Class: IncreaseInsulationRValueForExteriorWallsByPercentage

Inherits:
OpenStudio::Ruleset::ModelUserScript
  • Object
show all
Defined in:
lib/measures/IncreaseInsulationRValueForExteriorWallsByPercentage/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/IncreaseInsulationRValueForExteriorWallsByPercentage/measure.rb', line 14

def arguments(model)
  args = OpenStudio::Ruleset::OSArgumentVector.new

  # make an argument insulation R-value
  r_value = OpenStudio::Ruleset::OSArgument.makeDoubleArgument('r_value', true)
  r_value.setDisplayName('Percentage Increase of R-value for Exterior Wall Insulation.')
  r_value.setDefaultValue(30.0)
  args << r_value

  return args
end

#name ⇒ Object

define the name that a user will see



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

def name
  return 'Increase R-value of Insulation for Exterior Walls By a Specified Percentage'
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



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

def neat_numbers(number, roundto = 2) # round to 0 or 2)
  if roundto == 2
    number = format '%.2f', number
  else
    number = 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/IncreaseInsulationRValueForExteriorWallsByPercentage/measure.rb', line 27

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

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

  # assign the user inputs to variables
  r_value = runner.getDoubleArgumentValue('r_value', user_arguments)

  # set limit for minimum insulation. This is used to limit input and for inferring insulation layer in construction.
  min_expected_r_value_ip = 1 # ip units

  # check the R-value for reasonableness
  if r_value < -100
    runner.registerError('Percentage increase less than -100% is not valid.')
    return false
  end

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

  # helper to make it easier to do unit conversions on the fly
  def unit_helper(number, from_unit_string, to_unit_string)
    converted_number = OpenStudio.convert(OpenStudio::Quantity.new(number, OpenStudio.createUnit(from_unit_string).get), OpenStudio.createUnit(to_unit_string).get).get.value
  end

  # create an array of exterior surfaces and find range of starting construction R-value (not just insulation layer)
  surfaces = model.getSurfaces
  exterior_surfaces = []
  exterior_surface_constructions = []
  exterior_surface_construction_names = []
  exterior_surface_resistance = []
  surfaces.each do |surface|
    if (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
      if !exterior_surface_construction_names.include?(exterior_surface_const.name.to_s)
        exterior_surface_constructions << exterior_surface_const.to_Construction.get
      end
      exterior_surface_construction_names << exterior_surface_const.name.to_s
      exterior_surface_resistance << 1 / exterior_surface_const.thermalConductance.to_f
    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

  # report strings for initial condition
  initial_string = []
  exterior_surface_constructions.uniq.each do |exterior_surface_construction|
    # unit conversion of exterior surface insulation from SI units (M^2*K/W) to IP units (ft^2*h*R/Btu)
    initial_conductance_ip = unit_helper(1 / exterior_surface_construction.thermalConductance.to_f, 'm^2*K/W', 'ft^2*h*R/Btu')
    initial_string << "#{exterior_surface_construction.name} (R-#{(format '%.1f', initial_conductance_ip)})"
  end
  runner.registerInitialCondition("The building had #{initial_string.size} exterior wall constructions: #{initial_string.sort.join(', ')}.")

  # hashes to track constructions and materials made by the measure, to avoid duplicates
  constructions_hash_old_new = {}
  constructions_hash_new_old = {} # used to get netArea of new construction and then cost objects of construction it replaced
  materials_hash = {}

  # array and counter for new constructions that are made, used for reporting final condition
  final_constructions_array = []

  # loop through all constructions and materials used on exterior walls, edit and clone
  exterior_surface_constructions.each do |exterior_surface_construction|
    construction_layers = exterior_surface_construction.layers
    max_thermal_resistance_material = ''
    max_thermal_resistance_material_index = ''
    counter = 0
    thermal_resistance_values = []

    # loop through construction layers and infer insulation layer/material
    construction_layers.each do |construction_layer|
      construction_layer_r_value = construction_layer.to_OpaqueMaterial.get.thermalResistance
      if !thermal_resistance_values.empty?
        if construction_layer_r_value > thermal_resistance_values.max
          max_thermal_resistance_material = construction_layer
          max_thermal_resistance_material_index = counter
        end
      end
      thermal_resistance_values << construction_layer_r_value
      counter += 1
    end

    if thermal_resistance_values.max <= unit_helper(min_expected_r_value_ip, 'ft^2*h*R/Btu', 'm^2*K/W')
      runner.registerWarning("Construction '#{exterior_surface_construction.name}' does not appear to have an insulation layer and was not altered.")
    else
      # clone the construction
      final_construction = exterior_surface_construction.clone(model)
      final_construction = final_construction.to_Construction.get
      final_construction.setName("#{exterior_surface_construction.name} adj exterior wall insulation")
      final_constructions_array << final_construction

      # add construction object if it didnt exist to start with

      # push to hashes
      constructions_hash_old_new[exterior_surface_construction.name.to_s] = final_construction
      constructions_hash_new_old[final_construction] = exterior_surface_construction # push the object to hash key vs. name

      # find already cloned insulation material and link to construction
      target_material = max_thermal_resistance_material
      found_material = false
      materials_hash.each do |orig, new|
        if target_material.name.to_s == orig
          new_material = new
          materials_hash[max_thermal_resistance_material.name.to_s] = new_material
          final_construction.eraseLayer(max_thermal_resistance_material_index)
          final_construction.insertLayer(max_thermal_resistance_material_index, new_material)
          found_material = true
        end
      end

      # clone and edit insulation material and link to construction
      if found_material == false
        new_material = max_thermal_resistance_material.clone(model)
        new_material = new_material.to_OpaqueMaterial.get
        new_material.setName("#{max_thermal_resistance_material.name}_R-value #{r_value}% increase")
        materials_hash[max_thermal_resistance_material.name.to_s] = new_material
        final_construction.eraseLayer(max_thermal_resistance_material_index)
        final_construction.insertLayer(max_thermal_resistance_material_index, new_material)
        runner.registerInfo("For construction'#{final_construction.name}', material'#{new_material.name}' was altered.")

        # edit insulation material
        new_material_matt = new_material.to_Material
        if !new_material_matt.empty?
          starting_thickness = new_material_matt.get.thickness
          target_thickness = starting_thickness * (1 + r_value / 100)
          final_thickness = new_material_matt.get.setThickness(target_thickness)
        end
        new_material_massless = new_material.to_MasslessOpaqueMaterial
        if !new_material_massless.empty?
          starting_thermal_resistance = new_material_massless.get.thermalResistance
          final_thermal_resistance = new_material_massless.get.setThermalResistance(starting_thermal_resistance * (1 + r_value / 100))
        end
        new_material_airgap = new_material.to_AirGap
        if !new_material_airgap.empty?
          starting_thermal_resistance = new_material_airgap.get.thermalResistance
          final_thermal_resistance = new_material_airgap.get.setThermalResistance(starting_thermal_resistance * (1 + r_value / 100))
        end
      end
    end
  end

  # loop through construction sets used in the model
  default_construction_sets = model.getDefaultConstructionSets
  default_construction_sets.each do |default_construction_set|
    if default_construction_set.directUseCount > 0
      default_surface_const_set = default_construction_set.defaultExteriorSurfaceConstructions
      if !default_surface_const_set.empty?
        starting_construction = default_surface_const_set.get.wallConstruction

        # creating new default construction set
        new_default_construction_set = default_construction_set.clone(model)
        new_default_construction_set = new_default_construction_set.to_DefaultConstructionSet.get
        new_default_construction_set.setName("#{default_construction_set.name} adj exterior wall insulation")

        # create new surface set and link to construction set
        new_default_surface_const_set = default_surface_const_set.get.clone(model)
        new_default_surface_const_set = new_default_surface_const_set.to_DefaultSurfaceConstructions.get
        new_default_surface_const_set.setName("#{default_surface_const_set.get.name} adj exterior wall insulation")
        new_default_construction_set.setDefaultExteriorSurfaceConstructions(new_default_surface_const_set)

        # use the hash to find the proper construction and link to new_default_surface_const_set
        target_const = new_default_surface_const_set.wallConstruction
        if !target_const.empty?
          target_const = target_const.get.name.to_s
          found_const_flag = false
          constructions_hash_old_new.each do |orig, new|
            if target_const == orig
              final_construction = new
              new_default_surface_const_set.setWallConstruction(final_construction)
              found_const_flag = true
            end
          end
          if found_const_flag == false # this should never happen but is just an extra test in case something goes wrong with the measure code
            runner.registerWarning("Measure couldn't find the construction named '#{target_const}' in the exterior surface hash.")
          end
        end

        # swap all uses of the old construction set for the new
        construction_set_sources = default_construction_set.sources
        construction_set_sources.each do |construction_set_source|
          building_source = construction_set_source.to_Building
          # if statement for each type of object than can use a DefaultConstructionSet
          if !building_source.empty?
            building_source = building_source.get
            building_source.setDefaultConstructionSet(new_default_construction_set)
          end
          building_story_source = construction_set_source.to_BuildingStory
          if !building_story_source.empty?
            building_story_source = building_story_source.get
            building_story_source.setDefaultConstructionSet(new_default_construction_set)
          end
          space_type_source = construction_set_source.to_SpaceType
          if !space_type_source.empty?
            space_type_source = space_type_source.get
            space_type_source.setDefaultConstructionSet(new_default_construction_set)
          end
          space_source = construction_set_source.to_Space
          if !space_source.empty?
            space_source = space_source.get
            space_source.setDefaultConstructionSet(new_default_construction_set)
          end
        end

      end
    end
  end

  # link cloned and edited constructions for surfaces with hard assigned constructions
  exterior_surfaces.each do |exterior_surface|
    if !exterior_surface.isConstructionDefaulted && !exterior_surface.construction.empty?

      # use the hash to find the proper construction and link to surface
      target_const = exterior_surface.construction
      if !target_const.empty?
        target_const = target_const.get.name.to_s
        constructions_hash_old_new.each do |orig, new|
          if target_const == orig
            final_construction = new
            exterior_surface.setConstruction(final_construction)
          end
        end
      end

    end
  end

  # report strings for final condition
  final_string = [] # not all exterior surface constructions, but only new ones made. If exterior surface didn't have insulation and was not altered we don't want to show it
  affected_area_si = 0
  final_constructions_array.each do |final_construction|
    # unit conversion of exterior surface insulation from SI units (M^2*K/W) to IP units (ft^2*h*R/Btu)
    final_conductance_ip = unit_helper(1 / final_construction.thermalConductance.to_f, 'm^2*K/W', 'ft^2*h*R/Btu')
    final_string << "#{final_construction.name} (R-#{(format '%.1f', final_conductance_ip)})"
    affected_area_si += final_construction.getNetArea
  end

  # add not applicable test if there were exterior surface constructions but none of them were altered (already enough insulation or doesn't look like insulated wall)
  if affected_area_si == 0
    runner.registerAsNotApplicable('No exterior walls were altered.')
    return true
    # affected_area_ip = affected_area_si
  else
    # ip construction area for reporting
    affected_area_ip = unit_helper(affected_area_si, 'm^2', 'ft^2')
  end

  # report final condition
  runner.registerFinalCondition("The existing insulation for exterior walls was increased by #{r_value}%. This was applied to #{neat_numbers(affected_area_ip, 0)} (ft^2) across #{final_string.size} exterior wall constructions: #{final_string.sort.join(', ')}.")

  return 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/IncreaseInsulationRValueForExteriorWallsByPercentage/measure.rb', line 59

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