Camilo, The simulation does not have enough thermal capacitance to solve - you need to add a pipe (and perhaps a pump as well) so that the liquid contained in your loop has enough mass that its temperature changes over some time instead of instantaneously. Make sure that the pipe is big enough to hold at least one timestep of fluid at your chosen flow rate. I would also recommend making your tolerances smaller (they should be no larger than 0.0001 instead of the default, which is 0.001) and running with a smaller time step (I usually use 1 or sometimes minutes) Kind regards, David Camilo Arias wrote:
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