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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>I’m working on a LEED project with the following conditions:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>1)<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>The proposed system is a 4 pipe Fan Coil system. Outside air is brought into the space through an central ERV and independently ducted to each Zone. <o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>2)<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Appendix G requires the Baseline case to be Packaged VAV for each floor, with terminal re-heat for each zone<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>In my simulation, I have the outside air being calculated based on the “critical” zone for the baseline case. In order to meet the needs of the critical zone, outside air for each floor is increased to meet the critical zone needs. Outside air for the proposed system is simply the sum of all the zones, because each zone is supplied individually.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The net result is that the OA in the baseline and proposed simulation are different, because the PVAV system has to adjust the OA upward for the critical zone.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The reviewer has commented that the outside air must be the same for both simulations.<o:p></o:p></p><p class=MsoNormal>This seems like a paradox to me. It is physically impossible to make 15% OA go to one zone and 20% OA go to another zone in a PVAV system, where the OA is mixed in the AHU prior to distribution through a common duct. Forcing my simulation to do this in order to meet the reviewers comments seems to violate the spirit of LEED. Why would we purposefully compare a proposed system to baseline which cannot be built? <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Likewise, artificially raising the OA used in the proposed system simulation, to match that of the baseline system makes no since. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Has anyone else run into this before? Do you have suggestions?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>All help greatly appreciated!<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Regards,<o:p></o:p></p><p class=MsoNormal><span style='font-family:"Cambria","serif"'>Chris D. Mullinax, P.E., <span style='color:#00B050'>LEED AP, </span>CEM<span style='color:#00B050'><o:p></o:p></span></span></p><p class=MsoNormal><span style='font-family:"Cambria","serif";color:#00B050'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Cambria","serif"'>Mullinax Solutions, Inc.<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Cambria","serif"'>pn: 770-387-1334<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Cambria","serif"'>fx: 770-387-1383<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Cambria","serif"'><a href="www.mullinaxsolutions.com">www.mullinaxsolutions.com</a><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Cambria","serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:18.0pt;font-family:Webdings;color:green'>P</span><span style='color:navy'> </span><span style='font-size:7.0pt;font-family:"Arial","sans-serif";color:green'>Please consider the environment before printing this e-mail</span><span style='font-family:"Cambria","serif"'><o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoListParagraph><o:p> </o:p></p><p class=MsoListParagraph><o:p> </o:p></p></div></body></html>