Techno-economic analysis on LNG carriers

Tapinis, Dionysis; Ταπίνης, Διονύσης

dc.contributor.author	Tapinis, Dionysis	en
dc.contributor.author	Ταπίνης, Διονύσης	el
dc.date.accessioned	2025-05-23T09:46:49Z
dc.date.available	2025-05-23T09:46:49Z
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/61926
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.29622
dc.rights	Default License
dc.subject	Ναυτιλία	el
dc.subject	Shipping	en
dc.subject	Εκπομπές	el
dc.subject	Υγροποιημένο φυσικό αέριο	el
dc.subject	LNG	en
dc.subject	Thermodynamics	en
dc.subject	Losses	en
dc.subject	Exergy	en
dc.title	Techno-economic analysis on LNG carriers	en
heal.type	bachelorThesis
heal.classification	Naval Architecture and Marine Engineering	en
heal.language	en
heal.access	campus
heal.recordProvider	ntua	el
heal.publicationDate	2025-01
heal.abstract	LNG carriers have been utilized for the commercial transportation of liquefied natural gas internationally since the late 1960s. Despite numerous advancements in design throughout the years, the primary propulsion mechanism remains unchanged. In all other commercial shipping sectors, steam turbines have been supplanted by more efficient Diesel engines; however, LNG carriers continue to utilize steam turbines. The primary reason for this is the steam turbine propulsion system's distinctive ability to operate on two inexpensive fuels concurrently: Heavy Fuel Oil and Boil-off Gas. This achievement, coupled with exceptional reliability, guaranteed the survival of the steam turbine. The primary disadvantage of the conventional steam turbine plant is its low thermal efficiency, resulting in elevated fuel consumption. The absence of alternate applications for the boil-off gas has resulted in the perception that it is free of cost. Alternative approaches to use boil-off gas have necessitated modifications in this perspective. Moreover, the natural boil-off rate is diminishing in contemporary LNG carriers due to advancements in tank insulation technology and design. The natural boil-off is inadequate to provide the propulsion power required for the comparatively high operating speeds of the vessel. Consequently, forced boil-off gas or heavy fuel oil is required to supplement the fuel requirement of the boilers, both of which elevate operational expenses. During a burdened cruise, approximately 50% of the energy demand is derived from heavy fuel, whereas up to 80% is utilized during a ballast voyage.	en
heal.advisorName	Dimopoulos, Giorgos	en
heal.committeeMemberName	Προυσαλίδης, Ιωάννης	el
heal.committeeMemberName	Λυρίδης, Δημήτρης	el
heal.academicPublisher	Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Ναυπηγών Μηχανολόγων Μηχανικών. Τομέας Ναυτικής Μηχανολογίας	el
heal.academicPublisherID	ntua
heal.numberOfPages	98 σ.	el
heal.fullTextAvailability	false