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Julien, Convergence problems are often the result of not having enough thermal capacitance in a loop. For instance if you have a massless solar collector, a pump and a constant effectiveness heat exchanger all in a loop and have neglected the pipes then there are no components in the loop that have thermal capacitance and the loop can change temperatures very very fast. You don't necessarily need to go through the whole system and add in every cm of piping but look at the warnings to find specifically what components are not converging and then look at those loops to see if you can add piping or a buffer tank to the loop to make it numerically more stable. You can also drop to a 1 minute time step as part of your solution. If you do go the route of using a time delay on inputs I would
suggest that you delay the values that your controllers are
watching. In my example above, for instance, you might delay the
outlet temperature of the collector that the controller is
watching. I would not advise delaying the temperature of the
collector that is being passed to the next component in the loop. kind regards, David On 12/5/2022 7:23 AM, Julien Gambade
via TRNSYS-users wrote:
-- *************************** David BRADLEY Principal Thermal Energy System Specialists, LLC 3 North Pinckney Street - suite 202 Madison, WI 53703 USA P:+1.608.274.2577 d.bradley@tess-inc.com http://www.tess-inc.com http://www.trnsys.com |