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Mr. Panagiotis Kontaxis
University of West Attica

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0 Lighting Control
0 Lighting Design
0 Lighting Retrofits
0 Photometry
0 lighting technology

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Journal article
Published: 05 December 2020 in Computers
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The progress of embedded control systems in the last several years has made possible the realization of highly-effective controllers in many domains. It is essential for such systems to provide effective performance at an affordable cost. Furthermore, real-time embedded control systems must have low energy consumption, as well as be reliable and timely. This research investigates primarily the feasibility of implementing an embedded real-time control system, based on a low-cost, commercially off-the-shelf (COTS) microcontroller platform. It explores real-time issues, such as the reliability and timely response, of such a system implementation. This work presents the development and performance evaluation of a novel real-time control architecture, based upon a BeagleBoard microcontroller, and applied into the PWM (pulse width modulation) control of a three-phase induction motor in a suction pump. The approach followed makes minimal use of general-purpose hardware (BeagleBone Black microcontroller board) and open-source software components (including Linux Operating System with PREEMPT_RT real-time support) for building a reliable real-time control system. The applicability of the proposed control system architecture is validated and evaluated in a real case study in manufacturing. The results provide sufficient evidence of the efficiency and reliability of the proposed approach into the development of a real-time control system based upon COTS components.

ACS Style

George K. Adam; Nikos Petrellis; Panagiotis A. Kontaxis; Tilemachos Stylianos. COTS-Based Real-Time System Development: An Effective Application in Pump Motor Control. Computers 2020, 9, 97 .

AMA Style

George K. Adam, Nikos Petrellis, Panagiotis A. Kontaxis, Tilemachos Stylianos. COTS-Based Real-Time System Development: An Effective Application in Pump Motor Control. Computers. 2020; 9 (4):97.

Chicago/Turabian Style

George K. Adam; Nikos Petrellis; Panagiotis A. Kontaxis; Tilemachos Stylianos. 2020. "COTS-Based Real-Time System Development: An Effective Application in Pump Motor Control." Computers 9, no. 4: 97.

Journal article
Published: 23 October 2020 in Energies
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A lot of autonomous power systems have been designed and operated with different power levels and with special requirements for climatic conditions, availability, operation/maintenance cost, fuel consumption, environmental impacts, etc. In this paper a novel design of an autonomous power system with photovoltaic panels and electrochemical batteries for a shoreline electrode station is analyzed. This station will be constructed on the small island of Stachtoroi for the new high voltage direct current (HVDC) link of Attica–Crete in Greece. The general guidelines of the International Council on Large Electric Systems (CIGRE) and of the International Electrotechnical Committee (IEC) for the power system of lighting and auxiliary loads for these HVDC stations are supplied from the medium voltage or the low voltage distribution network, whereas they do not take into account the criticality of this interconnection, which will practically be the unique power facility of Crete island. The significance of Crete power system interconnection demands an increased reliability level for the power sources, similar to military installations and hospital surgeries. In this research a basic electrical installation design methodology is presented. First, the autonomous photovoltaic power system with the energy storage system (ESS) consisting of electrochemical batteries is preliminary designed according to the relative bibliography. The station power and energy consumption are analytically determined taking into consideration the daily temperature variation annually. Afterwards, a techno-economic optimization process based on a sensitivity analysis is formed modifying the size/power of photovoltaic panels (PVs), the type and the energy capacity of the batteries taking into consideration the operation cycle of PVs—batteries charge and discharge and the battery ageing based on the relationship between battery cycles—the depth of discharge, the daily solar variation per month, the installation cost of PVs and batteries, the respective maintenance cost, etc., while the reliability criteria of expected loss of load power and of load energy are satisfied. Using the proposed methodology the respective results are significantly improved in comparison with the preliminary autonomous power system design or the connection with the distribution power system.

ACS Style

Panagiota M. Deligianni; George J. Tsekouras; Costas D. Tsirekis; Vassiliki T. Kontargyri; Fotis D. Kanellos; Panagiotis A. Kontaxis. 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. Energies 2020, 13, 5550 .

AMA Style

Panagiota M. Deligianni, George J. Tsekouras, Costas D. Tsirekis, Vassiliki T. Kontargyri, Fotis D. Kanellos, Panagiotis A. Kontaxis. 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. Energies. 2020; 13 (21):5550.

Chicago/Turabian Style

Panagiota M. Deligianni; George J. Tsekouras; Costas D. Tsirekis; Vassiliki T. Kontargyri; Fotis D. Kanellos; Panagiotis A. Kontaxis. 2020. "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." Energies 13, no. 21: 5550.

Journal article
Published: 04 August 2020 in Energies
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Daylight utilization significantly contributes to energy savings in office buildings. However, daylight integration requires careful design so as to include variations in daylight availability and maintain a balance between factors such as lighting quality and heat gain or loss. Designers with proper planning can not only improve the visual environment and create higher-quality spaces, but simultaneously minimize energy costs for buildings. The utilization of photosensors can exploit the benefits of daylighting by dimming the lighting system, so that no excessive luminous flux is produced, thus leading to energy savings as well as visual contentment. However, the human factor is crucial for the proper function of a lighting control system. Without its acceptance from the users, energy savings can be minimized or even negligible. The objective of this paper is to present a post-occupancy evaluation regarding occupant satisfaction and acceptance in relation to daylighting in offices equipped with automated daylight controls. In addition, the response of the users was compared with lighting measurements that were performed during the post-occupancy evaluation. Three case studies of office buildings with installed daylight-harvesting systems were examined. The age of the occupants was a crucial factor concerning their satisfaction in relation to the lighting levels. Aged users were more comfortable with lighting levels over 500lx, while young users were satisfied with 300lx. The impact of different control algorithms was outlined, with the integral reset algorithm performing poorly. The acceptance of the users for the closed loop systems maintained the expected energy savings of the daylight harvesting technique. Most of the occupants preferred to use daylight as a light source combined with artificial light but having the control to either override or switch it on and off at will. The results shown that a post-occupancy survey along with lighting measurements are significant for making an office environment a humancentric one.

ACS Style

Lambros T. Doulos; Aris Tsangrassoulis; Evangelos-Nikolaos Madias; Spyros Niavis; Antonios Kontadakis; Panagiotis A. Kontaxis; Vassiliki T. Kontargyri; Katerina Skalkou; Frangiskos Topalis; Evangelos Manolis; Maro Sinou; Stelios Zerefos. Examining the Impact of Daylighting and the Corresponding Lighting Controls to the Users of Office Buildings. Energies 2020, 13, 4024 .

AMA Style

Lambros T. Doulos, Aris Tsangrassoulis, Evangelos-Nikolaos Madias, Spyros Niavis, Antonios Kontadakis, Panagiotis A. Kontaxis, Vassiliki T. Kontargyri, Katerina Skalkou, Frangiskos Topalis, Evangelos Manolis, Maro Sinou, Stelios Zerefos. Examining the Impact of Daylighting and the Corresponding Lighting Controls to the Users of Office Buildings. Energies. 2020; 13 (15):4024.

Chicago/Turabian Style

Lambros T. Doulos; Aris Tsangrassoulis; Evangelos-Nikolaos Madias; Spyros Niavis; Antonios Kontadakis; Panagiotis A. Kontaxis; Vassiliki T. Kontargyri; Katerina Skalkou; Frangiskos Topalis; Evangelos Manolis; Maro Sinou; Stelios Zerefos. 2020. "Examining the Impact of Daylighting and the Corresponding Lighting Controls to the Users of Office Buildings." Energies 13, no. 15: 4024.

Original paper
Published: 02 June 2020 in Operational Research
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Lighting corresponds to a significant amount of a building’s total energy consumption, hence a variety of alternatives exist so as to minimize the energy consumption used for lighting such as the installation of energy efficient light sources and the exploitation of lighting controls and more significantly daylight harvesting. The position of an ambient light sensor that adjusts artificial lighting according to daylight levels is a key factor that affects the operation of any daylight harvesting system. This paper presents a multicriteria decision aid method to find the optimal position for the installation of an ambient light sensor, thus optimizing the performance of daylight exploitation system. Three criteria are proposed namely visual comfort, energy saving and the coefficient of correlation between the illuminance on the working plane and the illuminance perceived by the sensor on the ceiling. The multicriteria method PROMETHEE II is applied so as to evaluate 30 alternative positions and deduce the optimal one in an office room. The proposed methodology is flexible and highly customizable and can contribute significantly to the efficient commissioning of any daylight harvesting system.

ACS Style

Evangelos-Nikolaos D. Madias; Lambros T. Doulos; Panagiotis A. Kontaxis; Frangiskos V. Topalis. Multicriteria decision aid analysis for the optimum performance of an ambient light sensor: methodology and case study. Operational Research 2020, 1 -29.

AMA Style

Evangelos-Nikolaos D. Madias, Lambros T. Doulos, Panagiotis A. Kontaxis, Frangiskos V. Topalis. Multicriteria decision aid analysis for the optimum performance of an ambient light sensor: methodology and case study. Operational Research. 2020; ():1-29.

Chicago/Turabian Style

Evangelos-Nikolaos D. Madias; Lambros T. Doulos; Panagiotis A. Kontaxis; Frangiskos V. Topalis. 2020. "Multicriteria decision aid analysis for the optimum performance of an ambient light sensor: methodology and case study." Operational Research , no. : 1-29.

Original paper
Published: 20 April 2019 in Operational Research
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The necessity for energy saving in lighting leads to installation of new energy efficient light sources, especially LED luminaires. Although solid state lighting is considered the dominant lighting technology for the future there exist no concrete methods to evaluate LED luminaires and decide the optimal one for each lighting application. Multicriteria decision methods are utilized in various decision problems so as to evaluate alternatives through complex and conflicting criteria. This paper introduces a decision support system for a complete techno-economic evaluation of LED luminaires through multicriteria analysis. Seven criteria are proposed so as to assess the technical and economic characteristics of LED luminaires and ensure their compliance with European Norms regarding office lighting. Laboratory measurements and lighting calculations in 8 indoor types of LED luminaires are performed so as to define their technical characteristics and evaluate their performance concerning the lighting of an office. Finally, the PROMETHEE II multicriteria method is applied, which ranks the 8 types of luminaires and determines the optimal one. The proposed decision support system can be applied to any type of luminaire and can be used by professionals who want to evaluate different luminaire suppliers and determine the optimal luminaire tender for the lighting of any indoor space.

ACS Style

Evangelos-Nikolaos D. Madias; Lambros T. Doulos; Panagiotis A. Kontaxis; Frangiskos V. Topalis. A decision support system for techno-economic evaluation of indoor lighting systems with LED luminaires. Operational Research 2019, 21, 1403 -1422.

AMA Style

Evangelos-Nikolaos D. Madias, Lambros T. Doulos, Panagiotis A. Kontaxis, Frangiskos V. Topalis. A decision support system for techno-economic evaluation of indoor lighting systems with LED luminaires. Operational Research. 2019; 21 (2):1403-1422.

Chicago/Turabian Style

Evangelos-Nikolaos D. Madias; Lambros T. Doulos; Panagiotis A. Kontaxis; Frangiskos V. Topalis. 2019. "A decision support system for techno-economic evaluation of indoor lighting systems with LED luminaires." Operational Research 21, no. 2: 1403-1422.

Journal article
Published: 01 January 2019 in Electronics
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Although with the advent of the LEDs the energy consumption in buildings can be reduced by 50%, there exists a potential for energy savings due to lighting controls. Moreover, lighting controls can ensure that the near zero energy requirements by EU can be achieved for near zero energy buildings (nZEBs). For this reason, more sophisticated lighting controls must be proposed in order to take full advantage of LEDs and their flexibility concerning dimming. This paper proposes the architecture of an embedded computer camera controller for monitoring and management of image data, which is applied in various control cases, and particularly in digitally controlled lighting devices. The proposed system deals with real-time monitoring and management of a GigE camera input. An in-house developed algorithm using MATLAB enables the identification of areas in luminance values. The embedded microcontroller is part of a complete lighting control system with an imaging sensor in order to measure and control the illumination of several working areas of a room. The power consumption of the proposed lighting system was measured and was compared with the power consumption of a typical photosensor. The functional performance and operation of the proposed camera control system architecture was evaluated based upon a BeagleBone Black microcontroller board.

ACS Style

George K. Adam; Panagiotis A. Kontaxis; Lambros T. Doulos; Evangelos-Nikolaos D. Madias; Constantinos A. Bouroussis; Frangiskos V. Topalis. Embedded Microcontroller with a CCD Camera as a Digital Lighting Control System. Electronics 2019, 8, 33 .

AMA Style

George K. Adam, Panagiotis A. Kontaxis, Lambros T. Doulos, Evangelos-Nikolaos D. Madias, Constantinos A. Bouroussis, Frangiskos V. Topalis. Embedded Microcontroller with a CCD Camera as a Digital Lighting Control System. Electronics. 2019; 8 (1):33.

Chicago/Turabian Style

George K. Adam; Panagiotis A. Kontaxis; Lambros T. Doulos; Evangelos-Nikolaos D. Madias; Constantinos A. Bouroussis; Frangiskos V. Topalis. 2019. "Embedded Microcontroller with a CCD Camera as a Digital Lighting Control System." Electronics 8, no. 1: 33.

Journal article
Published: 01 August 2016 in Energy and Buildings
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ACS Style

Evangelos-Nikolaos D. Madias; Panagiotis A. Kontaxis; Frangiskos V. Topalis. Application of multi-objective genetic algorithms to interior lighting optimization. Energy and Buildings 2016, 125, 66 -74.

AMA Style

Evangelos-Nikolaos D. Madias, Panagiotis A. Kontaxis, Frangiskos V. Topalis. Application of multi-objective genetic algorithms to interior lighting optimization. Energy and Buildings. 2016; 125 ():66-74.

Chicago/Turabian Style

Evangelos-Nikolaos D. Madias; Panagiotis A. Kontaxis; Frangiskos V. Topalis. 2016. "Application of multi-objective genetic algorithms to interior lighting optimization." Energy and Buildings 125, no. : 66-74.