Class: BTAP::Environment::WeatherFile

Inherits:
Object
  • Object
show all
Defined in:
lib/openstudio-standards/weather/Weather.Model.rb

Constant Summary collapse

YEAR = 
0
MONTH = 
1
DAY = 
2
HOUR = 
3
MINUTE = 
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DATA_SOURCE = 
5
DRY_BULB_TEMPERATURE = 
6
DEW_POINT_TEMPERATURE = 
7
RELATIVE_HUMIDITY = 
8
ATMOSPHERIC_STATION_PRESSURE = 
9
EXTRATERRESTRIAL_HORIZONTAL_RADIATION =

not used

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EXTRATERRESTRIAL_DIRECT_NORMAL_RADIATION =

not used

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HORIZONTAL_INFRARED_RADIATION_INTENSITY = 
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GLOBAL_HORIZONTAL_RADIATION =

not used

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DIRECT_NORMAL_RADIATION = 
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DIFFUSE_HORIZONTAL_RADIATION = 
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GLOBAL_HORIZONTAL_ILLUMINANCE =

not used

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DIRECT_NORMAL_ILLUMINANCE =

not used

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DIFFUSE_HORIZONTAL_ILLUMINANCE =

not used

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ZENITH_LUMINANCE =

not used

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WIND_DIRECTION = 
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WIND_SPEED = 
21
TOTAL_SKY_COVER =

not used

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OPAQUE_SKY_COVER =

not used

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VISIBILITY =

not used

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CEILING_HEIGHT =

not used

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PRESENT_WEATHER_OBSERVATION = 
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PRESENT_WEATHER_CODES = 
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PRECIPITABLE_WATER =

not used

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AEROSOL_OPTICAL_DEPTH =

not used

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SNOW_DEPTH = 
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DAYS_SINCE_LAST_SNOWFALL =

not used

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ALBEDO =

not used

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LIQUID_PRECIPITATION_DEPTH = 
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LIQUID_PRECIPITATION_QUANTITY = 
34

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(weather_file) ⇒ String

This method initializes and returns self.

Parameters:

Author:



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 392

def initialize(weather_file)
  # First check if the epw file exists at a full path.  If not found there,
  # check for the file in the openstudio-standards/data/weather directory.
  weather_file = weather_file.to_s
  @epw_filepath = nil
  @ddy_filepath = nil
  @stat_filepath = nil
  if File.exist?(weather_file)
    @epw_filepath = weather_file.to_s
    @ddy_filepath = weather_file.sub('epw', 'ddy').to_s
    @stat_filepath = weather_file.sub('epw', 'stat').to_s
  else
    # Run differently depending on whether running from embedded filesystem in OpenStudio CLI or not
    if __dir__[0] == ':' # Running from OpenStudio CLI
      # load weather file from embedded files
      epw_string = load_resource_relative("../../../data/weather/#{weather_file}")
      ddy_string = load_resource_relative("../../../data/weather/#{weather_file.gsub('.epw', '.ddy')}")
      stat_string = load_resource_relative("../../../data/weather/#{weather_file.gsub('.epw', '.stat')}")

      # extract to local weather dir
      weather_dir = File.expand_path(File.join(Dir.pwd, 'extracted_files/weather/'))
      puts "Extracting weather files to #{weather_dir}"
      FileUtils.mkdir_p(weather_dir)
      File.open("#{weather_dir}/#{weather_file}", 'wb') { |f| f << epw_string; f.flush }
      File.open("#{weather_dir}/#{weather_file.gsub('.epw', '.ddy')}", 'wb') { |f| f << ddy_string; f.flush }
      File.open("#{weather_dir}/#{weather_file.gsub('.epw', '.stat')}", 'wb') { |f| f << stat_string; f.flush }
    else # loaded gem from system path
      top_dir = File.expand_path('../../..', File.dirname(__FILE__))
      weather_dir = File.expand_path("#{top_dir}/data/weather")
    end

    @epw_filepath = "#{weather_dir}/#{weather_file}"
    @ddy_filepath = "#{weather_dir}/#{weather_file.sub('epw', 'ddy')}"
    @stat_filepath = "#{weather_dir}/#{weather_file.sub('epw', 'stat')}"
  end

  # Ensure that epw, ddy, and stat file all exist
  raise("Weather file #{@epw_filepath} not found.") unless File.exist?(@epw_filepath) && @epw_filepath.downcase.include?('.epw')
  raise("Weather file ddy #{@ddy_filepath} not found.") unless File.exist?(@ddy_filepath) && @ddy_filepath.downcase.include?('.ddy')
  raise("Weather file stat #{@stat_filepath} not found.") unless File.exist?(@stat_filepath) && @stat_filepath.downcase.include?('.stat')

  # load file objects.
  @epw_file = OpenStudio::EpwFile.new(OpenStudio::Path.new(@epw_filepath))
  if OpenStudio::EnergyPlus.loadAndTranslateIdf(@ddy_filepath).empty?
    raise "Unable to load ddy idf file#{@ddy_filepath}."
  else
    @ddy_file = OpenStudio::EnergyPlus.loadAndTranslateIdf(@ddy_filepath).get
  end
  @stat_file = EnergyPlus::StatFile.new(@stat_filepath)

  # assign variables.

  @latitude = @epw_file.latitude
  @longitude = @epw_file.longitude
  @elevation = @epw_file.elevation
  @city = @epw_file.city
  @state_province_region = @epw_file.stateProvinceRegion
  @country = @epw_file.country
  @hdd18 = @stat_file.hdd18
  @cdd18 = @stat_file.cdd18
  @hdd10 = @stat_file.hdd10
  @cdd10 = @stat_file.cdd10
  @heating_design_info = @stat_file.heating_design_info
  @cooling_design_info  = @stat_file.cooling_design_info
  @extremes_design_info = @stat_file.extremes_design_info
  @monthly_dry_bulb = @stat_file.monthly_dry_bulb
  @mean_dry_bulb = @stat_file.mean_dry_bulb
  @delta_dry_bulb = @stat_file.delta_dry_bulb
  @location_name = "#{@country}-#{@state_province_region}-#{@city}"
  @energy_plus_location_name = "#{@city}_#{@state_province_region}_#{@country}"
  @climate_zone = @stat_file.climate_zone
  @standard = @stat_file.standard
  @summer_wet_months = @stat_file.summer_wet_months
  @winter_dry_months = @stat_file.winter_dry_months
  @autumn_months = @stat_file.autumn_months
  @spring_months = @stat_file.spring_months
  @typical_summer_wet_week = @stat_file.typical_summer_wet_week
  @typical_winter_dry_week = @stat_file.typical_winter_dry_week
  @typical_autumn_week = @stat_file.typical_autumn_week
  @typical_spring_week = @stat_file.typical_spring_week
  @db990 = @heating_design_info[2]
  return self
end

Instance Attribute Details

#autumn_months ⇒ Object

Returns the value of attribute autumn_months.



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 320

def autumn_months
  @autumn_months
end

#cdd10 ⇒ Object

Returns the value of attribute cdd10.



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 320

def cdd10
  @cdd10
end

#cdd18 ⇒ Object

Returns the value of attribute cdd18.



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 320

def cdd18
  @cdd18
end

#city ⇒ Object

Returns the value of attribute city.



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 320

def city
  @city
end

#climate_zone ⇒ Object

Returns the value of attribute climate_zone.



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 320

def climate_zone
  @climate_zone
end

#cooling_design_info ⇒ Object

Returns the value of attribute cooling_design_info.



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 320

def cooling_design_info
  @cooling_design_info
end

#country ⇒ Object

Returns the value of attribute country.



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 320

def country
  @country
end

#db990 ⇒ Object

Returns the value of attribute db990.



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 320

def db990
  @db990
end

#ddy_filepath ⇒ Object

Returns the value of attribute ddy_filepath.



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 320

def ddy_filepath
  @ddy_filepath
end

#delta_dry_bulb ⇒ Object

Returns the value of attribute delta_dry_bulb.



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 320

def delta_dry_bulb
  @delta_dry_bulb
end

#elevation ⇒ Object

Returns the value of attribute elevation.



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 320

def elevation
  @elevation
end

#energy_plus_location_name ⇒ Object

Returns the value of attribute energy_plus_location_name.



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 320

def energy_plus_location_name
  @energy_plus_location_name
end

#epw_filepath ⇒ Object

Returns the value of attribute epw_filepath.



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 320

def epw_filepath
  @epw_filepath
end

#extremes_design_info ⇒ Object

Returns the value of attribute extremes_design_info.



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 320

def extremes_design_info
  @extremes_design_info
end

#hdd10 ⇒ Object

Returns the value of attribute hdd10.



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 320

def hdd10
  @hdd10
end

#hdd18 ⇒ Object

Returns the value of attribute hdd18.



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 320

def hdd18
  @hdd18
end

#heating_design_info ⇒ Object

Returns the value of attribute heating_design_info.



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 320

def heating_design_info
  @heating_design_info
end

#latitude ⇒ Object

Returns the value of attribute latitude.



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 320

def latitude
  @latitude
end

#location_name ⇒ Object

Returns the value of attribute location_name.



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 320

def location_name
  @location_name
end

#longitude ⇒ Object

Returns the value of attribute longitude.



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 320

def longitude
  @longitude
end

#monthly_dry_bulb ⇒ Object

Returns the value of attribute monthly_dry_bulb.



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 320

def monthly_dry_bulb
  @monthly_dry_bulb
end

#spring_months ⇒ Object

Returns the value of attribute spring_months.



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 320

def spring_months
  @spring_months
end

#standard ⇒ Object

Returns the value of attribute standard.



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 320

def standard
  @standard
end

#stat_filepath ⇒ Object

Returns the value of attribute stat_filepath.



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 320

def stat_filepath
  @stat_filepath
end

#state_province_region ⇒ Object

Returns the value of attribute state_province_region.



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 320

def state_province_region
  @state_province_region
end

#summer_wet_months ⇒ Object

Returns the value of attribute summer_wet_months.



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 320

def summer_wet_months
  @summer_wet_months
end

#typical_autumn_week ⇒ Object

Returns the value of attribute typical_autumn_week.



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 320

def typical_autumn_week
  @typical_autumn_week
end

#typical_spring_week ⇒ Object

Returns the value of attribute typical_spring_week.



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 320

def typical_spring_week
  @typical_spring_week
end

#typical_summer_wet_week ⇒ Object

Returns the value of attribute typical_summer_wet_week.



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 320

def typical_summer_wet_week
  @typical_summer_wet_week
end

#typical_winter_dry_week ⇒ Object

Returns the value of attribute typical_winter_dry_week.



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 320

def typical_winter_dry_week
  @typical_winter_dry_week
end

#winter_dry_months ⇒ Object

Returns the value of attribute winter_dry_months.



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 320

def winter_dry_months
  @winter_dry_months
end

Instance Method Details

#a169_2006_climate_zone ⇒ String

This method returns the Thermal Zone based on cdd10 and hdd18

Returns:

Author:



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 479

def a169_2006_climate_zone
  cdd10 = self.cdd10.to_f
  hdd18 = self.hdd18.to_f

  if cdd10 > 6000 # Extremely Hot  Humid (0A), Dry (0B)
    return 'ASHRAE 169-2006-0A'

  elsif (cdd10 > 5000) && (cdd10 <= 6000) # Very Hot  Humid (1A), Dry (1B)
    return 'ASHRAE 169-2006-1A'

  elsif (cdd10 > 3500) && (cdd10 <= 5000) # Hot  Humid (2A), Dry (2B)
    return 'ASHRAE 169-2006-2A'

  elsif ((cdd10 > 2500) && (cdd10 < 3500)) && (hdd18 <= 2000) # Warm  Humid (3A), Dry (3B)
    return 'ASHRAE 169-2006-3A' # and 'ASHRAE 169-2006-3B'

  elsif (cdd10 <= 2500) && (hdd18 <= 2000) # Warm  Marine (3C)
    return 'ASHRAE 169-2006-3C'

  elsif ((cdd10 > 1500) && (cdd10 < 3500)) && ((hdd18 > 2000) && (hdd18 <= 3000)) # Mixed  Humid (4A), Dry (4B)
    return 'ASHRAE 169-2006-4A' # and 'ASHRAE 169-2006-4B'

  elsif (cdd10 <= 1500) && ((hdd18 > 2000) && (hdd18 <= 3000)) # Mixed  Marine
    return 'ASHRAE 169-2006-4C'

  elsif ((cdd10 > 1000) && (cdd10 <= 3500)) && ((hdd18 > 3000) && (hdd18 <= 4000)) # Cool Humid (5A), Dry (5B)
    return 'ASHRAE 169-2006-5A' # and 'ASHRAE 169-2006-5B'

  elsif (cdd10 <= 1000) && ((hdd18 > 3000) && (hdd18 <= 4000)) # Cool  Marine (5C)
    return 'ASHRAE 169-2006-5C'

  elsif (hdd18 > 4000) && (hdd18 <= 5000) # Cold  Humid (6A), Dry (6B)
    return 'ASHRAE 169-2006-6A' # and 'ASHRAE 169-2006-6B'

  elsif (hdd18 > 5000) && (hdd18 <= 7000) # Very Cold (7)
    return 'ASHRAE 169-2006-7A'

  elsif hdd18 > 7000 # Subarctic/Arctic (8)
    return 'ASHRAE 169-2006-8A'

  else
    # raise ("invalid cdd10 of #{cdd10} or hdd18 of #{hdd18}")
    return '[INVALID]'
  end
end

#eliminate_all_radiation ⇒ String

This method will eliminate all radiation from the weather and returns self.

Returns:

Author:



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 593

def eliminate_all_radiation
  scan if @filearray.nil?
  setcolumntovalue(EXTRATERRESTRIAL_HORIZONTAL_RADIATION, '0') # not used
  setcolumntovalue(EXTRATERRESTRIAL_DIRECT_NORMAL_RADIATION, '0') # not used
  setcolumntovalue(HORIZONTAL_INFRARED_RADIATION_INTENSITY, '315')
  setcolumntovalue(GLOBAL_HORIZONTAL_RADIATION, '0') # not used
  setcolumntovalue(DIRECT_NORMAL_RADIATION, '0')
  setcolumntovalue(DIFFUSE_HORIZONTAL_RADIATION, '0')
  setcolumntovalue(TOTAL_SKY_COVER, '10') # not used
  setcolumntovalue(OPAQUE_SKY_COVER, '10') # not used
  setcolumntovalue(VISIBILITY, '0') # not used
  setcolumntovalue(CEILING_HEIGHT, '0') # not used
  # lux values
  setcolumntovalue(GLOBAL_HORIZONTAL_ILLUMINANCE, '0') # not used
  setcolumntovalue(DIRECT_NORMAL_ILLUMINANCE, '0') # not used
  setcolumntovalue(DIFFUSE_HORIZONTAL_ILLUMINANCE, '0') # not used
  setcolumntovalue(ZENITH_LUMINANCE, '0') # not used
  return self
end

#eliminate_all_radiation_except_solar ⇒ String

This method will eliminate all radiation except solar and returns self.

Returns:

Author:



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 627

def eliminate_all_radiation_except_solar
  scan if @filearray.nil?
  setcolumntovalue(EXTRATERRESTRIAL_HORIZONTAL_RADIATION, '0') # not used
  setcolumntovalue(EXTRATERRESTRIAL_DIRECT_NORMAL_RADIATION, '0') # not used
  setcolumntovalue(HORIZONTAL_INFRARED_RADIATION_INTENSITY, '315')
  setcolumntovalue(TOTAL_SKY_COVER, '10') # not used
  setcolumntovalue(OPAQUE_SKY_COVER, '10') # not used
  setcolumntovalue(VISIBILITY, '0') # not used
  setcolumntovalue(CEILING_HEIGHT, '0') # not used
  # lux values
  setcolumntovalue(GLOBAL_HORIZONTAL_ILLUMINANCE, '0') # not used
  setcolumntovalue(DIRECT_NORMAL_ILLUMINANCE, '0') # not used
  setcolumntovalue(DIFFUSE_HORIZONTAL_ILLUMINANCE, '0') # not used
  setcolumntovalue(ZENITH_LUMINANCE, '0') # not used
  return self
end

#eliminate_only_solar_radiation ⇒ String

This method will eliminate solar radiation and returns self.

Returns:

Author:



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 616

def eliminate_only_solar_radiation
  scan if @filearray.nil?
  setcolumntovalue(GLOBAL_HORIZONTAL_RADIATION, '0') # not used
  setcolumntovalue(DIRECT_NORMAL_RADIATION, '0')
  setcolumntovalue(DIFFUSE_HORIZONTAL_RADIATION, '0')
  return self
end

#eliminate_percipitation ⇒ String

This method will eliminate percipitation and returns self.

Returns:

Author:



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 647

def eliminate_percipitation
  scan if @filearray.nil?
  setcolumntovalue(PRESENT_WEATHER_OBSERVATION, '0')
  setcolumntovalue(PRESENT_WEATHER_CODES, '999999999') # no weather. Clear day.
  setcolumntovalue(SNOW_DEPTH, '0')
  setcolumntovalue(LIQUID_PRECIPITATION_DEPTH, '0')
  setcolumntovalue(LIQUID_PRECIPITATION_QUANTITY, '0')
  return self
end

#eliminate_wind ⇒ String

This method eliminates wind and returns self.

Returns:

Author:



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 660

def eliminate_wind
  scan if @filearray.nil?
  setcolumntovalue(WIND_DIRECTION, '0')
  setcolumntovalue(WIND_SPEED, '0')
  return self
end

#scan ⇒ Object

This method scans the epw file into memory.

Author:



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 569

def scan
  @filearray = []
  file = File.new(@epw_filepath, 'r')
  while (line = file.gets)
    @filearray.push(line.split(','))
  end
  file.close
end

#set_constant_dry_and_dewpoint_temperature_humidity_pressure(dbt = '0.0', dpt = '-1.1', hum = '92', press = '98500') ⇒ String

This method sets Constant Dry and Dew Point Temperature Humidity And Pressure and returns self.

Parameters:

  • dbt (Float) (defaults to: '0.0') —

    dry bulb temperature

  • dpt (Float) (defaults to: '-1.1') —

    dew point temperature

  • hum (Fixnum) (defaults to: '92') —

    humidity

  • press (Fixnum) (defaults to: '98500') —

    pressure

Returns:

Author:



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 674

def set_constant_dry_and_dewpoint_temperature_humidity_pressure(dbt = '0.0', dpt = '-1.1', hum = '92', press = '98500')
  scan if @filearray.nil?
  setcolumntovalue(DRY_BULB_TEMPERATURE, dbt)
  setcolumntovalue(DEW_POINT_TEMPERATURE, dpt)
  setcolumntovalue(RELATIVE_HUMIDITY, hum)
  setcolumntovalue(ATMOSPHERIC_STATION_PRESSURE, press)
  return self
end

#set_weather_file(model, runner = nil) ⇒ String

This method will set the weather file and returns a log string.

Parameters:

  • model (OpenStudio::model::Model) —

    A model object

Returns:

Author:



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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 529

def set_weather_file(model, runner = nil)
  BTAP.runner_register('Info', 'BTAP::Environment::WeatherFile::set_weather', runner)
  OpenStudio::Model::WeatherFile.setWeatherFile(model, @epw_file)
  building_name = model.building.get.name
  weather_file_path = model.weatherFile.get.path.get
  BTAP.runner_register('Info', "Set model \"#{building_name}\" to weather file #{weather_file_path}.\n", runner)

  # Add or update site data
  site = model.getSite
  site.setName("#{@epw_file.city}_#{@epw_file.stateProvinceRegion}_#{@epw_file.country}")
  site.setLatitude(@epw_file.latitude)
  site.setLongitude(@epw_file.longitude)
  site.setTimeZone(@epw_file.timeZone)
  site.setElevation(@epw_file.elevation)

  BTAP.runner_register('Info', 'Setting water main temperatures via parsing of STAT file.', runner)
  water_temp = model.getSiteWaterMainsTemperature
  water_temp.setAnnualAverageOutdoorAirTemperature(@stat_file.mean_dry_bulb)
  water_temp.setMaximumDifferenceInMonthlyAverageOutdoorAirTemperatures(@stat_file.delta_dry_bulb)
  BTAP.runner_register('Info', "SiteWaterMainsTemperature.AnnualAverageOutdoorAirTemperature = #{@stat_file.mean_dry_bulb}.", runner)
  BTAP.runner_register('Info', "SiteWaterMainsTemperature.MaximumDifferenceInMonthlyAverageOutdoorAirTemperatures = #{@stat_file.delta_dry_bulb}.", runner)

  # Remove all the Design Day objects that are in the file
  model.getObjectsByType('OS:SizingPeriod:DesignDay'.to_IddObjectType).each(&:remove)

  # Load in the ddy file based on convention that it is in the same directory and has the same basename as the weather
  @ddy_file.getObjectsByType('OS:SizingPeriod:DesignDay'.to_IddObjectType).each do |d|
    # grab only the ones that matter
    ddy_list = /(Htg 99.6. Condns DB)|(Clg .4. Condns WB=>MDB)|(Clg .4% Condns DB=>MWB)/
    if d.name.get =~ ddy_list
      BTAP.runner_register('Info', "Adding design day '#{d.name}'.", runner)
      # add the object to the existing model
      model.addObject(d.clone)
    end
  end
  return true
end

#setcolumntovalue(column, value) ⇒ Object

This method will sets column to a value.

Parameters:

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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 582

def setcolumntovalue(column, value)
  @filearray.each do |line|
    unless line.first =~ /\D(.*)/
      line[column] = value
    end
  end
end

#writetofile(filename) ⇒ Object

This method writes to a file.

Parameters:

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# File 'lib/openstudio-standards/weather/Weather.Model.rb', line 686

def writetofile(filename)
  scan if @filearray.nil?

  begin
    FileUtils.mkdir_p(File.dirname(filename))
    file = File.open(filename, 'w')
    @filearray.each do |line|
      firstvalue = true
      newline = ''
      line.each do |value|
        if firstvalue == true
          firstvalue = false
        else
          newline += ','
        end
        newline += value
      end
      file.puts(newline)
    end
  rescue IOError => e
    # some error occur, dir not writable etc.
  ensure
    file.close unless file.nil?
  end
  # copies original file
  FileUtils.cp(@ddy_filepath, "#{File.dirname(filename)}/#{File.basename(filename, '.epw')}.ddy")
  FileUtils.cp(@stat_filepath, "#{File.dirname(filename)}/#{File.basename(filename, '.epw')}.stat")
end