Brendan,
Flow X Delta P x K / Fan efficiency / Motor efficiency = BHP or W
In order to get an autosized fan to result in the proper power for 90.1, you probably want to derive the appropriate delta P based on your motor and fan efficiencies. (Double-checking the results against 90.1 is also good!)
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 bcmcgr
Sent: Friday, February 18, 2011 3:12 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] ASHRAE 90.1 - Fan Power
All,
It is my understanding that according to ASHRAE 90.1 Appendix G fan power must be modeled for the Proposed and Baseline models but I do not see a place to input hp into E+. I'm under the impression that the fan operates on a power curve within E+ and that the fan power cannot be directly input. Is this correct? How do you all satisfy this requirement of 90.1?
Brendan
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