Class: BTAPCarbon

Inherits:
Object
  • Object
show all
Defined in:
lib/openstudio-standards/btap/carbon/btap_carbon.rb

Instance Method Summary collapse

Constructor Details

#initialize(attributes:, standards_data:) ⇒ BTAPCarbon

Returns a new instance of BTAPCarbon.



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# File 'lib/openstudio-standards/btap/carbon/btap_carbon.rb', line 2

def initialize(attributes:, standards_data:)
  @carbon_database  = {}
  @costing_database = CostingDatabase.instance
  @cp               = CommonPaths.instance
  @attributes       = attributes
  @carbon_report    = {}
  @frame_m_to_kg    = standards_data["constants"]["glazing_frame_m_to_kg"]

  # Build the carbon database.
  carbon_opaque = CSV.read(@cp.carbon_opaque_path)
  @carbon_database["opaque"] = Array.new

  1.upto carbon_opaque.length - 1 do |i|
    row   = carbon_opaque[i]
    index = row.each
    item  = Hash.new

    item["materials_opaque_id"]                     = index.next
    item["description"]                             = index.next
    item["type"]                                    = index.next
    item["quantity"]                                = index.next.to_f
    item["per m2"]                                  = index.next.to_f
    item["Product Category"]                        = index.next
    item["Embodied Carbon (A1-A5)"]                 = index.next.to_f
    item["Embodied Carbon (A-C)"]                   = index.next.to_f
    item["Environmental Product Declaration (EPD)"] = index.next

    @carbon_database["opaque"] << item
  end

  carbon_glazing = CSV.read(@cp.carbon_glazing_path)
  @carbon_database["glazing"] = Array.new

  1.upto carbon_glazing.length - 1 do |i|
    row   = carbon_glazing[i]
    index = row.each
    item  = Hash.new

    item["materials_glazing_id"]    = index.next
    item["description"]             = index.next
    item["per m2"]                  = index.next.to_f
    item["Embodied Carbon (A1-A5)"] = index.next.to_f
    item["Embodied Carbon (A-C)"]   = index.next.to_f
    item["Environmental Product Declaration (EPD)"] = index.next

    @carbon_database["glazing"] << item
  end

  carbon_frame = CSV.read(@cp.carbon_frame_path)
  @carbon_database["frame"] = Array.new

  1.upto carbon_frame.length - 1 do |i|
    row   = carbon_frame[i]
    index = row.each
    item  = Hash.new

    item["materials_glazing_id"]    = index.next
    item["description"]             = index.next
    item["per m2"]                  = index.next.to_f
    item["Embodied Carbon (A1-A5)"] = index.next.to_f
    item["Embodied Carbon (A-C)"]   = index.next.to_f
    item["Environmental Product Declaration (EPD)"] = index.next

    @carbon_database["frame"] << item
  end
end

Instance Method Details

#audit_embodied_carbon ⇒ Object 



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# File 'lib/openstudio-standards/btap/carbon/btap_carbon.rb', line 69

def audit_embodied_carbon
  @attributes.surface_types.each do |surface_type|
    @carbon_report["#{surface_type.underscore}_area_m2"] = 0.0
    @carbon_report["#{surface_type.underscore}_carbon"]  = 0.0
  end

  @attributes.spaces.each do |space|
    @attributes.surface_types.each do |surface_type|
      space.surfaces_hash[surface_type].each do |surface|
        surface_area = surface.netArea * space.thermalZone.get.multiplier
        @carbon_report["#{surface_type.underscore}_area_m2"] = \
          (@carbon_report["#{surface_type.underscore}_area_m2"] + surface_area).round(2)

        # Get the carbon emissions for each material in the space.
        if surface.construction_hash.nil?
          emissions = 0.0
        else
          emissions = get_carbon_emissions(surface.construction_hash, surface, surface_area) 
          construction = surface.construction_hash
        end

        # Calculate the carbon emissions
        @carbon_report["#{surface_type.underscore}_carbon"] = \
          (@carbon_report["#{surface_type.underscore}_carbon"] + emissions).round(2)
      end
    end
  end

  # Get the total emissions from all the surface types.
  total_emissions = 0
  @attributes.surface_types.each do |surface_type|
    total_emissions += @carbon_report["#{surface_type.underscore}_carbon"]
  end

  @carbon_report["total"] = total_emissions
  return @carbon_report
end

#get_carbon_emissions(construction, surface, surface_area) ⇒ Object

Retrieve the carbon emissions given a surface, its construction, and its area.



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# File 'lib/openstudio-standards/btap/carbon/btap_carbon.rb', line 108

def get_carbon_emissions(construction, surface, surface_area)
  total_emissions  = 0.0
  materials_file   = "materials_#{construction["type"]}"
  id_column        = materials_file + "_id"
  id_layers_column = "material_#{construction["type"]}_id_layers"

  construction[id_layers_column].split(',').each do |material_id|

    # Locate the material entry in the carbon database
    material_carbon = @carbon_database[construction["type"]].find { |row| 
      row[id_column] == material_id }["Embodied Carbon (A-C)"]

    if material_carbon.nil?
      raise("Error: Could not find material with ID #{material_id} in the carbon database.")
    end

    # If the material is glazing, the frame must be calculated by retrieving the perimeter of the window
    # and converting according to the correct attributes of the window.
    if construction["type"] == "glazing"
      fenestration_type = construction["fenestration_type"]

      # Skip skylights and doors since we don't have the data for them.
      # Only consider fixed and operable windows.
      if fenestration_type != "FixedWindow" and fenestration_type != "OperableWindow"
        puts "Fenestration type #{fenestration_type} is not defined for carbon calculation, skipping this component."
        next
      end

      material_frame = @carbon_database["frame"].find { |row|
        row[id_column] == material_id }["Embodied Carbon (A-C)"]

      # Get the materials_glazing entry from the costing database to access the number of panes the window has.
      material_costing = @costing_database["raw"][materials_file].find { |row| row[id_column] == material_id }

      if material_costing.nil?
        raise("Error: Could not find material with ID #{material_id} in the costing database.")
      end

      fenestration_number_of_panes = material_costing["fenestration_number_of_panes"]

      # Try to get the correct frame material. 
      frame_material = nil
      construction_component   = construction["component"].downcase
      construction_description = construction["description"].downcase
      ["vinyl-wood", "plastic", "aluminum"].each do |material|
        if material in construction_component
          frame_material = material
          break
        elsif material in construction_description
          frame_material = material
          break
        end
      end

      if frame_material.nil?
        raise("Error: Could not find frame material for glazing ID #{material_id} in constructions_glazing.csv.")
      end

      # Get the conversion factor for the window frame and add it to the total emissions.
      conversion_factor = @frame_m_to_kg[frame_material][fenestration_type][fenestration_number_of_panes] 
      perimeter = BTAP::Geometry::Surfaces.getSurfacePerimeterFromVertices(vertices: surface.vertices)
      total_emissions += material_frame * perimeter * conversion_factor
    end

    total_emissions += material_carbon * surface_area
  end

  return total_emissions
end