Ανάλυση κόστους και περιβαλλοντικών επιπτώσεων κύκλου ζωής φυσικού αερίου

Μπίσιας, Δημήτριος; Bissias, Dimitros

dc.contributor.author	Μπίσιας, Δημήτριος	el
dc.contributor.author	Bissias, Dimitros	en
dc.date.accessioned	2020-12-16T11:11:59Z
dc.date.available	2020-12-16T11:11:59Z
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/52559
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.20257
dc.rights	Αναφορά Δημιουργού - Μη Εμπορική Χρήση - Παρόμοια Διανομή 3.0 Ελλάδα	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc-sa/3.0/gr/	*
dc.subject	Φυσικό αέριο	el
dc.subject	Περιβάλλον	el
dc.subject	Ανάλυση επιπτώσεων	el
dc.subject	Φαινόμενο θερμοκηπίου	el
dc.subject	Μεθάνιο	el
dc.subject	GHG	en
dc.subject	Life cycle assessment	en
dc.subject	LCA	en
dc.subject	LNG	en
dc.subject	Natural gas	en
dc.subject	Pollution	en
dc.subject	Environment	en
dc.title	Ανάλυση κόστους και περιβαλλοντικών επιπτώσεων κύκλου ζωής φυσικού αερίου	el
dc.title	Life cycle Assessment of Natural Gas	en
heal.type	bachelorThesis
heal.classification	Ecology	en
heal.classification	Marine Engineering	el
heal.classification	Pollution	en
heal.classification	Environment	en
heal.classification	Ρύπανση	el
heal.language	en
heal.access	campus
heal.recordProvider	ntua	el
heal.publicationDate	2020-11-09
heal.abstract	The turn of the millennia has uncovered an unprecedented concern over the environment and appropriate use of its resources. In order to limit and, in the future, reverse humanity’s impact on the Earth, it is required to consider transition from traditional fuels into more “clean” and eco-friendly. Natural gas (or in its liquid form LNG) is now at the centre of interest due to the increased environmental qualities during combustion, providing the green aspect requested. Huge investments are made in favour of LNG infrastructure, providing clear grounds that it is preferred over traditional fossil fuels. However, an essential aspect of the use of gas is the methane slip, the escape and direct emission to the atmosphere of methane (since natural gas mainly consists of methane). This phenomenon has proven almost impossible to eliminate and is not underlined sufficiently. Methane is a short-lived gas, remaining in the atmosphere for less than 15 years, that is much more potent than carbon dioxide, the traditional suspect of all environmental problems. For the sake of assessing the effectiveness of such a transition, multiple studies have been carried out estimating the lifecycle emissions of natural gas; it would not be logical to adhere to the combustion phase only as it is broadly suggested. However, in the initial environmental studies, the 100-year span was selected, limiting the comparison of the impact considered for methane with regards to carbon dioxide. Due to the reduced lifespan of methane, more and more experts promote the use of a much shorter period (20-year). This preference has been further endorsed by multiple revisions of estimations of methane and overall emissions of all sectors. In this respect, using the GWP 20-year factor, methane is 84 times more potent than carbon dioxide, with the factor growing as the study period shortens. In order to address the problem and provide an estimate, the total emission calculation of the lifecycle of natural gas is used, a well-to-grave approach. All substances natural gas consists of are paralleled using weight factors (GWP), estimating the total actual “damage” occurred to the environment. A base scenario has been chosen as the most representative for the gas lifecycle, meaning that it constitutes almost the norm instead of an exception. Based on the above, at every step of the lifecycle of natural gas, the emissions are calculated for the leading gases, multiplied by the weight factor and summed. The goal of this Thesis is, in the end, to pinpoint the totals at each stage as well as compare briefly overall emissions with the current fossil fuel most commonly used, crude oil and its by-products. As will be shown, the decisive factor in the process is methane, given the relative impact on the environment of other gases does not change so drastically. The time period considered is of great importance in the outcome. This breakdown will also demonstrate that the combustion phase, so heavily promoted in internal combustion engines, only covers a small per cent of the overall emissions. On the other hand, given the base scenario set forth, there are tremendous capabilities if the existing infrastructure is improved and collaborations between key players are born. For example, an industrial complex owned by the same company, which includes an electricity production facility together with an LNG regasification facility and the necessary interconnections, would provide an undisputed operational and environmental efficacy.	en
heal.advisorName	Λυρίδης, Δημήτριος
heal.advisorName	Lyridis, Dimitrios	el
heal.committeeMemberName	Ζαραφωνίτης, Γεώργιος	el
heal.committeeMemberName	Ventikos, Nikolaos	en
heal.committeeMemberName	Βεντίκος, Νικόλαος	el
heal.committeeMemberName	Zaraphonitis, Georgios	en
heal.academicPublisher	Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Ναυπηγών Μηχανολόγων Μηχανικών	el
heal.academicPublisherID	ntua
heal.fullTextAvailability	false