Dear Jeannie,
I’m not clear about you question…… but I’ll
mention a couple of thing s that may help.
·
A 10HP motor is rated for 10HP of output. Input
energy is greater and is equal to output / efficiency (e.g., 10hp / .92)
·
A 10HP motor does not always use the full power rating. In
fact, since engineers are always so careful J, if they estimate that the
motor will need to produce 7HP, they may choose a 10HP motor “just to be
safe”
·
On top of that, since their calculations are also conservative,
the actual power demand may be less that 7HP, perhaps 6HP. That means you
may have a 6HP load served by a 10HP motor.
·
Most electric motors do not have constant efficiency throughout
their power range. Efficiency generally drops a lot as the actual load
drops below about 50% of the rated / maximum load.
The Building Performance Team
James V. Dirkes II, P.E., LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49504
616 450 8653
From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of jeannieboef
Sent: Friday, September 03, 2010 4:08 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Fan Moter Power output?
Is there a Fan moter rated power output or fan power output
OR do I have to derive it from standard formulas...if so what is the standard
formula?
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