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<p class=MsoNormal style='margin-left:0in'><span style='color:#1F497D'>I think a
lot of us were making the mistake of applying the total calculated fan power/cfm
to both the supply and return/exhaust fans (mostly due to ambiguous wording in
90.1). Forcing the modeler to explicitly divide up the calculated fan power allows
the reviewer to more easily check that the energy was properly accounted for. <o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:0in'><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal style='margin-left:0in'><span style='color:#1F497D'>I played
around on one project and found that unsurprisingly the fan energy didn’t
change whether I put it all in supply air and none in exhaust, or divided it up
based on the relative CFMs. <o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<div>

<p class=MsoNormal style='margin-left:0in'><span style='font-size:12.0pt;
font-family:"Franklin Gothic Demi","sans-serif";color:#1F497D'>Nathan Miller</span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif";color:#1F497D'><o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:0in'><i><span style='font-size:10.0pt;
font-family:"Times New Roman","serif";color:#1F497D'>Senior Energy
Engineer/Mechanical Engineer<o:p></o:p></span></i></p>

<p class=MsoNormal style='margin-left:0in'><span style='font-size:10.0pt;
font-family:"Times New Roman","serif";color:#1F497D'>direct: 206.788.4577<o:p></o:p></span></p>

</div>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Times New Roman","serif";
color:#1F497D'>fax: 206.285.7111 </span><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 style='margin-left:0in'><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 Hess<br>
<b>Sent:</b> Thursday, July 02, 2009 10:28 AM<br>
<b>To:</b> Bldg-Sim<br>
<b>Subject:</b> Re: [Bldg-sim] Appendix G Fan Power<o:p></o:p></span></p>

</div>

</div>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<div>

<div>

<p class=MsoNormal>We got a review comment on a recent LEED project asking us
to break down the baseline HVAC power into components even though there is no
direction, or requirement, from 90.1-2004 to do so.<o:p></o:p></p>

</div>

<div>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

</div>

<div>

<p class=MsoNormal>Can someone please help me understand why this would be
necessary?&nbsp;<o:p></o:p></p>

</div>

<div>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

</div>

<div>

<p class=MsoNormal>LEED guidelines say we have to model per Appendix G, but
Appendix G doesn't say we have to do this.<o:p></o:p></p>

</div>

<div>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

</div>

<div>

<p class=MsoNormal>I do not think it is necessary to do this as the baseline
total fan energy consumption numbers would still be the same.<o:p></o:p></p>

</div>

<div>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

</div>

<div>

<p class=MsoNormal>The equation in Appendix G is meant to give a total
allowance (for each system) for supply, return, and exhaust fans. It doesn't
matter if we break the allowance down into components or not as the total fan
energy consumption remains the same. Therefore, there is no value in doing
this.<o:p></o:p></p>

</div>

<div>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

</div>

<div>

<p class=MsoNormal>If we did break the fan energy numbers into components, how
would we do that given that there is no direction from ASHRAE or LEED on how to
do this?<o:p></o:p></p>

</div>

<div>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

</div>

<div>

<p class=MsoNormal>Thoughts?<o:p></o:p></p>

</div>

<div>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

</div>

<div>

<p class=MsoNormal>Regards,<o:p></o:p></p>

</div>

<div>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<div>

<p class=MsoNormal>James A. Hess, PE, CEM<o:p></o:p></p>

</div>

<div>

<p class=MsoNormal>Energy Engineer<o:p></o:p></p>

</div>

<div>

<p class=MsoNormal>TME, Inc.<o:p></o:p></p>

</div>

</div>

<div>

<p class=MsoNormal style='margin-bottom:12.0pt'><br>
On Jul 2, 2009, at 8:41 AM, &quot;Jeremy Poling&quot; &lt;<a
href="mailto:jpoling@epsteinglobal.com">jpoling@epsteinglobal.com</a>&gt;
wrote:<o:p></o:p></p>

</div>

<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>

<div>

<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.&nbsp; The 90.1-2004
User’s Manual is also silent on the issue; however it raises another
issue.&nbsp; In the example (Example G-J on page G-28) the calculations use
total building supply CFM for an 80,000SF medical office building. &nbsp;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. &nbsp;Is this how you are applying
the formulas?&nbsp; 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.</span><o:p></o:p></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>&nbsp;</span><o:p></o:p></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><o:p></o:p></p>

<p class=MsoNormal><i><span style='font-size:8.0pt;font-family:"Arial","sans-serif";
color:navy'>Site Solutions&nbsp;| Operations&nbsp;| 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='margin-left:0in;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"'> <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>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><o:p></o:p></p>

</div>

<p class=MsoNormal>&nbsp;<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&nbsp;based on&nbsp;&nbsp;the hp assigned to&nbsp;the&nbsp;fan motors
(supply, return, exhaust)&nbsp;in the design documents. Of course this assumes
that your baseline and your&nbsp;proposed&nbsp;design have a one-to-one fan
correspondence. &nbsp;</span><o:p></o:p></p>

</div>

<div>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>Ellen</span><o:p></o:p></p>

</div>

<div>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>&nbsp;</span><o:p></o:p></p>

</div>

<div>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>&nbsp;</span><o:p></o:p></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>
<a href="mailto:efranconi@archenergy.com">efranconi@archenergy.com</a><br>
<a href="http://www.archenergy.com/">http://www.archenergy.com/</a><br>
<br>
<br>
&gt;&gt;&gt; &quot;Rosenberg, Michael I&quot; &lt;<a
href="mailto:michael.rosenberg@pnl.gov">michael.rosenberg@pnl.gov</a>&gt;
7/1/2009 4:48 PM &gt;&gt;&gt;</span><o:p></o:p></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. </span><o:p></o:p></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>&nbsp;</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"'>&nbsp;</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
&amp; 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"'><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><o:p></o:p></p>

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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"'> <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>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</span><o:p></o:p></p>

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<p class=MsoNormal>&nbsp;<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>&nbsp;<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>&nbsp;<o:p></o:p></p>

<p class=MsoNormal>Any guidance would be much appreciated. <o:p></o:p></p>

<p class=MsoNormal>&nbsp;<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
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