Very helpful, Brent. Thanks! I’ve had the same issue and was not sure what happened for the out-of-bounds periods.
The Building Performance Team
James V. Dirkes II, P.E., BEMP , LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49504
616 450 8653
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Griffith, Brent
Sent: Tuesday, November 01, 2011 5:13 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: RE: [EnergyPlus_Support] Re: Demand Ventilation Control and Enthalpy Wheel
If you want to ignore the warnings and run HeatExchanger:AirToAir:SensibleAndLatent outside of the approved range, then it is important to input the same effectiveness values at 75% and 100% flow. Those values create a linear model for effectiveness vs. flow and it can easily be the case that out-of-range flows produce nonsense effectiveness values. You need a flat, or at least very shallow, slope for that linear model and setting the effectiveness values to be the same at 75% and 100% does that.
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Jean marais
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