Session 3.3 LCA Impact Assessment and Interpretation.pptx

Session 3.3 LCA Impact Assessment and Interpretation.pptx -...

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Sessions 3.3-3.4 Life Cycle Assessment Impact Assessment and Interpretation September 20, 2016
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ISO LCA Standard Phases 1. Goal Definition/Scoping 2. Inventory Analysis 3. Impact Assessment 4. Interpretation Eco-audit stopped after inventory analysis; in the next two sessions, we’ll work through all 4 stages of an LCA
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Why are we conducting an LCA? Identify the LCA Objective
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Why are we conducting an LCA? Manufacturers of single-serve coffee makers claim that they are a more "sustainable" alternative than conventional multi-serve coffee makers. However, there are concerns with increased solid waste from packaging, and potentially other usage-related factors that lead us to question this notion. To answer this question definitively, we choose to perform an LCA on both types of coffee makers under different usage scenarios. Identify the LCA Objective
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What will the LCA be used for? Who is the intended audience of the LCA Will the LCA be comparative with assertions disclosed to the public?
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What will the LCA be used for? The LCA will be used to determine which set of parameters in the life cycle of a coffee maker affect specific environmental or economic impact metrics most significantly. Additionally, the LCA would also determine under what set of values for these key parameters does the single serve coffee maker perform better (if at all). Who is the intended audience of the LCA? Coffee drinkers and companies designing and manufacturing coffee makers. Will the LCA be comparative with assertions disclosed to the public? No, though it would be nice if the LCA along with its assumptions will be made available to general public as a peer-reviewed conference or journal publication.
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Formalize the Target of the Study What is the function of the system? What is the functional unit of measure that will define the scale of the analysis What is the reference flow?
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Formalize the Target of the Study What is the function of the system? Provide hot coffee. What is the functional unit of measure that will define the scale of the analysis? Service provided by a coffee maker to a household with two adults over a period of three years, which is assumed as the service life of both coffee makers. What is the reference flow? 584 liters of medium roast (regular strength) coffee produced every year for three years, amounting to 1754 liters of coffee. This number is obtained by assuming a consumption of 2.67 12-ounce cups per person per day on average, which accounts for seasonal variation on coffee consumption over a year.
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Identify System Boundaries What life cycle stages will be included in the scope of the study? What time and geographic boundaries are placed on the system? 9
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Identify System Boundaries What life cycle stages will be included in the scope of the study? Material extraction, processing, and distribution of coffee maker components; production, roasting, and distribution of coffee and other consumables during the use phase of the coffee maker; energy use during use phase; end of life of the coffee grounds, coffee packaging, and the coffee maker itself.
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