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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Maybe I’m mistaken here, but I’ve always understood the
Supply flow to be kW/cfm. So if your design condition is 9.9 BHP, what is the
design flow rate (in cfm) that goes with that?<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'>So for instance if your design flow rate is 20,000 cfm at 9.90
BHP, then your Supply KW/Flow = 12.83/20,000 = 0.000642<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
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<p class=MsoNormal style='mso-margin-top-alt:auto'><b><span style='font-family:
"Garamond","serif";color:black'>Vikram Sami,</span></b><span style='color:#1F497D'>
</span><span style='font-family:"Garamond","serif";color:black'>LEED AP</span><span
style='color:#1F497D'> <br>
</span><span style='font-family:"Garamond","serif";color:black'>Direct Phone
404-253-1466 | Direct Fax 404-253-1366</span><span style='color:#1F497D'> <o:p></o:p></span></p>
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style='font-size:10.0pt;font-family:"Garamond","serif";color:maroon'>ARGENT</span></b><b><span
style='font-family:"Garamond","serif";color:maroon'> A</span></b><b><span
style='font-size:10.0pt;font-family:"Garamond","serif";color:maroon'>RCHITECTURE</span></b><b><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"'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Lars
Fetzek<br>
<b>Sent:</b> Wednesday, September 16, 2009 4:48 PM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] SUPPLY-KW/FLOW<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>eQuesters
& DOE2-2ers,</span><o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>
The DOE2-2 dictionary loves to use the phrase, "total fan power per unit
flow" in defining SUPPLY-KW/FLOW. Clear as mud.</span><o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>
I figured this: At design conditions, the supply fan runs at 9.90 BHP and
61.89% efficiency and the per-unit flow is at unity ( x CFM / x CFM = 1).
The motor nominal efficiency is 93%. (No, I don't have a motor efficiency
curve.) 0.746 kW = 1 HP. Therefore, the fan kW =
9.90 * 0.746 / ( 0.6189 * 0.93 ) = 12.83 kW. The per unit
flow is 1. So... SUPPLY-KW/FLOW = 12.83, which I type into my .inp
file.</span><o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>
Naturally, eQuest gives me an error message, insisting that SUPPLY-KW/FLOW must
be between 0.0 and .0080. Evidently, there is some discrepancy involving
units or the meaning of "per unit" in the context of the quoted
phrase.</span><o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>
Can anyone clarify what eQuest really means and how to calculate
SUPPLY-KW/FLOW? Is it supposed to be KW-per-CFM?</span><o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>
Thanks!</span><o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Lars
Fetzek, EI</span><o:p></o:p></p>
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<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Phoenix
Engineering Group</span><o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Tampa,
Florida</span><o:p></o:p></p>
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