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,construct ions 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)="EPIXRISM A"
> ** ~~~ ** (next)="PETROMBAMBA KAS_5CM"
> ** ~~~ ** (next)="XPS_ 5CM"
> ** ~~~ ** (next)="TOUBLO_ 9CM"
> ** ~~~ ** (inside)="ELAFROSKI RODEMA_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
>