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Remember that eQUEST doesn't <i>really</i> do DOAS yet. All it
does is set the OA temperature for the borrowing zone using the
OA-FROM keyword to the RA temperature of the "lending" system (which
is why it has to come first on the system list). <br>
<br>
I really hope this changes in future releases! <br>
<br>
On 10/19/2010 7:25 PM, Carol Gardner wrote:
<blockquote
cite="mid:AANLkTinR-kjpxkzM0Z3_MgeGm0Ue4TotPEmCfUpoHt4B@mail.gmail.com"
type="cite">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 moz-do-not-send="true"
href="mailto:joe.fleming@tlc-eng.com">joe.fleming@tlc-eng.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt
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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;
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AP BD+C, BEMP</span></i></p>
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-- <br>
Carol Gardner PE<br>
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