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Re: [EnergyPlus_Support] Pumps

Tony,

 From the SizePump subroutine:

  ! note: we assume pump impeller efficiency is 78% for autosizing
  TotalEffic = 0.78 * PumpEquip(PumpNum)%MotorEffic

Fred Buhl

tonybaxterhevacomp wrote:

>Hello anyone,
>
>I have a question on pump efficiency.  I have defined a PUMP:CONSTANT 
>SPEED with a pipe loop.  The pump pressure is 10,000 and the motor 
>efficiency is 0.9.  Everything sizes OK and I get the result:
>
>Pump power 34.4 W, shaft power 30.9 W, flow 0.2413 kg/s.
>
>The fraction shaft/pump power agrees with the motor efficiency, but I 
>cannot see where the pump efficiency is defined.  Using the 
>relationship Power = Pressure x Volume / Efficiency, it seems a pump 
>efficiency of around 0.78 is used.
>
>Can anyone help on this?
>
>Many thanks
>
>Tony Baxter
>
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>
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>
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> 
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>  
>


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