[Trace-users] Appendix G Fan Power

Bob Vogt BVogt at luckett-farley.com
Tue May 11 12:46:46 PDT 2010

I am a little confused on how to apply fan power to the baseline
building using Appendix G. Per G3.1.2.8 ".... If return or relief fans
are specified in the proposed design, the baseline building design shall
also be modeled with fans serving the same functions and sized for the
baseline system supply fan air quantity less the minimum outdoor air, or
90% of the supply fan air quantity, whichever is larger." 
Following are comments from two USGBC reviewers on different projects:

*	Please note that the Baseline fan power calculated in Section
G3.1.2.9 refers to the sum of the supply, return, exhaust, and relief
fans for each HVAC system.
*	Finally, the fan power for the Baseline Case must be calculated
according to Table G3.1.2.9 where CFM refers to the supply CFM (not
supply + exhaust + dedicated outside air), and where the fan power
refers to the sum of all supply, return, exhaust, and relief fans for
each zone.

Should the airflows be summed, calculate the fan power and then prorate
the power to each fan based on cfm?
Robert Vogt
Mechanical Group, LEED Accredited Professional
Luckett & Farley
      [smart design]
Best Places to Work in Kentucky 2009 & 2010
737 South Third Street
Louisville, Kentucky 40202
502-585-4181 x105
502-587-0488 Fax
Bvogt at luckett-farley.com
www.luckett-farley.com <http://www.luckett-farley.com/> 
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