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<DIV><FONT face=Arial size=2><SPAN class=865104716-07072006>I would appreciate
any clarifications that can be shared on the underlined sentences in these
two excerpts from Appendix G of ASHRAE 90.1-2004. They seem
contradictory so I must be missing the author's intent.</SPAN></FONT></DIV>
<DIV><FONT face=Arial><FONT face=TT12B7o00>
<P align=left><FONT size=2>G3.1.2.8 </FONT></FONT><FONT size=2><B><FONT
face="Times New Roman">Design Air Flow Rates. </FONT></B><U><FONT
face="Times New Roman">System design supply<SPAN class=865104716-07072006>
</SPAN></FONT><FONT face="Times New Roman">air flow rates for the <I>baseline
building design </I>shall be based<SPAN class=865104716-07072006>
</SPAN></FONT></U><FONT face="Times New Roman"><U>on a supply-air-to-room-air
temperature difference of 20°F</U>. If<SPAN class=865104716-07072006>
</SPAN></FONT><FONT face="Times New Roman">return or relief fans are specified
in the <I>proposed design</I>, the<SPAN class=865104716-07072006>
</SPAN><I>baseline building design </I>shall also be modeled with fans
serving<SPAN class=865104716-07072006> </SPAN>the same functions and sized for
the <I>baseline </I>system supply<SPAN class=865104716-07072006> </SPAN>fan air
quantity less the minimum <I>outdoor air</I>, or 90% of<SPAN
class=865104716-07072006> </SPAN></FONT></FONT><FONT face="Times New Roman"
size=2>the supply fan air quantity, whichever is larger.</FONT></P>
<P align=left><FONT face="Times New Roman"><FONT size=2>G3.1.3.12 <B>Supply Air
Temperature Reset (Systems 5<SPAN class=865104716-07072006> </SPAN>through 8).
</B>Supply air temperature shall be reset based on<SPAN
class=865104716-07072006> </SPAN>zone demand from the design temperature
difference to a<SPAN class=865104716-07072006> </SPAN>10°F temperature
difference under minimum load conditions.<SPAN class=865104716-07072006>
</SPAN><U>Design air flow rates shall be sized for the reset supply air<SPAN
class=865104716-07072006> </SPAN></U></FONT></FONT><FONT face="Times New Roman"
size=2><U>temperature, i.e., a 10°F temperature difference.</U></FONT></P>
<P align=left><SPAN class=865104716-07072006><FONT size=2>Thank
you,</FONT></SPAN></P></FONT></DIV>
<DIV><SPAN class=141333114-30122005><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-bidi-font-family: 'Times New Roman'">Paul
<SPAN class=SpellE>Riemer</SPAN><BR></SPAN><SPAN
style="FONT-FAMILY: 'BankGothic Md BT'">THE WEIDT GROUP</SPAN><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-bidi-font-family: 'Times New Roman'"><BR>952.938.1588<BR><A
title=mailto:PaulR@twgi.com
href="mailto:PaulR@twgi.com">PaulR@twgi.com</A><?xml:namespace prefix = o ns =
"urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN></DIV></SPAN>
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