Re: [EnergyPlus_Support] Fatal Error on CFT Withoun having any CFT

[Don Shirey <shirey@xxxxxxxxxxxx>]

The idf file that you sent had different layers defined for construction 
= "EXOTERIKOS_M5" compared to what is shown in the severe error message 
that you provided:

Construction,
    exoterikos_m5,           !- Name
    epixrisma,               !- Outside Layer
    toublo_9cm,              !- Layer 2
    petrombambakas_5cm,      !- Layer 3
    toublo_9cm,              !- Layer 4
    epixrisma;               !- Layer 5

Regardless, material layer "epixrisma" is 1 meter thick.... is that 
really what you want?

As the error message says:

   **   ~~~   ** The potential causes of this problem are related to the input for the construction
   **   ~~~   ** listed in the severe error above.  The CTF calculate routine is unable to come up
   **   ~~~   ** with a series of CTF terms that have a reasonable time step and this indicates an
   **   ~~~   ** error.  Check the definition of this construction and the materials that make up
   **   ~~~   ** the construction.  Very thin, highly conductive materials may cause problems.
   **   ~~~   ** This may be avoided by ignoring the presence of those materials since they probably
   **   ~~~   ** do not effect the heat transfer characteristics of the construction.  Highly
   **   ~~~   ** conductive or highly resistive layers that are alternated with high mass layers
   **   ~~~   ** may also result in problems.



kostas ordoumpozanis wrote:
> HI I am modeling a simple 3zone building with the use of openstudio and sketchup. i have create the geometry and the materials,constructions e.t.c., and when i am running the energyplus (not inside the openstudio) i got an error about CTF, without having any CFT data in my input file.
>
> "Severe  ** CTF calculation convergence problem for Construction="EXOTERIKOS_M5".
>    **   ~~~   ** ...with Materials (outside layer to inside)
>    **   ~~~   ** (outside)="EPIXRISMA"
>    **   ~~~   ** (next)="PETROMBAMBAKAS_5CM"
>    **   ~~~   ** (next)="XPS_5CM"
>    **   ~~~   ** (next)="TOUBLO_9CM"
>    **   ~~~   ** (inside)="ELAFROSKIRODEMA_30CM"
>    **   ~~~   ** Request Output:Report:Construction or Output:Construction to see more information on Constructions.
>    **   ~~~   ** The potential causes of this problem are related to the input for the construction
>    **   ~~~   ** listed in the severe error above.  The CTF calculate routine is unable to come up
>    **   ~~~   ** with a series of CTF terms that have a reasonable time step and this indicates an
>    **   ~~~   ** error.  Check the definition of this construction and the materials that make up
>    **   ~~~   ** the construction.  Very thin, highly conductive materials may cause problems.
>    **   ~~~   ** This may be avoided by ignoring the presence of those materials since they probably
>    **   ~~~   ** do not effect the heat transfer characteristics of the construction.  Highly
>    **   ~~~   ** conductive or highly resistive layers that are alternated with high mass layers
>    **   ~~~   ** may also result in problems.  After confirming that the input is correct and
>    **   ~~~   ** realistic, the user should contact the EnergyPlus support team."
>
> i upload and the idf to check it,
>
> anyone have seen this again (version 3.1)
>
> Kindly regards
>   


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