Ship emissions calculation from AIS

146 Pages·2016·2.99 MB·English

by  Stian Glomvik Rakke

Ship emissions calculation from AIS
Stian Glomvik Rakke
Master of Science in Engineering and ICT
Submission date: June 2016
Supervisor: Bjørn Egil Asbjørnslett, IMT
Co-supervisor: Ørnulf Jan Rødseth, MARINTEK
Norwegian University of Science and Technology
Department of Marine Technology

Master Thesis
SHIP EMISSIONS CALCULATION FROM AIS
June 24, 2016
Stian Glomvik Rakke
Norwegian University of Science and Technology
Department of Marine Technology
Supervisor: Bjørn Egil Asbjørslett
Co-supervisor: Ørnulf Jan Rødseth

Preface
This thesis was written during the spring of 2016 at the Norwegian University of Science
and Technology (NTNU) in Trondheim, Department of Maritime Engineering. The report is
written as a specialization project in the master degree program of Engineering and ICT.
I would like to thank my supervisor, Professor Bjørn Egil Asbjørnslett and co-supervisor
at NTNU, Professor Ørnulf Jan Rødseth, for guidance and useful feedback during this thesis
writing.
I would also like to give acknowledgment to classmates and other study acquaintances who
helped me in the theory of ship design and shipping, as well as computer programming and
maritime engineering in general.
Trondheim, June 24, 2016
Stian Glomvik Rakke
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Abstract
A methodology, named ECAIS, is presented to calculate ship emissions based on their fuel
consumption from AIS data. This was done to avoid use of commercial ship databases, which
can be expensive for research on sizable fleets. Using the approximation method Holtrop-
Mennen it ws possible to find a distinct ships propulsion power requirements for different
speeds. This empirical method uses main ship characteristics for calculation. From AIS data
several main ship characteristics could be derived. Remaining characteristics was found by
generic ship approximation found in literature surveys. This was used in combination with
power prediction and specific fuel consumption, and applied to different ship size categories,
as fuel consumption is calculated from speeds in dynamic AIS data. Fuel consumption and
CO2 emission were derived and compared to earlier studies.
Results show a sizable difference from Third IMO GHG study. As this study has only been
made for a limited number of data, calculations contains substantial uncertainties which
should be investigated further. Further improvements for ECAIS method has been empha-
sized, which is believed to improve results.
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Sammendrag
I denne masteroppgaven presenteres en metode, kalt for ECAIS, som regner ut utslipp av
miljøgasser fra AIS-data. Dette gjøres for å unngå brukes av kommersielle skipsdatabaser,
som det kan være dyrt å hente informasjon til forskning på store mengder skip fra. Ved å
benytteHoltrop-Mennenerdetmuligåfinneeffektbehovetforpropulsjonforulikehastigheter
i et bestemt skip. Denne metoden benytter seg av skipskarakteristikker for utregninger.
Gjennom AIS-data kan man finne noen av disse skipskarakteristikkene. De resterende skip-
skarakteristikkene ble utledet ved hjelp av generelle approksimasjoner som ble funnet i lit-
teraturstudier. Dette er i en kombinasjon med effektbehovet og et spesifikk forbruksmål
satt i sammenheng med skipsstørrelser, brukt til utregning av skipets forbruk ved spesifikke
hastigheter. Disse hastighetene er funnet i de dynamiske AIS-dataene. Brenselforbruket og
utslippet av miljøgasser ble regnet ut og sammenlignet med tidligere studier.
Resultatet viser en stor forskjell fra utregninger gjort in den tredje IMO GHG-studien. Siden
denne studien kun er utført på et mindre datasett er det stor usikkerhet rundt tallene. Dette
burde bli analysert of utviklet videre. Videre forbedringer er pekt ut, og dette vil trolig
forbedre resultatet til methoden.
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