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A system approach to selective catalytic reduction deNOx monolithic reactor modelling using bond graphs
Nielsen, Jørgen Bremnes; Pedersen, Eilif (Journal article; Peer reviewed, 2018)Stricter NOx emission limits for marine diesel engines have resulted in a market demand for engine external NOx reduction solutions. This demand has led to the development of ammonia-based selective catalytic reduction ... -
Global Shipping Emissions from a Well-to-Wake Perspective: The MariTEAM Model
Kramel, Diogo; Muri, Helene; Kim, YoungRong; Lonka, Radek; Nielsen, Jørgen Bremnes; Ringvold, Anna L.; Bouman, Evert Alwin; Steen, Sverre; Strømman, Anders Hammer (Peer reviewed; Journal article, 2021)Improving the robustness of maritime emission inventories is important to ensure we fully understand the point of embarkment for transformation pathways of the sector toward the 1.5 and 2°C targets. A bottom-up assessment ... -
Impact of simulation model fidelity and simulation method on ship operational performance evaluation in sea passage scenarios
Nielsen, Jørgen Bremnes; Sandvik, Endre; Pedersen, Eilif; Asbjørnslett, Bjørn Egil; Fagerholt, Kjetil (Journal article; Peer reviewed, 2019)In this paper, we present and investigate important factors that influence a vessels fuel consumption during operation and what model fidelity that is required to adequately capture these factors in fuel consumption ... -
Improving pre-turbine SCR systems in marine two stroke diesel engines using hybrid turbocharging: a numerical study of SCR operation range and system fuel efficiency
Nielsen, Jørgen Bremnes; Yum, Kevin Koosup; Pedersen, Eilif (Journal article; Peer reviewed, 2019)In this article, a performance evaluation of a novel system solution combining a hybrid turbocharger and a pre-turbine selective catalytic NOx reduction system is carried out. Pre-turbine selective catalytic system are ... -
Modeling and Simulation for Design Evaluation of Marine Machinery Systems
Nielsen, Jørgen Bremnes (Doctoral theses at NTNU;2019:207, Doctoral thesis, 2019)The maritime industry is facing significant changes in the design of marine machinery systems due to stricter regulations on the emission of air pollutants and greenhouse gases and the need for increased energy efficiency. ... -
On the modelling of heat exchangers and heat exchanger network dynamics using bond graphs
Nielsen, Jørgen Bremnes; Pedersen, Eilif (Journal article; Peer reviewed, 2018)Heat exchanger networks are important systems in most thermal engineering systems and are found in applications ranging from power plants and the process industry to domestic heating. Achieving cost-effective design of ... -
Operational sea passage scenario generation for virtual testing of ships using an optimization for simulation approach
Sandvik, Endre; Nielsen, Jørgen Bremnes; Asbjørnslett, Bjørn Egil; Pedersen, Eilif; Fagerholt, Kjetil (Peer reviewed; Journal article, 2020)In this paper, a model for implementation of sea passage operational scenarios in the context of simulation-based design of ships is presented. To facilitate the transition towards more energy-efficient shipping, the ability ...