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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple style='text-justify-trim:punctuation'><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'>Why does the PTAC not have any outdoor air? Each PTAC should have outside air – usually you want that rate to either be the ASHRAE 62.1 requirements, or match the proposed (there has been a lot of contention about which, so I’d play it safe and use the ASHRAE 62.1 values). You don’t want to add DOAS to the baseline PTACs, as that is not how Appendix G tells you to create the baseline system. Just assign OA to each PTAC.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal align=left style='text-align:left'><b><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:teal'>GHT Limited<br></span></b><b><span style='font-size:11.0pt;font-family:"Arial","sans-serif"'><ns0:PersonName><span style='color:black'>James Hansen</span></ns0:PersonName></span></b><b><span style='font-size:11.0pt;color:black'>, PE, LEED AP<o:p></o:p></span></b></p><p class=MsoNormal align=left style='text-align:left'><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Senior Associate</span></b><b><span style='font-size:11.0pt;color:black'><o:p></o:p></span></b></p><p class=MsoNormal align=left style='text-align:left'><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'><ns0:Street><ns0:address><span style='color:black'>1010 N. Glebe Rd, Suite 200</span></ns0:address></ns0:Street></span><span style='font-size:11.0pt;color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal align=left style='text-align:left'><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'><ns0:place><ns0:City><span style='color:black'>Arlington</span></ns0:City><span style='color:black'>, </span><ns0:State><span style='color:black'>VA</span></ns0:State><span style='color:black'> </span><ns0:PostalCode><span style='color:black'>22201-4749</span></ns0:PostalCode></ns0:place></span><span style='font-size:11.0pt;color:black'><o:p></o:p></span></p><p class=MsoNormal align=left style='text-align:left'><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:black'>703-338-5754 (Cell)</span><span style='font-size:11.0pt;color:black'><o:p></o:p></span></p><p class=MsoNormal align=left style='text-align:left'><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:black'>703-243-1200 (Office)</span><span style='font-size:11.0pt;color:black'><o:p></o:p></span></p><p class=MsoNormal align=left style='text-align:left'><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:black'>703-276-1376 (Fax)</span><span style='font-size:11.0pt;color:black'><o:p></o:p></span></p><p class=MsoNormal align=left style='text-align:left'><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:teal'><a href="http://www.ghtltd.com/"><span style='font-size:10.0pt'>www.ghtltd.com</span></a><o:p></o:p></span></p><p class=MsoNormal align=left style='text-align:left'><b><span style='font-size:11.0pt;color:#31849B'><o:p> </o:p></span></b></p></div><p class=MsoNormal><span style='font-size:11.0pt;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 align=left style='text-align:left'><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"'> bldg-sim-bounces@lists.onebuilding.org [mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>zhiren zhou<br><b>Sent:</b> Friday, December 10, 2010 10:41 AM<br><b>To:</b> bldg-sim@lists.onebuilding.org<br><b>Subject:</b> [Bldg-sim] PTAC should add DOAS?<o:p></o:p></span></p></div></div><p class=MsoNormal align=left style='text-align:left'><o:p> </o:p></p><p class=MsoNormal><span style='font-size:12.0pt'>Dear all</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:12.0pt'> I am doing LEED-CS energy rating simulation. Part of the project is residential type and the HVAC system for baseline is PTAC and the proposed system is FCU+DOAs. However the PTAC system has no outdoor air and the energy consumption of PTAC without DOAs in baseline is less than the proposed building. So I think the PTAC system should add DOAs. </span><o:p></o:p></p><p class=MsoNormal style='text-indent:21.0pt'><span style='font-size:12.0pt'>Has anyone performed the PTAC system simulation and agree with my opinion?</span><o:p></o:p></p><p class=MsoNormal style='text-indent:21.0pt'><span style='font-size:12.0pt'>Look forward to reply! Thank you very much!</span><o:p></o:p></p><p class=MsoNormal style='text-indent:21.0pt'><span style='font-size:12.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='text-indent:21.0pt'><span style='font-size:12.0pt'>Zhiren Zhou</span><o:p></o:p></p><p class=MsoNormal style='text-indent:21.0pt'><span style='font-size:12.0pt'>CABR-SH</span><o:p></o:p></p><p class=MsoNormal style='text-indent:21.0pt'><span style='font-size:12.0pt'> </span><o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p></div></body></html>