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Do the baseboards, once you click yes it is all automatic. If you have
a lot of zones use the summary tab and go down the list. The baseboard
heat will be broken out in your sim so you know what the contribution
is in each zone. I had a zone this week with 13000 hrs, the adjust
loads adjustment was missed, this brought the problem down to 1000 hrs,
changing the zone command got me to 300 hrs. Even with baseboards that
was the best I could do with a constant volume system on that zone. I
was running 4 deg throttling range.<br>
Bruce<br>
<br>
On 11/06/2010 12:39 PM, Dakota Kelley wrote:
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<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">Robert,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">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: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">Thanks,<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left: 0.5in; text-indent: 27pt;"><b><span
style="font-size: 10pt; font-family: "Franklin Gothic Book","sans-serif";">DAKOTA
KELLEY
</span></b><b><o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left: 0.5in; text-indent: 27pt;"><span
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| Energy Analyst<o:p></o:p></span></p>
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<o:p></o:p></span></p>
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</span><span
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214.744.6199
<o:p></o:p></span></p>
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Cell: 214.280.3825<o:p></o:p></span></p>
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Fax: 214.744.0770</span><span
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</span><span
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<p class="MsoNormal"><a moz-do-not-send="true"
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Travis St. Suite 115<o:p></o:p></span></p>
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</span><span
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<p class="MsoNormal"><span
style="font-size: 8pt; font-family: "Franklin Gothic Book","sans-serif"; color: rgb(51, 51, 255);">|
MEP ENGINEERING · ENERGY MODELING · LEED CONSULTATION ·
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<o:p></o:p></span></p>
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<div>
<div
style="border-style: solid none none; border-color: rgb(181, 196, 223) -moz-use-text-color -moz-use-text-color; border-width: 1pt medium medium; padding: 3pt 0in 0in;">
<p class="MsoNormal"><b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif"; color: windowtext;">From:</span></b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif"; color: windowtext;">
Bruce Easterbrook
[<a class="moz-txt-link-freetext" href="mailto:bruce5@bellnet.ca">mailto:bruce5@bellnet.ca</a>] <br>
<b>Sent:</b> Friday, June 11, 2010 6:33 AM<br>
<b>Cc:</b> <a class="moz-txt-link-abbreviated" href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><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: 12pt;">pasha<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">On Thu, Jun 10, 2010 at 7:38 PM, Robert Des
Rosiers <<a moz-do-not-send="true"
href="mailto:desrosiers@studioma.com">desrosiers@studioma.com</a>>
wrote:<o:p></o:p></p>
<div>
<div>
<p class="MsoNormal" style="">All:<o:p></o:p></p>
<p class="MsoNormal" style="">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=""> <o:p></o:p></p>
<p class="MsoNormal" style="">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=""> <o:p></o:p></p>
<p class="MsoNormal" style="">Any
guidance is greatly appreciated. Thanks -<o:p></o:p></p>
<p class="MsoNormal" style=""> <o:p></o:p></p>
<p class="MsoNormal" style=""><span style="color: rgb(31, 73, 125);">Robert
Des Rosiers, LEED-AP</span><o:p></o:p></p>
<p class="MsoNormal" style=""><b><span
style="color: rgb(31, 73, 125);">STUDIO MA</span></b><o:p></o:p></p>
<p class="MsoNormal" style=""><span style="color: rgb(31, 73, 125);">130
N Central Avenue, No.300 Phoenix, Arizona 85004</span><o:p></o:p></p>
<p class="MsoNormal" style=""><span style="color: rgb(31, 73, 125);">Telephone
602 251 3800</span><o:p></o:p></p>
<p class="MsoNormal" style=""><span style="color: rgb(31, 73, 125);">Fax
602 251 3100</span><o:p></o:p></p>
<p class="MsoNormal" style=""> <o:p></o:p></p>
</div>
</div>
<p class="MsoNormal" style="margin-bottom: 12pt;"><br>
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<p class="MsoNormal"><br>
<br>
<o:p></o:p></p>
<pre><o:p> </o:p></pre>
<pre><o:p> </o:p></pre>
<pre>_______________________________________________<o:p></o:p></pre>
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