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<div class="moz-cite-prefix">I believe I have written about this in
the past, but since this seems to be on-topic, I'll bring it up
again.<br>
<br>
The theoretical fan power equation, Fan BHP = (cfm x static press
"w.c.) / (6356 x fan efficiency) can be used to calculate the
theoretical fan BHP, but you need the fan efficiency. This seems
to be NOT the way the BHP is being calculated by the spreadsheet
that was attached previously.<br>
<br>
Is there a reason for that?<br>
<br>
Was there an assumed fan efficiency used in the spreadsheet, and
was it based on anything particular, or just a conservative
assumption?<br>
<br>
<br>
Thanks!<br>
<br>
<br>
<br>
<pre class="moz-signature" cols="72">Robert Wichert P.Eng. LEED AP BD&C
+1 916 966 9060
FAX +1 916 966 9068
===============================================
</pre>
On 3/25/2013 7:34 AM, Nick Caton wrote:<br>
</div>
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<div class="WordSection1">
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi
Vamshi,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I
advise carefully reviewing the footnotes under Table
6.5.3.1.1A, which include procedure for determining baseline
fan power adjustments.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><span
style="mso-list:Ignore">1.<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">P<sub>fan</sub>
represents the sum power of all fans in a given baseline
system (with exception to baseline systems #6/#8, fan
powered VAV boxes).<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><span
style="mso-list:Ignore">2.<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Again,
there is not a separate supply/return power calculation (see
answer #1). You can however account for adjustments present
in separate airstreams from the proposed design. <o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><span
style="mso-list:Ignore">3.<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Probably
not. Review the difference between CFM<sub>S</sub> and CFM<sub>D</sub>
carefully at the cited Table. A CFM quantity representing
the airflow each element encounters (CFM<sub>D</sub>) should
be applied against each pressure drop adjustment, not an
‘aggregate’ of supply+return. <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">You
may also find the attached resource published by 7group
helpful to cement your procedural understanding of how to
arrive at the sum total for “A.”
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">~Nick<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><img
id="Picture_x0020_1"
src="cid:part1.01030808.03070408@wichert.org"
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style="font-size:11.0pt;font-family:"Stylus
BT","sans-serif";color:#2D4D5E"><o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:"Stylus
BT","sans-serif";color:#2D4D5E"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-family:"Stylus
BT","sans-serif";color:#2D4D5E">NICK CATON,
P.E.<o:p></o:p></span></b></p>
<p class="MsoNormal"><span
style="font-size:7.5pt;font-family:"Calibri","sans-serif";color:#CC9900">SENIOR
ENGINEER<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:7.5pt;font-family:"Calibri","sans-serif";color:#CC9900"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2D4D5E">Smith
& Boucher Engineers</span><span
style="font-size:7.5pt;color:#CC9900"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2D4D5E">25501
west valley parkway, suite 200<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2D4D5E">olathe,
ks 66061<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2D4D5E">direct
913.344.0036<o:p></o:p></span></p>
<p class="MsoNormal"><span
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<p class="MsoNormal"><span
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</span></u><span
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<p class="MsoNormal"><span
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<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
<a class="moz-txt-link-abbreviated" href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>
[<a class="moz-txt-link-freetext" href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>vamshi ranga<br>
<b>Sent:</b> Monday, March 25, 2013 8:17 AM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] Baseline Fan power
calculation<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi All,<o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">I have a doubt regarding calculating fan
power as per ASHRAE 90.1-2007.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">My proposed system has, supply return
and exhaust fans separately with kW and cfm mentioned for
each fan.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">So, for calculating baseline fan power, <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">1. should I calculate it separately for
each fan type? <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">2. can I take pressure drop adjustment
both in supply and return fan power calculation?<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">3. should I sum all the cfms of supply,
return and exhaust and than apply pressure drop adjustments
to aggregated cfm.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Kindly help me out in solving the doubt.
If you have any example fan power calculations, or web links
those could guide me regarding this, plz do share them.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Thanks in advance.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Regards,<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">Vamshi.<o:p></o:p></p>
</div>
</div>
<br>
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