Module: BrighterPlanet::RailTrip::CarbonModel
- Defined in:
- lib/rail_trip/carbon_model.rb
Class Method Summary collapse
Class Method Details
.included(base) ⇒ Object
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# File 'lib/rail_trip/carbon_model.rb', line 25 def self.included(base) base.decide :emission, :with => :characteristics do ### Emission calculation # Returns the `emission` estimate (*kg CO<sub>2</sub>e*). committee :emission do #### From fuel and passengers # **Complies:** GHG Protocol, ISO-140641, Climate Registry Protocol # # - Checks whether the trip occurred during the `timeframe` # - Multiplies `diesel use` (*l diesel*) by the `diesel emission factor` (*kg CO<sub>2</sub>e / l diesel*) to give diesel emissions (*kg CO<sub>2</sub>e*) # - Multiplies `electricity use` (*kWh*) by the `electricity emission factor` (*kg CO<sub>2</sub>e / kWh electricity*) to give electricity emissions (*kg CO<sub>2</sub>e*) # - Adds diesel and electricity emissions to give total emissions (*kg CO<sub>2</sub>e*) # - Divides by passengers to give emissions per passenger (*kg CO<sub>2</sub>e*) # - If the trip did not occur during the `timeframe`, `emission` is zero quorum 'from date, fuel, emission factors, and passengers', :needs => [:diesel_consumed, :diesel_emission_factor, :electricity_consumed, :electricity_emission_factor, :passengers, :date] do |characteristics, timeframe| date = characteristics[:date].is_a?(Date) ? characteristics[:date] : Date.parse(characteristics[:date].to_s) if timeframe.include? date (characteristics[:diesel_consumed] * characteristics[:diesel_emission_factor] + characteristics[:electricity_consumed] * characteristics[:electricity_emission_factor]) / characteristics[:passengers] else 0 end end end ### Diesel emission factor calculation # Returns the `diesel emission factor` (*kg CO<sub>2</sub>e / l*). committee :diesel_emission_factor do #### Default diesel emission factor # **Complies:** GHG Protocol, ISO 14064-1, Climate Registry Protocol # # Looks up [Distillate Fuel Oil 2](http://data.brighterplanet.com/fuel_types)'s `emission factor` (*kg CO<sub>2</sub>e / l*). quorum 'default' do diesel = FuelType.find_by_name "Distillate Fuel Oil 2" diesel.emission_factor end end ### Electricity emission factor calculation # Returns the `electricity emission factor` (*kg CO<sub>2</sub>e / kWh*). committee :electricity_emission_factor do #### Default electricity emission factor # **Complies:** GHG Protocol, ISO 14064-1, Climate Registry Protocol # # - Looks up the [U.S. Average](http://data.brighterplanet.com/egrid_subregions) `electricity emission factor` (*kg CO<sub>2</sub>e / l*) # - Looks up the [U.S. Average](http://data.brighterplanet.com/egrid_regions) grid region `loss factor` # - Divides the `electricity emission factor` by (1 - `loss factor`) to account for transmission and distribution losses quorum 'default' do subregion = EgridSubregion.find_by_abbreviation "US" region = subregion.egrid_region emission_factor = subregion.electricity_emission_factor / (1 - region.loss_factor) emission_factor end end ### Diesel consumed calculation # Returns the `diesel use` (*l*). committee :diesel_consumed do #### From distance and diesel intensity # **Complies:** GHG Protocol, ISO-140641, Climate Registry Protocol # # Multiplies `distance` (*km*) by `diesel intensity` (*l / km*) to give *l*. quorum 'from distance and diesel intensity', :needs => [:distance, :diesel_intensity] do |characteristics| characteristics[:distance] * characteristics[:diesel_intensity] end end ### Electricity consumed calculation # Returns the `electricity use` (*kWh*). committee :electricity_consumed do #### From distance and electricity intensity # **Complies:** GHG Protocol, ISO-140641, Climate Registry Protocol # # Multiplies `distance` (*km*) by `electricity intensity` (*kWh / km*) to give *kWh*. quorum 'from distance and electricity intensity', :needs => [:distance, :electricity_intensity] do |characteristics| characteristics[:distance] * characteristics[:electricity_intensity] end end ### Distance calculation # Returns the `distance` traveled (*km*). committee :distance do #### Distance from client input # **Complies:** All # # Uses the client-input `distance` (*km*). #### Distance from duration and speed # **Complies:** GHG Protocol, ISO-140641, Climate Registry Protocol # # Multiplies the `duration` (*hours*) by the `speed` (*km / hour*) to give *km*. quorum 'from duration and speed', :needs => [:duration, :speed] do |characteristics| characteristics[:duration] * characteristics[:speed] end #### Distance from rail class # **Complies:** GHG Protocol, ISO-140641, Climate Registry Protocol # # Looks up the [rail class](http://data.brighterplanet.com/rail_classes) `distance`. quorum 'from rail class', :needs => :rail_class do |characteristics| characteristics[:rail_class].distance end end ### Duration calculation # Returns the trip's `duration` (*hours*). #### Duration from client input # **Complies:** All # # Uses the client-input `duration` (*hours*). ### Diesel intensity calculation # Returns the `diesel intensity` (*l / km*). committee :diesel_intensity do #### Diesel intensity from rail class # **Complies:** GHG Protocol, ISO-140641, Climate Registry Protocol # # Looks up the [rail class](http://data.brighterplanet.com/rail_classes) `diesel intensity`. quorum 'from rail class', :needs => :rail_class do |characteristics| characteristics[:rail_class].diesel_intensity end end ### Electricity intensity calculation # Returns the `electricity intensity` (*kWh / km*). committee :electricity_intensity do #### Electricity intensity from rail class # **Complies:** GHG Protocol, ISO-140641, Climate Registry Protocol # # Looks up the [rail class](http://data.brighterplanet.com/rail_classes) `electricity intensity`. quorum 'from rail class', :needs => :rail_class do |characteristics| characteristics[:rail_class].electricity_intensity end end ### Speed calculation # Returns the average `speed` (*km / hour*). committee :speed do #### Speed from rail class # **Complies:** GHG Protocol, ISO-140641, Climate Registry Protocol # # Looks up the [rail class](http://data.brighterplanet.com/rail_classes) `speed`. quorum 'from rail class', :needs => :rail_class, :complies => [:ghg_protocol, :iso, :tcr] do |characteristics| characteristics[:rail_class].speed end end ### Passengers calculation # Returns the total number of `passengers`. committee :passengers do #### Passengers from rail class # **Complies:** GHG Protocol, ISO-140641, Climate Registry Protocol # # Looks up the [rail class](http://data.brighterplanet.com/rail_classes) `passengers`. quorum 'from rail class', :needs => :rail_class, :complies => [:ghg_protocol, :iso, :tcr] do |characteristics| characteristics[:rail_class].passengers end end ### Rail class calculation # Returns the [rail class](http://data.brighterplanet.com/rail_classes). # This is the type of rail the trip used. committee :rail_class do #### Rail class from client input # **Complies:** All # # Uses the client-input [rail class](http://data.brighterplanet.com/rail_classes). #### Default rail class # **Complies:** GHG Protocol, ISO 14064-1, Climate Registry Protocol # # Uses an artificial [rail class](http://data.brighterplanet.com/rail_classes) representing the U.S. average. quorum 'default', :complies => [:ghg_protocol, :iso, :tcr] do RailClass.find_by_name "US average" end end ### Date calculation # Returns the `date` on which the trip occurred. committee :date do #### Date from client input # **Complies:** All # # Uses the client-input `date`. #### Date from timeframe # **Complies:** GHG Protocol, ISO-14064-1, Climate Registry Protocol # # Assumes the trip occurred on the first day of the `timeframe`. quorum 'from timeframe', :complies => [:ghg_protocol, :iso, :tcr] do |characteristics, timeframe| timeframe.from end end ### Timeframe calculation # Returns the `timeframe`. # This is the period during which to calculate emissions. #### Timeframe from client input # **Complies:** All # # Uses the client-input `timeframe`. #### Default timeframe # **Complies:** All # # Uses the current calendar year. end end |