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<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><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><b><span style='font-size:12.0pt;font-family:"Arial Narrow","sans-serif";
color:#1F497D'>Mike Kaufman, Building Performance Engineer</span></b><b><span
style='font-size:12.0pt;font-family:"Arial Narrow","sans-serif";color:#1F497D'><o:p></o:p></span></b></p>
<p class=MsoNormal style='mso-element:frame;mso-element-frame-width:524.3pt;
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paragraph;mso-element-anchor-horizontal:column;mso-height-rule:exactly'><b><span
style='font-size:12.0pt;font-family:"Arial Narrow","sans-serif";color:#EEB500'>130
W. 5th Avenue, Denver, CO 80204 <o:p></o:p></span></b></p>
<p class=MsoNormal style='mso-element:frame;mso-element-frame-width:524.3pt;
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paragraph;mso-element-anchor-horizontal:column;mso-height-rule:exactly'><b><span
style='font-size:12.0pt;font-family:"Arial Narrow","sans-serif";color:#EEB500'>(NOTE
NEW ADDRESS)<o:p></o:p></span></b></p>
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paragraph;mso-element-anchor-horizontal:column;mso-height-rule:exactly'><b><span
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