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12 results on '"Kontaxis, Panagiotis A."'

4. Alternative Simplified Analytical Models for the Electric Field, in Shoreline Pond Electrode Preliminary Design, in the Case of HVDC Transmission Systems

Author

Tsekouras, George J., primary, Kontargyri, Vassiliki T., additional, Prousalidis, John M., additional, Kanellos, Fotios D., additional, Tsirekis, Constantinos D., additional, Leontaritis, Konstantinos, additional, Alexandris, John C., additional, Deligianni, Panagiota M., additional, Kontaxis, Panagiotis A., additional, and Moronis, Antonios X., additional

Published
2022
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5. Comparison of Different Configurations for Shoreline Pond Electrode Station for HVDC Transmission Systems—Part I: Electric Field Study for Frames of Linear Electrode Arrangement Based on a Simplified Analytical Model.

Author

Kontargyri, Vassiliki T., Tsekouras, George J., Prousalidis, John M., Tsirekis, Costantinos D., Leontaritis, Konstantinos, Alexandris, John C., Kanellos, Fotis D., Deligianni, Panagiota M., Kontaxis, Panagiotis A., and Moronis, Antonios X.

Subjects
ELECTRIC fields, ELECTRIC field effects, SHORELINES, ELECTRODES, SOLAR ponds, PONDS
Abstract

Featured Application: The present paper evaluates 10 alternative shoreline pond electrode station designs using frames in a linear arrangement of electrodes for HVDC interconnections, against the typical design, according to CIGRE B4.61/2017 (parallel arrangement of electrode frames, with respect to the longitudinal axis of the breakwater), studying it from the point of view of electric field analysis (with emphasis on the near-field). During the design of a shoreline electrode station for High-Voltage Direct Current (HVDC) interconnections, the location of the electrodes plays a critical part, especially in the development of the near-electric field. The basic structure is their linear placement, in the form of successive frames, parallel to the longitudinal axis of the breakwater, as proposed by CIGRE and implemented in existing projects. However, this arrangement requires a considerable breakwater length, which may not be permissible, as in the case of Stachtoroi, one of the two electrode stations being built for the 1 GW, ±500 kV HVDC interconnection between Crete and mainland Greece. This troubled the preliminary study team of the electrode stations, which investigated other possible configurations. In this paper, configurations of linear placements of electrode frames are studied and compared at the preliminary study level in terms of electric field effects (especially the near-field), using an analytical simplified model and the superposition method, to determine the most appropriate arrangement of electrodes that will cover the respective requirements of CIGRE directives B4.61/2017. These arrangements are practically evaluated for two different electrode station locations at Korakia in Crete and at Stachtoroi in Aegina for the Crete–mainland-Greece interconnection, resulting in interesting alternative solutions. [ABSTRACT FROM AUTHOR]

Published
2023
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6. Microbial Fuel Cell for Wastewater Treatment as Power Plant in Smart Grids: Utopia or Reality?

Author

Tsekouras, George J., Deligianni, Panagiota M., Kanellos, Fotis D., Kontargyri, Vassiliki T., Kontaxis, Panagiotis A., Manousakis, Nikolaos M., and Elias, Charalambos N.

Subjects
Economics and Econometrics, Fuel Technology, Renewable Energy, Sustainability and the Environment, Energy Engineering and Power Technology
Abstract

Microbial fuel cells (MFCs) have undergone great technological development in the last 20 years, but very little has been done to commercialize them. The simultaneous power production and wastewater treatment are features those greatly increase the interest in the use of MFCs. This kind of distributed power generation is renewable and friendly and can be easily integrated into a smart grid. However, there are some key issues with their commercialization: high construction costs, difficulty in developing high power structures, MFC lifespan, and maintaining a high level of efficiency. The objective of this article is to explore the possibilities of using MFCs in urban wastewater not only regarding the technical criteria of their application, but also mainly from an economic point of view, to determine the conditions through which the viability of the investment is ensured and the possibilities of their integration in a smart grid are identified. Initially, this article explores the implementation/configuration of a power plant with MFCs within an urban wastewater treatment plant on a theoretical basis. In addition, based on the corresponding physical quantities for urban wastewater treatment, the construction and operational costs are determined and the viability of the investment is examined based on classic economic criteria such as net present value, benefit–cost ratio, internal rate of return, and discounted payback period. Furthermore, sensitivity analysis is carried out, concerning both technical parameters, such as the percentage of organic matter removal, power density, sewage residence time, MFC efficiency, etc., and economical parameters, such as the reduction of construction costs due to change of materials, change of interest rate, and lifetime. The advantages and disadvantages of their use in smart grids is also analyzed. The results show that the use of MFCs for power generation cannot be utopian as long as they are integrated into the structure of a central wastewater treatment plant on the condition that the scale-up technical issues of MFCs are successfully addressed.

Published
2022

8. Techno-Economic Optimization Analysis of an Autonomous Photovoltaic Power System for a Shoreline Electrode Station of HVDC Link: Case Study of an Electrode Station on the Small Island of Stachtoroi for the Attica–Crete Interconnection

Author

Deligianni, Panagiota M., primary, Tsekouras, George J., additional, Tsirekis, Costas D., additional, Kontargyri, Vassiliki T., additional, Kanellos, Fotis D., additional, and Kontaxis, Panagiotis A., additional

Published
2020
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9. Examining the Impact of Daylighting and the Corresponding Lighting Controls to the Users of Office Buildings

Author

Doulos, Lambros T., primary, Tsangrassoulis, Aris, additional, Madias, Evangelos-Nikolaos, additional, Niavis, Spyros, additional, Kontadakis, Antonios, additional, Kontaxis, Panagiotis A., additional, Kontargyri, Vassiliki T., additional, Skalkou, Katerina, additional, Topalis, Frangiskos, additional, Manolis, Evangelos, additional, Sinou, Maro, additional, and Zerefos, Stelios, additional

Published
2020
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