Simulation-based Life Cycle Performance Assessment is introduced as a method to assess environmental characteristics and costs of energy generation onboard ships. Therefore, the entire life cycle of the system is investigated: System simulations of the operational phase are combined with inventory data for upstream (and downstream) processes, e.g. fuel production, in order to quantify emissions, costs and energy use. In addition, impact assessment is used to describe potential environmental impacts rather than pure emissions to improve comparability and comprehensibility. This method may not only be used to compare different systems in order to assist in decision making processes but also allows to identify weak-points and improvement options in system design and operation. This is demonstrated for a case study of an energy system onboard a RoPax ferry.

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