Master Degree / Yüksek Lisans Tezleri

Permanent URI for this collectionhttps://hdl.handle.net/11147/3008

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Access Right: Open AccessSubject: search.filters.subject.Environmental impact analysis

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  • Master Thesis
    Energy, Exergy and Enviromental Assessment of a Novel Multi-Generation System Fed by Biomass and Geothermal Energy Sources
    (01. Izmir Institute of Technology, 2022) Gökçen Akkurt, Gülden; Mohammadpourfard, Mousa; Gökçen Akkurt, Gülden; Mohammadpourfard, Mousa; 03.06. Department of Energy Systems Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    Energy is the one of the critical tools that ensure the development of the countries. Since almost no country is completely energy independent, it is very important for countries to use the available energy efficiently and to produce their own energy from renewable energy sources. Multi-generation systems combine various cycles and processes to produce number of outputs and valuable market products using one or multiple energy sources as input. By creating a multi-generation system powered by renewable sources can increase system efficiency and provide some additional outputs such as hydrogen, heating, cooling, and domestic hot water. In this thesis, a novel multi-generation system consisting of a biomass gasification cycle, a double-flash geothermal cycle, an Organic Rankine Cycle and a PEM electrolyzer subsystems, is proposed to increase the efficiency and energy production from biomass and geothermal energy sources instead of using a single source for a single output. The proposed system is analyzed in terms of energy, exergy, and environmental impact point of view. By performing parametric studies for biomass flow rate, turbine inlet temperature, and single-objective optimization, effects on thermodynamic behavior and environmental impact are investigated for subsystems and overall system. The best operating conditions are determined. The findings indicate that energy efficiency of the proposed multi-generation system is 75% higher than a double-flash geothermal power plant. Based on the parametric study, biomass mass flow rate is encountered as the most significant parameter, which caused an 11.7% increase in energy efficiency, and 225% increase in environmental impact cost.
  • Master Thesis
    Life Cycle Environmetal Impact Assessment of a Multi-Storey Residential Building in Izmir
    (Izmir Institute of Technology, 2012) Aral, Duygu; Durmuş Arsan, Zeynep; Durmuş Arsan, Zeynep; 02.02. Department of Architecture; 02. Faculty of Architecture; 01. Izmir Institute of Technology
    For a sustainable development, it is essential to improve the building stock and sector which are majorly affiliated with the negative impacts on environment. The analysis of current situation and establish the basic problems in order to decrease the environmental impacts of buildings. Life Cycle Assessment (LCA) is a holistic and scientific method in the area of environmental impact assessment. While the LCA may be applied to individual building components or specified life cycle phases, it is also possible to assess the environmental impacts of a building from cradle to grave with an integrated approach toward whole life cycle. The purposes of this study are to evaluate the current position of the LCA method, which is a vital component of the sustainability assessment in building sector, and to make a quantitative assessment on the environmental impacts of multi-storey-mass housing which has the primary share of recent residential building stock in Turkey. One residential unit of a mass housing development in Izmir constructed at the last decade, at the edge of the expanding city boundary, was selected as the case object of this study. The life cycle of building is fundamentally examined in three phases, which are: pre-use phase, use phase and end-of-life phase. The Simapro software 7.3.3 and Ecoinvent 2.2, up-to-date database, were selected for the LCA simulation. In addition, as a local input to database, energy data for Turkey was created. As a result of this study, the environmental impacts during the life cycle of a multi-storey building residential unit have been ascertained and the life phases, building components and operational processes which have the heaviest impact on the environment have been determined.