[TRNSYS-users] Solvers

[Technical Support]

Max,
  TRNSYS components do indeed output the average value over each time step. The value that you see in the online plotter is almost always the average value over the previous time step. Components that have differential equations in them have to also calculate the values at the beginning and end of the timestep. Normally, there is no way for you to see what the value at the end of a time step is because the components do not place these values into the list of outputs. I think that without running the project from a Fortran compiler and using it to look at intermediate values (values that are calculated inside the Types but not put into the outputs list) it would be hard to know what the values at the beginning and end of the time step actually are.
Kind regards,
 David





Technical Support TeamThermal Energy System Specialists, LLC2916 Marketplace Dr, Suite 104Madison, WI 53719techsupport at tess-inc.com

----- Original Message -----

Subject: [TRNSYS-users] Solvers

From: "Max Werlein" >;maxwithhat at hotmail.com>

Date: Wed, May 7, 2008 3:00




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Dear List,
I solved a a differential equation withe the CALL DIFFERENTIAL_EQN(TIME, AA, BB, Tinit, Tout, TBAR) function.I read in the Manual that Tbar is an average value of the output value over the Timestep and schould be taken as output for the folloing component. I'd actually like to know how it is exsactly calculated because I found it not to just be the Mean value between the inlet and outlet value at each timstep.
Thanks very much,
Max

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