<div>sometimes unmet load hours are logged during the morning start-up warm-up periods. What's happening is that for every zone (at every hour) the program is trying to meet the loads with in a 60 minute (1 hour) approach. If you have a building that has intense internal loads occuring right at the hour of start-up or warm-up operations it will take more than 60 minutes to get that space fully conditioned, so now you have 1 hour (per zone) logged as "hours unmet."</div>
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<div>I don't have the chance now to look at your sim file, but maybe set your start-up schedules to give a 2 or 3 hour building warm-up cycle and see if that helps your unmet loads.</div>
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<div>that's my quick thought/2-cents.</div>
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<div>pkg<br><br></div>
<div class="gmail_quote">On Wed, Jul 21, 2010 at 11:30 AM, Martz, Amanda <span dir="ltr"><<a href="mailto:amartz@klingstubbins.com">amartz@klingstubbins.com</a>></span> wrote:<br>
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<p class="MsoNormal"><font size="2" face="Arial"><span style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">I have reverse action set, a range of 6 degrees, night cycling set to “cycle on any,” and a 20 degree delta T. You’re right, those usually do the trick, that’s why I’m so stumped. </span></font></p>
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<p class="MsoNormal"><b><font size="2" face="Tahoma"><span style="FONT-FAMILY: Tahoma; FONT-SIZE: 10pt; FONT-WEIGHT: bold">From:</span></font></b><font size="2" face="Tahoma"><span style="FONT-FAMILY: Tahoma; FONT-SIZE: 10pt"> Amber Welsh [mailto:<a href="mailto:amber@timmonsdesigneng.com" target="_blank">amber@timmonsdesigneng.com</a>] <br>
<b><span style="FONT-WEIGHT: bold">Sent:</span></b> Wednesday, July 21, 2010 1:28 PM<br><b><span style="FONT-WEIGHT: bold">To:</span></b> Martz, Amanda<br><b><span style="FONT-WEIGHT: bold">Subject:</span></b> RE: [Equest-users] Ashrae Baseline Model & Unmet loads</span></font></p>
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<p class="MsoNormal"><font color="#1f497d" size="2" face="Calibri"><span style="FONT-FAMILY: Calibri; COLOR: #1f497d; FONT-SIZE: 11pt">Amanda,</span></font></p>
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<p class="MsoNormal"><font color="#1f497d" size="2" face="Calibri"><span style="FONT-FAMILY: Calibri; COLOR: #1f497d; FONT-SIZE: 11pt">When I first had these problems it had to do with fan control and night cycling. Make sure that your fans are cycling. Next, check to make sure that you have a minimum delta T of 20 between room set point and supply air temperature. These are the 2 biggest things affecting the unmet hours.</span></font></p>
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<p class="MsoNormal"><font color="#1f497d" size="2" face="Calibri"><span style="FONT-FAMILY: Calibri; COLOR: #1f497d; FONT-SIZE: 11pt">Amber</span></font></p>
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<p class="MsoNormal"><b><font size="2" face="Tahoma"><span style="FONT-FAMILY: Tahoma; FONT-SIZE: 10pt; FONT-WEIGHT: bold">From:</span></font></b><font size="2" face="Tahoma"><span style="FONT-FAMILY: Tahoma; FONT-SIZE: 10pt"> <a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a> [mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>] <b><span style="FONT-WEIGHT: bold">On Behalf Of </span></b>Martz, Amanda<br>
<b><span style="FONT-WEIGHT: bold">Sent:</span></b> Wednesday, July 21, 2010 1:22 PM<br><b><span style="FONT-WEIGHT: bold">To:</span></b> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
<b><span style="FONT-WEIGHT: bold">Subject:</span></b> [Equest-users] Ashrae Baseline Model & Unmet loads</span></font></p></div></div>
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<p class="MsoNormal"><font size="2" face="Arial"><span style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">I have several VAV units with reheat serving several zones in my Ashrae baseline model. It is autosizing all of the capacities, so why would I have unmet loads? I have cooling and heating set to size at 1.15 and 1.25 as Ashrae states, and I have cooling control set to “warmest.” I’m sure it is a control issue, but I can’t figure out what exactly it is. I attached my model, any help would be very greatly appreciated!</span></font></p>
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<p style="LINE-HEIGHT: 15pt" class="MsoNormal"><font size="1" face="Arial Black"><span style="FONT-FAMILY: 'Arial Black'; FONT-SIZE: 8pt">Amanda E. Martz, EIT, LEED AP</span></font></p>
<p style="LINE-HEIGHT: 15pt; MARGIN-BOTTOM: 12pt" class="MsoNormal"><font size="1" face="Arial Black"><span style="FONT-FAMILY: 'Arial Black'; FONT-SIZE: 8pt">Mechanical Engineer</span></font></p>
<p style="LINE-HEIGHT: 15pt" class="MsoNormal"><font color="black" size="1" face="Arial Black"><span style="FONT-FAMILY: 'Arial Black'; COLOR: black; FONT-SIZE: 8pt">KlingStubbins</span></font></p>
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<font size="1" face="Arial"><span style="FONT-FAMILY: Arial; FONT-SIZE: 8pt">19103</span></font></p>
<p style="LINE-HEIGHT: 15pt" class="MsoNormal"><font size="1" face="Arial"><span style="FONT-FAMILY: Arial; FONT-SIZE: 8pt">P 215.569.2900, ext. 3612</span></font></p>
<p style="LINE-HEIGHT: 15pt" class="MsoNormal"><font size="1" face="Arial"><span style="FONT-FAMILY: Arial; FONT-SIZE: 8pt">F 215.569.5963<br>E <a href="mailto:amartz@klingstubbins.com" target="_blank">amartz@klingstubbins.com</a> <br>
W <a href="http://www.klingstubbins.com/" target="_blank">www.klingstubbins.com</a></span></font></p>
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