[E+, BCVTB] How to input dynamic data (for time t+1) into E+ that depends on the output variable (at time t)

asked 2017-09-18 05:26:03 -0600

cs_bot
247 ●1 ●5

updated 2017-09-22 11:07:38 -0600

__AmirRoth__

4446 ●5 ●17 http://bleedinggreenna...

I am new to the field. so please feel free to correct me if I'm wrong.

Say I have to simulate a model that has the requirement of getting dynamic inputs (after some pre-processing) My typical flow is:

At time t: After the output variables are generated, write them onto a file.

Retrieve data from the file, and based on this, generate parameters dynamically for the next timestep. Now write this onto a file

At time t+1: The newly generated parameters is used as input to E+ for the next time step.

... and so on.

Is this above design feasible in EnergyPlus? If yes, a detailed explanation will be hugely appreciated.

Note: The crux of the query is whether control can be transferred from E+ to external programs (say for each minute of simulation) to fetch the inputs for the next timestep (which also happens to depend on the previous timestep's output)

answered 2017-09-22 10:24:59 -0600

Michael Wetter
1695 ●12 ●4 http://simulationresea...

You could implement such a processing if you use the ExternalInterface and then do the control either in a Functional Mockup Unit, or in the BCVTB.

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Comments

Can you please elaborate on the 'how' part? I am using timestep t's output of EnergyPlus, feeding it to another program (written in c++, say), and getting the output of that program to be fed as (t+1)th time input to E+. (with files preferably as the intermediate)

cs_bot ( 2017-09-29 01:37:22 -0600 )edit

See http://simulationresearch.lbl.gov/fmu... and the examples in http://simulationresearch.lbl.gov/fmu... Once you have E+ exported as an FMU, you can import it as an input/output block in a variety of free programmable environments that support FMI 1.0 for co-simulation, such as the BCVTB, Dymola, OpenModelica, PyFMI, Simulink etc.

Michael Wetter ( 2017-10-03 22:51:42 -0600 )edit

E+ exported AS an FMU or FOR it? Also, which object variable should I be tweaking to attain this? Schedule, EMS variable or EMS actuator?

cs_bot ( 2017-10-17 01:59:15 -0600 )edit

Dear Michael, Is it fair to say that another alternative is to use SystemCommand (under Actors -> Simulator, (authored by you)) in BCVTB to call C programs to further call other C/C++ functions if necessary (for a very C-specific implementation along with E+ and BCVTB)?

cs_bot ( 2017-10-24 02:01:10 -0600 )edit

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