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Contents
RailFuel.class_eval do
data_miner do
import "Rail diesel CH4 and N2O emission factors from the EPA GHG Inventory",
:url => 'https://docs.google.com/spreadsheet/pub?hl=en_US&hl=en_US&key=0AoQJbWqPrREqdEppYmtaU2k2Y0k0TS1MaW9iUm16amc&output=csv' do
key 'name'
store 'fuel_name'
store 'ch4_emission_factor', :units_field_name => 'ch4_emission_factor_units'
store 'n2o_emission_factor', :units_field_name => 'n2o_emission_factor_units'
end
process "Ensure Fuel and GreenhouseGas are populated" do
Fuel.run_data_miner!
GreenhouseGas.run_data_miner!
end
process "Convert ch4 and n2o emission factor units to kg co2e / l" do
RailFuel.find_each do |fuel|
if fuel.ch4_emission_factor_units == "grams_per_kilogram" and fuel.density_units == "kilograms_per_litre"
fuel.ch4_emission_factor = GreenhouseGas["ch4"].global_warming_potential * fuel.density * fuel.ch4_emission_factor / 1000.0
fuel.ch4_emission_factor_units = "kilograms_co2e_per_litre"
fuel.save!
else
raise "We don't know how to perform this unit conversion."
end
if fuel.n2o_emission_factor_units == "grams_per_kilogram" and fuel.density_units == "kilograms_per_litre"
fuel.n2o_emission_factor = GreenhouseGas["n2o"].global_warming_potential * fuel.density * fuel.n2o_emission_factor / 1000.0
fuel.n2o_emission_factor_units = "kilograms_co2e_per_litre"
fuel.save!
else
raise "We don't know how to perform this unit conversion."
end
end
end
end
end
Version data entries
9 entries across 9 versions & 1 rubygems