[Bldg-sim] SEER and Fan Energy

[RobertWichert]

This forum has discussed fan energy before, and since that time I have 
grappled with the concept of fan power, specifically how to avoid double 
counting fan power since even indoor fans are included in SEER ratings.

I suppose that I should start by confirming that indoor supply and 
return fans are included in SEER ratings.  I have read the DOE 49 CFR 
Pt. 430, Subpt. B, App. M UNIFORM TEST METHOD FOR MEASURING THE ENERGY 
CONSUMPTION OF CENTRAL AIR CONDITIONERS AND HEAT PUMPS.  It seems clear 
in that method that indoor fans are included in the power and energy 
calculations.  If not, please let me know what I am missing.

OK, if indoor supply and return fans are included in the SEER rating, 
then why would we put additional fan energy into our calculations?  Does 
EQuest, EnergyPro, E+, and all the rest do some math to subtract this 
out, and if so, how is that done?

Sorry for the basic question, but I have thought about this a lot and 
haven't reached a comfortable solution.  At one point I thought that the 
SEER calculation did not account for indoor fans, but I now find that to 
be wrong.


Your thoughts are appreciated.



-- 
Robert Wichert P.Eng. LEED AP BD&C
+1 916 966 9060
FAX +1 916 966 9068







===============================================