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</o:shapelayout></xml><![endif]--></head><body lang=ZH-CN link=blue vlink=purple style='text-justify-trim:punctuation'><div class=WordSection1><p class=MsoNormal><span lang=EN-US>Dear all:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> My project is a 84- floor super-high building with 27 floors for office and 47 floors for residential(hotel and apartment) and others for retail and equipment floors. When I select baseline HVAC system I’m confused as both the two option below sounds rational:<o:p></o:p></span></p><p class=MsoListParagraph style='margin-left:39.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>1)<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>The Note under TABLE G3.1.1A- Baseline HVAC System Types in Page 181 of ASHRAE 90.1 tells that : “Where attributes make a building eligible for more than one baseline system type, use the predominant condition to determine the system type for the entire building.”<o:p></o:p></span></p><p class=MsoListParagraph style='margin-left:39.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>2)<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>The explanation in Page G-23 of ASHRAE 90.1 MANUAL tells that : “If a building has both residential and nonresidential spaces with their total conditioned floor area both greater than 20,000 ft², for instance a residential tower with retail and restaurants at the base, then the HVAC system type is determined separately for the residential and nonresidential portions.”<o:p></o:p></span></p><p class=MsoNormal style='margin-left:21.0pt'><span lang=EN-US>So if I follow option 1 I should select PTAC for the whole building which I think unsuitable. else if I follow option 2 I should select PTAC for residential and VAV for office and others. <o:p></o:p></span></p><p class=MsoNormal style='margin-left:21.0pt'><span lang=EN-US>Which option should I follow?<o:p></o:p></span></p><p class=MsoNormal style='margin-left:21.0pt'><span lang=EN-US>Could anyone tell me? Thanks<o:p></o:p></span></p><p class=MsoNormal style='margin-left:21.0pt'><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal style='margin-left:21.0pt'><span lang=EN-US> Zhiren ZHOU<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div></body></html>