You already have the answer from the previous email.
Here, it has first run a system timestep of 10 minutes (from 8:10 to 8:20), then later decided it should be shorter and repeated a system timestep that starts at 8:10 (from 8:10 to 8:13). Because of this and other iteration/timing issues, you will have a hard time counting up time entirely on your own.
The simulation ran at 8:10-8:20 and found that it had to shorten the system time step. So it ran that time again, but this time from 8:10 - 8:13.333, and then 8:13.333 - 8:16.667, and then 8:16.667 - 8:20. So the time 8:10-8:20 was repeated, this is where your error is. You have to account for that in your EMS code.
This example should give you an idea of what you need to do.
IF(SystemTimeStep < LastSysTStep)THEN
SET count = count - LastSysTStep
END IF
SET count = count + SystemTimeStep
SET LastSysTStep = SystemTimeStep
On 8/3/2011 5:34 AM, dgerome06 wrote:
I am already using built-in variable SystemTimeStep. My program is simple, just count the time spent during the simulation.
Program :
SET count = count + SystemTimeStep
The program is called "AfterPredictorAfterHVACManagers"
The outputvariable "count" is type "summed" and frequency "systemtimestep".
My timestep is 10min that is to say 0.167 hours.
The right column of the next array is what i expect to have and the left column is what i have in the spreadsheet.
33 33
33,16666667 33,16666667
66,91666667 33,33333333
67,58333333 33,5
68,25 33,66666667
68,91666667 33,83333333
69,58333333 34
70,25 34,16666667
106,3333333 34,33333333
107,3333333 34,5
72,25 34,66666667
36,33333333 34,83333333
36,5 35
This problem doesn't happen with a timestep of 2min.
I want to work with timestep=10 min so i need to find a solution.
I can send the edd file maybe it will be easier to understand.
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