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<p class=MsoNormal><span style='color:#1F497D'>My understanding is option 1.
The fan energy in that formula is the sum of all the fan horse power. Search
the board, I think there is a previous email from Michael Rosenberg talking
about the fan energy. Hope this helps. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:#888888'>Ming Zeng</span></b><span style='font-size:7.5pt;font-family:
"Tahoma","sans-serif";color:#888888'>, PE, LEED<sup>®</sup> Accredited
Professional</span><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
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<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Tahoma","sans-serif";
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<p class=MsoNormal><b><span style='font-size:8.0pt;font-family:"Tahoma","sans-serif";
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color:#888888'> 612.338.8741 <b>F</b> 612.338.4840 <b>D</b> 612.341.9539 <o:p></o:p></span></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"'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Mike
Kaufman<br>
<b>Sent:</b> Tuesday, January 20, 2009 12:16 PM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] System Fan Power in Appendix G<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Hi All,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I have a specific question about using Appendix G3.1.2.9 to calculate
baseline system fan power (I have already searched previous posts and could not
find the answer I’m looking for). So, the Appendix G section reads
as follows: <u>System</u> fan electrical power for supply, return, exhaust, and
relief (excluding power to fan powered VAV boxes) shall be calculated using the
following formulas. I understand the formulas, which essentially use a
fan CFM to determine a brake horsepower BHP, which is then used to calculate
the fan power (Watts), but my question is this: Supposing you have an
HVAC system with supply, return, and small exhaust fans (in restrooms, for
example) – how do you calculate the power to each fan?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Option 1: Use your <u>supply</u> fan cfm to calculate
a power, say it comes to 10 kW, and use this as your total “system”
fan power. This 10 kW, being your whole system power, is then distributed
among all of your system fans however you desire (For example, supply fan power
= 5 kW, return fan power = 4 kW, exhaust fan power = 1 kW, for a total of 10 kW
for the fan system)<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>OR<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Option 2: Use each supply, return, and exhaust fan cfm
to separately calculate an individual kW for each fan (For example, supply fan
power = 10 kW using the supply cfm, return fan power = 9 kW using the return
cfm, exhaust fan power = 1 kW using the exhaust cfm, for a total of 20 kW for
the whole fan system)<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Obviously, you will have much more fan energy in a baseline
system calculating fan power with Option 2. Does anyone have a specific
example they can share of a fan system calculation that was accepted by USGBC
for an EAc1 energy model?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks for your help!<o:p></o:p></p>
<p class=MsoNormal>Mike<o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:12.0pt;font-family:"Arial Narrow","sans-serif";
color:#1F497D'>Mike Kaufman, Building Performance Engineer<o:p></o:p></span></b></p>
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