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Re: [EnergyPlus_Support] Heat Recovery Problem



The message is telling you that the flow rate through the HX has fallen 
to 49.4% of the nominal flow rate (see documentation for this HX). The 
is below the threshold where the simulation can accurately predict HX 
performance. Have you tried increasing the minimum OA flow rate 
(Controller:OutdoorAir)?

O. Tugrul Karaguzel wrote:
>
> Hi all,
> I'm repeatedly having the following warning for my Energy Plus model 
> in which i tried to simulate a heat recovery system (using 
> HeatExchanger:AirToAir:SensibleAndLatent).
>
> ** Warning ** HeatExchanger:AirToAir:SensibleAndLatent "OA HEAT 
> RECOVERY 3"
> ** ~~~ ** Average air volume flow rate is <50% or >130% of the nominal 
> HX supply air volume flow rate.
> ** ~~~ ** Air volume flow rate ratio = 0.494. Occurrence info= 
> HEADMASTER'S RESIDENCE, 01/01 08:00 - 08:15
>
> Does anyone have experience with such a warning? I tried to overcome 
> it by changing input parameters in objects of Controller:OutdoorAir or 
> Fan:VariableVolume or Sizing:System but unfortunately I cannot manage 
> to solve it.
> Many Thanks.
>
> Omer T. Karaguzel
> Center for Building Performance & Diagnostics
> Carnegie Mellon University
> 5000 Forbes Ave. Pittsburgh, 15213 PA
>
>
>
> 

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