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<p class="MsoNormal"><span style="color:#1F497D">What’s the ratio of the kW/cfm for the two cases, and the ratio of total cfm?
<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.e. as you are proposing, if the two systems run at the same sequence of operation to get a 6x factor of reduction you’d have to be some combination of 2x the cfm in the baseline and 3x the power use per CFM
– if that’s not accurate then the likely culprit is the sequence which may be allowing the proposed case to run fewer hours or running much longer at part-load if the proposed case has that capability – maybe add a report to see the load profile for the two
cases.<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">Another check is that unmet hours and temperature plots in the SS-O report were consistent between the two cases providing equal comfort. Reviewing the SS-O can help you find an instance where the temperature
control sequence isn’t equivalent resulting in more runtime for the baseline case.
<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">A third check – were the two cases showing reasonable increase in efficiency for the proposed case of the other end-uses for cooling, heating, lighting, etc – verify there isn’t a stray heat gain causing increased
run-time in one case.<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">David<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="color:#1F497D">David S. Eldridge, Jr.</span></b><b><span style="color:#244061">, P</span></b><b><span style="color:#1F497D">.</span></b><b><span style="color:#244061">E</span></b><b><span style="color:#1F497D">.</span></b><b><span style="color:#244061">,
LEED AP BD+C, BEMP, BEAP, HBDP</span></b><span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Associate</span><span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:4.0pt;color:#1F497D"> </span><span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#365F91">Direct: (847) 316-92</span><span style="color:#1F497D">24</span><span style="color:#365F91"> | Mobile: (</span><span style="color:#1F497D">773</span><span style="color:#365F91">)
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<p class="MsoNormal"><span style="font-size:10.0pt;color:#1F497D"> </span><span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="color:#244061">Grumman/Butkus Associates</span></b><span style="color:gray">
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<p class="MsoNormal"><b>From:</b> Equest-users [mailto:equest-users-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Jeff Ross-Bain via Equest-users<br>
<b>Sent:</b> Sunday, July 21, 2019 2:05 PM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Baseline Fan Energy Very High<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi All,<o:p></o:p></p>
<p class="MsoNormal">To those of you who regularly and graciously contribute your knowledge to this site, we all owe you a huge debt of gratitude. Thank you.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am stumped. Usually, in my experience, following the standard Baseline process of establishing [ASHRAE max] fan power and applying that value to eQuest in kW/cfm, the resulting difference between Baseline and Proposed is evident but not
super big.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">In this case, on a small project with 6 x under 5-ton split HP systems, the Baseline fan energy use is, like, over 6 times bigger than the Proposed. I have exhausted every check and iteration I can think of and cannot find out why or how
this occurs. As-is, the energy savings is incredible on fan power alone and I know it is not right.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Any thoughts or similar experiences with this circumstance? <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"><o:p> </o:p></p>
<p class="MsoNormal"><b><span style="font-size:8.0pt;font-family:"Century Gothic",sans-serif;color:#006E78">Jeff Ross-Bain, BCxP, BEMP, LEED Fellow, MSc<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Century Gothic",sans-serif;color:#535053">President<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Century Gothic",sans-serif;color:#535053"><o:p> </o:p></span></p>
<p class="MsoNormal"><a href="http://www.rbgb.com/"><span style="color:windowtext;text-decoration:none"><img border="0" width="131" height="57" id="Picture_x0020_1" src="cid:image001.jpg@01D54083.82577200" alt="RBGB_Logo_Hi-Res"></span></a><span style="font-size:7.5pt;font-family:"Century Gothic",sans-serif;color:#535053"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:7.5pt;font-family:"Century Gothic",sans-serif;color:#535053"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:7.5pt;font-family:"Century Gothic",sans-serif;color:#535053">Charleston: 843-779-9229<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:7.5pt;font-family:"Century Gothic",sans-serif;color:#535053">Atlanta: 404-220-8955
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<p class="MsoNormal"><b><span style="font-size:7.5pt;font-family:"Century Gothic",sans-serif;color:#006E78"><o:p> </o:p></span></b></p>
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