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• W2078440652 abstract "In a life cycle assessment (LCA) study, the identification and quantification of the inputs and outputs of unit processes or gate-to-gate modules are essential. In general, however, many chemical industries are composed of very complex systems with internally recurring unit processes where the upstream input to a unit process may include the downstream output from a latter unit process. Therefore, it is rather difficult to identify and quantify the inputs/outputs for those internally recurring unit processes, respectively, for life cycle inventory analysis purposes. In this study, several calculation methods which are applicable to complex systems with internally recurring unit processes are proposed as follows: (1) Determination of the inputs/outputs associated with each unit process by using simultaneous equations. In this proposal, any parameter linked to an upstream process is treated as a ‘variable’ and the set of other parameters is considered to be a ‘constant’. (2) Determination of the inputs/outputs by using appropriate cut-off criteria based on the cumulative total mass contribution. (3) Determination of the inputs/outputs by using appropriate cut-off criteria based on the number of occurrences of an individual recurring set of unit processes. The results from these methodologies are analyzed using a hypothetical example and an actual case from the petrochemical industry. These methods enhance the reliability and consideration of on-site information in recurring unit processes. In particular, the determination of the inputs/outputs associated with each unit process by using simultaneous equations does not add assumptions regarding cut-off criteria selection and provides the advantages of time conservation, consistency and affinity to on-site consideration." @default.
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• W2078440652 date "2003-11-01" @default.
• W2078440652 modified "2023-10-18" @default.
• W2078440652 title "Analysis of internally recurring unit processes in life cycle assessment" @default.
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• W2078440652 doi "https://doi.org/10.1016/s0959-6526(02)00150-6" @default.
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