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<p class="MsoNormal"><span style="color:#1F497D">My past efforts at approximating DOAS and MAU (makeup air unit) setups in eQuest have sometimes paralleled the approach Bill is describing.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Some extra thoughts/cautions from my experience:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo3"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Common scenario: A DOAS pre-conditions or does not condition ventilation air beyond heat recovery before supplying to the main conditioning units, which mix that OA with the return airstream and heats/cools
as needed to arrive at the intended supply air conditions. <o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo3"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">An important point is this approach “circumvents” typical supply air conditioning means by dumping the associated ventilation loads (after any DOAS-borne recovery & pre-conditioning) “directly” into
the spaces. This may have effects of: <o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l1 level2 lfo3">
<![if !supportLists]><span style="font-family:"Courier New";color:#1F497D"><span style="mso-list:Ignore">o<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Overstating the actual ventilation loads to be dealt with(where return/relief air would otherwise mitigate/eliminate)<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l1 level2 lfo3">
<![if !supportLists]><span style="font-family:"Courier New";color:#1F497D"><span style="mso-list:Ignore">o<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">“Moving” where ventilation loads are dealt with from a central system to terminal (zonal) units,<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l1 level2 lfo3">
<![if !supportLists]><span style="font-family:"Courier New";color:#1F497D"><span style="mso-list:Ignore">o<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Causing the conditioned zones to call for heating/cooling where they might otherwise call for the opposite, which may throw off expected behaviors, terminal unit sizing, and in some cases may have effects
on how well the main conditioning units handle the situation (i.e. unmet hours)<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l1 level2 lfo3">
<![if !supportLists]><span style="font-family:"Courier New";color:#1F497D"><span style="mso-list:Ignore">o<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Example for illustration: Typical office building with a DOAS, furnace heated air handler which delivers 55 degree SAT, and electric reheat VAV boxes. A core office zone might call for cooling from
the main system in the winter (internal loads dominant), but the DOAS-supplied (and air wall transferred) ventilation air loads may instead turn the space into a refrigerator for the hour, so the zone thermostat would calling for heating instead… suddenly
your whole building is dealing with all your wintertime ventilation heating with electricity instead of gas as anticipated.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">You can try to compensate for some of these effects by moving or mirroring your main air handling conditioning sources/capacities into the DOAS system, but at some point you’re facing a potential documentation
nightmare for LEED or similar…<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I don’t mean to be a negative Nancy – this is the clearest procedural write-up I’ve run into for a “dummy zone” approach to DOAS behavior (more on this in the archives). <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">The other major alternatives to a “dummy zone” workaround are, in brief:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l2 level1 lfo4"><![if !supportLists]><span style="font-family:Symbol;color:#1F497D"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Opt to <u>not</u> model the DOAS system as a separate system for the simulation, and instead define its components within the served systems. Put another way: Add heat recovery recovery/pre-conditioning/fan
power/etc in proportion to the systems the DOAS serves.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l2 level1 lfo4"><![if !supportLists]><span style="font-family:Symbol;color:#1F497D"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Look to software other than eQuest if none of these approximations are acceptable.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">~Nick<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span style="color:#1F497D"><img width="119" height="37" id="Picture_x0020_1" src="cid:image001.jpg@01CEDB0A.32905A00" alt="cid:489575314@22072009-0ABB"></span><b><span style="font-family:"Stylus BT","sans-serif";color:#2D4D5E"><o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-family:"Stylus BT","sans-serif";color:#2D4D5E"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:12.0pt;font-family:"Stylus BT","sans-serif";color:#2D4D5E">NICK CATON, P.E.<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:7.5pt;color:#CC9900">SENIOR ENGINEER<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:7.5pt;color:#CC9900"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#2D4D5E">Smith & Boucher Engineers</span><span style="font-size:7.5pt;font-family:"Times New Roman","serif";color:#CC9900"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#2D4D5E">25501 west valley parkway, suite 200<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#2D4D5E">olathe, ks 66061<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#2D4D5E">direct 913.344.0036<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#2D4D5E">fax 913.345.0617<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><a href="www.smithboucher.com" title="blocked::www.smithboucher.com"><span style="font-size:10.0pt">www.smithboucher.com</span></a></span><u><span style="font-size:10.0pt;color:blue">
</span></u><span style="color:#1F497D"><o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Bishop, Bill<br>
<b>Sent:</b> Wednesday, November 06, 2013 2:29 PM<br>
<b>To:</b> Bishop, Bill; Hall, Brendan; equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] NEW (?) eQUEST DOAS workaround using plenum spaces<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Correction – ceiling surfaces are created for the conditioned spaces below the plenum spaces, so the change to “air wall” is made for the space below, not in the plenum space. You do, however, need to change
the plenum zones to “conditioned” in order to assign OA to them. I’m also thinking it might make sense to assign thermostat schedules to one or more DOAS plenum zones, to control whether the DOAS is in heating or cooling mode. You could use schedules with
lower heating, higher cooling temps and/or larger throttling range and/or different t-stat type, in order to avoid increasing the reported unmet load hours.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">~Bill<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
<a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a> [<a href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>Bishop, Bill<br>
<b>Sent:</b> Wednesday, November 06, 2013 2:47 PM<br>
<b>To:</b> Hall, Brendan; <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Equest-users] NEW (?) eQUEST DOAS workaround using plenum spaces<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">You make no changes to the plenum space geometry as it is normally created via the eQUEST wizard, except to make sure there is a ceiling, and change the ceiling surface TYPE to “Air”. I used the “Default Air
Wall Construction” which has a U-value of 2.7 Btu/ft2-hr. I’m not sure about DESIGN-COOL-T and DESIGN-HEAT-T. I think you would want them to represent the DOAS SAT, so that the system(s) serving the occupied zones below can be autosized accordingly (as described
in the DOE-2 help menu). I just noticed that you have to use “Adjust Loads” for the zone SIZING-OPTION for this effect to be included.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">~Bill<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Hall, Brendan [<a href="mailto:BHall@karpinskieng.com">mailto:BHall@karpinskieng.com</a>]
<br>
<b>Sent:</b> Wednesday, November 06, 2013 2:34 PM<br>
<b>To:</b> Bishop, Bill; <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> RE: NEW (?) eQUEST DOAS workaround using plenum spaces<o:p></o:p></span></p>
</div>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">I’d say that is a pretty clever approach. Would you just add the geometry as a normal plenum zone with exterior/interior walls and such or would you just have them exist as plenum zones with only one heat transfer
surface in common with each the zone(s) its serving? Wouldn’t you want DESIGN-COOL-T AND DESIGN-HEAT-T to be the same as the zone it is serving? Then you could set the u value of the air wall high so that any cooling or heat that the DOAS provides would then
be effectively transferred into the occupied spaces. I think in that scenario it might act as a quasi supply plenum? Not sure without actually trying it. Just my first thoughts, maybe you have already considered all that and the way you described works better.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black">Brendan Hall, PE, LEED AP </span>
<span style="font-size:8.0pt;color:black">BD+C</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">Engineer, Mechanical<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="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"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
<a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a> [<a href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>Bishop, Bill<br>
<b>Sent:</b> Wednesday, November 06, 2013 1:17 PM<br>
<b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] NEW (?) eQUEST DOAS workaround using plenum spaces<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I doubt I’m the first to think of this but I don’t recall it being discussed on the List. Simply put, you can model a DOAS system by assigning it to the plenum spaces above occupied spaces, and putting all OA loads in the plenum zones.<o:p></o:p></p>
<p class="MsoNormal">I propose the following workaround for modeling dedicated outdoor air systems (DOAS) in eQUEST/DOE-2.2:<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Model all shells/floors with plenum spaces if they are served by a DOAS<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Change the plenum zones ZONE: TYPE to “Conditioned”<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Leave the plenum zone COOL-TEMP-SCH and HEAT-TEMP-SCH as “undefined” (no zone control over the DOAS operation)<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Pick DESIGN-COOL-T and DESIGN-HEAT-T values for the plenum zones that match the likely DOAS supply air temperature range<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Create the DOAS as a new SYSTEM (TYPE = [whatever is appropriate])<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Assign the DOAS to the plenum zones above the conditioned zones that it actually serves<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Assign outdoor air only to the plenum zones, representing the outdoor air requirement of the conditioned zones below<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Create/modify internal walls between plenum zones and zones below, making them “Air walls”<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">This method has the following advantages:<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>No exceptional calcs or separate models needed (but see “Conditioned area” comment below)<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>All DOAS systems can be modeled as designed, within normal eQUEST constraints<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>A single DOAS system can supply ventilation air to multiple zones/systems<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>DOAS system operation and ventilation supply can be independent of the other systems serving the zones<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Return air temperature to the DOAS closely follows that of the occupied zone, for accurate heat recovery simulation<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Zonal systems “see” the space load from ventilation air that is not supplied at a “zone-neutral” temperature<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>DCV can be modeled, but people need to be assigned to the plenum spaces
<u>instead</u> of the occupied spaces below (which might also be a disadvantage of this method)<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>No ventilation load changes need to be made to create the LEED Baseline from the Proposed design model, but the plenum zones need to be assigned to the baseline systems that serve the zones below.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">…but has these disadvantages or does not solve these problems:<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Conditioned floor area reported (such as in LS-C) is incorrect. Subtract the area served by the DOAS (as reported on SV-A).<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Latent heat transfer is not simulated across interior walls. Ideally, latent loads should be assigned to the plenum spaces to represent the portion of non-ventilation latent loads handled by the DOAS.<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Plenum space FLOOR-WEIGHT may need to be adjusted for realistic lag time and peak load damping (I haven’t thought this out yet)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Please discuss!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">~Bill<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Franklin Gothic Medium","sans-serif";color:black">William Bishop, PE, BEMP, BEAP, LEED AP
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