[EnergyPlus_Support] Re: Fan Power Pressures and Efficiencies - Are the calculations based on Pstat or Pt

["jeannieboef" <jeannieboef@xxxxxxxxx>]

Correct, however still not clear which is used as user input and which is calculated by e+.

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Richard Raustad <RRaustad@...> wrote:
>
> Total pressure.
> 
> Ptotal = Pstatic + Pdynamic
> Ptotal = Pstatic + 1/2 * rhoV^2
> 
> 
> jeannieboef wrote:
> >
> > Are the calculations based on total pressure or static pressure rise?
> >
> > Field: Supply Fan Total Efficiency
> > Enter the total efficiency of the supply fan. This is the ratio of the 
> > power delivered to the air to
> > the electrical input power at maximum flow. This is also the product 
> > of the fan motor
> > efficiency and fan (impeller) efficiency. The motor efficiency is the 
> > power delivered to the
> > shaft divided by the electrical power input to the motor. The fan 
> > efficiency is the power
> > delivered to the air divided by the shaft power. The power delivered 
> > to the fluid is the mass
> > flow rate of the air multiplied by the pressure rise divided by the 
> > air density. Must be greater
> > than 0 and less than or equal to 1. The default is 0.7.
> >
> > Field: Supply Fan Delta Pressure
> > Enter the pressure rise in Pa at full flow and standard conditions. 
> > Standard conditions are
> > considered 20o C at sea level, 101325 Pa. The default is 1000 Pa.
> >
> > 
> 
> -- 
> Richard A. Raustad
> Senior Research Engineer
> Florida Solar Energy Center
> University of Central Florida
> 1679 Clearlake Road
> Cocoa, FL  32922-5703
> Phone:   (321) 638-1454
> Fax:     (321) 638-1439 or 1010
> Visit our web site at: http://www.fsec.ucf.edu
> 
> UCF - From Promise to Prominence: Celebrating 40 Years
>




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