[Equest-users] Appendix G Fan Simulation

Matthew Higgins higgins at edi-arch.com
Thu Sep 17 14:12:10 PDT 2009


I've seen multiple posts regarding 2004 Appendix G Fan Power and one 
post from Ming Zeng suggested the following:
"Baseline model fan usually gives 0.00078KW/cfm.  For proposed fans, 
typically it is 0.00016-0.00018 KW/cfm/in static*"*

I have two problems related to this because my Baseline KW/cfm is closer 
to 0.001 KW/cfm for a bunch of unitary Type-3 systems, which is 
indefinitely way too high.

FIRST
Many people have referred to the calculated fan power as an allowance, 
which to me, would appear to be a threshold not to exceed based on the 
20deg-F delta for Appendix G Fan Sizing. I figure this is not the case 
because others refer to the fan power as something that is simulated in 
the model as a KW/cfm.
I've also seen posts where numbers are expressed as KW/kcfm, which would 
indicate fan power KW per thousand cfm; which again is not an applicable 
figure for simulation using eQuest.

SECOND
I'm struggling with these items because a recent GBCI reviewer has asked 
me to re-calculate my fan power because my BHPs are a bit higher than 
they should be. When I "re-calculate" these values I do not come up with 
the numbers they do (BHP ASHRAE - attached).

I'm trying to reconcile my response and eQuest inputs before we 
re-submit, but I'm not sure what to do.

Much thanks.

-- 
Matthew Higgins, LEED AP + ASHRAE-HBDP
Environmental Dynamics, Inc.
Architecture and Sustainability Consulting Services
505.242.2851 x.103

Any data provided by the Consultant, verbal or written, are to be considered opinions of building energy and/or daylight performance. The Client understands that the Consultant has no control of occupant habits, equipment or material performance or characteristics, site or climate conditions or the Contractor's method of assembly, and that the Consultant's opinions regarding building energy/daylight performance are made on the basis of the Consultant's professional judgment and experience. The Consultant makes no warranty, express or implied, that the energy/daylight performance of the building will not vary from the Consultant's opinion of building energy/daylight performance.

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