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From: laila Bahgat (firstname.lastname@example.org)
I'll very much appreciate your help regarding this point: I met some difficulties in setting the options of the new variation menu to represent the duration of my influent file. My file records the values of model fractions for a period of 14 days where data is recorded every 15 minutes (typical to the influent data files provided by the COST simulation benchmark). As the cycle represents 1 day I've set the duration to 24 hours, and the number of points in a cycle to 96 points (4 times/hr * 24 hours). Thus the data of one day only was copied from the Excel file to the variation form. It says in the online help that the simulation period can be set to several cycles when dynamic simulation is chosen, but how to make the variation form take more values than those of one cycle. Another issue I've noticed that if the number of rows of the copied Excel book column is large i.e. whenever a whole column of my file is marked & copied (14 days * 24 hrs * 4 times per hr), this does not activate the (from clipboard) option. Thank you very much for your feedback.
The idea of the variation file is that you define there one cycle. You may simulate several cycles in the dynamic simulation but for each cycle the same variation is taken. There are two ways to by-pass this restriction: - you choose a cycle length of 14 days. But then you can define only 96 variation values for this period. Your time resolution is only 3.5 hours i.e. 14 times less than your data. - you choose a cycle of one day. Choosing 96 variation values correspond to a time resolution of 15 min. But then you have to define 14 variation files, each for one day of the period of 14 days. Then you have to load each variation file and perform a simulation. The state of the plant is not reset at the beginning of the simulation. I admit that this procedure is time-consuming and not very elegant :-( I will ask Prof. Gujer if there is other possibility to simulate it.
Many thanks for the feedback.
A variation with a time resolution of 15 min is only required if your degradation is way beyond 99%. Typically it is sufficient to reduce your time resolution to say 2 hrs per step. This means that you may model your 14 days with two consecutive variation files.