Re: [TRNSYS-users] Modification in a library component and output files

[David Bradley <bradley@tess-inc.com>]

 

I am trying to modify a component that is already put (or embedded) into my project in the simulation studio. The output parameters of the component are not able to change. If somebody wants to make some changes, then it has to make changes to the library component, and put it again to the simulation studio. Is that correct?

if the parameters  inputs and outputs of the model do not change then there is no need to modify the proforma and the user is not obligated to replace the component in the Simulation Studio project. All they have to do at that point is make sure that they are using a DLL that contains the modified, recompiled, relinked source code that incorporates the change. If the list of parameters, inputs, and output changes then the user needs to update the proforma, then update all instances of that proforma in the project (either by performing an "edit: replace" or by deleting and readding the component.

I create some new “outputs” to a library component, defining the name, the role, the dimension and the unit. How can I be sure that the program really “understands” what is about? For example, the new parameters created by me are total and beam solar radiation in 4 elevations. As a result I get error messages. On the other hand, if I copy the same component from another project (that solar radiation in 4 elevations are already set), I don’t get error messages, but I cannot change some options (for example the unit of solar radiation that is an output). Have you got any idea about solving this problem?

the list of inputs, outputs, and parameters in the proforma must correspond exactly to the list of inputs, outputs, and parameters that are expected by the source code. You cannot just change the proforma without also changing the source code and recompiling the appropriate DLL. Without knowing what the error message says, it is a bit hard to guess what the problem might be.

There is an additional question about simulation. Using type 65a, gives me a result file in *.plt form. When I read the results using the software named “WordPad” I get the correct results. When I transform the same file in order to be able to read it with excel, the numbers seems to change. For example a temperature that is +2.0008191901532996E+01, is viewed through excel as 2,00E+17!!!! Is there I can do for that. Maybe using another software?

you should be able to open those files with either Wordpad or Excel. The *.plt file generated by Type65 is just a tab (or space, I am not sure) delimited text file. I would guess that if Excel is showing you some strange numbers, it is just misinterpreting the format of the data that it is reading. I use Excel (2003) all the time to open output files generated by TRNSYS. Typically, I open Excel first, then select "File: Open" browse to find the file and then follow through all of the import screens to teach Excel that both spaces and tabs are field delimiters.

Kind regards,
 David

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