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<p class=MsoNormal><span style='color:#1F497D'>Sorry, I meant PTACs….(FCU is
the proposed system).<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>And Jonathan informed me that
ASHRAE corrected this is a later addendum, as well as in the 2007 version of
90.1<o:p></o:p></span></p>
<div>
<p class=MsoNormal><b><span style='color:#31849B'><o:p> </o:p></span></b></p>
</div>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<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"'> Rosenberg, Michael
I [mailto:michael.rosenberg@pnl.gov] <br>
<b>Sent:</b> Tuesday, January 12, 2010 12:01 PM<br>
<b>To:</b> James Hansen<br>
<b>Subject:</b> RE: Check on FCU fan power calculations?<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>James,</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>There
is no baseline system that uses FCUs, so the fan power calculation is not
applicable to your proposed FCU’s.</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Mike</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'> </span><o:p></o:p></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:12.0pt;font-family:"Verdana","sans-serif";color:#D47500'>__________________________</span></b><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:12.0pt;font-family:"Verdana","sans-serif"'>Michael Rosenberg</span></b><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'> <br>
</span><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Senior
Commercial Buildings Energy Analyst</span><span style='font-size:12.0pt;
font-family:"Times New Roman","serif"'> <br>
</span><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>ENERGY
& ENVIRONMENT DIRECTORATE </span><o:p></o:p></p>
</div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Pacific
Northwest National Laboratory </span><span style='font-size:12.0pt;font-family:
"Times New Roman","serif"'><br>
</span><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>2032
Todd Street </span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><br>
</span><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Eugene,
OR 97405 </span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><br>
</span><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>(541)
844-1960 </span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><br>
</span><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>michael.rosenberg@pnl.gov
</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><br>
</span><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:#D47500'>www.pnl.gov</span><span style='font-size:12.0pt;font-family:
"Times New Roman","serif"'> </span><o:p></o:p></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<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"'>
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 8:21 AM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] Check on FCU fan power calculations?</span><o:p></o:p></p>
</div>
</div>
<p class=MsoNormal> <o:p></o:p></p>
<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>
<p class=MsoNormal><b><span style='font-family:"Arial","sans-serif";color:teal'>GHT
Limited<br>
</span></b><b><span style='font-family:"Arial","sans-serif";color:black'>James
Hansen</span><span style='color:black'>, PE, LEED AP</span></b><o:p></o:p></p>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
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