><span style="font-size:7.5pt;font-family:"Arial","sans-serif";color:navy">www.ecoconsulting.net</span></a></span><span lang="EN-GB" style="color:#000099;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
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