Re: [TRNSYS-users] Type 22

[David Bradley <bradley@tess-inc.com>]

Krishna,
  One solution could be that you use either Type93 or Type573 (in
the TESS Libraries) to delay the temperature you are monitoring by one
time step and then to control based on the delayed temperature. In order
to do this, you need to have a relatively small time step (on the order
of 5 minutes or less) but by controlling on the system values from one
time step previous, you are guaranteed to always be controlling based on
a converged value.
Cheers,
  David 

At 09:18 AM 7/20/2005, Krishna wrote:
>     I have a system with iterative feedback
> controller(Type 22) to control the flow rate based on the error
> signal(Temperature). In the secant method used by this type, one
> assumption would be that the error signal produced by a control signal is
> repeatable (so that the control signal can be interpolated). But it takes
> a few iterations for the system to give out a constant error signal(i.e
> Converged values) for a given control signal.
>    This makes the secant method unusable unless we use the
> converged values to determine what the next control signal should
> be.
>    One way to work over this could be that we check for
> convergence and the calculate the new control signal and then instruct
> trnsys that the system is not converged yet for the current time step and
> do this until the desired control signal is calculated.
>  
> Could anyone please let me know if this is
> possible or if there is a better method to solve this problem.
> Thank you,
> krishna
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> TRNSYS-users@engr.wisc.edu
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