def epw_to_ddy(epw_file, percentile, output_file):
"""Get a DDY file with a heating + cooling design day from this EPW.
This method will first check if there is a heating or cooling design day
that meets the input percentile within the EPW itself. If None is
found, the heating and cooling design days will be derived from analysis
of the annual data within the EPW, which is usually less accurate.
\b
Args:
epw_file: Path to an .epw file.
"""
try:
epw_obj = EPW(epw_file)
ddy_obj = DDY(epw_obj.location, epw_obj.best_available_design_days(percentile))
output_file.write(ddy_obj.to_file_string())
except Exception as e:
_logger.exception('DDY translation failed.\n{}'.format(e))
sys.exit(1)
else:
sys.exit(0)
# create simulation parameters for a design-day-optimized E+ sim
_sim_par_ = SimulationParameter()
_sim_par_.timestep = _timestep_ if _timestep_ is not None else 6
_sim_par_.output.reporting_frequency = 'Timestep'
_sim_par_.simulation_control.run_for_sizing_periods = True
_sim_par_.simulation_control.run_for_run_periods = False
if run_bal_:
_sim_par_.output.add_zone_energy_use('Sensible')
_sim_par_.output.add_gains_and_losses('Sensible')
_sim_par_.output.add_surface_energy_flow()
# load design days to the simulation parameters
if _ddy_file.lower().endswith('.epw'): # load design days from EPW
epw_obj = EPW(_ddy_file)
des_days = epw_obj.best_available_design_days()
_sim_par_.sizing_parameter.design_days = des_days
location = epw_obj.location
else: # load design days from DDY
ddy_obj = DDY.from_ddy_file(_ddy_file)
w_days = [
day for day in ddy_obj.design_days
if day.day_type == 'WinterDesignDay'
]
s_days = [
day for day in ddy_obj.design_days
if day.day_type == 'SummerDesignDay'
]
check_and_filter_des_days(_sim_par_, w_days, 'WinterDesignDay')
check_and_filter_des_days(_sim_par_, s_days, 'SummerDesignDay')
location = ddy_obj.location
