Re: [EnergyPlus_Support] Re: VRF warnings, Iteration limit exceeded calculating terminal unit part-load ratio

[jeannieboef <jeannieboef@xxxxxxxxx>]

on second thought, forget about my buffertank idea, and see if you can't limit the equipment minimum part load on. like a chiller which is either on at 25% minimum or off. compressor equipment don't like low Part Load operation. In your case think also of setting a min. damper position for the terminal outlet, or a min. fan flow rate greater than zero. I don't know your idf.

jean.

Sent from my iPhone

On 06.12.2012, at 05:30, "JFCS" <jamo0312see@xxxxxxxxx> wrote:

 

a buffer tank?? i am not familiar of this on energyplus? how can i include this in a model.. does you have the reference in energyplus on how to incorporate this?

Thank you for the reply.

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, jeannieboef <jeannieboef@...> wrote:
>
> the equipment usually turns off at low load conditions. they don't
> like ramping down that low. suggest using a buffer tank to take on
> these conditions and switching the vrf unit off at low load conditions
> and/or have it supply the buffer tank at normal capacities.
>
> Sent from my iPhone
>
> On 05.12.2012, at 03:58, "JFCS" <jamo0312see@...> wrote:
>
> > I am concern about my VRF model, Specifically my cooling coil VRF
> > DX...
> > its showing A LOT of warnings regarding Iteration limit and Part-
> > load ratio as shown below...
> >
> > ** Warning ** ZoneHVAC:TerminalUnit:VariableRefrigerantFlow "FCU 1A-1"
> > ** ~~~ ** Iteration limit exceeded calculating terminal unit part-
> > load ratio, maximum iterations = 500
> > ** ~~~ ** Part-load ratio returned = 5.270E-004 Environment=ORTIGAS
> > AVE. GREENHILLS SAN JUAN CITY, at Simulation time=07/15 09:00 - 09:15
> > ** ~~~ ** Load requested = 1.10844E-012, Load delivered = 12.32182
> >
> > How can i solve this warning??
> >
> >
>

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