[Bldg-sim] Appendix G - Fan power

Andrew Craig AndrewC at InterfaceEng.Com
Tue Mar 8 10:48:39 PST 2011


This is a good question and isn't specifically addressed in Appendix G 2007.  It does specify to match the proposed design's fan arrangement so this can be used as a starting point.  On a recent job we did with return fans, the overall fan power was split 70/30 between supply and return.  Another job that used power exhaust fans split out to 80/20.  As Michael mentioned, Appendix G 2010 says that they should be proportioned out the same as the proposed design although that information often needs to be extracted from the design team.

 

Andrew Craig PE, LEED AP
Project Mechanical Engineer

INTERFACE ENGINEERING
email andrewc at interfaceeng.com <mailto:andrewc at interfaceeng.com> 
direct 503.382.2696

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From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Hopf, Johannes
Sent: Tuesday, March 08, 2011 10:36 AM
To: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Appendix G - Fan power

 

>From time to time we´re asked in LEED-Clarifications to break up the total fan-power into relief, exhaust, supply etc. Can somebody tell us what to do?

The calculation in the proposed is totally different and for the baseline we only use the 90.1 equations.

 

 

Johannes

 

Von: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] Im Auftrag von Sami, Vikram
Gesendet: Dienstag, 8. März 2011 17:11
An: bldg-sim at lists.onebuilding.org
Betreff: [Bldg-sim] Appendix G - Fan power

 

Does the dot in the equation indicate multiplication? So should the equation read CFMS X 0.0013 + A?

 

The reason I am confused is that they use X in other places. 

 

 

Thanks in advance

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