GHGs Use GWP weights CO 2 1 kg of CO 2 1 kg of CO 2 e CH 4 1 kg of CH 4 28 kg

Ghgs use gwp weights co 2 1 kg of co 2 1 kg of co 2 e

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GHGs - Use GWP weights CO 2 : 1 kg of CO 2 = 1 kg of CO 2 e CH 4 : 1 kg of CH 4 = 28 kg of CO 2 e N 2 O : 1 kg of N 2 O = 265 kg of CO 2 e Can then sum up individual effects into a total (units CO 2 e) For many studies the only LCIA done is global warming o CO 2 : 1 kg of CO 2 = 1 kg of CO 2 e o CH 4 : 1 kg of CH 4 = 28 kg of CO 2 e o N 2 O : 1 kg of N 2 O = 265 kg of CO 2 e o Can then sum up individual effects into a total (units CO 2 e) Source: IPCC 5 th Assessment Report
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L03 Slide 83 Characterization of Impacts Global warming [kg CO 2 eq] GWP Ozone layer depletion [kg CFC-11 eq] ODP Acidification [kg SO 2 eq] AP Eutrophication [kg N eq] EP Summer smog [kg O 3 eq] SP Winter smog [PM 2.5 eq] PMFP Ecotoxicity [CTUeco] ETP Human health [CTU cancer and non-cancer] HTP Midpoint Impacts
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L03 Slide 84 Calculating Metrics Index Mass flow of substance i Weighting factor of substance i Example: Ozone Layer Depletion [kg CFC-11 eq] = ∑ ODP (output i) x (output (output i) )[kg]
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L03 Slide 85 LCIA Valuation Combining different characterized impacts into a single metric Converting “midpoint” values to “endpoint” values Ecosystem Damage Species loss per year Single Score Human health impacts Disability adjusted life year (DALY) Resource Depletion Surplus cost
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L03 Slide 86 LCIA Tools
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L03 Slide 87 LCIA Tools TRACI Based on US data Used to calculate midpoints from inventory Eco-indicator (Intended for designers) Skips directly to single score detailed inventory and midpoints overlooked Do not use for your quantitative LCA in MIE315 ReCiPe Based on European data Two stage analysis: Inventory Midpoint Midpoint Endpoint & Single Score LC-Impact “Spatially differentiated” impacts differ by location Calculated endpoints from inventory or midpoints
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L03 Slide 88 T ool for R eduction and A ssessment of C hemicals and Other Environmental I mpacts T R A C I
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L03 Slide 89 TRACI 2.1 Spreadsheet CAS # Formatted CAS # Substance Name Global Warming Air (kg CO2 eq / kg substance) Acidification Air (kg SO2 eq / kg substance) HH Particulate Air (PM2.5 eq / kg substance) Eutrophicati on Air (kg N eq / kg substance) Eutrophicati on Water (kg N eq / kg substance) 2551624 2551-62-4 SULFUR HEXAFLUORIDE 2.28E+04 0.00E+00 0.00E+00 0.00E+00 0.00E+00 x x TRIFLUOROMETHYL SULFUR PENTAFLUORIDE 1.77E+04 0.00E+00 0.00E+00 0.00E+00 0.00E+00 x x PROPANE, PERFLUOROCYCLO- 1.73E+04 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7783542 7783-54-2 NITROGEN TRIFLUORIDE 1.72E+04 0.00E+00 0.00E+00 0.00E+00 0.00E+00 3822682 3822-68-2 HFE-125 1.49E+04 0.00E+00 0.00E+00 0.00E+00 0.00E+00 75467 75-46-7 HFC-23 1.48E+04 0.00E+00 0.00E+00 0.00E+00 0.00E+00 75729 75-72-9 CFC-13 1.44E+04 0.00E+00 0.00E+00 0.00E+00 0.00E+00 76164 76-16-4 PFC-116 1.22E+04 0.00E+00 0.00E+00 0.00E+00 0.00E+00 75718 75-71-8 CFC-12 1.09E+04 0.00E+00 0.00E+00 0.00E+00 0.00E+00 115253 115-25-3 PERFLUOROCYCLOBUTANE 1.03E+04 0.00E+00 0.00E+00 0.00E+00 0.00E+00 x x PFPMIE 1.03E+04 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Characterization Factors for ~4000 compounds
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L03 Slide 90 ReCiPe ReCiPe calculates: 18 midpoint indicators 3 endpoint indicators Endpoint indicators: 1) Human health 2) Biodiversity 3) Resource scarcity Source: e_Assessment_LCA/ReCiPe
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L03 Slide 91 LCA Overview Source: DfES Book, Ch. 12
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