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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hi Jacob,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><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><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><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><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><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><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>~Nick<o:p></o:p></span></p><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><img width=119 height=37 id="Picture_x0020_1" src="cid:image001.jpg@01CC7D37.4ED35DD0" alt="cid:489575314@22072009-0ABB"></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><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><b><span style='font-family:"Stylus BT","sans-serif";color:#2D4D5E'>NICK CATON, P.E.</span></b><b><span style='font-family:"Stylus BT","sans-serif";color:#2D4D5E'><o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Calibri","sans-serif";color:#CC9900'>SENIOR ENGINEER<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Calibri","sans-serif";color:#CC9900'><o:p> </o:p></span></p><p class=MsoNormal><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><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><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><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><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><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";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;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><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><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'> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>jacob goodman<br><b>Sent:</b> Tuesday, September 27, 2011 4:31 PM<br><b>To:</b> equest-users@lists.onebuilding.org<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><o:p> </o:p></p><p class=MsoNormal>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><ol start=1 type=1><li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1'>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></li><li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1'>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></li><li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1'>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></li></ol><p class=MsoNormal>Any suggestions?<o:p></o:p></p><div><p class=MsoNormal><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 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><br><br><o:p></o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p></div></body></html>