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Re: prebid...trnsfer function

Dear JiYong Yu,

for each wall the thermal properties (thermal reponse) are calculated using the
theory of transfer functions. All the transferfunctions of one *.bui have one
timebase on which the history of the transferfunctions are related to. If like
in your case the thermal history of the wall cannot be comprised in 19 steps,
than your wall might be to big. In this case you have to adjust the timebase of
your building to higher values (e.g. 2 instead of 1). This can be adjusted in
the window
project --> outputs. Please note that the timebase has to be a integer multiple
of the simulation timestep - so you might have to adjust your simstep after
increasing the timebase.


regards,

Matthias Rudolph




--------------------------------------------------------------------------------------------------------------------------------

 Matthias Rudolph
 TRANSSOLAR Energietechnik GmbH
 Curiestrasse 2
 70563 Stuttgart
 Germany

 phone: ++49-711-67976-192
 fax:     ++49-711-67976- 11

 Mailto:rudolph@transsolar.com
 http://www.transsolar.com
--------------------------------------------------------------------------------------------------------------------------------



JiYong Yu wrote:

> Hi trnsys!
> Now I simulate some building...and find some error.
>
> What is the covergence discriminant?
> How can I know the layer value is right before simulate?
>
> This is inf file..
>
>   ***** WALL TRANSFERFUNCTION CALCULATIONS *****
>
>               ---------- WALL TYPE GROUND              ----------
>
>        THERMAL CONDUCTANCE, U=     0.16667 kJ/h m2K; k-Wert=     0.04593
> W/m2K
>
>                         TRANSFERFUNCTION COEFFICIENTS
>    K            A              B              C              D
>
>    0       1.5138795E+01   -6.5369932E-13    1.5138795E+01    1.0000000E+00
>    1      -3.4507338E+02    1.5370132E-11   -3.4507338E+02   -2.2208193E+01
>    2       3.8109833E+03   -1.7531030E-10    3.8109833E+03    2.3882335E+02
>    3      -2.7170995E+04    1.2925395E-09   -2.7170995E+04   -1.6569834E+03
>    4       1.4059095E+05   -6.9256223E-09    1.4059095E+05    8.3381019E+03
>    5      -5.6272720E+05    2.8745679E-08   -5.6272720E+05   -3.2435319E+04
>    6       1.8135132E+06   -9.6197003E-08    1.8135132E+06    1.0152033E+05
>    7      -4.8362944E+06    2.6670990E-07   -4.8362944E+06   -2.6275220E+05
>    8       1.0886001E+07   -6.2464319E-07    1.0886001E+07    5.7356123E+05
>    9      -2.0991972E+07    1.2533870E-06   -2.0991972E+07   -1.0717790E+06
>   10       3.5081197E+07   -2.1769148E-06    3.5081197E+07    1.7342654E+06
>   11      -5.1273626E+07    3.2954145E-06   -5.1273626E+07   -2.4522112E+06
>   12       6.6023455E+07   -4.3641005E-06    6.6023455E+07    3.0521263E+06
>   13      -7.5349349E+07    5.0552473E-06   -7.5349349E+07   -3.3637618E+06
>   14       7.6588657E+07   -5.0933065E-06    7.6588657E+07    3.2986424E+06
>   15      -6.9615558E+07    4.3940207E-06   -6.9615558E+07   -2.8897967E+06
>   16       5.6774470E+07   -3.1208629E-06    5.6774470E+07    2.2690814E+06
>   17      -4.1658063E+07    1.6177901E-06   -4.1658063E+07   -1.6012439E+06
>   18       2.7562859E+07   -2.5605009E-07    2.7562859E+07    1.0177665E+06
>   19      -1.6474990E+07   -7.1414396E-07   -1.6474990E+07   -5.8370853E+05
>   SUM     -5.9155251E+06   -5.4069732E-07   -5.9155251E+06   -2.0382648E+05
>
>   ** ERROR - STABILITY CRITERIA FOR WALL TYPE GROUND               NOT
> FULLFILLED
>
> CHECK LAYER VALUES
>              NO FILE GENERATED **
>
> -------
>
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