Module: BrighterPlanet::BusTrip::CarbonModel

Defined in:
lib/bus_trip/carbon_model.rb

Class Method Summary collapse

Class Method Details

.included(base) ⇒ Object 



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# File 'lib/bus_trip/carbon_model.rb', line 4

def self.included(base)
  base.extend FastTimestamp
  base.decide :emission, :with => :characteristics do
    committee :emission do # returns kg CO2
      quorum 'from fuel and passengers', :needs => [:diesel_consumed, :gasoline_consumed, :alternative_fuels_consumed, :passengers, :distance, :bus_class] do |characteristics|
        #((       litres diesel         ) * (  kilograms CO2 / litre diesel   ) + (       litres gasoline          ) * (     kilograms CO2 / kWh            ) + (     litre-equivs alternative fuel       ) * (kilograms CO2 / litre-equiv alternative fuel))
        (characteristics[:diesel_consumed] * research(:diesel_emission_factor) + characteristics[:gasoline_consumed] * research(:gasoline_emission_factor) + characteristics[:alternative_fuels_consumed] * research(:alternative_fuels_emission_factor) + characteristics[:distance] * characteristics[:bus_class].fugitive_air_conditioning_emission) / characteristics[:passengers]
      end
    end
    
    committee :diesel_consumed do # returns litres diesel
      quorum 'from distance and diesel intensity', :needs => [:distance, :diesel_intensity] do |characteristics|
        #(          kilometres        ) * (     litres diesel / kilometre      )
        characteristics[:distance] * characteristics[:diesel_intensity]
      end
    end
    
    committee :gasoline_consumed do # returns litres gasoline
      quorum 'from distance and gasoline intensity', :needs => [:distance, :gasoline_intensity] do |characteristics|
        #(          kilometres        ) * (     litres gasoline / kilometre      )
        characteristics[:distance] * characteristics[:gasoline_intensity]
      end
    end
    
    committee :alternative_fuels_consumed do # returns litres alternative_fuels
      quorum 'from distance and alternative fuels intensity', :needs => [:distance, :alternative_fuels_intensity] do |characteristics|
        #(          kilometres        ) * (     litres alternative_fuels / kilometre      )
        characteristics[:distance] * characteristics[:alternative_fuels_intensity]
      end
    end
    
    committee :distance do # returns kilometres
      quorum 'from distance estimate', :needs => :distance_estimate do |characteristics|
        characteristics[:distance_estimate]
      end
      
      quorum 'from duration', :needs => [:duration, :speed] do |characteristics|
        #(       minutes         ) * (        kph          )
        characteristics[:duration] * characteristics[:speed] / 60
      end
      
      quorum 'from bus class', :needs => :bus_class do |characteristics|
        characteristics[:bus_class].distance
      end
    end
    
    committee :diesel_intensity do # returns litres diesel / vehicle kilometre
      quorum 'from bus class', :needs => :bus_class do |characteristics|
        characteristics[:bus_class].diesel_intensity
      end
    end
    
    committee :gasoline_intensity do # returns litres gasoline / vehicle kilometre
      quorum 'from bus class', :needs => :bus_class do |characteristics|
        characteristics[:bus_class].gasoline_intensity
      end
    end
    
    committee :alternative_fuels_intensity do # returns litres alternative_fuels / vehicle kilometre
      quorum 'from bus class', :needs => :bus_class do |characteristics|
        characteristics[:bus_class].alternative_fuels_intensity
      end
    end
    
    committee :speed do # returns kph
      quorum 'from bus class', :needs => :bus_class do |characteristics|
        characteristics[:bus_class].speed
      end
    end
    
    committee :passengers do
      quorum 'from bus class', :needs => :bus_class do |characteristics|
        characteristics[:bus_class].passengers
      end
    end
    
    committee :bus_class do
      quorum 'default' do
        BusClass.fallback
      end
    end
  end
end

.research(key) ⇒ Object 



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# File 'lib/bus_trip/carbon_model.rb', line 88

def self.research(key)
  case key
  when :diesel_emission_factor
    22.450.pounds_per_gallon.to(:kilograms_per_litre) # CO2 / diesel  https://brighterplanet.sifterapp.com/projects/30/issues/454
  when :gasoline_emission_factor
    23.681.pounds_per_gallon.to(:kilograms_per_litre) # CO2 / gasoline  https://brighterplanet.sifterapp.com/projects/30/issues/454
  when :alternative_fuels_emission_factor
    9.742.pounds_per_gallon.to(:kilograms_per_litre) # CO2 / equiv alternative fuels  https://brighterplanet.sifterapp.com/projects/30/issues/454
  end
end