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    <font size="+1">The possibility I was considering as well but a
      couple of minor adjustments.  Set tracking to No, Control to
      cycling, to allow on/off, The key is the source, you want the
      exhaust to operate independent of the air handler. Infiltration or
      balanced infiltration will do this.  Set up an annual schedule,
      type on/off, hourly week schedule and hourly report day schedule. 
      In the hourly report day schedule put a 1 in for the hours a truck
      will be in the building and you are running the exhaust.  Define
      the exhaust annual schedule in the air side HVAC tab under fans. 
      Down at the bottom you will see exhaust.<br>
      I tested this on a model I had and you can see the jump in the
      heating and cooling for the hour(s) you have the exhaust on in the
      SS-J report.  I didn't do any other checking though on the fan
      power energy and where it went.<br>
      Bruce Easterbrook<br>
      Abode Engineering<br>
    </font><br>
    On 28/09/2011 08:55 AM, Eric O'Neill wrote:
    <blockquote
cite="mid:B05ECD87EE29834B92835EBF46AD85970249FAE1@PINKFLOYD.michaelsengineering.local"
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      <div class="WordSection1">
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#563B09">Jacob,<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#563B09"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#563B09">I’ve
            got a fourth possibility to consider. I think you can
            accomplish something similar to what you need in “Air-Side
            HVAC Zone Parameters” for the zone(s) you’re working on. In
            the outdoor air tab, specify an exhaust tracking control
            method and the exhaust schedule to match when the trucks are
            in the building. Everything else you’ve described can be
            filled in there. It doesn’t sound like an exact match - I
            believe this will increase the OA through the main RTUs
            (shouldn’t change the fan volumes, and just models the
            conditioning in the main unit rather than the makeup unit),
            rather than through separate units.  Check your hourly
            reports, but it might be close enough.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#563B09"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#563B09"><img
              id="Picture_x0020_5"
              src="cid:part1.07050303.00040205@bellnet.ca" height="500"
              width="741"></span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#563B09"><o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#563B09"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#563B09"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#563B09">Good
            luck!<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#563B09"><o:p> </o:p></span></p>
        <div>
          <p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#563B09">Eric
                O'Neill <br>
              </span></b><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#563B09">608.785.3328
              | </span><b><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#018942">MICHAELS
                ENERGY</span></b><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#563B09"><o:p></o:p></span></p>
        </div>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#563B09"><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" style="margin-left:.5in"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">
                <a class="moz-txt-link-abbreviated" href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>
                [<a class="moz-txt-link-freetext" href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>] <b>On
                  Behalf Of </b>Nick Caton<br>
                <b>Sent:</b> Tuesday, September 27, 2011 5:25 PM<br>
                <b>To:</b> jacob goodman;
                <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] Two separate outside
                air streams for a zone<o:p></o:p></span></p>
          </div>
        </div>
        <p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
        <p class="MsoNormal" style="margin-left:.5in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi
            Jacob,<o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:.5in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal" style="margin-left:.5in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">My
            intuition would be something like your 2<sup>nd</sup>
            suggestion…  Split the space geometrically in 2 to get two
            spaces/zones.  Set the thermal connection between them as an
            air wall.<o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:.5in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal" style="margin-left:.5in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Define
            your RTU for one zone.  Define your OA vent fans for the
            other.  Separate scheduling for concurrent/non-concurrent
            runtimes as appropriate.  Consider your model now has two
            thermostats for two systems, which may or may not match
            reality.  In any case – make sure both systems’ fan/tstat
            schedules are defined in relation to each other.  If you  go
            all out and also model the additional internal loads of a
            bunch of tons of blazing hot metal entering in the
            summertime, you may expect to encounter a certain “normal”
            amountNote that some unmet hours may be normal  <o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:.5in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal" style="margin-left:.5in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Your
            3<sup>rd</sup> approach seems viable on the surface though…
            is your supply fan “all or nothing” (constant volume fan
            control)?  I think you may need to swap to something like
            VSD or maybe explore the PTAC “two-speed” option to get your
            “staged” flow work, from your description.  I’d continue
            reviewing the hourly results until you can find the golden
            combination of tweaks that make it happen ;).<o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:.5in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal" style="margin-left:.5in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">~Nick<o:p></o:p></span></p>
        <div>
          <p class="MsoNormal" style="margin-left:.5in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><img
                id="Picture_x0020_1"
                src="cid:part2.06010505.04070504@bellnet.ca"
                alt="cid:489575314@22072009-0ABB" height="37"
                width="119"></span><b><span
                style="font-size:11.0pt;font-family:"Stylus
                BT","sans-serif";color:#2D4D5E"><o:p></o:p></span></b></p>
          <p class="MsoNormal" style="margin-left:.5in"><b><span
                style="font-size:11.0pt;font-family:"Stylus
                BT","sans-serif";color:#2D4D5E"><o:p> </o:p></span></b></p>
          <p class="MsoNormal" style="margin-left:.5in"><b><span
                style="font-family:"Stylus
                BT","sans-serif";color:#2D4D5E">NICK
                CATON, P.E.<o:p></o:p></span></b></p>
          <p class="MsoNormal" style="margin-left:.5in"><span
style="font-size:7.5pt;font-family:"Calibri","sans-serif";color:#CC9900">SENIOR
              ENGINEER<o:p></o:p></span></p>
          <p class="MsoNormal" style="margin-left:.5in"><span
style="font-size:7.5pt;font-family:"Calibri","sans-serif";color:#CC9900"><o:p> </o:p></span></p>
          <p class="MsoNormal" style="margin-left:.5in"><span
style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2D4D5E">Smith
              & Boucher Engineers</span><span
              style="font-size:7.5pt;color:#CC9900"><o:p></o:p></span></p>
          <p class="MsoNormal" style="margin-left:.5in"><span
style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2D4D5E">25501
              west valley parkway, suite 200<o:p></o:p></span></p>
          <p class="MsoNormal" style="margin-left:.5in"><span
style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2D4D5E">olathe,
              ks 66061<o:p></o:p></span></p>
          <p class="MsoNormal" style="margin-left:.5in"><span
style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2D4D5E">direct
              913.344.0036<o:p></o:p></span></p>
          <p class="MsoNormal" style="margin-left:.5in"><span
style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2D4D5E">fax
              913.345.0617<o:p></o:p></span></p>
          <p class="MsoNormal" style="margin-left:.5in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><a
                moz-do-not-send="true" 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;font-family:"Calibri","sans-serif";color:blue">
              </span></u><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
        </div>
        <p class="MsoNormal" style="margin-left:.5in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";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" style="margin-left:.5in"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">
                <a class="moz-txt-link-abbreviated" href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>
                [<a class="moz-txt-link-freetext" href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>] <b>On
                  Behalf Of </b>jacob goodman<br>
                <b>Sent:</b> Tuesday, September 27, 2011 4:31 PM<br>
                <b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
                <b>Subject:</b> [Equest-users] Two separate outside air
                streams for a zone<o:p></o:p></span></p>
          </div>
        </div>
        <p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
        <p class="MsoNormal" style="margin-left:.5in">Dear All,<br>
          I searched the archives to answer this question and didn't see
          anything, but may have missed something. I am trying to model
          (for LEED 2009) a warehouse that trucks occasionally drive
          into. The space has the usual ventilation air prescribed for a
          warehouse by 62.1 supplied by RTU's. Additionally, there are
          fans that turn on (3.73 kW for 16,000 cfm of outside air) when
          trucks are present. I created a schedule for "trucks present"
          using fraction type at 1.2 hours per day each weekday. I'm not
          sure how to add the outside air or get the extra fans to only
          run during those hours. <br>
          <br>
          Possible solutions:<o:p></o:p></p>
        <p class="MsoNormal"
          style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.0in;text-indent:-.25in;mso-list:l0
          level1 lfo3"><!--[if !supportLists]--><span
            style="mso-list:Ignore">1.<span style="font:7.0pt
              "Times New Roman"">      </span></span><!--[endif]-->fans
          as separate "equipment load" in the zone, on the schedule and
          add outside air to the standard ventilation air as a fraction
          of 16,000 cfm. So new vent = std vent + [(1.2/40)*16,000].
          This wouldn't give the same peak load as having a full 16,000
          cfm though. <o:p></o:p></p>
        <p class="MsoNormal"
          style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.0in;text-indent:-.25in;mso-list:l0
          level1 lfo3"><!--[if !supportLists]--><span
            style="mso-list:Ignore">2.<span style="font:7.0pt
              "Times New Roman"">      </span></span><!--[endif]-->create
          dummy zone with no loads, walls, area, etc. and give that zone
          and system the 16,000 cfm and 3.73 kW on the truck schedule.
          Tried this and only got a runtime error with no explination. <o:p></o:p></p>
        <p class="MsoNormal"
          style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.0in;text-indent:-.25in;mso-list:l0
          level1 lfo3"><!--[if !supportLists]--><span
            style="mso-list:Ignore">3.<span style="font:7.0pt
              "Times New Roman"">      </span></span><!--[endif]-->change
          the max OA to std vent + 16,000cfm and change the Min OA
          schedule to reflect truck presence (run OA at 7.25% for all
          hours 1.2 truck hours per day). Also, changed supply flow to
          system supply=9,000 + 16,000. Tried this, but the supply flow
          shown in hourly output reports was always 25,000!<o:p></o:p></p>
        <p class="MsoNormal" style="margin-left:.5in">Any suggestions?<o:p></o:p></p>
        <div>
          <p class="MsoNormal" style="margin-left:.5in"><br>
            <b><span
style="font-size:11.0pt;font-family:"Arial","sans-serif"">Jacob
                Goodman </span></b><span
style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#666666">,
              LEED AP, Green Building Specialist </span><br>
            <span
style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#666666">v:509.280.7051  i:<a
                moz-do-not-send="true" href="http://www.lseng.com"><span
                  style="color:#666666">www.lseng.com</span></a></span><br>
            <b><span
style="font-size:11.0pt;font-family:"Arial","sans-serif";color:#6D928C">L&S
                <span style="letter-spacing:1.0pt"> Engineering
                  Associates, Inc. </span></span></b><br>
            <span
style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#666666">'High
              Performance Design'</span> <o:p></o:p></p>
        </div>
        <p class="MsoNormal"
style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:.5in"><o:p> </o:p></p>
        <p class="MsoNormal"
style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:.5in"><o:p> </o:p></p>
      </div>
      <br>
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      <br>
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</pre>
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