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<div class="moz-cite-prefix">Hi Omar,<br>
<br>
For estimating proposed buildings cooling/heating efficiencies
you can follow any of two method's mentioned below-<br>
1. You can use default heating cooling efficiencies as per USGBC
DES modelling document.<br>
2. You have to calculate manually heating and cooling efficiencies
of whole plant( Including Cooling tower , pumps, chillers etc.) at
part load i.e DES system capacity.<br>
<br>
I would suggest that modelling of whole system is not required
when DES option is availed.<br>
<pre class="moz-signature" cols="72">Thanks & Regards
Rajendra Choudhary
Sr.Energy Analyst
e: <a class="moz-txt-link-abbreviated" href="mailto:rajendra@kalpakrit.com">rajendra@kalpakrit.com</a>
</pre>
On 1/6/2014 10:12 PM, Scott Parker wrote:<br>
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<div class="WordSection1">
<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>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b>
<a class="moz-txt-link-abbreviated" href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>
[<a class="moz-txt-link-freetext" href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>Omar Katanani<br>
<b>Sent:</b> Monday, January 06, 2014 11:30 AM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] Modeling District Energy
Systems for LEED<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"
lang="EN-GB">Dear Sirs,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"
lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"
lang="EN-GB">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
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"
lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"
lang="EN-GB">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
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"
lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo2"><!--[if !supportLists]--><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"
lang="EN-GB"><span style="mso-list:Ignore">1)<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"
lang="EN-GB">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
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"
lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoListParagraph"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"
lang="EN-GB">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
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"
lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-indent:.5in"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"
lang="EN-GB">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
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"
lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo2"><!--[if !supportLists]--><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"
lang="EN-GB"><span style="mso-list:Ignore">2)<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"
lang="EN-GB">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
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"
lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#000082;mso-fareast-language:EN-GB"
lang="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
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#000082;mso-fareast-language:EN-GB"
lang="EN-GB">Omar<o:p></o:p></span></p>
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<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy;mso-fareast-language:EN-GB"
lang="EN-GB">Omar Katanani</span><span
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Roman","serif";color:#000082;mso-fareast-language:EN-GB"><br>
</span><span
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