Class: ExteriorWallThermalPropertiesMultiplier

Inherits:
OpenStudio::Measure::ModelMeasure
  • Object
show all
Defined in:
lib/measures/ExteriorWallThermalPropertiesMultiplier/measure.rb

Overview

start the measure

Instance Method Summary collapse

Instance Method Details

#arguments(_model) ⇒ Object

define the arguments that the user will input



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# File 'lib/measures/ExteriorWallThermalPropertiesMultiplier/measure.rb', line 48

def arguments(_model)
  args = OpenStudio::Measure::OSArgumentVector.new

  # make an argument insulation R-value
  r_value_mult = OpenStudio::Measure::OSArgument.makeDoubleArgument('r_value_mult', true)
  r_value_mult.setDisplayName('Exterior wall total R-value multiplier')
  r_value_mult.setDefaultValue(1)
  args << r_value_mult

  solar_abs_mult = OpenStudio::Measure::OSArgument.makeDoubleArgument('solar_abs_mult', true)
  solar_abs_mult.setDisplayName('Exterior wall solar absorptance multiplier')
  solar_abs_mult.setDefaultValue(1)
  args << solar_abs_mult

  thermal_mass_mult = OpenStudio::Measure::OSArgument.makeDoubleArgument('thermal_mass_mult', true)
  thermal_mass_mult.setDisplayName('Exterior wall thermal mass multiplier')
  thermal_mass_mult.setDefaultValue(1)
  args << thermal_mass_mult

  args
end

#check_multiplier(runner, multiplier) ⇒ Object 



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# File 'lib/measures/ExteriorWallThermalPropertiesMultiplier/measure.rb', line 40

def check_multiplier(runner, multiplier)
  if multiplier < 0
    runner.registerError("Multiplier #{multiplier} cannot be negative.")
    false
  end
end

#description ⇒ Object

human readable description



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# File 'lib/measures/ExteriorWallThermalPropertiesMultiplier/measure.rb', line 14

def description
  'Change exterior walls by altering the thermal resistance, density, and solar absorptance of the wall constructions by a Multiplier'
end

#modeler_description ⇒ Object

human readable description of modeling approach



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# File 'lib/measures/ExteriorWallThermalPropertiesMultiplier/measure.rb', line 19

def modeler_description
  'Change exterior walls by altering the thermal resistance, density, and solar absorptance of the wall constructions by a Multiplier'
end

#name ⇒ Object

define the name that a user will see



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# File 'lib/measures/ExteriorWallThermalPropertiesMultiplier/measure.rb', line 9

def name
  'Exterior Wall Thermal Properties Multiplier'
end

#neat_numbers(number, roundto = 2) ⇒ Object

short def to make numbers pretty (converts 4125001.25641 to 4,125,001.26 or 4,125,001). The definition be called through this measure round to 0 or 2)



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# File 'lib/measures/ExteriorWallThermalPropertiesMultiplier/measure.rb', line 25

def neat_numbers(number, roundto = 2)
  number = if roundto == 2
             format '%.2f', number
           else
             number.round
           end
  # regex to add commas
  number.to_s.reverse.gsub(/([0-9]{3}(?=([0-9])))/, '\\1,').reverse
end

#run(model, runner, user_arguments) ⇒ Object

define what happens when the measure is run



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# File 'lib/measures/ExteriorWallThermalPropertiesMultiplier/measure.rb', line 71

def run(model, runner, user_arguments)
  super(model, runner, user_arguments)

  # use the built-in error checking
  unless runner.validateUserArguments(arguments(model), user_arguments)
    return false
  end

  # assign the user inputs to variables
  r_value_mult = runner.getDoubleArgumentValue('r_value_mult', user_arguments)
  check_multiplier(runner, r_value_mult)
  solar_abs_mult = runner.getDoubleArgumentValue('solar_abs_mult', user_arguments)
  check_multiplier(runner, solar_abs_mult)
  thermal_mass_mult = runner.getDoubleArgumentValue('thermal_mass_mult', user_arguments)
  check_multiplier(runner, thermal_mass_mult)

  # create an array of exterior surfaces and construction types
  surfaces = model.getSurfaces
  exterior_surfaces = []
  exterior_surface_constructions = []
  surfaces.each do |surface|
    next unless surface.outsideBoundaryCondition == 'Outdoors' && surface.surfaceType == 'Wall'

    exterior_surfaces << surface
    exterior_surface_const = surface.construction.get
    # only add construction if it hasn't been added yet
    unless exterior_surface_constructions.include?(exterior_surface_const)
      exterior_surface_constructions << exterior_surface_const.to_Construction.get
    end
  end

  # nothing will be done if there are no exterior surfaces
  if exterior_surfaces.empty?
    runner.registerAsNotApplicable('Model does not have any exterior walls.')
    return true
  end

  # get initial number of surfaces having each construction type
  initial_condition_string = 'Initial number of surfaces of each construction type: '
  exterior_surface_construction_numbers = []
  exterior_surface_constructions.each_with_index do |construction, index|
    exterior_surface_construction_numbers[index] = 0
    initial_condition_string << "'#{construction.name}': "
    exterior_surfaces.each do |surface|
      exterior_surface_construction_numbers[index] += 1 if surface.construction.get.handle.to_s == construction.handle.to_s
    end
    initial_condition_string << "#{exterior_surface_construction_numbers[index]}, "
  end

  runner.registerInitialCondition(initial_condition_string)

  # get initial sets of construction layers and desired values
  initial_layers = []
  initial_r_val = []
  initial_sol_abs = []
  initial_thm_mass = []
  initial_r_val_d = []
  initial_sol_abs_d = []
  initial_thm_mass_d = []
  exterior_surface_constructions.each_with_index do |_construction, con_index|
    initial_layers[con_index] = exterior_surface_constructions[con_index].layers
    initial_sol_abs[con_index] = initial_layers[con_index][0].to_StandardOpaqueMaterial.get.solarAbsorptance
    initial_r_val[con_index] = []
    initial_thm_mass[con_index] = []
    initial_sol_abs_d[con_index] = neat_numbers(initial_layers[con_index][0].to_StandardOpaqueMaterial.get.solarAbsorptance)
    initial_r_val_d[con_index] = []
    initial_thm_mass_d[con_index] = []
    initial_layers[con_index].each_with_index do |layer, lay_index|
      initial_r_val[con_index][lay_index] = initial_layers[con_index][lay_index].to_OpaqueMaterial.get.thermalResistance
      initial_thm_mass[con_index][lay_index] = initial_layers[con_index][lay_index].to_StandardOpaqueMaterial.get.density if layer.to_StandardOpaqueMaterial.is_initialized
      initial_r_val_d[con_index][lay_index] = neat_numbers(initial_layers[con_index][lay_index].to_OpaqueMaterial.get.thermalResistance) if layer.to_OpaqueMaterial.is_initialized
      initial_thm_mass_d[con_index][lay_index] = neat_numbers(initial_layers[con_index][lay_index].to_StandardOpaqueMaterial.get.density) if layer.to_StandardOpaqueMaterial.is_initialized
    end
  end
  initial_r_val_units = 'm^2*K/W'
  initial_thm_mass_units = 'kg/m3'

  # calculate desired values for each construction and layer
  desired_r_val = []
  desired_sol_abs = []
  desired_thm_mass = []
  initial_r_val.each_index do |index1|
    desired_r_val[index1] = []
    initial_r_val[index1].each_index do |index2|
      desired_r_val[index1][index2] = initial_r_val[index1][index2] * r_value_mult if initial_r_val[index1][index2]
    end
  end
  initial_sol_abs.each_index do |index1|
    next unless initial_sol_abs[index1]

    desired_sol_abs[index1] = initial_sol_abs[index1] * solar_abs_mult
    if desired_sol_abs[index1] > 1
      desired_sol_abs[index1] = 1
      runner.registerWarning("Initial solar absorptance of '#{initial_layers[index1][0].name}' was #{initial_sol_abs[index1]}. Multiplying it by #{solar_abs_mult} results in a number greater than 1, which is outside the allowed range. The value is instead being set to #{desired_sol_abs[index1]}")
    elsif desired_sol_abs[index1] < 0
      desired_sol_abs[index1] = 0
      runner.registerWarning("Initial solar absorptance of '#{initial_layers[index1][0].name}' was #{initial_sol_abs[index1]}. Multiplying it by #{solar_abs_mult} results in a number less than 0, which is outside the allowed range. The value is instead being set to #{desired_sol_abs[index1]}")
    end
  end
  initial_thm_mass.each_index do |index1|
    desired_thm_mass[index1] = []
    initial_thm_mass[index1].each_index do |index2|
      desired_thm_mass[index1][index2] = initial_thm_mass[index1][index2] * thermal_mass_mult if initial_thm_mass[index1][index2]
    end
  end

  # initalize final values arrays
  final_construction = []
  final_r_val = []
  final_sol_abs = []
  final_thm_mass = []
  final_r_val_d = []
  final_sol_abs_d = []
  final_thm_mass_d = []
  initial_r_val.each_with_index { |_, index| final_r_val[index] = [] }
  initial_thm_mass.each_with_index { |_, index| final_thm_mass[index] = [] }
  initial_r_val_d.each_with_index { |_, index| final_r_val_d[index] = [] }
  initial_thm_mass_d.each_with_index { |_, index| final_thm_mass_d[index] = [] }

  # replace exterior surface wall constructions
  exterior_surface_constructions.each_with_index do |construction, con_index|
    # create and name new construction
    new_construction = construction.clone
    new_construction = new_construction.to_Construction.get
    new_construction.setName("#{construction.name} (R #{r_value_mult.round(1)}x Solar #{solar_abs_mult.round(1)}x Therm #{thermal_mass_mult.round(1)}x)")
    # replace layers in new construction
    new_construction.layers.each_with_index do |layer, lay_index|
      new_layer = layer.clone
      new_layer = new_layer.to_Material.get
      # update thermal properties for the layer based on desired arrays
      new_layer.to_StandardOpaqueMaterial.get.setSolarAbsorptance(desired_sol_abs[con_index]) if lay_index == 0 && layer.to_StandardOpaqueMaterial.is_initialized # only apply to outer surface
      new_layer.to_OpaqueMaterial.get.setThermalResistance(desired_r_val[con_index][lay_index]) if layer.to_OpaqueMaterial.is_initialized
      new_layer.to_StandardOpaqueMaterial.get.setDensity(desired_thm_mass[con_index][lay_index]) if layer.to_StandardOpaqueMaterial.is_initialized && desired_thm_mass[con_index][lay_index] != 0
      new_layer.setName("#{layer.name} (R #{r_value_mult.round(1)}x Solar #{solar_abs_mult.round(1)}x Therm #{thermal_mass_mult.round(1)}x)")
      new_construction.setLayer(lay_index, new_layer)
      # calculate properties of new layer and output nice names
      final_r_val[con_index][lay_index] = new_construction.layers[lay_index].to_OpaqueMaterial.get.thermalResistance if layer.to_OpaqueMaterial.is_initialized
      final_sol_abs[con_index] = new_construction.layers[lay_index].to_StandardOpaqueMaterial.get.solarAbsorptance if lay_index == 0 && layer.to_StandardOpaqueMaterial.is_initialized
      final_thm_mass[con_index][lay_index] = new_construction.layers[lay_index].to_StandardOpaqueMaterial.get.density if layer.to_StandardOpaqueMaterial.is_initialized
      final_r_val_d[con_index][lay_index] = neat_numbers(final_r_val[con_index][lay_index])
      final_sol_abs_d[con_index] = neat_numbers(final_sol_abs[con_index]) if lay_index == 0 && layer.to_StandardOpaqueMaterial.is_initialized
      final_thm_mass_d[con_index][lay_index] = neat_numbers(final_thm_mass[con_index][lay_index]) if layer.to_StandardOpaqueMaterial.is_initialized
      runner.registerInfo("Updated material '#{layer.name}' in construction '#{new_construction.name}' to '#{new_layer.name}' as follows:")
      final_r_val[con_index][lay_index] ? runner.registerInfo("R-Value updated from #{initial_r_val_d[con_index][lay_index]} to #{final_r_val_d[con_index][lay_index]} (#{(final_r_val[con_index][lay_index] / initial_r_val[con_index][lay_index]).round(2)} mult)") : runner.registerInfo("R-Value was #{initial_r_val_d[con_index][lay_index]} and now is nil_value")
      final_thm_mass[con_index][lay_index] ? runner.registerInfo("Thermal Mass updated from #{initial_thm_mass_d[con_index][lay_index]} to #{final_thm_mass_d[con_index][lay_index]} (#{(final_thm_mass[con_index][lay_index] / initial_thm_mass[con_index][lay_index]).round(2)} mult)") : runner.registerInfo("Thermal Mass was #{initial_thm_mass[con_index][lay_index]} and now is nil_value")
      if lay_index == 0
        final_sol_abs[con_index] ? runner.registerInfo("Solar Absorptance updated from #{initial_sol_abs_d[con_index]} to #{final_sol_abs_d[con_index]} (#{(final_sol_abs[con_index] / initial_sol_abs[con_index]).round(2)} mult)") : runner.registerInfo("Solar Absorptance was #{initial_sol_abs[con_index][lay_index]} and now is nil_value")
      end
    end
    final_construction[con_index] = new_construction
    # update surfaces with construction = construction to new_construction
    exterior_surfaces.each do |surface|
      surface.setConstruction(new_construction) if surface.construction.get.handle.to_s == construction.handle.to_s
    end
    runner.registerInfo("Using New Construction #{new_construction.name}")
  end

  # report desired condition
  runner.registerFinalCondition("Applied R #{r_value_mult.round(1)}x Solar #{solar_abs_mult.round(1)}x Therm #{thermal_mass_mult.round(1)}x change")

  true
end

#unit_helper(number, from_unit_string, to_unit_string) ⇒ Object

helper to make it easier to do unit conversions on the fly



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# File 'lib/measures/ExteriorWallThermalPropertiesMultiplier/measure.rb', line 36

def unit_helper(number, from_unit_string, to_unit_string)
  OpenStudio.convert(OpenStudio::Quantity.new(number, OpenStudio.createUnit(from_unit_string).get), OpenStudio.createUnit(to_unit_string).get).get.value
end