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Behzad, You have caught the most common error (too long a time step)
and I must admit that I am not sure why reducing the timestep so
far did not make the simulation start converging again. The reason
that reducing the time step helps is that if you have pumps (or
fans) that are pushing a greater volume of fluid around a loop in
one time step than the devices that have thermal capacitance can
hold then the problem can become numerically unstable. Devices
that have thermal capacitance are storage tanks, pipes, and the
building (if there is one). I think you'll need to use the TRACE tool (the icon with the
foot prints in the toolbar on the left of the simulation studio).
Activate TRACE on the components that are being flagged as not
converging in the error/warning log. What TRACE does is to write
the values of all the parameters, inputs, and outputs for each of
the activated components to the *.lst file at every iteration. By
looking at the outputs and inputs from one iteration to the next,
you can tell specifically which one(s) are causing problems.
Unfortunately TRACE writes a lot of information to the *.lst file
and it can be a bit hard to find what you are looking for.
However, it is a handy tool in cases like this. kind regards, David
On 12/10/2018 08:17, up201700037 via
TRNSYS-users wrote:
Dear Users, -- *************************** David BRADLEY Principal Thermal Energy Systems Specialists, LLC 3 North Pinckney Street - suite 202 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 |