[TRNSYS-users] Question regarding dynamic array values

[thornton at tess-inc.com]

On 2023-01-08 06:59, Böttner wrote:

> This works fine later in the simulation, but doesn't in the beginning.
> 
> For some reason I can't overwrite t_A after its initially read from
> the stored dynamic array, which is 0 initially.

Jan,

Are you using the dynamic array storage or the static array storage for 
storing/retrieving?  It sounds like you might want to be using static 
storage from your description.  Dynamic storage starts each iteration of 
a timestep from the same starting "point" and stores temporary values of 
the ending point each iteration; updating the starting point for the 
next timestep only after convergence is reached at the previous 
timestep.  It is best observed with a simple tank example.

Time = 0, Tank Temperature = 50 C
Time = 1, Iteration 1, Starting Temperature = 50 C Ending Temperature = 
60 C
Time = 1, Iteration 2, Starting Temperature = 50 C Ending Temperature = 
65 C
Time = 1, Iteration 3, Starting Temperature = 50 C Ending Temperature = 
63 C
Time = 1, Iteration 4, Starting Temperature = 50 C Ending Temperature = 
62 C
Convergence is reached
Time = 2, Iteration 1, Starting Temperature = 62 C Ending Temperature = 
65 C
etc.

Jeff



----
Jeff Thornton
President
Thermal Energy System Specialists (TESS)
3 N. Pinckney Street - Suite 202
Madison WI 53703
(608) 274-2577
www.tess-inc.com