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<DIV dir=ltr align=left><SPAN class=314383016-12012010><FONT face=Arial
size=2>James,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=314383016-12012010><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=314383016-12012010><FONT face=Arial
size=2>That's an error in ASHRAE 90.1-2004 that was later corrected in the
addenda and incorporated into the 2007 version. With the correction, the fan
power allowance drops by more than 50% (from what I recall) for these small
systems.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=314383016-12012010><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=314383016-12012010><FONT face=Arial
size=2>Regards,</FONT></SPAN></DIV>
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<FONT face=Tahoma size=2><B>From:</B> bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <B>On Behalf Of </B>James
Hansen<BR><B>Sent:</B> Tuesday, January 12, 2010 10:21 AM<BR><B>To:</B>
bldg-sim@lists.onebuilding.org<BR><B>Subject:</B> [Bldg-sim] Check on FCU fan
power calculations?<BR></FONT><BR></DIV>
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<P class=MsoNormal>I was curious if anyone could confirm their experience with
App G fan power calculations for FCUs vs real life equipment
values.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>For AHUs, VAV boxes, etc, most average equipment consumes
power nearly identical to the fan power calculations of App G. Usually a
little bit better, but nothing major unless you start specifying ECM motors in
VAV boxes, fan walls for AHUs, etc.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>But for FCUs: I’ve got a project with 100+, and most of
them come out to about 0.0008 KW / cfm per the calculations.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>However, fairly standard FCU selections (from McQuay, not
that it matters), use about 0.0003 KW / cfm. That’s almost a third of the
energy use, and when the entire building is FCU, it makes a huge
difference.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Can someone confirm their experience? I’m not
complaining, but I just want to make sure there isn’t some addendum that changes
the fan power calcs for very low CFM HVAC systems.<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>
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