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[EnergyPlus_Support] Re: Fan Electric Power



Dear Ana,

I get excellent agreement for fan power when using (US measurements):

BHP =    CFM x    Î"P       
                  η x    6,355
               
  f3 x    in. w.c. x    62.316 lb              x     min-HP
    min               η            ft2 x 12 in. w.c.      33,000 ft-lb
               
=    CFM x     Î"P
          η  x   6,355

It is important to know the mechanical efficiency of the fan "η" from a fan chart, or to derive it from known Brake HP.

Also, you must make sure that the E+ report reflects the correct flow. A relief fan, for example, may never operate at the rated airflow and the .eio report only shows Watts for the modeled airflow.  The .ssz will show the design airflow.
If you are using a sizing factor greater than 1.0, don't forget to use the rated airflow x sizing factor as your basis for power calculations.

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "anarui.oliveira" <anarui.oliveira@...> wrote:
>
> Hi, me again.
>
> Has anyone tried to compare the E+ estimates of Fan Electric Power with
> rated electric consumptions for these equipments?
> I've been trying to "calibrate" these values, but I keep getting E+
> plus estimates much lower than supplier data (like 2 to 10 times
> smaller values, for E+ estimate of Fan electric power).
>
> Regards,
> Ana Rui.
>
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