Santiago,
I am guessing, but I think that “iteration limit exceeded” warnings occur when the system heating / cooling capacity is not great enough and also when air flow is not balanced between supply and exhaust.
In your example, the load is less than zero, indicating a need for heating (-0.12331), but the system is still cooling (although at a very small rate; 3.54534E-016). Perhaps this is a cooling-only system? Or several zones are included with one system and one of them calls for heating while the others need cooling?
The Building Performance Team
James V. Dirkes II, P.E., BEMP , LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49504
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From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of iluminasol33
Sent: Friday, March 02, 2012 7:00 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] HVAC Terminal Unit: VariableRefrigerantFlow
Dear Forum,
I started to model the VRV HVAC Terminal Unit, and I have received many warnings as this one:
Warning ** ZoneHVAC:TerminalUnit:VariableRefrigerantFlow "TU2 COMEDOR"
** ~~~ ** Iteration limit exceeded calculating terminal unit part-load ratio, maximum iterations = 500
** ~~~ ** Part-load ratio returned = 6.291E-003 Environment=NESTLE CHIAPA DE CORZO, at Simulation time=01/02 06:00 - 06:10
** ~~~ ** Load req
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