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<p class=MsoNormal><span style='color:black'>Only you could say whether these
factors were significant in your own project.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:black'>It could be possible that if you
allocated all of the power to the supply fan, which might be variable flow with
a VFD for example, and operate at part-load conditions much of the time, the energy
consumption might be different than if an exhaust fan was included that runs
continuously at fixed load with some allocation of the power usage.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:black'>Also the program may have some
variances in heat gain to the airflows from the motor heat.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:black'>I’ll second Ellen Franconi’s
suggestion of apportioning by design document sizing when there are equivalent pieces
of equipment in both models.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:black'>David<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
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<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 9:28 AM<br>
<b>To:</b> Bldg-Sim<br>
<b>Subject:</b> Re: [Bldg-sim] Appendix G Fan Power<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<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>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>Can someone please help me understand why this would be
necessary? <o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<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>
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<p class=MsoNormal><o:p> </o:p></p>
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<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>
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<p class=MsoNormal><o:p> </o:p></p>
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<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>
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<p class=MsoNormal><o:p> </o:p></p>
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<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>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>Thoughts?<o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>Regards,<o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>James A. Hess, PE, CEM<o:p></o:p></p>
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<p class=MsoNormal>Energy Engineer<o:p></o:p></p>
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<p class=MsoNormal>TME, Inc.<span style='color:black'><o:p></o:p></span></p>
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