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<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;
font-family:Arial">All right Folks,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;
font-family:Arial"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;
font-family:Arial">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.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;
font-family:Arial"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;
font-family:Arial">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.<o:p></o:p></span></font></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoNormal" style="mso-list:l0 level1 lfo5"><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:Arial">Changing to an auto-sized system provided a large reduction in UH.
<o:p></o:p></span></font></li><li class="MsoNormal" style="mso-list:l0 level1 lfo5"><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:Arial">am trying to not manipulate the data by adjusting the cooling/heating ratio.
<o:p></o:p></span></font></li><li class="MsoNormal" style="mso-list:l0 level1 lfo5"><font size="2" 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.
<o:p></o:p></span></font></li><li class="MsoNormal" style="mso-list:l0 level1 lfo5"><font size="2" 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<o:p></o:p></span></font>
</li><li class="MsoNormal" style="mso-list:l0 level1 lfo5"><font size="2" 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<o:p></o:p></span></font>
</li></ul>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;
font-family:Arial"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;
font-family:Arial">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.
<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;
font-family:Arial"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;
font-family:Arial">I appreciate any assistance on this matter and am open to suggestions as far as proper modeling techniques and troubleshooting methods.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;
font-family:Arial"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;
font-family:Arial">Sincerely,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;
font-family:Arial">Matt Clough<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;
font-family:Arial">Mechanical Designer<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;
font-family:Arial">KME Engineering<o:p></o:p></span></font></p>
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