Are you willing to share your .inp and .pd2 input decks? I would take a quick look if you are.<br><br>Carol<br><br><div class="gmail_quote">On Tue, Oct 19, 2010 at 12:40 PM, Fleming, Joe <span dir="ltr"><<a href="mailto:joe.fleming@tlc-eng.com">joe.fleming@tlc-eng.com</a>></span> wrote:<br>
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<p class="MsoNormal">I know this topic has been beaten like..., but the results I
have been getting for the ## hours on a model with several DOAS's are horrible,
(getting a little delirious at this point). There is a DOAS for each
system with a different schedule than the next. Each DOAS has an ERV
which operates with a DH of 2.0btuh/hr in cool/heat and float. </p>
<p class="MsoNormal">I feel like the problem is within the dummy zone or the
schedules. </p>
<p class="MsoNormal">When I assign the DOAS air to the SZRH unit as OA from
System the cooling load shoots up by about 50%, (even when I remove the ERV the
results are similar, increased cooling). </p>
<p class="MsoNormal">The building is in a moderate climate zone.</p>
<p class="MsoNormal">The DOAS fan schedule is set to on at the same time as the SZRH
unit.</p>
<p class="MsoNormal">The heating energy is reduced when I assign the DOAS.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">The problems I see are, to list a few;</p>
<p class="MsoNormal">The dummy zone has all of its hours outside of the
throttling range no matter how it is assigned and no matter what the t-stat schedule
I assign.</p>
<p class="MsoNormal">The load doesn't budge once I remove the DOAS from the
model, only when I add it to the SZRH unit as OA from system.</p>
<p class="MsoNormal">The DOAS does not show any heating load, only cooling load
all year long (again moderate climate with cold seasons).</p>
<p class="MsoNormal">DOAS's have been done before without this problem, maybe adding
too much info this time.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><u>*How is the DOAS operating in eQuest?</u></p>
<p class="MsoNormal">Taking a stab I assume it is bringing in the OA and cooling
it or heating it to whatever the temperature set-points are. Depending on
the schedules the temp could be floating most of the time. The air is
then brought into your secondary system at set-point or floating point. The
OA from the zones attached to the secondary system are replaced by the OA from the
DOAS. (?) Then the secondary system does its thing as usual. </p>
<p class="MsoNormal">(Not sure what is happening with the dummy zone? Does DZ
care it gets any air? Looks like it does because of the unmet
hours. Does the secondary system pick up the air from the DOAS after it
has traveled through a space and picked up load? The dummy zone has no
load but it's temp is always above 85.)</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Now for the cooling to be increasing, the air must be coming
in to the secondary system warmer than usual during cooling hours. (usual
being the raw temperature of uncond outdoor air). But the results
seem extreme.</p>
<p class="MsoNormal">For the heating to be decreasing the air must be coming in
warmer than usual for the secondary system, which it is based on SS-O.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Does anyone have experience with this and what could be
going wrong? </p>
<p class="MsoNormal"><u>*Or, can someone link me to a basic DOAS goby? </u></p>
<p class="MsoNormal">I have searched the archives but many of the DOAS questions
have gone unanswered in the past.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Thank You</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><b>Joe Fleming</b></p>
<p class="MsoNormal"><i><span style="font-size: 10pt; color: rgb(51, 51, 51);">E.I., LEED
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<br></blockquote></div><br><br clear="all"><br>-- <br>Carol Gardner PE<br>
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