Example usage of energyplus.fmu with JModelica and PyFMI

energyplus_fmu_jmodelica_example.py

import os
from pymodelica import compile_fmu
from pyfmi import load_fmu
import matplotlib.pyplot as plt

# add energyplus cli script to $PATH, not needed if already in $PATH
os.environ['PATH'] = os.environ['PATH'] +":/opt/EnergyPlus/EnergyPlus-8-9-0"

# load .fmu with pyfmi
fmu_path = '<path>/_fmu_export_variable.fmu'
model = load_fmu(fmu=fmu_path)

# change input variable (default in .idf is given to be 6)
model.set('yShadeFMU', 1)

# get options object
opts = model.simulate_options()

# set number of communication points dependent on final_time and .idf steps per hour
final_time = 60*60*72. # 72 hour simulation
idf_steps_per_hour = 6
ncp = final_time/(3600./idf_steps_per_hour)
opts['ncp'] = ncp

# run simulation and return results
res = model.simulate(start_time=0., final_time=final_time, options=opts)
print(res.keys()) # show result variables names

# plot results
fig, ax1 = plt.subplots()
ax1.plot(res['time'], res['TRoo'], 'b-')
ax1.set_xlabel('time (s)')
ax1.set_ylabel('Room Temperature', color='b')
ax1.tick_params('y', colors='b')

ax2 = ax1.twinx()
ax2.plot(res['time'], res['ISolExt'], 'r.')
ax2.set_ylabel('Solar Radiation', color='r')
ax2.tick_params('y', colors='r')
fig.tight_layout()
plt.show()

@TStesco - When I plot a time series of yShadeFMU, it's always 0. I've tried running several days and also using the input parameter of simulate but yShadeFMU seem to always be 0. Have you noticed the same thing?

Hi there. I am experimenting with FMU at the moment. I would really appreciate it if you could share the IDF file that goes along with this. It would help me understand how the IDF file should be structured in order to get this to work. Thanks!

Seems like 0s are expected, see here. The IDF should be the ones that come as examples with EnergyPlusToFMU.

Hi @stef-papathan and @lymereJ , I am wondering if you have solved this issue. I am struggling with the same issue. I am working with this EnergyPlusToFMU (v.3.1.0, latest version) example file: https://raw.githubusercontent.com/lbl-srg/EnergyPlusToFMU/master/Examples/Actuator/_fmu-export-actuator.idf
My version of EnergyPlus is v.9.4.0 which is the same as the version of the IDF file. Thank you.

Here is the result I got: