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Life Cycle Assessments as a front-end Systems Engineering tool in ship design
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Naval Systems.
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Miljömässiga livscykelanalyser som ett verktyg för systemarbetet i tidiga faser av fartygsprojektering (Swedish)
Abstract [en]

Environmental impact analyses have not been popular in ship design due to the complexity of both the analysis itself and the ship system. This study proposes a framework for life cycle assessments (LCA) for ship design, using a foundation in systems engineering to position the assessment method in the design process. By limiting the analysis to comparing the differences between design alternatives and accepting lower result precision, the effort and level of expertise required is significantly reduced. Reducing the requirement on precision allows for approximate input data as well, enabling the naval architect to use simple methods, e.g. the Holtrop-Mennen method, to provide input data. Despite this imprecision, it is shown that one can observe trends in the result that point toward a design concept with lower impact than its contestors. Further, one must select an evaluation model and database, both determined by experts, that support the analysis well, and a software to present the naval architect with an interface with which he can easily interact. The benefits of such simplified analyses are that little LCA expertise is required, only a few parameters must be modelled and most of the input data is determined, allbeit approximately, through the initial regular ship design process and is readily available. The pitfalls are a low degree of transparency due to the evaluation model and risk for misinterpretation and misuse of the results because of the limit on modelled parameters and assessment precision. Using this framework, with its limitations, lowers the threshold to implementing an LCA as a design review tool in early design stages, a front-end tool, allowing the environmental assessment to affect earlier design decisions in a greater extent than today.

Place, publisher, year, edition, pages
2012. , 71 p.
Trita-AVE, ISSN 1651-7660 ; 2012:49
National Category
Other Mechanical Engineering
URN: urn:nbn:se:kth:diva-102049OAI: diva2:550524
Subject / course
Naval Systems
Available from: 2012-09-10 Created: 2012-09-07 Last updated: 2012-09-10Bibliographically approved

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