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Study case
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Colors
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Let's calculate the carbon footprint of a washing machine (in a simplified & schematic way)
Source : external or Estimation
Calculation (+, -, x, /)
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Let's look at 5 phases : production > freight transport > client transport > use > end of life
Source : Emission Factor Databases
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Warning : mind the metrics (g / kg / t)
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Production
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Data requiredValueUnitSource
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Weight70kghttps://www.cdiscount.com/electromenager/lavage-sechage/achat-lave-linge/combien-pese-un-lave-linge-f/q-l-1100104-464.html
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Data requiredValueAssumption
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% steel0,95
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% electronics0Negligible
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% plastics0,05Don't weigh much
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Calculation
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Steel66,5kgX2211kgCO2e/tonne=147kgCO2e
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Plastics3,5kgX2383kgCO2e/tonne=8kgCO2e
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Total155kgCO2e
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Freight transport
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Data requiredValueUnitAssumption
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Distance factory - store
250kmNational production
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Calculation
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Trafic250kmX71gCO2e/tkm=1kgCO2e
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Client transport
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Data requiredValueUnitAssumption
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Distance home - store
10kmRural area close to a mall center
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Assumption
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Client comes by car
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Calculation
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Trafic20kmX193gCO2e/km=4kgCO2e
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Use
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Data requiredValueUnitSource
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Power2 500Whttps://www.totalenergies.fr/particuliers/parlons-energie/dossiers-energie/logement/puissance-d-une-machine-a-laver-comment-la-choisir
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Assumption
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Client uses2times / week
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With2h / program
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Nb of weeks / year52
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Nb of years10
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Calculation
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Energy consumption
5200kWhX60gCO2e/kWh=312kgCO2e
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End of life
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Steel66,5kgX311kgCO2e/tonne=21kgCO2e
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Plastics3,5kgX1479kgCO2e/tonne5kgCO2e
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Total26kgCO2e
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Conclusion
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PhasesValueUnit
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Raw materials production
155kgCO2e
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Freight transport1kgCO2e
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Client transport4kgCO2e
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Use312kgCO2e
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End of life26kgCO2e
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Total498kgCO2e
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