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Re: [EnergyPlus_Support] ** Severe ** Too many iterations (SOLVZP) in Airflow Network simulation
Try decrease the simulation timestep.
2014-05-05 13:41 GMT+02:00 <<mailto:m.aldegheri@xxxxxxxxx>m.aldegheri@xxxxxxxxx>:
> Â
Hi all,
> I have a problem with the processing of a idf.
> The model have an AFN and it's a nat vent building.
>
> E+ gives me this fatal error...
>
>  ** Severe ** Too many iterations (SOLVZP) in Airflow Network simulation
> Â Â ** Warning ** AirflowNetwork: SOLVER, Changing values for initialization flag, Relative airflow convergence, Absolute airflow convergence, Convergence acceleration limit or Maximum Iteration Number may solve the problem.
> Â Â **Â Â ~~~Â Â **Â During Warmup & Sizing, Environment=SUMMER DESIGN DAY IN PALAZZINE ITEA GARDOLO, at Simulation time=07/15 10:30 - 11:00
> Â Â **Â Â ~~~Â Â ** ..Iterations=30000, Max allowed=30000
>   ** Fatal ** AirflowNetwork: SOLVER, The previous error causes termination.
>
> At the moment in the idf is set:
>
> !-Â Â ===========Â ALL OBJECTS IN CLASS: AIRFLOWNETWORK:SIMULATIONCONTROL ===========
>
> AirflowNetwork:SimulationControl,
>    VENT,                   !- Name
>    MultizoneWithoutDistribution, !- AirflowNetwork Control
>    Input,                  !- Wind Pressure Coefficient Type
>    Cp Data,                !- AirflowNetwork Wind Pressure Coefficient Array Name
>    OpeningHeight,          !- Height Selection for Local Wind Pressure Calculation
>    LowRise,                !- Building Type
>    30000,                  !- Maximum Number of Iterations {dimensionless}
>    ZeroNodePressures,      !- Initialization Type
>    0.0001,                 !- Relative Airflow Convergence Tolerance {dimensionless}
>    0.000001,               !- Absolute Airflow Convergence Tolerance {kg/s}
>    -0.5,                   !- Convergence Acceleration Limit {dimensionless}
>    ,                       !- Azimuth Angle of Long Axis of Building {deg}
> Â Â Â ;Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â !- Ratio of Building Width Along Short Axis to Width Along Long Axis
>
> I tried to change the convergence parameters from
>
>    0.0001,                 !- Relative Airflow Convergence Tolerance {dimensionless}
>    0.000001,               !- Absolute Airflow Convergence Tolerance {kg/s}
>    -0.5,                   !- Convergence Acceleration Limit {dimensionless}
>
> to
>
>    0.01,                 !- Relative Airflow Convergence Tolerance {dimensionless}
>    0.0001,               !- Absolute Airflow Convergence Tolerance {kg/s}
>    -0.5,                   !- Convergence Acceleration Limit {dimensionless}
>
> but I can't solve the problem.
> I'm not very familiar with these parameters, especially with the last one about which the manuals do not give many informations.
>
>
>
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