In order to reduce fossil fuel consumption of the Royal Netherlands Navy (RNLN) by 70% in 2050, the use of alternative fuels on the large naval surface vessels is examined. This paper examines the implications for the design and operational effectiveness of these vessels by performing two case studies of the Zeven Provinci¨en air defence and command frigate (LCF) and the Johan de Witt landing platform dock (LPD). In the case studies an operational analysis, a parametric design study, and an effectiveness assessment are performed on multiple proposed designs. Results showed that it is possible to reduce the fossil fuel consumption of the RNLN by almost 70%. This does affect the design of the vessels, however. It was also concluded that the LPD is more suitable for the application of low-energy-density fuels than the LCF, due to its missions requirements. Both the LPD and the LCF show a significant increase in displacement and fuel cost, but it is possible to reduce effects on the operational effectiveness to a minimum.@en

Design of a hybrid diesel-fuelled PEMFC system for application onboard naval ships is challenging for mul-tiple reasons. The fact that new technologies are used is only one of them. Less obvious, but also very challeng-ing is for instance choosing the ratio between installed battery capacity and fuel cell power. This ratio is a typi-cal design issue for hybrid systems. Dynamic models are necessary to find an optimal solution to this issue. In this paper the developed dynamic models are discussed, some in more detail, after which simulation results will be shown.@en