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Re: [TRNSYS-users] Unknown unit number + negative flow rate errors



Hi, 

Thanks Ciarán for your help. However, the .lst file doesn't say much more about the errors. 

1/ The unit number (24) is not written on the input file. Plus, the associated type changes (and is not in the current simulation in most cases) each time I get this error. Let's forget about this then. 

2/ The second error ("a negative flow rate was encountered") has retained my attention (first of all because it stops the simulation) and I would be glad if I could draw your attention on this issue. Please find attached the TRNSYS model and refer to it for unit and type numbers. As you can see I have traced the critical components to better understand the error. Here is what happens : 

- During post-convergence call, mass balance is not achieved through the first tee piece (Type 11, Unit 55). Input flow rates are 339,8 kg/hr and 0 kg/hr whereas output flow rate is 339,6 kg/hr (equal to iteration 0 and 1 of the current time step and to the converged value of the previous time step). Right after this, in the lst file, a fatal error is detected (no unit specified), as attached in my previous message. Does it occur at iteration 0 of the next time step? Why is it post-convergence call (current time step) if a simple mass balance is not checked? 

Feel free to ask if you need more info about the project,

Thanks a lot for helping me on this, 

Have a nice day,

Damien Casetta

INSA Lyon Génie Énergétique et Environnement
   
+33.6.71.78.03.75


On 3 May 2013 16:41, Flynn Ciaran <ciaran.flynn@aalto.fi> wrote:

Hey Damien,

 

Click on the “Lst file…” tab, you can see it from the screenshot you took. This will open your lst file and when you scroll to the bottom of it you will get more information about the type of errors you are getting.
(Note that to access this file directly, go to the same directory as your trnsys file and it’s the text file in the same name)

 

Hope this helps,

 

Bon wkd,

Ciarán

 


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