In my eQuest adventures i have come across the same thing. I created a model and assigned a VAV system to the whole building. I got one plenum space per shell. Then i created a heat pump system that had "system per zone" default and it created individual plenums. I think it depends on the selection of the system and whether it is system per zone/floor/shell/etc. <br>
<br>To recreate them, i just used the system per zone in the wizard, and in the DD edit i changed the systems as i saw fit and reassigned zones to the correct layout. This is easier to me than creating all those spaces, and then creating all the walls, and then creating all the thermal zones.<br>
<br>Hope this helps a little,<br><br>Rob<br><br><div class="gmail_quote">On Thu, Jun 24, 2010 at 2:32 PM, Nick Caton <span dir="ltr"><<a href="mailto:ncaton@smithboucher.com">ncaton@smithboucher.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
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<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Connor,</span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">For a 90.1 baseline/proposed comparison
scenario… I’m not certain whether a “combined plenum” in
one case is acceptable. A strict reading of Appendix G would lead me to
say “no,” but if all plenum zones are generally unconditioned
spaces without systems, the only difference in modeled behavior should be the
thermal lag/buffer between adjacent plenum zones from the partition
constructions (assuming the wizards don’t make “air” type wall
surfaces when generating individual plenums…). That would probably
not be significant in many cases. It might make a significant difference if
you have core/perimeter terminal units using the plenum as a return air path I
suppose…</span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">The wizards are frankly cryptic
in how they generate plenums for your spaces – I think it involves
whether you have a “system per zone” assigned to the shell…
perhaps zone group definitions play a role, not sure… This has led
me into the same situation, with two comparative models having different plenum
layouts.</span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">I do not know of any easy/fast way
to recreate or a ton of plenum zones and their associations/surfaces between
two complex models, when they’ve been combined into one. This is
the sort of things that’s scattered throughout an .inp file, so it wouldn’t
be something easy to just copy-paste… if it’s an option and
you have the time, I would advise trying to wrangle the wizards into creating the
same plenum configuration in both models, but it would require some guesswork
to figure out how!</span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">~Nick</span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"> </span></p>
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<p class="MsoNormal"><b><span style="color: rgb(45, 77, 94);"> </span></b></p>
<p class="MsoNormal"><b><span style="color: rgb(45, 77, 94);">NICK CATON, E.I.T.</span></b><b><span style="font-size: 12pt; color: rgb(45, 77, 94);"></span></b></p>
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<p class="MsoNormal"><b><span style="font-size: 10pt;">From:</span></b><span style="font-size: 10pt;"> <a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>
[mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>Jansen,
Connor<br>
<b>Sent:</b> Thursday, June 24, 2010 12:51 PM<br>
<b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] Recreating Plenum Spaces</span></p>
</div>
</div><div><div></div><div class="h5">
<p class="MsoNormal"> </p>
<p class="MsoNormal">Hello All,</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I’m looking for some insight on how plenum zones may
or may not affect my modeling outcome.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">The building in question has changed from a 90.1 baseline
system type 6 Packaged VAV to a system 4 Packaged Single zone. The model is
currently using a single plenum zone for the entire floor. I’ve noticed
in the past (correct me if I’m wrong) that when assigning spaces to HVAC
systems in the wizard it will output individual plenum spaces for corresponding
zones when using single zone HVAC systems and a combined plenum space when
using multizone systems.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Is it necessary to recreate the individual plenums in the
detailed mode if I switch to single zone systems? If so is there a simple way
of doing this?</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Thank you for the help.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Regards,</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Connor</p>
</div></div></div>
</div>
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<br></blockquote></div><br><br clear="all"><br>-- <br>Rob Hudson<br>