Class: AutomobileFuel

Inherits:
ActiveRecord::Base
  • Object
show all
Defined in:
lib/earth/automobile/automobile_fuel.rb

Constant Summary collapse

CODES = 
{
  :electricity => 'El',
  :diesel => 'D'
}

Class Method Summary collapse

Class Method Details

.fallback_annual_distance ⇒ Object 



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# File 'lib/earth/automobile/automobile_fuel.rb', line 19

def fallback_annual_distance
  fallback_latest_type_fuel_year_ages.weighted_average(:annual_distance, :weighted_by => :vehicles)
end

.fallback_annual_distance_units ⇒ Object 



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# File 'lib/earth/automobile/automobile_fuel.rb', line 23

def fallback_annual_distance_units
  fallback_latest_type_fuel_year_ages.first.annual_distance_units
end

.fallback_blend_portion ⇒ Object 



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# File 'lib/earth/automobile/automobile_fuel.rb', line 27

def fallback_blend_portion
  latest_year = AutomobileTypeFuelYear.maximum('year')
  gas_use = AutomobileTypeFuelYear.where(:year => latest_year, :fuel_common_name => 'gasoline').sum('fuel_consumption')
  diesel_use = AutomobileTypeFuelYear.where(:year => latest_year, :fuel_common_name => 'diesel').sum('fuel_consumption')
  diesel_use / (gas_use + diesel_use)
end

.fallback_ch4_emission_factor ⇒ Object 



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# File 'lib/earth/automobile/automobile_fuel.rb', line 65

def fallback_ch4_emission_factor
  fallback_latest_type_fuel_years.weighted_average(:ch4_emission_factor, :weighted_by => :total_travel) * GreenhouseGas[:ch4].global_warming_potential
end

.fallback_ch4_emission_factor_units ⇒ Object 



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# File 'lib/earth/automobile/automobile_fuel.rb', line 69

def fallback_ch4_emission_factor_units
  prefix = fallback_latest_type_fuel_years.first.ch4_emission_factor_units.split("_per_")[0]
  suffix = fallback_latest_type_fuel_years.first.ch4_emission_factor_units.split("_per_")[1]
  prefix + "_co2e_per_" + suffix
end

.fallback_co2_biogenic_emission_factor ⇒ Object 



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# File 'lib/earth/automobile/automobile_fuel.rb', line 52

def fallback_co2_biogenic_emission_factor
  (Fuel.find_by_name("Motor Gasoline").co2_biogenic_emission_factor * (1 - AutomobileFuel.fallback_blend_portion)) +
  (Fuel.find_by_name("Distillate Fuel Oil No. 2").co2_biogenic_emission_factor * AutomobileFuel.fallback_blend_portion)
end

.fallback_co2_biogenic_emission_factor_units ⇒ Object 



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# File 'lib/earth/automobile/automobile_fuel.rb', line 57

def fallback_co2_biogenic_emission_factor_units
  Fuel.find_by_name("Motor Gasoline").co2_biogenic_emission_factor_units
end

.fallback_co2_emission_factor ⇒ Object 



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# File 'lib/earth/automobile/automobile_fuel.rb', line 43

def fallback_co2_emission_factor
  (Fuel.find_by_name("Motor Gasoline").co2_emission_factor * (1 - AutomobileFuel.fallback_blend_portion)) +
  (Fuel.find_by_name("Distillate Fuel Oil No. 2").co2_emission_factor * AutomobileFuel.fallback_blend_portion)
end

.fallback_co2_emission_factor_units ⇒ Object 



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# File 'lib/earth/automobile/automobile_fuel.rb', line 48

def fallback_co2_emission_factor_units
  Fuel.find_by_name("Motor Gasoline").co2_emission_factor_units
end

.fallback_hfc_emission_factor ⇒ Object 



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# File 'lib/earth/automobile/automobile_fuel.rb', line 85

def fallback_hfc_emission_factor
  fallback_latest_type_fuel_years.map do |tfy|
    tfy.total_travel * tfy.type_year.hfc_emission_factor
  end.sum / fallback_latest_type_fuel_years.sum('total_travel')
end

.fallback_hfc_emission_factor_units ⇒ Object 



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# File 'lib/earth/automobile/automobile_fuel.rb', line 91

def fallback_hfc_emission_factor_units
  fallback_latest_type_fuel_years.first.type_year.hfc_emission_factor_units
end

.fallback_latest_type_fuel_year_ages ⇒ Object 



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# File 'lib/earth/automobile/automobile_fuel.rb', line 15

def fallback_latest_type_fuel_year_ages
  AutomobileTypeFuelYearAge.where(:year => AutomobileTypeFuelYearAge.maximum('year'))
end

.fallback_latest_type_fuel_years ⇒ Object 



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# File 'lib/earth/automobile/automobile_fuel.rb', line 61

def fallback_latest_type_fuel_years
  AutomobileTypeFuelYear.where(:year => AutomobileTypeFuelYear.maximum('year'))
end

.fallback_n2o_emission_factor ⇒ Object 



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# File 'lib/earth/automobile/automobile_fuel.rb', line 75

def fallback_n2o_emission_factor
  fallback_latest_type_fuel_years.weighted_average(:n2o_emission_factor, :weighted_by => :total_travel) * GreenhouseGas[:n2o].global_warming_potential
end

.fallback_n2o_emission_factor_units ⇒ Object 



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# File 'lib/earth/automobile/automobile_fuel.rb', line 79

def fallback_n2o_emission_factor_units
  prefix = fallback_latest_type_fuel_years.first.n2o_emission_factor_units.split("_per_")[0]
  suffix = fallback_latest_type_fuel_years.first.n2o_emission_factor_units.split("_per_")[1]
  prefix + "_co2e_per_" + suffix
end