Development of a model for the prediction of the fuel consumption and nitrogen oxides emission trade-off for large ships
Artikel i vetenskaplig tidskrift, 2015

The international regulations on fuel efficiency and NOx emissions of commercial ships motivate the investigation of new system layouts, which can comply with the regulations. In combustion engines, measures to reduce the fuel consumption often lead to increased NOx emissions and careful consideration of this trade-off mechanism is required in the design of marine propulsion systems. This study investigates five different configurations of two-stroke diesel-based machinery systems for large ships and their influence on the mentioned trade-off. Numerical models of a low-speed two-stroke diesel engine, turbochargers and an ORC (organic Rankine cycle), are used for the optimisation of the NOx and fuel consumption at design and part-load conditions, using a multi-objective genetic algorithm. Moreover, the effects of engine tuning and exhaust gas recirculation are investigated. The results suggest that increased system complexity can lead to lower fuel consumption and NOx. Fuel consumption reductions of up to 9% with a 6.5% NOx reduction were achieved using a hybrid turbocharger and organic Rankine cycle waste heat recovery system.

Organic Rankine cycle

Part-load performance optimisation

NOx emissions

Waste heat recovery

Two-stroke low-speed diesel engine


Ulrik Larsen

Chalmers, Sjöfart och marin teknik, Maritim miljövetenskap

L. Pierobon

Danmarks Tekniske Universitet (DTU)

Francesco Baldi

Chalmers, Sjöfart och marin teknik, Maritime Operations

Fredrik Haglind

Danmarks Tekniske Universitet (DTU)

Anders Ivarsson

Danmarks Tekniske Universitet (DTU)


0360-5442 (ISSN)

Vol. 80 545-555







Innovation och entreprenörskap



Mer information

Senast uppdaterat