[Trace-users] Appendix G Fan Energy

Fareed Syed syedf at progressiveae.com
Tue Oct 27 12:17:43 PDT 2009

Hello Marty,


I would suggest you to calculate the baseline fan energy on a spreadsheet using 90.1 users manual and use this value for the energy model. I know trace internally takes the summation of cfm's and applied appendix G. Also look for the optimum start option under Systems à Options à Advanced Options àSchedules. 


Other strategy what you can adopt is make similar models and run the model for only one month (Actions àChange Load ParametersàFirst month and last month).


Hope this helps you little bit.






Fareed Syed EIT, LEED® AP

Mechanical Engineer 

1811 4 Mile Rd NE
Grand Rapids, MI  49525


Phone: 616.361.2664 ext. 3247
Direct: 616.447.3447
Fax: 616.361.1493

syedf at progressiveae.com
www.progressiveae.com <http://www.progressiveae.com/> 




From: trace-users-bounces at lists.onebuilding.org [mailto:trace-users-bounces at lists.onebuilding.org] On Behalf Of Snarski, Marty
Sent: Tuesday, October 27, 2009 2:33 PM
To: trace-users at lists.onebuilding.org
Subject: [Trace-users] Appendix G Fan Energy


Hello, all.


I'm running an energy model (for LEED), and am having a particular problem with the Fan Energy results.  I am using the actual fan horsepower (for the supply and for the return fans) for the proposed building, and the Appendix G equation in G3.1.2.9.  The results I'm getting for the proposed design are considerably higher (about 31%) than the baseline building.  This leads me to believe that I may be misinterpreting the equation.  


As stated in the 90.1 Users manual, the equation accounts for supply, return, relief, and exhaust fans.  However, I've been simply inputting the Supply CFM into the equation.  Given that it accounts for all fans, should I use the accumulated CFMs for each of those fans (i.e. if I'm supplying 32,000, and returning 24,000, should I use 56,000 cfm)?


While I understand TRACE has the automatic baseline fan sizing capability, I'm not sure I trust it completely, and would like to know where the calculation comes from.


Thanks for any help you can offer!

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