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D r a f t. Life Cycle Assessment A product-oriented method for sustainability analysis UNEP LCA Training Kit Module i – The mathematics of LCIA. D r a f t. Characterisation models Characterisation factors The characterisation step. Contents. Characterisation models. impact.

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D r a f t

Life Cycle AssessmentA product-oriented methodfor sustainability analysisUNEP LCA Training KitModule i – The mathematics of LCIA


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D r a f t

  • Characterisation models

  • Characterisation factors

  • The characterisation step

Contents


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Characterisation models

impact

mass (or concentration)


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Characterisation factors (1)

impact

mass (or concentration)


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Characterisation factors (2)

  • Infinitesimal small change:

  • Substance and category dependence:

  • Multiple substance dependence


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Characterisation models (1)

  • Characterization models express the relationship between the category indictor and the outputs

  • Characterization factors are derived from models that predict the impact


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Characterisation models (2)

  • Often developed outside LCA

    • IPCC, WMO, …

  • derivative

    • linearised model

    • only valid for small change

  • partial derivative

    • constant background


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The characterisation step (1)

  • Conversion and aggregation

    • conversion

    • aggregation

    • together


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The characterisation step (2)

  • Or in matrix form

  • or even more condensed

    • here no problems with inversion or non-square matrices


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