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[TRNSYS-users] Difficulty with convergency



Dear Users,

I am simulating a building which is cooled or heated by heat generated by sollar collectors and stored in Stratified tank type4. The simulation goes well with 6oo liters volume of the tank. Then i decided to reduced the size of the tank to reach an optimum volume. I tried for the cases of 500 to 100 liters and got the results but when reducing the volume to 50 liters the simulation diverges because of many warnings stating that many types in the simulation did not converge at this time step(30s). Therefore, i decided to decrease the timestep. I repeated the simulation even for the least time stem defined in trnsys but it did not converge. I also tried to change the relaxation factor but didnt work. I read that some people suggest that if i increase the convergence criteria or the limit number for warnings in the control cards, it will converge but it is not solving the problem. Actually it seems like cheating. Please help me to solve the problem.

Best regards,
Behzad shahzamanian sichani