[Bldg-sim] SEER and Fan Energy

[Santiago Velez]

Robert, I don´t know if I understood your question; If I did this is my
opinion: In some cases Indoor fans are included in SEER (E.g. Rooftop).
Since you are modelling fans and Refrigeration cycle efficiency separately,
you need to subtract this energy from the SEER calculation. On the other
hand, additional fan power is related to the baseline for 90.1, and its
additional fan power your Baseline will use so that certain beneficial
aspects of the proposed design or equipment (eg. Merv 13 filter) are not
excluded from the project because of energy increase.

In *Energypro* you model the rooftop and you have inputs for Cooling
> capacity, cooling power and a separate input for fan power and volume
> Since baseline es calculated automatically aditional fan power has a
> specific input in on....
>
> *Energyplus *on the other hand,  there are different objects and each has
> different inputs. For example *Coil:Cooling:DX:TwoSpeed* the *Rated High
> Speed COP* input  includes electric power for the compressor(s) and
> condenser fan(s) but does not include the power consumption of the supply
> air fan. Additional fan power has to be calculated manually and added as an
> increase in pressure drop in the corresponding fans.
>
>
> I hope this was of any help.
>
> Best regards,
>
> Santiago.
>
>
> 2013/1/30 RobertWichert <robert at wichert.org>:
>
> > 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
> >
> >
> >
> >
> >
> >
> >
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