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Med. Omar FANNAN, This list is intended as a place in which users can assist
other users although it is often used as a starting point for
technical support. If you have specific technical support
questions you should email them to the distributor from whom you
(or your institution) purchased TRNSYS. If you aren't sure who to
contact then please send me an email directly (i.e. not to this
list) and include the information from your user17 (which can be
opened with a text editor). The list and description of TRNSYS access functions such as getIsConvergenceReached() can be found in the 07ProgrammersGuide manual in the ..\Trnsys17\Documentation\ folder. Convergence can be impacted by component order. You can change the component order by clicking on the "control cards" tool in the left hand toolbar (where you set the simulation start and stop times) and then switching to the component order tab. Convergence problems can be hard to track down because there
can be many causes. Here are a few hints about them. - make sure that your timestep is not too long. TRNSYS can only
make one control decision per timestep. If you are using a long
timestep and are using a controller model to control a system that
has a time constant shorter than your timestep you are going to
run into convergence problems. Time steps should typically be on
the order of 1 to 5 minutes. - make sure you have enough thermal capacitance in your system. This is basically the same as the above point; thermal capacitance increases the time constant of the system and causes it to respond more slowly (and more realistically) to control state changes. - you can look in the *.lst and *.log files to find out which components are failing to converge. kind regards, David
On 06/20/2016 05:12, Med. Omar FANNAN
via TRNSYS-users wrote:
-- *************************** David BRADLEY Principal Thermal Energy Systems Specialists, LLC 22 North Carroll Street - suite 370 Madison, WI 53703 USA P:+1.608.274.2577 F:+1.608.278.1475 d.bradley@tess-inc.com http://www.tess-inc.com http://www.trnsys.com |