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<DIV>Ian,</DIV>
<DIV>LEED 2.0 referenced the old ECB method, LEED 2.2 references the PRM and depending on the building size, the baseline VAV systems jump from a DX/VAV to a "Standard" VAV with CHW from either screw or centrifugal chillers (under 2007 revisions, the choice of which is dependent on the baseline load). </DIV>
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<DIV>There is no such beast as an air-cooled chiller anywhere in the PRM baseline, unless it serves a process load same as in the proposed building.</DIV>
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<DIV>Fred<BR><BR>>>> "Doebber, Ian" <Ian_Doebber@nrel.gov> 7/21/2008 5:12 PM >>><BR></DIV>
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<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Does anyone know when an Air Cooled Chiller can be used as the baseline for a building that requires a Standard VAV System as the baseline HVAC system for LEED V2.2 New Construction.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">ASHRAE 90.1-2004 Appendix G makes it clear that a <st1:place w:st="on"><st1:PlaceName w:st="on">Cooling</st1:PlaceName> <st1:PlaceType w:st="on">Tower</st1:PlaceType></st1:place> must be used. <o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Yet an old Credit Interpretation Report (CIR) for LEED V2.0 states that an Air Cooled Chiller can be used as the baseline for any chiller under 150 tons. <o:p></o:p></SPAN></FONT></P></DIV></BODY></HTML>