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