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Dear all, I am a TRNSYS 15 user and I am facing problems with type 60 used to simulate a tank with 1 internal heat exchanger. Simulation seems to go on without problems but into the list file a warning message is sent by the type 60 when trying to solve the heat exchanger internal heat transfer coefficient (UAhx) like the following: %%% TYPE60 WARNING: UAhx UNABLE TO CONVERGE IN 500 ITERATIONS AT TIME= 8.000000 500 %%% I tried to change the number of nodes, the size of the heat exchanger and/or tank but that warning still continues to appear almost for all the timesteps (I am using 1/4-hour simulation timestep). I do not think I can trust those calculations while these warnings exists. Please, let me know if someone knows some possible solution\explanation. Thank you, Lorenzo |