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Re: [EnergyPlus_Support] Fan Power Pressures and Efficiencies - Are the calculations based on Pstat or Pt
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
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Florida Solar Energy Center
University of Central Florida
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