Development of a model for the prediction of the fuel consumption and nitrogen oxides emission trade-off for large ships
Journal article, 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, Shipping and Marine Technology, Maritime Environmental Sciences

L. Pierobon

Technical University of Denmark (DTU)

Francesco Baldi

Chalmers, Shipping and Marine Technology, Division of Maritime Operations

Fredrik Haglind

Technical University of Denmark (DTU)

Anders Ivarsson

Technical University of Denmark (DTU)


0360-5442 (ISSN)

Vol. 80 545-555

Areas of Advance



Subject Categories

Energy Engineering

Driving Forces

Innovation and entrepreneurship



More information

Latest update