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<p class=MsoNormal>My opinion is that if a designer “schedules” a
fan bhp to meet a certain static pressure requirement, and then knowing that it
will actually have to meet a higher static pressure (not as a safety factor but
during normal operation) schedules a motor with a large enough nameplate hp to
accommodate that, it is an attempt to get around the requirement in 90.1.<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";color:#D47500'>__________________________</span></b><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'> <o:p></o:p></span></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><span style='font-size:12.0pt;font-family:
"Times New Roman","serif"'><o:p></o:p></span></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><span style='font-size:10.0pt;font-family:
"Arial","sans-serif"'><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"'> bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Ryan
Hammond<br>
<b>Sent:</b> Tuesday, March 23, 2010 1:31 PM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] 90.1-2007, Fan BHp and Filter Pressure Drop<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";
color:black'>All,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>A colleague brought up an interesting point about filters and fan
BHp. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Regarding 90.1-2007, Table 6.5.3.1.1A, Option 2, what is your
interpretation of “bhp = the maximum combined fan brake horsepower”
for an AHU? And how does 90.1-2007 verify this?<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>90.1-2007 defines “fan system bhp” and “fan
system design conditions”; however there isn’t any clear mention of
how exactly fan BHp is defined with respect to filters (100% loaded filter
delta-p, 66% loaded filter delta-p, 33% loaded filter delta-p, etc.). The
fan system would still meet capacity requirements, just at a reduced filter
pressure drop as scheduled.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>For example, a designer could define (and schedule) the fan BHp to
operate at a max of 66% of allowable filter pressure drop for reduced fan
energy, yet schedule a fan motor to be able to meet the fully loaded filter
pressure drop. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>The ramifications of scheduling a lower fan BHp against 90.1-2007
is the proposed system will now be operating more “efficiently”,
compared to the baseline, assuming the filters are truly replaced at 66% of
allowable filter pressure drop (which likely would never happen in the
field!). <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Any thoughts on this? Anyone on the 90.1-2007 committee that
could shed some insight?<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Thanks,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Ryan<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'><o:p> </o:p></span></p>
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mso-element-frame-hspace:2.25pt;mso-element-wrap:around;mso-element-anchor-vertical:
paragraph;mso-element-anchor-horizontal:column;mso-height-rule:exactly'><span
style='color:black'><img width=47 height=62 id="Picture_x005f_x0020_10"
src="cid:image001.jpg@01CACA9F.67F68360"
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mso-height-rule:exactly'><b><span style='font-size:14.0pt;color:navy;
letter-spacing:-.3pt'>R. Ryan Hammond </span></b><b><span
style='font-size:10.0pt;color:navy;letter-spacing:-.3pt'>PE, HBDP, BEMP, LEED
AP</span></b><span style='font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p>
<p class=MsoNormal style='line-height:11.0pt;mso-line-height-rule:exactly;
mso-element:frame;mso-element-frame-hspace:2.25pt;mso-element-wrap:around;
mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:column;
mso-height-rule:exactly'><b><span style='font-size:10.0pt;color:navy'>Engineer</span></b><span
style='font-size:12.0pt;font-family:"Times New Roman","serif";color:black'><o:p></o:p></span></p>
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mso-height-rule:exactly'><b><span style='font-size:9.0pt;color:gray'>(P)
916.921.1956 x202 </span></b><span style='font-family:"Arial","sans-serif";
color:black'><o:p></o:p></span></p>
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<p class=MsoNormal style='line-height:11.0pt;mso-line-height-rule:exactly'><b><i><span
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