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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>I think for the purposes of App G, the answer is airside. 90.1 does differentiate between air and water economizers:<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><i><span style='color:#1F497D'>economizer, air:</span></i></b><span style='color:#1F497D'> a duct and damper arrangement and automatic<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>control system that together allow a cooling system to<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>supply outdoor air to reduce or eliminate the need for mechanical<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>cooling during mild or cold weather.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><i><span style='color:#1F497D'>economizer, water:</span></i></b><span style='color:#1F497D'> a system by which the supply air of a cooling<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>system is cooled indirectly with water that is itself cooled<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>by heat or mass transfer to the environment without the use of<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>mechanical cooling.<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'>Haven’t seen a CIR that addresses this, though.<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='font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497D'>Andy Phelps, PE, LEED AP | </span><span style='font-size:10.0pt;font-family:"Arial Black","sans-serif";color:#4F6228'>BARNES & DODGE, INC</span><b><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:#4F6228'>.</span></b><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497D'> | <a href="mailto:aphelps@barnesanddodge.com">aphelps@barnesanddodge.com</a> | (o) 913-321-6444 | (c) 913-710-7915 | <o:p></o:p></span></p><p class=MsoNormal><b><i><span style='font-size:8.0pt;font-family:"Arial Narrow","sans-serif";color:gray'>The information contained in this electronic message is confidential and is or may be protected by trade secret protections, and/or other applicable protections from disclosure. 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Thank you.</span></i></b><b><i><span style='font-size:8.0pt;font-family:"Arial Narrow","sans-serif";color:gray'><o:p></o:p></span></i></b></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:#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"'> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Dahlstrom, Aaron<br><b>Sent:</b> Friday, April 15, 2011 2:35 PM<br><b>To:</b> equest-users@lists.onebuilding.org<br><b>Subject:</b> [Equest-users] app g economizer<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:12.0pt'>A simple Q – <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'>Does everyone agree that the App G baseline building is supposed to have an air-side economizer (in the mentioned climates)?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'>There are some buildings where architectural choices make it difficult to accommodate an air-side economizer.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'>Nonetheless, Section G3.1.2.6 appears to require modeling specifically an air-side economizer for the baseline<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'>I am thinking it could be a bit ambiguous depending on what you think “outdoor air economizer” means. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'>Has anyone seen interpretations clarifying this one way or the other?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'>Or submitted a CIR to allow water-side economizers in the baseline where that is the industry standard for the building type?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'>THANKS,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p><p class=MsoNormal style='line-height:150%;text-autospace:none'><b><span style='font-size:9.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:gray'>Aaron Dahlstrom , PE, LEED® AP</span></b><o:p></o:p></p><p class=MsoNormal 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