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--></style></head><body lang="EN-US" link="#0563C1" vlink="#954F72"><div class="WordSection1"><p class="MsoNormal">To add to what David wrote below, in my experience one of the most common reason for excessively high fan energy savings is a substantial reduction in fan runtime due to change from continuously running fans in the baseline to cycling fans in the proposed design. You wrote below that this is a small commercial project, so the baseline is probably System 3 – PSZ and has constant volume (CV) fans. You can calculate the Effective Full Load Hours (EFLH) of the baseline fan as a ratio of the annual fan energy (kWh) to fan peak load (kW) from SS-P report. For baseline System 3, EFLH should be slightly higher than the number of hours per year that your building is occupied since, following 90.1 App G, fans must run continuously when building is occupied and cycle with load during unoccupied hours. </p><p class="MsoNormal"> </p><p class="MsoNormal">If proposed systems are also CV, they should have very similar EFLH unless there is a DOAS in the proposed design. If there is no DOAS but you get significantly different EFLH between baseline and proposed, double-check that you haven’t accidentally changed the proposed Indoor Fan Mode from continuous to intermittent. You can also figure it out by looking at SS-L report – for continuously running CV systems, only the “100+” bin would have hours listed in it. If you see hours in other bins, it means that your CV system is modeled as cycling with load.</p><p class="MsoNormal"> </p><p class="MsoNormal">Maria</p><p class="MsoNormal"> </p><div><div style="border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal"><b>From:</b> Equest-users <<a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>> <b>On Behalf Of </b>David Eldridge via Equest-users<br><b>Sent:</b> Monday, July 22, 2019 12:49 PM<br><b>To:</b> <a href="mailto:equest-users@onebuilding.org">equest-users@onebuilding.org</a><br><b>Subject:</b> Re: [Equest-users] Baseline Fan Energy Very High</p></div></div><p class="MsoNormal"> </p><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? </span></p><p class="MsoNormal"><span style="color:#1f497d"> </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.</span></p><p class="MsoNormal"><span style="color:#1f497d"> </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. </span></p><p class="MsoNormal"><span style="color:#1f497d"> </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.</span></p><p class="MsoNormal"><span style="color:#1f497d"> </span></p><p class="MsoNormal"><span style="color:#1f497d">David</span></p><div><p class="MsoNormal"><span style="color:#1f497d"> </span></p><p class="MsoNormal"><span style="color:#1f497d"> </span></p><p class="MsoNormal"><b><span style="color:#1f497d">David S. Eldridge, Jr.</span><span style="color:#244061">, P</span><span style="color:#1f497d">.</span><span style="color:#244061">E</span><span style="color:#1f497d">.</span><span style="color:#244061">, LEED AP BD+C, BEMP, BEAP, HBDP</span></b><span style="color:#1f497d"></span></p><p class="MsoNormal"><span style="color:#1f497d">Associate</span></p><p class="MsoNormal"><span style="font-size:4.0pt;color:#1f497d"> </span><span style="color:#1f497d"></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">) </span><span style="color:#1f497d">490</span><span style="color:#365f91">-</span><span style="color:#1f497d">5038</span></p><p class="MsoNormal"><span style="font-size:10.0pt;color:#1f497d"> </span><span style="color:#1f497d"></span></p><p class="MsoNormal"><b><span style="color:#244061">Grumman/Butkus Associates</span></b><span style="color:gray"> </span><span style="color:#365f91">| 820 Davis Street, Suite 300 | Evanston, IL 60201</span><span style="color:#1f497d"></span></p><p class="MsoNormal"><span style="font-size:9.0pt;color:gray">Energy Efficiency Consultants and Sustainable Design Engineers</span><span style="color:#1f497d"></span></p><p class="MsoNormal"><span style="color:#1f497d"> </span></p><p class="MsoNormal"><u><span style="font-size:9.0pt;color:gray"><a href="http://grummanbutkus.com/"><span style="color:gray">grummanbutkus.com</span></a></span></u><span style="font-size:9.0pt;color:gray"> | <u><a href="http://grummanbutkus.com/blog"><span style="color:gray">Blog</span></a></u> | <u><a href="https://www.facebook.com/pages/GrummanButkus-Associates/1385285015032526"><span style="color:gray">Facebook</span></a></u> | <u><a href="https://twitter.com/grummanbutkus"><span style="color:gray">Twitter</span></a></u></span><span style="color:gray"></span></p></div><p class="MsoNormal"><span style="color:#1f497d"> </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> Equest-users [<a href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>] <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> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> [Equest-users] Baseline Fan Energy Very High</p></div></div><p class="MsoNormal"> </p><p class="MsoNormal">Hi All,</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.</p><p class="MsoNormal"> </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.</p><p class="MsoNormal"> </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. </p><p class="MsoNormal"> </p><p class="MsoNormal">Any thoughts or similar experiences with this circumstance? </p><p class="MsoNormal"> </p><p class="MsoNormal">Thanks!</p><p class="MsoNormal"> </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</span></b></p><p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Century Gothic",sans-serif;color:#535053">President</span></p><p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Century Gothic",sans-serif;color:#535053"> </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" style="width:1.3666in;height:.5916in" id="Picture_x0020_1" src="cid:image001.jpg@01D5409F.FB1542F0" alt="RBGB_Logo_Hi-Res"></span></a><span style="font-size:7.5pt;font-family:"Century Gothic",sans-serif;color:#535053"></span></p><p class="MsoNormal"><b><span style="font-size:7.5pt;font-family:"Century Gothic",sans-serif;color:#535053"> </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</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 </span></b><span style="font-size:7.5pt;font-family:"Century Gothic",sans-serif;color:#535053"><br></span><b><span style="font-size:7.5pt;font-family:"Century Gothic",sans-serif;color:#006e78"><a href="http://www.rbgb.com/"><span style="color:blue">www.rbgb.com</span></a></span></b><span style="font-size:7.5pt;font-family:"Century Gothic",sans-serif;color:#535053"><br><br></span><span style="font-size:7.5pt;font-family:"Century Gothic",sans-serif;color:#006e78">Maximizing Building Performance </span></p><p class="MsoNormal"><b><span style="font-size:7.5pt;font-family:"Century Gothic",sans-serif;color:#006e78"> </span></b></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic",sans-serif;color:#006e78">Join us at <b><a href="https://www.greenbuildexpo.com/en/register.html"><span style="color:blue">GREENBUILD 2019</span></a></b> where two <b>RBGB</b> projects will be showcased.</span></p><p class="MsoNormal"><span style="font-size:8.0pt"> </span></p><p class="MsoNormal"><a href="https://www.greenbuildexpo.com/en/register.html"><span style="color:windowtext;text-decoration:none"><img border="0" width="294" height="52" style="width:3.0666in;height:.5416in" id="Picture_x0020_2" src="cid:image002.jpg@01D5409F.FB1542F0" alt="cid:image001.jpg@01D53CAF.A3CD6CF0"></span></a><span style="font-size:7.5pt;font-family:"Century Gothic",sans-serif;color:#006e78"></span></p><p class="MsoNormal"> </p></div></body></html>