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<div class=Section1>
<p class=MsoNormal>The equation is meant for each HVAC system. The example in
the User’s manual is probably not a very good one. If it was an 80,000 sf
single story building it would only have one baseline Packaged VAV system
and the example would be correct. If it were a multi-story building, there
would be one baseline Packaged VAV system for each floor and the example would
be incorrect. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>The User’s manual is correct that the power of the
parallel fan-powered terminal units in systems 6 and 8 is not included in the
calculation. The power of those fans is specifically called out in G3.1.3.14 at
0.35 W/cfm. <o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Mike<o:p></o:p></span></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"'> <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"'> Jeremy Poling
[mailto:jpoling@epsteinglobal.com] <br>
<b>Sent:</b> Thursday, July 02, 2009 6:41 AM<br>
<b>To:</b> Ellen Franconi; Vikram Sami; Bldg-Sim; Rosenberg, Michael I<br>
<b>Subject:</b> RE: [Bldg-sim] Appendix G Fan Power<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:navy'>This issue will start to become a problem for anyone running energy
models for LEED projects – reviewers on the new review teams are asking
to see the total fan power for the baseline broken into individual components
and reported as such in the template for Energy and Atmosphere Credit 1.
The 90.1-2004 User’s Manual is also silent on the issue; however it
raises another issue. In the example (Example G-J on page G-28) the
calculations use total building supply CFM for an 80,000SF medical office
building. Since the baseline is System 5 in that example and there would
be multiple zones for the baseline, it appears that the equation should be used
for the whole building only and not individual systems. Is this how you
are applying the formulas? The user’s manual notes that fan powered
VAV boxes are NOT included in the total fan power number as calculated from
G3.1.2.9.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><strong><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Jeremy R. Poling, LEED AP</span></strong><span style='font-size:
9.0pt;font-family:"Arial","sans-serif";color:navy'><br>
</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Senior Sustainability Analyst<br>
Strategic Services</span><span style='color:navy'><o:p></o:p></span></p>
<p class=MsoNormal><i><span style='font-size:8.0pt;font-family:"Arial","sans-serif";
color:navy'>Site Solutions | Operations | Sustainability</span></i><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><br>
<br>
</span><strong><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#C75B12'>EPSTEIN</span></strong><span style='font-size:10.0pt;font-family:
"Arial","sans-serif";color:navy'><br>
</span><span style='font-size:8.0pt;font-family:"Arial","sans-serif";
color:navy'>Architecture<br>
Interiors<br>
Engineering<br>
Construction</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'><br>
<br>
</span><strong><span style='font-size:9.0pt;font-family:"Arial","sans-serif";
color:green'>Epstein is a firm believer in sustainability. We ask that you
please consider the environment before printing this e-mail.</span></strong><o:p></o:p></p>
</div>
<div>
<div class=MsoNormal align=center style='text-align:center'><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'>
<hr size=2 width="100%" align=center>
</span></div>
<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>Ellen Franconi<br>
<b>Sent:</b> Thursday, July 02, 2009 7:37 AM<br>
<b>To:</b> Vikram Sami; Bldg-Sim; Michael I Rosenberg<br>
<b>Subject:</b> Re: [Bldg-sim] Appendix G Fan Power</span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>At
my firm, we proportion the baseline total fan power determined as an aggregated
W/CFM based on the hp assigned to the fan motors
(supply, return, exhaust) in the design documents. Of course this assumes
that your baseline and your proposed design have a one-to-one fan
correspondence. <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>Ellen<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>Ellen
Franconi, Ph.D., LEED AP<br>
Senior Energy Analyst<br>
Architectural Energy Corporation<br>
2540 Frontier Avenue<br>
Boulder, CO 80301<br>
tel. 303-444-4149<br>
fax 303-444-4303<br>
efranconi@archenergy.com<br>
<a href="http://www.archenergy.com/">http://www.archenergy.com/</a><br>
<br>
<br>
>>> "Rosenberg, Michael I" <michael.rosenberg@pnl.gov>
7/1/2009 4:48 PM >>><o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>You
have calculated the kW/cfm correctly according to the 2004 version of Appendix
G. The allowance actually goes up a little in 2007, for your case. As for the
second part of your question, no you do not apply the same kW/cfm to the
exhaust fan. The calculated allowed fan power the total allowed power for all
fans that are part of the system, including the exhaust fan. The cfm component
is based on the supply fan cfm only. Unfortunately, Appendix G gives no direction
on how to divide the allowed fan power up among the various fans in the system.
<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Mike<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></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"'> <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>Vikram Sami<br>
<b>Sent:</b> Wednesday, July 01, 2009 3:03 PM<br>
<b>To:</b> Bldg-Sim<br>
<b>Subject:</b> [Bldg-sim] Appendix G Fan Power<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>G3.1.2.9 Gives you a formula for calculating system fan
electrical power for supply, return, exhaust and relief. Lets sat I have a zone
with a PSZ-HP that has a supply volume of 1500 cfm. Using this formula along
with table G3.1.2.9 I get a fan horse power of 1.29 and kW of 1.17. This
equates to 0.00078 kW/cfm – which seems really high. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>The second part to my question is assuming I have 500cfm of
exhaust in this zone, do I apply the same kW/cfm to the exhaust fans as well as
the return fans? It seems that the lower the fan volume the more inefficient
the Appendix G values get from these tables. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Any guidance would be much appreciated. <o:p></o:p></p>
<p class=MsoNormal><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:"Garamond","serif";color:black'>Vikram
Sami,</span></b><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'>
</span><span style='font-size:12.0pt;font-family:"Garamond","serif";color:black'>LEED
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:24.0pt;font-family:Webdings;color:#007F00'>P </span><span
style='font-size:10.0pt;font-family:"Garamond","serif";color:#007F00'>Think
GREEN before you print.</span><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'><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
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