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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Robert,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>50,000 hours is much more than I would anticipate for a capacity
issue. You are essentially describing a hydronic VAVT system, which is begging
for unmet heating hours if there is a lot of diversity in the zones’ demands
and no reheat capabilities. My experience has been that eQUEST over-sizes hot
water systems, and this is exacerbated if the “simple” method is used to define
the windows. It can be as much as 250%-300%. That many hours sounds like the
system is not functioning as intended – almost as if the heating loop is not
assigned to the zones/system, or something similar. Or, not having reheat
could be inappropriate for the building use or climate. Regardless, adding
zone reheat as Bruce and Pasha indicated should make a huge difference.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Thanks,<o:p></o:p></span></p>
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<p class=MsoNormal style='margin-left:.5in;text-indent:27.0pt'><b><span
style='font-size:10.0pt;font-family:"Franklin Gothic Book","sans-serif"'>DAKOTA
KELLEY </span></b><b><o:p></o:p></b></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:27.0pt'><span
style='font-size:10.0pt;font-family:"Franklin Gothic Book","sans-serif"'>Project
Designer | Energy Analyst<o:p></o:p></span></p>
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<o:p></o:p></span></p>
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</span><span style='font-size:8.0pt;font-family:"Franklin Gothic Book","sans-serif"'>Office:
214.744.6199 <o:p></o:p></span></p>
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<p class=MsoNormal><a href="http://www.teliospc.com/"><span style='font-size:
8.0pt;font-family:"Franklin Gothic Book","sans-serif"'>http://www.teliospc.com </span></a><span
style='font-size:8.0pt;font-family:"Franklin Gothic Book","sans-serif"'> 3535
Travis St. Suite 115<o:p></o:p></span></p>
<p class=MsoNormal><a href="mailto:dakotak@teliospc.com"><span
style='font-size:8.0pt;font-family:"Franklin Gothic Book","sans-serif"'>dakotak@teliospc.com</span></a><span
style='font-size:10.0pt;font-family:"Franklin Gothic Book","sans-serif"'> </span><span
style='font-size:8.0pt;font-family:"Franklin Gothic Book","sans-serif"'>Dallas,
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color:#1F497D'> <o:p></o:p></span></p>
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color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:
"Tahoma","sans-serif";color:windowtext'> Bruce Easterbrook
[mailto:bruce5@bellnet.ca] <br>
<b>Sent:</b> Friday, June 11, 2010 6:33 AM<br>
<b>Cc:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] Excessive Unmet Heating Load Hours withan
Auto-Sized HVAC System<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>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>
<br>
On 10/06/2010 10:55 PM, Pasha Korber-Gonzalez wrote: <o:p></o:p></p>
<div>
<p class=MsoNormal>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.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>by adding baseboards for the additional requrired heat then
you should be able to meet your heating loads.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>hope this helps,<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'>pasha<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>On Thu, Jun 10, 2010 at 7:38 PM, Robert Des Rosiers <<a
href="mailto:desrosiers@studioma.com">desrosiers@studioma.com</a>> wrote:<o:p></o:p></p>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>All:<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>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.<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>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><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Any
guidance is greatly appreciated. Thanks -<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='color:#1F497D'>Robert Des Rosiers, LEED-AP</span><o:p></o:p></p>
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style='color:#1F497D'>STUDIO MA</span></b><o:p></o:p></p>
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<pre><o:p> </o:p></pre><pre><o:p> </o:p></pre><pre>_______________________________________________<o:p></o:p></pre><pre>Equest-users mailing list<o:p></o:p></pre><pre><a
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