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<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy">All,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy">I just wanted to follow up on this. I was able to recover the unmet hours by declaring a minimum flow density (cfm/f^2) . I also implemented
John’s suggestion of widening the deadband, although I suppose I should have performed each of these changes individually in order to see which one contributes most to an acceptable simulation.
<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy">After doing this I began making the system definitions match the equipment specs on the drawings (supply flow rate, outside air flow
rate) but now the proposed model reports extremely high energy usage (millions of MBtu). I’m pretty sure that the baseline design is not more efficient than the proposed. It seems like the systems run at no less than 50% all the time (per the summary tab).
My hunch is that this is a problem related to schedules, but I’m really stumped and wanted to see if any of you gurus have suggestions.
<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy">Regards,
<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy">Matt<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
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<p class="MsoNormal"><b><font size="2" face="Tahoma"><span style="font-size:10.0pt;
font-family:Tahoma;font-weight:bold">From:</span></font></b><font size="2" face="Tahoma"><span style="font-size:10.0pt;font-family:Tahoma"> John Aulbach [mailto:jra_sac@yahoo.com]
<br>
<b><span style="font-weight:bold">Sent:</span></b> Friday, March 16, 2012 9:07 AM<br>
<b><span style="font-weight:bold">To:</span></b> Matt Clough; <st1:PersonName w:st="on">
equest-users@lists.onebuilding.org</st1:PersonName><br>
<b><span style="font-weight:bold">Subject:</span></b> Re: [Equest-users] Unmet Hours</span></font><o:p></o:p></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:
12.0pt"><o:p> </o:p></span></font></p>
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<p class="MsoNormal" style="background:white"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt;color:black">Matt:<o:p></o:p></span></font></p>
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<p class="MsoNormal" style="background:white"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></font></p>
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<p class="MsoNormal" style="background:white"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt;color:black">I will look at your run later. But for the VAVs, make sure your thermostats are reverse acting, then increase the deadband
to 4 or even 6 deg F.<o:p></o:p></span></font></p>
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<p class="MsoNormal" style="background:white"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></font></p>
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<p class="MsoNormal" style="background:white"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt;color:black">John Aulbach<o:p></o:p></span></font></p>
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<p class="MsoNormal" style="background:white"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt;color:black">Partner Energy<o:p></o:p></span></font></p>
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<p class="MsoNormal" style="background:white"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></font></p>
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<p class="MsoNormal" style="background:white"><b><font size="2" color="black" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:black;
font-weight:bold">From:</span></font></b><font size="2" color="black" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:black">
Matt Clough <mclough@kme-inc.com><br>
<b><span style="font-weight:bold">To:</span></b> "<st1:PersonName w:st="on">equest-users@lists.onebuilding.org</st1:PersonName>" <<st1:PersonName w:st="on">equest-users@lists.onebuilding.org</st1:PersonName>>
<br>
<b><span style="font-weight:bold">Sent:</span></b> Friday, March 16, 2012 8:00 AM<br>
<b><span style="font-weight:bold">Subject:</span></b> [Equest-users] Unmet Hours</span></font><font color="black"><span style="color:black"><o:p></o:p></span></font></p>
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<p class="MsoNormal" style="background:white"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></font></p>
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<p class="MsoNormal" style="background:white"><font size="2" color="black" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:black">All right Folks,</span></font><font color="black"><span style="color:black"><o:p></o:p></span></font></p>
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<p class="MsoNormal" style="background:white"><font size="2" color="black" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:black"> </span></font><font color="black"><span style="color:black"><o:p></o:p></span></font></p>
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<p class="MsoNormal" style="background:white"><font size="2" color="black" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:black">It’s time to do that thing again where we talk about unmet hours. I’ll give a little background first: I’m
new to equest and to the HVAC industry, so bear with me. The project is a 1F school building (pre-k) with a clerestory, split into 10 zones and predominantly served by series VAV terminals using chilled water and hot water loops. It’s in
<st1:place w:st="on"><st1:City w:st="on">Houston</st1:City> , <st1:State w:st="on">
TX</st1:State></st1:place> so and are no economizers. I’ve spent the majority of the past few days reading previous discussions and trying a variety of changes. I have attached the INP and PD2 for convenience.</span></font><font color="black"><span style="color:black"><o:p></o:p></span></font></p>
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<p class="MsoNormal" style="background:white"><font size="2" color="black" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:black"> </span></font><font color="black"><span style="color:black"><o:p></o:p></span></font></p>
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<p class="MsoNormal" style="background:white"><font size="2" color="black" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:black">I initially tried to represent the system based on the mechanical/electrical schedules, but that yielded many
unmet hours (99%), so it is currently set to auto-size, but am still at about 600 unmet hours (7%). 7 of the zones are series VAV, 2 are single-zone with reheat, and one is a packaged single zone for the MDF room.</span></font><font color="black"><span style="color:black"><o:p></o:p></span></font></p>
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<ul type="disc">
<li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l1 level1 lfo2;background:white">
<font size="2" color="black" face="Arial"><span style="font-size:10.0pt;font-family:Arial">Changing to an auto-sized system provided a large reduction in UH.
</span></font><o:p></o:p></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l1 level1 lfo2;background:white">
<font size="2" color="black" face="Arial"><span style="font-size:10.0pt;font-family:Arial">am trying to not manipulate the data by adjusting the cooling/heating ratio.
</span></font><o:p></o:p></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l1 level1 lfo2;background:white">
<font size="2" color="black" face="Arial"><span style="font-size:10.0pt;font-family:Arial">The setpoints are 75c/72h. I tried changing them a few degrees in either direction, but did not get a large enough reduction.
</span></font><o:p></o:p></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l1 level1 lfo2;background:white">
<font size="2" color="black" face="Arial"><span style="font-size:10.0pt;font-family:Arial">have the fans cycling at night (no OA), which did help reduce the hours</span></font>
<o:p></o:p></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l1 level1 lfo2;background:white">
<font size="2" color="black" face="Arial"><span style="font-size:10.0pt;font-family:Arial">switched into DDE and set actual CFM from the mechanical plans. This resulted in an increase</span></font>
<o:p></o:p></li></ul>
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<p class="MsoNormal" style="background:white"><font size="2" color="black" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:black"> </span></font><font color="black"><span style="color:black"><o:p></o:p></span></font></p>
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<p class="MsoNormal" style="background:white"><font size="2" color="black" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:black">As I am looking through the LS-B report, it seems like some of my zone loads might be a little high with some
of the heat generation loads at about 12kbtu/h. I think my inexperience hampers my ability to troubleshoot some of the problems because I don’t necessarily have a good sense for what a reasonable result/prediction is.
</span></font><font color="black"><span style="color:black"><o:p></o:p></span></font></p>
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<p class="MsoNormal" style="background:white"><font size="2" color="black" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:black"> </span></font><font color="black"><span style="color:black"><o:p></o:p></span></font></p>
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<p class="MsoNormal" style="background:white"><font size="2" color="black" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:black">I appreciate any assistance on this matter and am open to suggestions as far as proper modeling techniques and
troubleshooting methods.</span></font><font color="black"><span style="color:black"><o:p></o:p></span></font></p>
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<p class="MsoNormal" style="background:white"><font size="2" color="black" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:black"> </span></font><font color="black"><span style="color:black"><o:p></o:p></span></font></p>
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<p class="MsoNormal" style="background:white"><font size="2" color="black" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:black">Sincerely,</span></font><font color="black"><span style="color:black"><o:p></o:p></span></font></p>
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<p class="MsoNormal" style="background:white"><font size="2" color="black" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:black">Matt Clough</span></font><font color="black"><span style="color:black"><o:p></o:p></span></font></p>
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<p class="MsoNormal" style="background:white"><font size="2" color="black" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:black">Mechanical Designer</span></font><font color="black"><span style="color:black"><o:p></o:p></span></font></p>
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<p class="MsoNormal" style="background:white"><font size="2" color="black" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:black">KME Engineering</span></font><font color="black"><span style="color:black"><o:p></o:p></span></font></p>
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