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[EnergyPlus_Support] Re: SystemTimeStep in EMS
I have set a code related with the timestep parameter. But If i change this parameter I have to change the code so it is not the best way. I prefer your EMS code so I am now implementing it. ;)
Thanks
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "dgerome06" <derochejerome@...> wrote:
>
> Ok,
> i have integrated an EMS code to avoid the problem. But i was thinking that it was possible to change parameters to solve it.
>
> Thanks all.
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Richard Raustad <RRaustad@> wrote:
> >
> > 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.
> > >
> > >
> >
> > --
> > Richard A. Raustad
> > Senior Research Engineer
> > Florida Solar Energy Center
> > University of Central Florida
> > 1679 Clearlake Road
> > Cocoa, FL 32922-5703
> > Phone: (321) 638-1454
> > Fax: (321) 638-1439 or 1010
> > Visit our web site at: http://www.fsec.ucf.edu
> >
> > UCF - From Promise to Prominence: Celebrating 40 Years
> >
>
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