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Re: [EnergyPlus_Support] PlantFlowResolver error -- "Branch flow rates out of bounds"
Are you using a bypass branch on the demand side of the hot water loop?
If not, try adding one.
josh_miarch wrote:
>
> I'm attempting to simulate a large, multizone building, and I'm
> encountering the following warning message:
>
> ** Warning ** PlantFlowResolver: Branch flow rates out of bounds, for
> Plant Loop=PLANT, Branch=514_COMPUTER_FC_HEATING_COIL_BRANCH
> ** ~~~ ** Conditions should be: 0.000 <= 1.517E-002 <= 0.000
>
> Over the course of an annual simulation, there are enough of these
> warnings (>30 000) to result in a fatal error that crashes the simulation.
>
> The branch in question is the heating coil branch for a
> PACKAGEDTERMINAL:AIRCONDITIONER object. Both the coil and the
> PACKAGEDTERMINAL:AIRCONDITIONER are available when these warnings are
> occurring.
>
> I've noticed that this error tends to occur largely in the shoulder
> seasons, when there is a relatively large amount of heating required
> in the morning (as there are relatively low external temperatures, and
> the zone thermostat switches from the the night set-back temperature
> of 16 C to 20 C), and then cooling required later in the day (as the
> combination of higher exterior temperatures and high internal gains
> adds heat to the zone). Although the load on the heating coil is
> relatively large in the morning and the PTAC object doesn't have a
> field for specifying max HW flowrates, the flow that I am seeing to
> coil is definitely reasonable, which makes this error more perplexing...
>
> Any help would be greatly appreciated.
>
> Josh
>
>
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Richard A. Raustad
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