[EnergyPlus_Support] Pumps

["tonybaxterhevacomp" <tony@xxxxxxxxxxxx>]

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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