Energy+ and FMU initial conditions problem

asked 2019-03-15 07:09:09 -0500

Paolo gravatar image

updated 2019-03-17 11:11:45 -0500

Deal all, I wrapped an EnergyPlus model using the EnergyPlusToFMU tool. Since we will run experiment in real time and with setpoints/meteo/renewableEnergy that comes from the outside (optimization, weather station, PVstation), I configured the idf in order to accept all this external signals. Everything seems to work correctly, a part for one thing. Rooms temperature (and %humidity) at the beginning of the simulation are really low (see picture 1 where the first day is represented, 180s simulation timestep). The strange thing is that if I remove the actuator that overwrites the outdoor air bulb temperature, temperatures initialize well!

ps: I launched the two FMU with a simulator. The only difference between the two FMUs is the above-mentioned actuator (that I must use!) Could be this a bug? Thank in advance for the answer. Paolo



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Have you set the initial conditions of the ExternalInterface actuators you are using?Those are the values which will be used during warm-up period of your model.

Thierry Nouidui gravatar imageThierry Nouidui ( 2019-03-15 14:18:34 -0500 )edit

Hi Thierry, yes, I set the initial conditions and I found two issues: 1) for any initial conditions I set (weather variables or heating set point) the room temperature initialization does not change. 2) if I try to left the field in blank, simulation gives a fatal error at the beginning.

Best, Paolo

Paolo gravatar imagePaolo ( 2019-03-18 03:44:27 -0500 )edit