Dear Nicola,
I am not quite sure if I interpretted this correctly across our
Italian-English barrier; however, I will offer some tips about choosing an
appropriate time step. First, a good rule-of-thumb is to keep your
timestep in the units of hours. You can do this either by assigning an
appropriate decimal (i.e. 0.125 hr for 7.5 minutes) or by using a string
like the attached jpeg (i.e. 5/60 for a 5 minute timestep, 1/60 for a 1
minute timestep, 25/3600 for a 25 second timestep, etc.). In another note
about timesteps, please realize that controllers in your simulation will
make a control decision once per timestep. Thus, you would not want to
have a 1 hr timestep if you have a controller in your simulation. Last, if
you are concerned about how low you can bring your timestep, simply
decrease it until you notice the results are uneffected or do not change
much.
Best regards,
Matt Duffy
----- Original Message -----
From: "Nicola Sorbi Unipg" <nicolasorbi@mach.ing.unipg.it>
Sent: Wed, September 23, 2009 5:24
Subject:[TRNSYS-users] Time Step
Dear all,
I have a question: Who the Time Step influences the simulation results?
I have trouble in choosing the correct Time step!!!
Regards
Dott. Ing. Nicola Sorbi
UNIVERSITA' DEGLI STUDI DI PERUGIA
Dipartimento di Ingegneria Industriale
Via G. Duranti 1A/4 - 06125 Perugia
Tel. +39 075/5853930 - Fax. +39 075/5853736
E-mail nicolasorbi@mach.ing.unipg.it
_______________________________________________
TRNSYS-users mailing list
TRNSYS-users@cae.wisc.edu
https://www-old.cae.wisc.edu/mailman/listinfo/trnsys-users
----- End of original message -----
Attachment:
TIMESTEP.jpg
Description: image/pjpeg