Ventana software support forum

I have an input variable (Demand) that is given every 15 minutes for 12 months and I need to gather this data of 15 minutes in 1 hour to get the consumption, I need between annual data and that are presented monthly, the objective is to get the Value of the monthly energy bill that is the result of the sum of consumption multiplied by the consumption rate and demand multiplied by the demand rate, how can I do that?

I don't really follow what you are asking, but it sounds like a job for Excel.

At first, the demand is an initial variable, after it is reduced as a function of a generator of energy that is inserted in the system, where the feedback is present generating a new variable of demand and another of consumption, for that reason I have to do this in Vensim . I need to know the function that does and displays the average for every 4 data and also if it is possible to make an accumulator that in a certain period is zeroed and starts counting again.

Priscila wrote:At first, the demand is an initial variable, after it is reduced as a function of a generator of energy that is inserted in the system, where the feedback is present generating a new variable of demand and another of consumption, for that reason I have to do this in Vensim .

ok. This was not clear in your initial question.

Priscila wrote:I need to know the function that does and displays the average for every 4 data

Does this help?
http://www.vensim.com/documentation/ind ... _trend.htm

Priscila wrote:and also if it is possible to make an accumulator that in a certain period is zeroed and starts counting again.

Use a level and empty it using level/time step when you want it zeroed.

Use a level and empty it using the level / time step when you want it to be zeroed.
Could you give me an example?

This will reset the level at time = 10.

That way I can show the values ​​at each time interval, every 10, but I can not reset the accumulator. I need, for example, to add from 0 to 10, to zero the count add from 11 to 22 and so on and show on the same variable.

Does the vensim software contain no more than 8000 data in tabular form?

Priscila wrote:That way I can show the values ​​at each time interval, every 10, but I can not reset the accumulator. I need, for example, to add from 0 to 10, to zero the count add from 11 to 22 and so on and show on the same variable.

I think this would be much easier if you upload the model you are working on so we can see. I'm really struggling to understand what you are trying to do.

Priscila wrote:Does the vensim software contain no more than 8000 data in tabular form?

Correct.

The variable invoice is the sum of demand (given every 15 minutes) times the tariff of demand + consumption (which is the sum of demand every 1 hour) times the consumption tariff ...
The consumption variable should be the average of the four demand values, so that the data every 15 minutes are transformed into hourly data. After these hourly data must be added every month, that is, they need to be accumulated from time 0 to time 2975, from time 2976 to time 5759 and so on until total sum of monthly consumptions.
Lastly, the invoice variable must be calculated monthly, that is, it accumulates until the time 2975, it zeroes and it begins to accumulate of the time 2976 until 5759, zera and begins to accumulate in 5760 until 8735 and so on.
There are a total of 14 months of simulation.
Also, after the simulation I need to transfer the data to excel, this is possible given that it is a total of 40800 data.

I cannot find a parameter called "invoice" in your model.

I think it might be better if you first try and follow some best practice on your model. It doesn't pass the most basic of tests (dimensional consistency), it's impossible for me to work out what the model is supposed to do or if any of the calculations are correct (what is demand even measured in?).

I have a series of 9 data:
2
3
1
2
4
5
6
7
5
It is necessary to obtain in the vensim, the maximum value comparing every 3 intervals as follows:
0
0
3
0
0
5
0
0
7
How can I perform this operation
Also, how do I export the values obtained in a simulation with more than 8000 times

Priscila wrote:I have a series of 9 data:
2
3
1
2
4
5
6
7
5
It is necessary to obtain in the vensim, the maximum value comparing every 3 intervals as follows:
0
0
3
0
0
5
0
0
7
How can I perform this operation

Where is the logic in this? Why are there zeros if you are calculating the maximum over 3 intervals?

Also, how do I export the values obtained in a simulation with more than 8000 times

Vensim documentation, search for export.

Administrator wrote: ↑Mon Jun 26, 2017 1:41 pm

Code: Select all

some level = integ (inflow - outflow - reset level, initial stock)

reset level = if then else ( time = 10 , some level / time step , 0 )

This will reset the level at time = 10.

Good Morning,

As above the variable is reset at time 10, how can I reset a variable with a fixed time, for example whenever I complete 30 days.

Do you have a variable that indicates when 30 days have elapsed? If yes,

reset level = if then else ( variable that indicates time has elapsed = 1 , some level / time step , 0 )

Working with energy demand data, this data is every 15 minutes, so every 2784 data I have a month, how can I create the variable that informs when one month ends and starts the other to be able to use the equation above and reset whenever ends a month.

Can you upload a sample of what you are working with and the model you are attempting to build? It's difficult to suggest an answer unless we can see what you have.

The template is attached in the Fatura tab. To give continuity in the precise modeling find the maximum value of demand each month, represented by the variable Máxima demanda faturada Ponta, with one month being 2785 data each.

Hello,

You have an answer, which function can I use.

I've attached a model showing how to get a variable = 1 when a month is complete.

Thank you so much, I was able to solve some of my problem.
One more question, it is possible to reset a SAMPLE IF TRUE variable

You reset a sample if true by making the first argument to the function true.

I need to find the maximum value of a variable every month, however using SAMPLE IF TRUE this variable is accumulated and this is not what I need. What function could I use, having the variable that tells me when it starts a new month.

The datedemo model I uploaded gives you a variable that is 1 when it's a new month, and zero at all other times.