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[EnergyPlus_Support] Re: Demand Ventilation Control and Enthalpy Wheel



Had exactly the same issue doing exactly the same thing for the summer case. I don't know any way to suppress warnings. Obviously, the amount of heat exchange at the enthalpy wheel reduces to very small amounts when the flow from exhaust is <50% the supply side. It seemed as if the wheel stopped working, when I watched the outputs, but I actually have no idea how the object is programmed to react in these conditions. PS in the project I was simulating, an evapourative cooler was cooling the exhaust air (but making very moist) before the heatwheel to increase (take advantage) the sensible heat transfer (which is at about 70%, while the latent eff is only 30% therefore not missing much by "humidifying" the air).

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Jason Kirkpatrick <jason.alan.kirkpatrick@...> wrote:
>
> All,
> 
> I have a model including demand controlled ventilation and an enthalpy
> wheel treating the ventilation before the AHU. This all works ok, but since
> the ventilation is varying with the occupancy, the enthalpy wheel gives an
> error that the ventilation flowrate is too far from the design flowrate:
> 
>    *************  ** Warning ** HeatExchanger:AirToAir:SensibleAndLatent
> "F1:AHU HEAT RECOVERY":  Average air volume flow rate is <50% or >130%
> warning continues. Air flow rate ratio statistics follow.
> 
> I am wondering if there is a way that anyone knows of circumventing this
> warning or at least suppressing it.
> 
> Thanks,
> 
> Jason
>




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