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<font face="Times New Roman, Times, serif">In your air side HVAC
section go into the zone level and check that your sizing option is set
to "adjust loads". If it is from loads go to the summary tab and
change all your zones. Also beside that is throttling range, you can
try adjusting that upwards say to 4 deg. You can also change your
control zone to see it this helps. If your AHU is off at night you can
also adjust it to come on before the occupancy. You SS-O report will
show this if the hours are lumped near the start up time. Then add
more heat as Pasha said.<br>
Bruce Easterbrook P.Eng.<br>
Abode Engineering<br>
</font><br>
On 10/06/2010 10:55 PM, Pasha Korber-Gonzalez wrote:
<blockquote
cite="mid:AANLkTil3S_JgwdLM6LJJMcWGGvXCac0HxrNmphoSdQU_@mail.gmail.com"
type="cite">
<div>I have found with my own projects that even sometimes when the
HVAC designer has specified a specific capacity for htg water equipment
that sometime in my model file I still have unmet loads for htg. I
suggest at this point specify additional htg capacity by either
increasing the reheat delta-T from say 30F to 50F and/or adding zone
level baseboards. By adding the baseboards you are adding a component
of the system that will supplement the skin losses being experienced by
the simulation model.</div>
<div> </div>
<div>by adding baseboards for the additional requrired heat then you
should be able to meet your heating loads.</div>
<div> </div>
<div>hope this helps,</div>
<div>pasha<br>
<br>
</div>
<div class="gmail_quote">On Thu, Jun 10, 2010 at 7:38 PM, Robert Des
Rosiers <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:desrosiers@studioma.com">desrosiers@studioma.com</a>></span>
wrote:<br>
<blockquote
style="border-left: 1px solid rgb(204, 204, 204); margin: 0px 0px 0px 0.8ex; padding-left: 1ex;"
class="gmail_quote">
<div vlink="purple" link="blue" lang="EN-US">
<div>
<p class="MsoNormal">All:</p>
<p class="MsoNormal">I have completed an energy model for a
baseline scenario from which to compare my proposed design. The
baseline HVAC system is a constant volume single zone AHU w/ no reheat;
the AHU is served by HW and CHW loop from a central plant. I have set
this up in eQuest as a "Variable Air Volume" system type with the AHU
fan control set to "Constant Volume"; my thought here is that each zone
fed by the AHU will control temperature using a VAV box w/ no local
reheat or cooling. Flow and temperature from the AHU will be delivered
based on the coolest or warmest zone it serves.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">All seems fine with the design flows,
ventilation flows and cooling capacities. My problem is with the
heating capacity as I have excessive unmet heating hours (50,000). I
have allowed eQuest to size the heating capacity of the preheat and
heating coil as well as the minimum flow ratios. <u>Does anyone have
any thoughts as to what is causing these unmet heating load hours? Is
the way I have set-up the desired baseline HVAC system incorrect?</u></p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Any guidance is greatly appreciated. Thanks -</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Robert
Des Rosiers, LEED-AP</span></p>
<p class="MsoNormal"><b><span style="color: rgb(31, 73, 125);">STUDIO
MA</span></b></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">130 N
Central Avenue, No.300 Phoenix, Arizona 85004</span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Telephone
602 251 3800</span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Fax 602
251 3100</span></p>
<p class="MsoNormal"> </p>
</div>
</div>
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