I'm not used to simulation softwares such as SAM, so maybe my mistake is trivial, in any way, every help is appreciated:
My intention in running a simulation on a 20 MWe CSP Tower plant is to get some data and numbers, LCOEs, total costs, annual production, the farthest I got was using the SamUL from the sample file and running it to find a decently enough minimized LCOE output for some solar multiples with 15h TES.
Now I decided to test thermocline TES, and after simulation, I get a warning, always the same, I already tried changing input values that seemed relevant, and the warning remains. Loading the Gemasolar comparison (sam_case_csp_salt_tower_gemasolar_2013-1-15.zsam) and switching it to Thermocline gives the same warning. The sample file and the file associated with the latest reports (sam-costs-2013-molten-salt-power-tower.zsam)
Here is the warning
"trnsys.tower: WARNING: The temperature for Salt (60% NaNO3, 40% KNO3) was outside of the fluid's operating range of 220.- 593. [C] for at least 50 time steps. The fluid temperature on the 50th occurrence was ***** [C] at timestep 27.0. Try changing the design parameters or fluid to ensure operating temperatures stay within the range."
As a reference, starting a new project and only switching from two-tank to thermocline also produces the warning after running the simulation.
Even though I could not find any crass visible error or inconsistency with some basic graphs in the simulations with the warning, I decided not to go ahead and use the data due to possible "hidden" modeling math errors.
I did read the help files and some literature on thermocline use on CSP Molten Salt Power Tower, my issue is probably at understanding of the software, or so I hope.
Any insights or suggestions?
Thank you in advance.