<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><div><span>Matt:</span></div><div><br><span></span></div><div><span>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.</span></div><div><br><span></span></div><div><span>John Aulbach</span></div><div><span>Partner Energy</span></div><div><br></div> <div style="font-family: times new roman, new york, times, serif; font-size: 12pt;"> <div style="font-family: times new roman, new york, times, serif; font-size: 12pt;"> <div dir="ltr"> <font face="Arial" size="2"> <hr size="1"> <b><span style="font-weight:bold;">From:</span></b> Matt Clough <mclough@kme-inc.com><br> <b><span style="font-weight: bold;">To:</span></b> "equest-users@lists.onebuilding.org" <equest-users@lists.onebuilding.org> <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<br> </font> </div> <br><div id="yiv1505557420">
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<div class="yiv1505557420MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">All right Folks,</span></font></div>
<div class="yiv1505557420MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;"> </span></font></div>
<div class="yiv1505557420MsoNormal"><font face="Arial" size="2"><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
Houston ,
TX 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></div>
<div class="yiv1505557420MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;"> </span></font></div>
<div class="yiv1505557420MsoNormal"><font face="Arial" size="2"><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.</span></font></div>
<ul style="margin-top:0in;" type="disc">
<li class="yiv1505557420MsoNormal" style=""><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Changing to an auto-sized system provided a large reduction in UH.
</span></font></li><li class="yiv1505557420MsoNormal" style=""><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">am trying to not manipulate the data by adjusting the cooling/heating ratio.
</span></font></li><li class="yiv1505557420MsoNormal" style=""><font face="Arial" size="2"><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></li><li class="yiv1505557420MsoNormal" style=""><font face="Arial" size="2"><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>
</li><li class="yiv1505557420MsoNormal" style=""><font face="Arial" size="2"><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>
</li></ul>
<div class="yiv1505557420MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;"> </span></font></div>
<div class="yiv1505557420MsoNormal"><font face="Arial" size="2"><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.
</span></font></div>
<div class="yiv1505557420MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;"> </span></font></div>
<div class="yiv1505557420MsoNormal"><font face="Arial" size="2"><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.</span></font></div>
<div class="yiv1505557420MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;"> </span></font></div>
<div class="yiv1505557420MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Sincerely,</span></font></div>
<div class="yiv1505557420MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Matt Clough</span></font></div>
<div class="yiv1505557420MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">Mechanical Designer</span></font></div>
<div class="yiv1505557420MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;font-family:Arial;">KME Engineering</span></font></div>
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