Environmental benefits of remanufacturing mechanical products: a harmonized meta-analysis of comparative life cycle assessment studies
Environmental benefits of remanufacturing mechanical products: a harmonized meta-analysis of comparative life cycle assessment studies
复制标题
再制造机械产品的环境效益：比较生命周期评估研究的统一荟萃分析
DOI：
10.1016/j.jenvman.2022.114479
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发表时间：
2022
影响因子：
8.7
通讯作者：
Conghu Liu
中科院分区：
文献类型：
--
作者：
Shitong Peng;Jinfeng Ping;Tao Li;Fengtao Wang;Hongchao Zhang;Conghu Liu
具有高附加值的再制造机械产品普遍声称能够获得环境效益。这些说法是根据不同的产品和评估方法提出的。生命周期评估 (LCA) 结果的可变性阻碍了对产品和研究进行有意义的比较。本文旨在批判性地、系统地评估再制造产品与新产品相比的生命周期环境绩效，并确定评估程序中的关键因素、优势和局限性。面对这些值得注意的变化，我们对11类产品筛选出的20篇论文的单位功能、分配方式、系统边界、影响评估方法以及基本假设进行了仔细的审查和协调。本研究采用的环境指标为全球变暖潜势（GWP）和一次能源消耗（PEC）。就这两个指标而言，再制造产品相对于新制造替代品的环境负担被统一到比较比率中。利用这些统一的样本，使用蒙特卡罗模拟计算描述性统计数据，以揭示比较结果的变化并确定总体趋势。这项荟萃研究的结果表明，当生命周期中排除使用和报废阶段时，再制造可以使 GWP 降低 50% 以上。再制造机械产品的GWP和PEC平均分别占新机械产品的28.5%和25.9%。这种对新产品和再制造产品的生命周期评价比较的荟萃分析将促进对再制造的环境优势的理解。
Remanufactured mechanical products with high-added value are generally claimed to gain environmental benefits. These claims were made based on different products and assessment methodologies. The variability of life cycle assessment (LCA) results precludes a meaningful comparison across products and studies. This paper aims to critically and systematically evaluate the lifecycle environmental performance of remanufactured products compared with their new counterparts and to identify the key factors, strengths, and limitations in the assessment procedure. Faced with the noteworthy variations, we closely examined and harmonized the unit function, allocation approach, system boundary, impact assessment method, and the underlying assumptions in screened 20 papers regarding 11 types of products. The environmental indicators adopted in this study were global warming potential (GWP) and primary energy consumption (PEC). In terms of these two indicators, the environmental burdens of remanufactured products relative to newly manufactured alternatives were harmonized to the comparison ratios. With these harmonized samples, descriptive statistics were calculated using Monte Carlo Simulation to disclose the variations of comparison results and identify the general tendency. Results of this meta-study showed that remanufacturing could contribute to over 50% reduction for GWP when usage and end-of-life stages were excluded from the life cycle. The GWP and PEC of remanufactured mechanical products account for 28.5% and 25.9% of the new counterparts, respectively, on average. This meta-analysis of comparative LCAs on new and remanufactured products would advance the understanding of the environmental advantages of remanufacturing.