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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal style='text-autospace:none'><span style='color:#17375E;mso-style-textfill-fill-color:#17375E;mso-style-textfill-fill-alpha:100.0%'>I would argue that residential system type (PTAC/PTHP) should be applied to the entire multifamily building. The heading of the first column in Table G3.1.1A is Building Type, not Space Type<b>. </b>The note below the table reads “Residential building types include dormitory, hotel, motel, and multifamily….”</span><span style='font-size:7.0pt;color:#17375E;mso-style-textfill-fill-color:#17375E;mso-style-textfill-fill-alpha:100.0%'>. </span><span style='color:#17375E;mso-style-textfill-fill-color:#17375E;mso-style-textfill-fill-alpha:100.0%'>If the baseline</span><span style='font-size:7.0pt;color:#17375E;mso-style-textfill-fill-color:#17375E;mso-style-textfill-fill-alpha:100.0%'> </span><span style='color:#17375E;mso-style-textfill-fill-color:#17375E;mso-style-textfill-fill-alpha:100.0%'>HVAC should be determined solely based on the conditioned floor area and number of floors of residential versus non-residential spaces, then why was the building type used as column heading and in the note below the table? A case study in 90.1 User Manual involves a building with 4 multifamily and 4 non-residential floors. The 4-storey 54,000 SF non-residential portion in the case study is modeled with System 5, and the 4 residential floors are modeled with PTACs. </span><span style='color:#1F497D'>If corridors/stairwells in multifamily buildings are modeled with non-residential baseline HVAC, then most multifamily buildings over 5 floors would have System 7 serving these areas. I agree with Nathan that it doesn’t makes much sense, especially since most of these spaces are indirectly conditioned by losses through interior walls of apartments. <o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='color:#1F497D'>Maria<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>Nathan Miller<br><b>Sent:</b> Friday, August 17, 2012 11:32 AM<br><b>To:</b> 'Ritwik Kakati'; equest-users@lists.onebuilding.org<br><b>Subject:</b> Re: [Equest-users] LEED Baseline secondary HVAC system<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='color:#1F497D'>Based on the exact wording of the Table G3.1.1A, I would say you are System 7, which is for “<u>Nonresidential and more than 5 floors</u> OR >150,000 SF. However, we all can see that it is probably a pretty ridiculous baseline system for a corridor ventilation unit.<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'>On multifamily projects I’ve worked on, I’ve used system 5 in the past (even though the floor number requirement would trigger system 7) and never been called on it. That being said, usually that was on projects with ~7 stories, so I was much closer to the threshold, so maybe the LEED reviewer just let it slide. Even System 5 is a bit peculiar for a corridor unit. At least in my climate they end up usually being packaged rooftop, constant volume units. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal style='margin-top:1.0pt'><b><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:#632423'>Nathan Miller, PE, LEED<sup> </sup>AP BD+C<o:p></o:p></span></b></p><p class=MsoNormal><i><span style='font-size:8.0pt;font-family:"Verdana","sans-serif";color:black'>Mechanical Engineer/Senior Energy Analyst<o:p></o:p></span></i></p><p class=MsoNormal><i><span style='font-size:8.0pt;font-family:"Verdana","sans-serif";color:black'><o:p> </o:p></span></i></p><p class=MsoNormal style='line-height:115%'><b><span style='font-size:8.0pt;line-height:115%;font-family:"Verdana","sans-serif";color:#632423'>D</span></b><span style='font-size:8.0pt;line-height:115%;font-family:"Verdana","sans-serif";color:#BFAB7F'> </span><span style='font-size:8.0pt;line-height:115%;font-family:"Verdana","sans-serif";color:black'>206-788-4577 |</span><span style='font-size:8.0pt;line-height:115%;font-family:"Verdana","sans-serif";color:#BFAB7F'> </span><b><span style='font-size:8.0pt;line-height:115%;font-family:"Verdana","sans-serif";color:#632423'>O</span></b><span style='font-size:8.0pt;line-height:115%;font-family:"Verdana","sans-serif";color:#A50021'> </span><span style='font-size:8.0pt;line-height:115%;font-family:"Verdana","sans-serif";color:black'>206-285-7100</span><span style='font-size:8.0pt;line-height:115%;font-family:"Verdana","sans-serif";color:#BFAB7F'><o:p></o:p></span></p><p class=MsoNormal style='line-height:115%'><span style='color:#1F497D'><a href="http://www.rushingco.com/"><b><i><span style='font-size:8.0pt;line-height:115%;font-family:"Verdana","sans-serif";color:#632423'>www.rushingco.com</span></i></b></a></span><span style='font-size:7.0pt;line-height:115%;font-family:"Verdana","sans-serif";color:#1F497D'><o:p></o:p></span></p></div><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"'> <a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a> <a href="mailto:[mailto:equest-users-bounces@lists.onebuilding.org]">[mailto:equest-users-bounces@lists.onebuilding.org]</a> <b>On Behalf Of </b>Ritwik Kakati<br><b>Sent:</b> Thursday, August 16, 2012 2:09 PM<br><b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> [Equest-users] LEED Baseline secondary HVAC system<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I am modeling a residential building under LEED 2009. With reference to ASHRAE 90.1-2007, Exception ‘a’ in section G3.1.1 which states that we should use additional system types for nonpredominant conditions if they apply to more than 20,000 SF of conditioned space – I am confused which system type I should use for my corridors and other non-residential conditioned spaces, which are about 21,000 SF total, spread across 20 floors. Do I use System 7, because my non-residential spaces are located on more than 5 floors, or use System 3 or 5 because the area is less than 25,000 SF?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Ritwik Kakati, LEED</span><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'> Green Associate</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Design Engineer</span><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Eras Medium ITC";color:#1F497D'>DAGHER ENGINEERING, </span><span style='font-size:9.0pt;font-family:"Eras Medium ITC";color:#1F497D'>PLLC</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>29 Broadway, New York, NY 10006<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>T. 212.480.2591 x140<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>F. 212.480.2654<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><a href="mailto:rkakati@dagherengineering.com">rkakati@dagherengineering.com</a><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><a href="http://www.dagherengineering.com">www.dagherengineering.com</a><o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#006600'>Save Trees, Consider the Environment. 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