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





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@xxxxxxxxx> 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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