VALIDITY OF RESEARCH BOUNDARY IN ENERGY SYSTEM LIFE CYCLE ASSESSMENT

A truncation error resulting from the omission of environmental loads on the higher upstream orders of product system occurs in process life cycle assessment, which causes underestimation of inventory analysis results. The incompleteness of energy life cycle inventory analysis result is quantified by iterative calculation method, the magnitude of this truncation error varies with the type of energy system considered, but can be up to 23%. The completeness significantly increases with increasing iteration times, and surpass 99% at three times order.