<html><body bgcolor="#FFFFFF"><div>How does the calc apply for a fan coil system with 100% oa? Or is it only pertinent to vav? We had some gbc comments back asking to see the same calc for the proposed.<br><br>Sent from my iPhone</div><div><br>On 23 Mar 2010, at 22:49, "Rosenberg, Michael I" <<a href="mailto:michael.rosenberg@pnl.gov">michael.rosenberg@pnl.gov</a>> wrote:<br><br></div><div></div><blockquote type="cite"><div>
<div class="Section1">
<div>
<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""><a href="mailto:michael.rosenberg@pnl.gov">michael.rosenberg@pnl.gov</a>
</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"><a href="http://www.pnl.gov">www.pnl.gov</a></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""> <a href="mailto:bldg-sim-bounces@lists.onebuilding.org">bldg-sim-bounces@lists.onebuilding.org</a>
[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> <a href="mailto:bldg-sim@lists.onebuilding.org"><a href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a></a><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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<p class="MsoNormal" align="center" style="text-align:center;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"><span style="color:black"><image001.jpg></span><span style="font-family:
"Arial","sans-serif";color:black"><o:p></o:p></span></p>
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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: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>
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mso-element:frame;mso-element-frame-hspace:2.25pt;mso-element-wrap:around;
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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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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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