ΔΗΜΟΣΙΕΥΣΕΙΣ | MSc in Energy Systems

ΔΗΜΟΣΙΕΥΣΕΙΣ

15 ΔΕΚΕΜΒΡΙΟΥ 2016

ΤΙΤΛΟΣ:

The Role of Residential Load-management in the Support of RES- Based Power Generation in Remote Electricity Grids

ΣΥΓΓΡΑΦΕΙΣ:

Marinos Stathopoulos, Dimitrios Zafirakis, , Kosmas Kavadias, John K. Kaldellis

Increased interest is recently demonstrated in the promotion of distributed generation based on renewable energy sources (RES). Contrariwise, owed to RES intermittency, most remote areas rely on oil-fired power generation. To facilitate further penetration of RES, the concept of demand side management (DSM) has lately emerged. To this end, a new DSM algorithm is currently developed. Peak shaving and load shifting are applied, considering implementation levels that the residential sector may comply with. Finally, a small-medium scale island grid is used as case study, with our results indicating that the appropriate level of DSM application may yield considerable benefits.

ΕΤΟΣ ΔΗΜΟΣΙΕΥΣΗΣ:

2013

ΛΕΞΕΙΣ ΚΛΕΙΔΙΑ:

Demand side management, Peak shaving, Load shifting, Hybrid RES systems, Island grid

Επιστημονικό Περιοδικό/Συνέδριο:

Energy Procedia Journal, Vol.46, pp.281-286

15 ΔΕΚΕΜΒΡΙΟΥ 2016

ΤΙΤΛΟΣ:

Strategic planning in the electricity generation sector through the development of an integrated Delphi-based multi-criteria evaluation model

ΣΥΓΓΡΑΦΕΙΣ:

Kaldellis J.K., Anestis A., Koronaki I.

ΠΕΡΙΛΗΨΗ (ABSTRACT) ΔΗΜΟΣΙΕΥΣΗΣ

Decision making process in selecting the most suitable technological solutions for electricity power generation in terms of strategic planning comprises a rather complex procedure with several contradicting factors involved. In this context, development of an appropriate evaluation methodology that will provide decision makers with a useful tool is the aim of the specific study. To achieve this, the Delphi method is used in order to compare a number of alternative technologies with respect to several characteristics, e.g. cost, environmental impacts, social impacts and technological status. According to this method, a properly formed questionnaire is sent to a number of experts, currently related to the power generation sector. After the evaluation of results, weight factors are determined, so that the different technologies can be ranked according to both their scoring in each criterion category and their global scoring, independently of categories, on the basis of a multi-criteria analysis. Emphasis is currently given on the electricity generation sector of Greece, with application of the developed methodology carried out for Crete, i.e. the biggest Greek island.

ΕΤΟΣ ΔΗΜΟΣΙΕΥΣΗΣ:

2013

ΛΕΞΕΙΣ ΚΛΕΙΔΙΑ:

Εlectricity generation technologies, Decision making, Weight factors, Crete

Επιστημονικό Περιοδικό/Συνέδριο:

Fuel, Vol.106, pp.212-218

15 ΔΕΚΕΜΒΡΙΟΥ 2016

ΤΙΤΛΟΣ:

Evaluation of Building Integrated Photovoltaic Systems’ Potential in the Industrial Sector: Case Study Oinofyta-Viotia Zone, Greece

ΣΥΓΓΡΑΦΕΙΣ:

Georgios A. Vokas, Panagiotis G. Klironomos and John K. Kaldellis

ΠΕΡΙΛΗΨΗ (ABSTRACT) ΔΗΜΟΣΙΕΥΣΗΣ

Different methodologies and assumptions have been used in the past concerning estimation of the potential of Building Integrated Photovoltaic (BIPV) systems, usually adopting macroscopic statistical data for the country each time examined. On the other hand, the currently proposed methodology underlines the importance of using more realistic and case-specific data that can be obtained by performing accurate technical audits and by considering the most recent PV market information. To this end, emphasis is given in the specific study on the country of Greece, where although increase of PV installations is ongoing -due to the financial incentives provided by the Greek State and the support offered by the EU- progress met in the use of BIPV systems in the industrial sector is discouraging, opposite to the situation met in other EU countries. Acknowledging the above, the proposed methodology is currently applied so as to evaluate the BIPV potential of an industrial zone found in the proximity of the Greek capital, Athens. The results of this study can be used by both other researchers, for similar evaluations, and energy policy makers, to support the clean energy production concept on the basis of BIPV systems in industrial areas.

ΕΤΟΣ ΔΗΜΟΣΙΕΥΣΗΣ:

2013

ΛΕΞΕΙΣ ΚΛΕΙΔΙΑ:

BIPV, FIT, Greenhouse Gas Emissions, Renewable Energy Sources, Roof Area Potential, Solar Energy, Technical Audits

Επιστημονικό Περιοδικό/Συνέδριο:

Journal of Energy and Power Engineering, Vol.7, pp.2211-2219

15 ΔΕΚΕΜΒΡΙΟΥ 2016

ΤΙΤΛΟΣ:

Comparing Recent Views of Public Attitude on Wind Energy, Photovoltaic and Small Hydro Applications

ΣΥΓΓΡΑΦΕΙΣ:

J.K. Kaldellis, M. Kapsali, El. Kaldelli, Ev. Katsanou

ΠΕΡΙΛΗΨΗ (ABSTRACT) ΔΗΜΟΣΙΕΥΣΗΣ

As renewable energy projects have gradually been introduced in various forms and in many places around the world, public skepticism on these developments has emerged and siting decisions have, in several cases, been determined by intense conflicts and debate. In this context, the present study focuses on the assessment of the levels of public acceptability for existing and new renewable energy projects, namely wind farms, small hydro and photovoltaics (PVs), in a representative region of Southern Greece. A point of particular interest in this survey is the adverse environmental conditions and poor air quality existing in the area under investigation, resulting from the long-term operation of a lignite-based thermal power station. A postal, three-part survey has been conducted based on a representative sample of local inhabitants. According to the results obtained, high levels of acceptability for existing and new projects have been encountered for all technologies examined. Interestingly, better results concerned PV applications, with the positive trend towards new projects being illustrated by the high percentage of about 85%. Similarly, wind and hydro energy applications demonstrate high acceptability of the order of 80%. Furthermore, local habitants\' experience on already operating renewable energy projects in the region has also designated their “tolerance” on the main environmental impacts of these technologies (visual, noise, land occupation etc.). However, this survey also reveals a specific minority of people that are opposed to renewable energy applications, either disregarding any environmental, social and financial benefits or just weighing benefits less heavily than the reasons of opposition.

ΕΤΟΣ ΔΗΜΟΣΙΕΥΣΗΣ:

2013

ΛΕΞΕΙΣ ΚΛΕΙΔΙΑ:

Renewable energy sources (RES), Questionnaires, Noise impact, Visual impact, Land usage, Environmental impacts

Επιστημονικό Περιοδικό/Συνέδριο:

Renewable Energy, Vol.52, pp.197-208

15 ΔΕΚΕΜΒΡΙΟΥ 2016

ΤΙΤΛΟΣ:

Photovoltaic-Based Combined Electricity and Clean Water Production for Remote Small Islands

ΣΥΓΓΡΑΦΕΙΣ:

Tiligadas D., Kondili E., Kaldellis J.K.

ΠΕΡΙΛΗΨΗ (ABSTRACT) ΔΗΜΟΣΙΕΥΣΗΣ

Most remote small islands of the Mediterranean area suffer from insufficient and high-cost electricity generation as well as significant water scarcity, considerably hindering the local development activities. The problem is much more pressing during the summer period due to the increased touristic activity. On the other hand, the entire Mediterranean region has significant solar potential, which is almost unexploited. In this context, the current paper investigates the opportunities of combined electricity and clean water production on the basis of the available solar potential. To that effect the currently proposed energy system comprising of photovoltaic (PV) generators and energy storage is combined with a small desalination unit. Actually, the maximization of the properly defined solar energy “value” is attempted on the basis of an appropriate allocation and planning of the PV generators either for covering directly the electrical demand of the local society or by providing the energy required for the seawater desalination process. According to the results obtained from the application of the proposed solution to a representative small Aegean Sea island, the production cost of both electricity and clean water through the desalination plant are favorably compared with the respective cost of the already existing electricity and water supply solutions.

ΕΤΟΣ ΔΗΜΟΣΙΕΥΣΗΣ:

2013

ΛΕΞΕΙΣ ΚΛΕΙΔΙΑ:

Stand-alone, Desalination, Energy autonomy, Solar potential

Επιστημονικό Περιοδικό/Συνέδριο:

Journal of Desalination and Water Treatment, Vol.51(4-6), pp. 695-701

15 ΔΕΚΕΜΒΡΙΟΥ 2016

ΤΙΤΛΟΣ:

A Multicriteria Analysis for the Optimal Desalination-RES System. Special focus: the Small Greek Islands

ΣΥΓΓΡΑΦΕΙΣ:

Kondili E., Kaldellis J.K., Paidousi M.

ΠΕΡΙΛΗΨΗ (ABSTRACT) ΔΗΜΟΣΙΕΥΣΗΣ

The coupling of renewable energy sources (RES) with desalination has the potential of providing a sustainable potable water source, especially in arid areas with limited water resources. During the design stage a RES–desalination process combination suitable for the particular application needs to be selected. The factors that should be considered for such a selection include the local RES potential, the compatibility of the desalination process with a certain renewable energy source, its effectiveness with respect to energy consumption, the amount of fresh water required in combination with the range of applicability of the various desalination processes, the seawater treatment requirements, the capital cost of the equipment, the land area required or could be made available for the installation of the system. The main aim of the present research is to find out how RES can optimally be combined with desalination technologies in small and medium size islands, through the development of a suitable selection methodology. To that effect a multicriteria analysis model is developed with special attention to the selection of the evaluation criteria and the weighting factors of these criteria in the final evaluation of the various alternative combinations of RES with desalination technologies. The criteria include technological, environmental, economic and location specific aspects of each alternative desalination–RES application scenario.

ΕΤΟΣ ΔΗΜΟΣΙΕΥΣΗΣ:

2013

ΛΕΞΕΙΣ ΚΛΕΙΔΙΑ:

Wind/PV/geothermal desalination, Reverse osmosis, Pair-wise criteria comparison, Aegean Sea islands

Επιστημονικό Περιοδικό/Συνέδριο:

Journal of Desalination and Water Treatment, Vol.51(4-6), pp. 1205-1218

15 ΔΕΚΕΜΒΡΙΟΥ 2016

ΤΙΤΛΟΣ:

Investigating the Energy Autonomy of Very Small Non-Interconnected Islands. A Case Study: Agathonisi, Greece

ΣΥΓΓΡΑΦΕΙΣ:

Kaldellis J.K., Gkikaki Ant., Kaldelli El., Kapsali M.

ΠΕΡΙΛΗΨΗ (ABSTRACT) ΔΗΜΟΣΙΕΥΣΗΣ

Increase in global energy demand, depletion of fossil fuels and environmental issues related to current major power generation patterns have proven to be highly effective drivers for a substantial shift towards renewable energy applications. Renewable energy sources (RES) such as wind, solar and biomass can provide reliable energy services and direct benefits at both national and local levels. Nowadays, in most non-interconnected islands the electricity generation cost is extremely high due to the utilization of outdated autonomous power stations (APSs) based on oil-fuel imports and diesel-electric generators. The objective of the present work is to investigate the possibility of achieving energy autonomy in very small (tiny) islands based exclusively on the use of RES. For that reason, a small Aegean Sea island (i.e. Agathonisi) which faces serious energy and water shortage problems is investigated. The proposed system configuration includes commercial wind turbines, photovoltaic panels, batteries and an internal combustion-electrical generator consuming biogas. The excess electricity is used for fresh water production via sea water desalination. Emphasis is given on a detailed energy analysis being the basis for sustainable development. The results obtained highlight the feasibility and competitiveness of the proposed system configuration in comparison to the current situation.

ΕΤΟΣ ΔΗΜΟΣΙΕΥΣΗΣ:

2012

ΛΕΞΕΙΣ ΚΛΕΙΔΙΑ:

Photovoltaics, Wind power, Solar radiation, Biogas, Desalination, Renewable energy islands

Επιστημονικό Περιοδικό/Συνέδριο:

Energy for Sustainable Development, Vol.16(4), pp.476¬485

15 ΔΕΚΕΜΒΡΙΟΥ 2016

ΤΙΤΛΟΣ:

Optimum wind- and photovoltaic-based stand-alone systems on the basis of life cycle energy analysis

ΣΥΓΓΡΑΦΕΙΣ:

Kaldellis J.K., Zafirakis, D., Stavropoulou V., Kaldelli El.

ΠΕΡΙΛΗΨΗ (ABSTRACT) ΔΗΜΟΣΙΕΥΣΗΣ

The main aim of the specific research is the comparison of the energy pay-back period of optimum renewable energy sources (RES)-based configurations, meaning wind-battery and photovoltaic-battery stand-alone installations that may ensure the energy autonomy of a typical remote consumer under the condition of minimum life cycle (LC) energy content. In this context, energy autonomy is first ensured on the basis of an appropriate sizing methodology, while accordingly, by developing a calculation algorithm for the estimation of the LC energy content of such energy autonomous systems, minimum LC embodied energy configurations are eventually obtained. On top of that, three representative areas are examined so as to investigate the influence of the local wind and solar potential. According to the results, the sustainable character of both RES-based solutions is designated, especially when comparison with the conventional diesel-engine solution is carried out. On the other hand, the situation is inversed when comparing stand-alone and grid-connected RES systems of the same size, with significant contribution of the battery storage component being reflected.

ΕΤΟΣ ΔΗΜΟΣΙΕΥΣΗΣ:

2012

ΛΕΞΕΙΣ ΚΛΕΙΔΙΑ:

Embodied energy, Solar energy, Wind energy

Επιστημονικό Περιοδικό/Συνέδριο:

Energy Policy, Vol.50, pp.345-357

15 ΔΕΚΕΜΒΡΙΟΥ 2016

ΤΙΤΛΟΣ:

Long-term evaluation of nitrogen oxides and sulphur dioxide emissions from the Greek lignite-based electricity generation sector

ΣΥΓΓΡΑΦΕΙΣ:

Kaldellis J.K., Kapsali M., Emmanouilidis M.

ΠΕΡΙΛΗΨΗ (ABSTRACT) ΔΗΜΟΣΙΕΥΣΗΣ

The Greek electricity generation system is mainly based on the operation of Lignite Thermal Power Stations (LTPSs). In this context, although electricity production from natural gas and renewable forms of energy has increased during recent years in Greece, dominant role of LTPSs is not expected to change dramatically in the near future. As a result, owed to the use of local lignite reserves (poor quality lignite), the Greek LTPSs are responsible for the production of significant flue gas emission quantities. Considering the above, this work is focused on investigating the corresponding long-term NOx and SO2 emissions due to lignite combustion (time period 1995-2008). At this point, it should be noted that although the 5.3GW installed capacity of the lignite-fired power plants represent roughly 40% of the national installed capacity, they are responsible for the noteworthy amounts of 60% and 15% of SO2 and NOx national emissions, respectively. To this end, estimation of SO2 and NOx emission factors is currently undertaken for each Greek LTPS, using available long-term official data. Subsequently, the estimated emission factors are used to classify the Greek LTPSs and evaluate their longterm environmental performance in relation with specific flue gas emissions. According to the results obtained, a clear decreasing rate of flue gases\' emissions (especially of NOx) is not the case during the time period analyzed, underlining the necessity for the implementation of effective abatement techniques in the next few years, in compliance with the country\'s commitments -as an EU Member Stateunder the corresponding environmental legislation.

ΕΤΟΣ ΔΗΜΟΣΙΕΥΣΗΣ:

2012

ΛΕΞΕΙΣ ΚΛΕΙΔΙΑ:

Air pollutant production, Electricity generation, Emission factors, Fossil fuels

Επιστημονικό Περιοδικό/Συνέδριο:

Fresenius Environmental Bulletin, Vol.21(9), F-2012-197

15 ΔΕΚΕΜΒΡΙΟΥ 2016

ΤΙΤΛΟΣ:

Multicriteria Analysis of Municipal Solid Wastes Energy Recovery Technologies in Greece

ΣΥΓΓΡΑΦΕΙΣ:

Kondili E., Bartzis I., Kapsali M., Kaldellis J.K.

ΠΕΡΙΛΗΨΗ (ABSTRACT) ΔΗΜΟΣΙΕΥΣΗΣ

Municipal Solid Waste (MSW) management is the field of science which explores and evolves strategies minimizing the final amount of wastes delivered to landfills and reducing the corresponding pollution related to all stages of treatment and collection. In the best practices of MSW the inherent energy of wastes is being recovered. In this study, the most appropriate energy recovery methods utilizing MSW for Greece (i.e. Sorting plant at landfill site with biogas recovery and RDF production, Incineration of MSW with small pre-treatment and Controlled landfill site with biogas recovery) are investigated based on the composition of wastes, the compatibility of the methods with the EU legislation, their technical availability, energy recovery capacity and contribution to the national energy balance, as well as economic issues, the maturity of the technologies involved and the land occupation requirements. A detailed multi-criteria analysis is applied considering the expected MSW production of Greece until 2020 along with different scenarios of waste utilization. Based on the results obtained, as well as on the elaboration of a sensitivity analysis, the \"Controlled landfill\" method is designated as the most prevalent energy recovery method for Greece, although under specific prioritization of the main parameters involved, the \"Incineration\" may be equally appropriate as well. Copyright© 2012 Global NEST Printed in Greece. All rights reserved.

ΕΤΟΣ ΔΗΜΟΣΙΕΥΣΗΣ:

2012

ΛΕΞΕΙΣ ΚΛΕΙΔΙΑ:

Controlled landfill sites, Energy recovery from MSW, Incineration of MSW, Sorting plant at landfill site, Waste-to-energy plants

Επιστημονικό Περιοδικό/Συνέδριο:

Global NEST Journal, Vol.14(2), pp.225-234