Re: [EnergyPlus_Support] airflow network - too many iterations

[Lixing Gu <gu@xxxxxxxxxxxx>]

Marzia:

When two zones are used in the AirflowNetwork model, an internal wall with a 
crack or an opening is required to make two zones connected. The surfaces 
defined in the AIRFLOWNETWORK:MULTIZONE:SURFACE objects in the input file 
are all exterior surfaces, so that there is no internal wall to connect two 
zones. Please add an internal wall for zonal connection.

Best regards,

Lixing

----- Original Message ----- 
From: "marziasedino" <marziasedino@xxxxxxxx>
To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
Sent: Monday, October 27, 2008 6:41 PM
Subject: [EnergyPlus_Support] airflow network - too many iterations


> Hi all,
>
> I am trying to simulate the natural airflow in the core of a
> rectangular building and its interaction with the buildings thermal
> zones.
> If I define openings (simple openings)only in the core my airflow
> network simulation runs properly, but if I add openings on the other
> thermal zones around the core I get the following error message
>
> "Too many iterations (SOLVZP) in AirflowNetwork simulation
>   ** 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."
>
> This happens only if I define more than one thermal zone around the
> core. In fact originally I modeled a building with only 2 thermal
> zones: the core itself and the building zone around it, both with
> single openings, and the simulation wouldn't crash.
>
> could you please help me figure out what I am mistaking?
> the file has been uploaded in the Problem Submittals folder and its
> name is "airflow in the core".
>
> thanks a lot in advance!
>
> Marzia
>
>
>
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> 


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