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<DIV dir=ltr align=left><SPAN class=593432818-24102007><FONT face=Arial
color=#0000ff size=2>I think you mean to be referencing ASHRAE 90.1-2004
addendum ac not addendum r which includes two new methods for calculating
fan power limits. The first looks at total Motor HP which isn't very
useful for energy modeling purposes and the second looks at fan
brake-horsepower. The fan brake-horsepower equations
are "(CFM x 0.00094) + A" and "(CFM x 0.0013) + A" for
constant volume and variable volume systems respectively. CFM is the
design airflow rate and A is the brakehorse power adjustement for various
pressure drop adjustments given in Table 6.5.3.1.1B.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=593432818-24102007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=593432818-24102007><FONT face=Arial
color=#0000ff size=2><FONT face=TT3443o00 size=2>Mike</FONT></FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=593432818-24102007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=593432818-24102007>
<DIV align=left><FONT face="Arial Black" size=2>Michael Tillou, PE,
LEED</FONT></DIV>
<DIV align=left><FONT face="Arial Black" size=2>Tillou Engineering,
LLC</FONT></DIV>
<DIV align=left><FONT face="Arial Black" size=1>Williamstown, MA
01267</FONT></DIV>
<DIV align=left><FONT face="Arial Black" size=1>P:
413-458-9870</FONT> <FONT face="Arial Black" size=1>C:
413-652-1087</FONT></DIV></SPAN></DIV><FONT face=Arial color=#0000ff
size=2></FONT><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> BLDG-SIM@gard.com
[mailto:BLDG-SIM@gard.com] <B>On Behalf Of </B>Andrew Craig<BR><B>Sent:</B>
Wednesday, October 24, 2007 11:56 AM<BR><B>To:</B>
BLDG-SIM@gard.com<BR><B>Subject:</B> [BLDG-SIM] New Calculation method for
Baseline Fan Energy in Addendum R<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<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">I was wondering if anyone out there
can explain the new calculation shown for baseline fan brake horsepower in Table
G3.1.2.9 of Addendum R to ASHRAE 90.1-2004? At first glance, the equation
doesn’t make sense because you are subtracting a relatively small number
(0.0013+A) from a large number (CFMs) leaving you with a ridiculously large
baseline fan motor brake horsepower. Am I just reading this wrong or is
there a typo? Isn’t there an easier way out there to calculate baseline
fan energy (please see version 1 of Appendix G for another confusing
calculation)?<o:p></o:p></SPAN></FONT></P>
<P><B><FONT face=Arial color=#816d5b size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; COLOR: #816d5b; FONT-FAMILY: Arial">Andrew
Craig, EIT, LEED® AP</SPAN></FONT></B> <FONT face=Arial color=#1e1f48
size=2><SPAN
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face=Arial color=#816d5b size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: #816d5b; FONT-FAMILY: Arial">Mechanical
Designer</SPAN></FONT><o:p></o:p></P>
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