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Xydis G.,Technical University of Denmark | Xydis G.,Center for Research and Technology Hellas | Nanaki E.,University of Western Macedonia | Koroneos C.,Unit of Environmental Science and Technology
Sustainable Energy Technologies and Assessments | Year: 2013

In the energy area, intensive efforts are being made over the last years to bridge the supply area with renewable energy sources and the demand side with energy conservation. Energy recovery from municipal solid waste landfills can play a contributing role in the solution of problems of both waste management and energy areas. The objective of this work is to analyze exergeticaly the electricity production from a landfill in the area of Volos, Greece and discuss how the extension of the landfill influences electricity production, something not studied so far. The electricity production potential was analyzed for every extension phase and comparative results are presented. © 2013 Elsevier Ltd.

Petrakopoulou F.,Unit of Environmental Science and Technology | Petrakopoulou F.,National Technical University of Athens | Petrakopoulou F.,Campus Management | Petrakopoulou F.,Technical University of Crete | And 2 more authors.
Journal of Energy Resources Technology, Transactions of the ASME | Year: 2014

This paper presents an evaluation of the environmental performance of an advanced zero emission plant (AZEP) including CO2 capture. The evaluation is conducted with the aid of an advanced exergoenvironmental analysis. The results are compared with those of a reference combined-cycle power plant without CO2 capture. Advanced exergy-based methods are used to (a) quantify the potential for improving individual components or overall systems, and (b) reveal detailed interactions among components-two features not present in conventional analyses, but very useful, particularly when evaluating complex systems. In an advanced exergoenvironmental analysis, the environmental impacts calculated in a conventional exergoenvironmental analysis are split into avoidable/unavoidable (to evaluate the potential for component improvement) and endogenous/exogenous (to understand the interactions among components) parts. As in the reference plant, the potential for reducing the environmental impact of the AZEP has been found to be limited by the relatively low avoidable environmental impact associated with the thermodynamic inefficiencies of several of its components. However, although the environmental impacts for the majority of the components of the plant are related mainly to internal inefficiencies and component interactions are of secondary importance, there are strong interactions between the reactor and some other components. Copyright © 2014 by ASME.

Theodosiou G.,Unit of Environmental Science and Technology | Koroneos C.,Unit of Environmental Science and Technology | Stylos N.,Unit of Environmental Science and Technology
Sustainable Energy Technologies and Assessments | Year: 2014

Anthropogenic activities, such as the use of fossil energy sources for electricity generation, are the main contributors to the pollution of the environment. The main energy source used in the Greek electricity generation sector is lignite as there are large reserves in the country. Petroleum is also used at a great extent mainly in the islands in the autonomous power generation systems, while the use of natural gas is also increasing. Although lignite is a "cheap" energy source, the environmental impacts associated with its use are high, something that applies also for petroleum and in a lower extent with natural gas. The total net production of electricity from thermal power plants in Greece accounts for almost 90% of the total electricity production, while only 10% derives from hydroelectric energy and other renewable energy sources (RES). A typical example of the significance of the environmental impacts associated with the electricity generation sector is the fact that almost 74% of the total CO2 emissions in the country derive from this sector. The work presented in this paper is focused in investigating the environmental impacts associated with the atmospheric emissions and other wastes that are produced during the life cycle of the energy sources (fossil and RES) used for electricity generation in Greece. The environmental evaluation of the different energy sources is performed through the life cycle analysis methodology and the Eco-indicator 99 method and the results are used for comparison purposes. © 2013 Elsevier Ltd.

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