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Barto, The flow rate out of the heat exchanger is equal to the flow rate into the heat exchanger. You should be able to use whatever output is providing the heat exchanger's inlet mass flow rate to also set the inlet mass flow rate of the component that comes after the heat exchanger. If making such a connection causes convergence problems then that is a different issue and I would guess that the reason for it is too long a time step. Keep in mind that TRNSYS can make one control decision (pump on/ pump off) once per timestep and that if you use a long timestep (such as an hour or even 15 minutes) then the controls cannot converge upon an on/off decision. Also make sure that you have some thermal capacitance in the loop made up of your solar collector, heat exchanger, and pump (in other words do not neglect the piping that connects all of those things. Kind regards, David On 3/30/2014 14:42, Barto Pene wrote:
-- *************************** David BRADLEY Principal Thermal Energy Systems Specialists, LLC 22 North Carroll Street - suite 370 Madison, WI 53703 USA P:+1.608.274.2577 F:+1.608.278.1475 d.bradley@tess-inc.com http://www.tess-inc.com http://www.trnsys.com |