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Dear colleagues,
we want to validate our building model implemented with Type 56 with experimental data.
As first step I tested only the Type 109 to read the weather data. The model runs and is able to read correctly the four days of measurement with time step of 15 minutes.
As second step I included also the Type 56. The model seems to run until time 14h and then it freezes with constant Temperatures until the end of the simulation time. The log file tells me that there is a problem with outside temperature iteration of a surface in the building. Do you understand which could be the issue?
I want also to add that I used this building model for months with yearly standard weather data from Meteonorm without any problems.
Any help is appreciated. Thanks in advance.
I would look carefully at the weather conditions at the time in question. It might be that there is something incoherent that is causing there to be significant oscillations in the ambient temperature. You might also try reading the data using Type9 and processing the solar with Type16. It is a bit more work than Type109 but Type109 has some fancy interpolation schemes in it that I have found to cause oscillation problems such as the one you are encountering.
@davidbradley Dear David, thanks for your fast answer. I also thought that the problem could be the weather data (I attached the weather data below) at the time in question. For that reason I already did some test changing the start time of the simulation. The model freezes always (at t = 8h - 14h) indipendent of start time. It seems that the problem is data independent. If you think that the problem could be the Type 109, I see two possible solutions:
1) Type 9 + Type 16 (suggested by you)
2) Type 99
Which do you think would be the easiest way? I never had experience with these three Types.
Thanks and have a nice day.
<userdefined>
<longitude> -17.790000 ! east of greenwich: negative
<latitude> 49.300 ! Kasava
<gmt> 1 ! time shift from GMT, east: positive (hours) - if solar time-> write "solar"
<interval> 0.25 ! Data file time interval between consecutive lines
<firsttime> 0.25 ! Time corresponding to first data line (hours)
<var> IBEAM_H <col> 0 <interp> 0 <add> 0 <mult> 1 <samp> -1 !...to get radiation in W/m�
<var> IBEAM_N <col> 0 <interp> 0 <add> 0 <mult> 1 <samp> 0 !...to get radiation in W/m�
<var> IDIFF_H <col> 0 <interp> 0 <add> 0 <mult> 1 <samp> -1 !...to get radiation in W/m�
<var> IGLOB_H <col> 3 <interp> 0 <add> 0 <mult> 1 <samp> 0 !...to get radiation in W/m�
<var> TAMB <col> 1 <interp> 2 <add> 0 <mult> 1 <samp> 0 !...to get �C
<var> RHUM <col> 2 <interp> 1 <add> 0 <mult> 100 <samp> 0 !...to get relative humidity in %
<var> WSPEED <col> 0 <interp> 1 <add> 0 <mult> 1 <samp> 0 !...to get wind speed in m/s
<var> WDIR <col> 0 <interp> 1 <add> 0 <mult> 1 <samp> 0 !...to get wind direction in degree
<var> udef1 <col> 0 <interp> 0 <add> 0 <mult> 1 <samp> 0 !...to get ... in ...
<var> pamb <col> 4 <interp> 1 <add> 0 <mult> 100 <samp> 0 !...to get pressure in Pa
<var> udef3 <col> 0 <interp> 1 <add> 0 <mult> 1 <samp> 0 !...to get ... in ...
<var> udef4 <col> 0 <interp> 0 <add> 0 <mult> 1 <samp> 0 !...to get ... in ...
<data>
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DavidBradley 10/09/2024 2:40 pm
@tonical Type99 is definitely preferred over Type109 and should be a more or less direct exchange. They both read the same file format. I tend to use the Type9/16 combination and will see if I can set up your weather file to be read and processed by that combination. Which version of Trnsys are you using?
~david
