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LCA Vocabulary
Vocabulary for life cycle assessment terms
26
Civil Engineering
Undergraduate 4
03/30/2011

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Term
Allocation
Definition
Partitioning the input or output flows of a process or product system between the product system under study and one or more other product systems
Term
Ancillary input
Definition
material input that is used by the unit process producing the product, but which does not constitute part of the product
Term
Category endpoint
Definition
attribute or aspect of natural environment, human health or resources identifying an environmental issue giving cause for concern
Term
Category indicator
Definition
Quantifiable representation of an impact category
Term
Characterization factor
Definition
Factor derived from a characterization model which is applied to convert an assigned life cycle inventory analysis result to the common unit of the category indicator
Term
Comparative assertion
Definition
Environmental claim regarding the superiority or equivalence of one product versus a competing product that performs the same function
Term
Co-product
Definition
Any of two or more products coming from the same unit process or product system
Term
Cut-off criteria
Definition
Specification of the amount of material or energy flow or the level of environmental significance associated with the unit processes or product system to be excluded from a study
Term
Elementary flow
Definition
Material or energy entering the system being studied that has been drawn from the environment without previous human transformation, or material or energy leaving the system being studied that is released into the environment without subsequent human transformation
Term
Environmental mechanism
Definition
System of physical, chemical or biological processes for a given impact category, linking the life cycle inventory analysis results to category indicators and to category endpoints
Term
Feedstock energy
Definition
Heat of combustion of a raw material input that is not used as an energy source to aproduct system, expressed in terms of higher heating value or lower heating value
Term
Functional unit
Definition
Quantified performance of a product system for use as a reference unit
Term
Impact category
Definition
Class representing environmental issues of concern to which life cycle inventory analysis results may be assigned
Term
Process
Definition
Set of interrelated or interacting activities that transforms inputs into outputs
Term
Process energy
Definition
Energy input required for operating the process or equipment within a unit process, excluding energy inputs for production and delivery of the energy itself
Term
Product
Definition
Any goods or service
Term
Product system
Definition
Collection of unit processes with elementary and product flows, performing one or more defined functions, and which models the life cycle of a product
Term
Life cycle
Definition
Concesucive and interlinked stages of a product system, from raw material acquisition or generation fram natural resources to final disposal
Term
Life cycle assessment (LCA)
Definition
Compilation and evaluation of the inputs, outputs and potential impacts of a product system throughout its life cycle
Term
Life cycle inventory (LCI) analysis
Definition
Phase of LCA involving the compilation and quantification of inputs and outputs for a product throughout its life cycle
Term
Life cycle inventory (LCI) result
Definition
Outcome of a life cycle inventory analysis that catalogues the flows crossing the system boundary and provides the starting point for the life cycle impact assessment
Term
Life cycle impact assessment (LCIA)
Definition
Phase of LCA aimed at understanding and evaluating the magnitude and significance of the potential environmental impacts for a product system throughout the life cycle of the product
Term
Life cycle interpretation
Definition
Phase of LCA in which the findings of either the inventory analysis or the impact assessment, or both, are evaluated in relation to the defined goal and scope in order to reach conclusions and recommendations
Term
Raw material
Definition
Primary or secondary material that is used to produce a product
Term
Reference flow
Definition
Measure of the outputs from processes in a given product system required to fulfill the function expressed by the functional unit
Term
System boundary
Definition
Set of criteria specifying which unit processes are part of a product system, and which impacts created by the product system are considered
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