The University of Southampton
University of Southampton Institutional Repository

Investigation of hybrid systems for diesel powered ships

Investigation of hybrid systems for diesel powered ships
Investigation of hybrid systems for diesel powered ships
The combination of a prime mover and an energy storage device for reduction of fuel consumption has been successfully used in the automotive industry. The potential of a load levelling strategy and the energy management optimisation through the use of a Hybrid Diesel propulsion system for ocean going ships is investigated. The goal of Diesel Hybrid systems is to reduce exhaust gas emissions by reducing fuel oil consumption though an introduction of an energy storage medium. Part of the research is based on operational data for a shipping fleet containing all types of bulk carriers. The engine loading and energy requirements are estimated and the sizing of suitable propulsion and the battery storage system is proposed. The changes in overall emissions are estimated and the potential for fuel savings is identified. The emission estimation is made by applying a bottom up approach, and the use of fuel based factors. The thesis includes an assessment of the calculation error imposed by the usage of fuel-based factors, and a determination of the uncertainty in the approximation of global shipping emissions is made. Constructional and volume constraints are identified and a concept feasibility is performed.

The thesis demonstrates the use of developed ship voyage simulator, which is a time domain quasi-steady simulation tool. The system components of the Hybrid and the conventional machinery system are modelled, the weather characteristics and the hull-fluid interaction are implemented in a modular, scalable and expandable manner. Using the simulation tool, an assessment of simulated bottom up approach with the results of the IMO formula is presented for a number of examined voyages. Moreover, simulator outputs of the propulsive demand are fed to the optimisation algorithm, which is based on the equivalent cost minimisation strategy. In addition, a pseudo multi-objective optimisation algorithm for CO2 and PM reduction is also presented. The results indicate that the ship simulator estimates shipping emissions with a significantly smaller error than the adopted formulae of the IMO.

The hybrid solution for diesel powered ships is under specific scenarios financially viable, and the fuel savings based on the statistical analysis are notable when ageing of the engines and performance deterioration models are included. Nevertheless, when the optimised performance of the Hybrid power layouts is compared to optimally tuned engines at ISO conditions, instead of the actual prime mover performance, the fuel saving potential for auxiliary loads is reduced and also leads to non-feasible results for propulsive loads. Nonetheless, the Hybrid power systems permit the use of sophisticated prime mover energy management for both propulsive and auxiliary loads. This proved to lead to notable fuel savings for the combined shipboard power trains.
Dedes, Eleftherios K.
5f8e7940-bb93-44bb-8d4e-5b50930d6afc
Dedes, Eleftherios K.
5f8e7940-bb93-44bb-8d4e-5b50930d6afc
Turnock, Stephen
d6442f5c-d9af-4fdb-8406-7c79a92b26ce

Dedes, Eleftherios K. (2013) Investigation of hybrid systems for diesel powered ships. University of Southampton, Faculty of Engineering and the Environment, Doctoral Thesis, 323pp.

Record type: Thesis (Doctoral)

Abstract

The combination of a prime mover and an energy storage device for reduction of fuel consumption has been successfully used in the automotive industry. The potential of a load levelling strategy and the energy management optimisation through the use of a Hybrid Diesel propulsion system for ocean going ships is investigated. The goal of Diesel Hybrid systems is to reduce exhaust gas emissions by reducing fuel oil consumption though an introduction of an energy storage medium. Part of the research is based on operational data for a shipping fleet containing all types of bulk carriers. The engine loading and energy requirements are estimated and the sizing of suitable propulsion and the battery storage system is proposed. The changes in overall emissions are estimated and the potential for fuel savings is identified. The emission estimation is made by applying a bottom up approach, and the use of fuel based factors. The thesis includes an assessment of the calculation error imposed by the usage of fuel-based factors, and a determination of the uncertainty in the approximation of global shipping emissions is made. Constructional and volume constraints are identified and a concept feasibility is performed.

The thesis demonstrates the use of developed ship voyage simulator, which is a time domain quasi-steady simulation tool. The system components of the Hybrid and the conventional machinery system are modelled, the weather characteristics and the hull-fluid interaction are implemented in a modular, scalable and expandable manner. Using the simulation tool, an assessment of simulated bottom up approach with the results of the IMO formula is presented for a number of examined voyages. Moreover, simulator outputs of the propulsive demand are fed to the optimisation algorithm, which is based on the equivalent cost minimisation strategy. In addition, a pseudo multi-objective optimisation algorithm for CO2 and PM reduction is also presented. The results indicate that the ship simulator estimates shipping emissions with a significantly smaller error than the adopted formulae of the IMO.

The hybrid solution for diesel powered ships is under specific scenarios financially viable, and the fuel savings based on the statistical analysis are notable when ageing of the engines and performance deterioration models are included. Nevertheless, when the optimised performance of the Hybrid power layouts is compared to optimally tuned engines at ISO conditions, instead of the actual prime mover performance, the fuel saving potential for auxiliary loads is reduced and also leads to non-feasible results for propulsive loads. Nonetheless, the Hybrid power systems permit the use of sophisticated prime mover energy management for both propulsive and auxiliary loads. This proved to lead to notable fuel savings for the combined shipboard power trains.

Text
E_DEDES_THESIS_SOFTCOPY_FINAL.pdf - Other
Available under License University of Southampton Thesis Licence.
Download (10MB)

More information

Published date: 1 July 2013
Organisations: University of Southampton, Civil Maritime & Env. Eng & Sci Unit

Identifiers

Local EPrints ID: 355695
URI: http://eprints.soton.ac.uk/id/eprint/355695
PURE UUID: 18a3ed06-0e8a-43b7-9a2a-51e58b4520cc
ORCID for Stephen Turnock: ORCID iD orcid.org/0000-0001-6288-0400

Catalogue record

Date deposited: 11 Nov 2013 14:42
Last modified: 07 Aug 2018 00:37

Export record

Contributors

Author: Eleftherios K. Dedes
Thesis advisor: Stephen Turnock ORCID iD

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×