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RE: [EnergyPlus_Support] Re: Sizing according to ASHRAE 90.1

E+ uses “efficiency “ in a way that is somewhat confusing:

“Motor Efficiency” = motor efficiency (e.g. .92)

“Fan Efficiency” = Fan mechanical efficiency * motor efficiency (e.g., .50 * .92 = .46)


James V Dirkes II, PE, BEMP, LEED AP
Energy Analysis, Commissioning & Training Services
1631 Acacia Drive, Grand Rapids, MI 49504 USA
616 450 8653


From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of FrancescoP
Sent: Tuesday, August 28, 2012 8:53 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: Sizing according to ASHRAE 90.1



This discussion was very useful, but now I have a new question. ASHRAE 90.1-2007 provides a method to calculate the "Fan motor Efficiency". As I'm modelling a VAV system with reheat, I'm using the object Fan:VariableVolume


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