[Equest-users] ASHRAE G3.1.2.9 Supply Fan Power

Rimes, Christie Christie.Rimes at wspfk.com
Mon Apr 18 13:12:55 PDT 2011


The formula for G3.1.2.9 inlcudes the fan power for both the supply and return fans.

The baseline model should usually be modeled as per the design i.e. if there are return fans then model them. However if for some reason you would like to calculate the supply and return power together and enter it as a supply fan you can do so also. You shouldn’t ignore the return. 

 

Christie Rimes, LEED BD+C

Designer

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From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Jeff Ross-Bain
Sent: Monday, April 18, 2011 12:47 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] ASHRAE G3.1.2.9 Supply Fan Power

 

Hi All,

 

If an HVAC system comprises both a supply and return fan, and the formula for G3.1.2.9 is used, does the result, Pfan, represent ALL of the fan power for that system including supply and return? If so, should the baseline model only depict the supply fan values (CFM, kW/CFM, etc.) and ignore the return? 

 

Many thanks,

 

Jeffrey G Ross-Bain, PE, LEED AP, BEMP

404-228-2893 office 

404-408-2577 mobile
www.rbgb.com

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