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Prof. Tassos Stamatelos
University of Thessaly

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Research Keywords & Expertise

0 Building energy performance
0 Engines
0 Exhaust after-tratment technology
0 Energy Alternative
0 Photovoltaic Engineering

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Journal article
Published: 31 January 2021 in Energies
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The use of air source heat pump systems for space heating and cooling is a convenient retrofitting strategy for reducing building energy costs. This can be combined with the rooftop installation of photovoltaic panels, which can cover, to a significant degree—or even significantly exceed the building’s electricity needs, moving towards the zero energy building concept. Alternatively, increased capacity for rooftop photovoltaic (PV) installation may support the ongoing process of transforming the Greek power system away from the reliance on fossil fuels to potentially become one of the leaders of the energy transition in Europe by 2030. Standard building energy simulation tools allow good assessment of the Heating, Ventilation and Air Conditioning (HVAC) and PV systems’ interactions in transient operation. Further, their use enables the rational sizing and selection of the type of panels type for the rooftop PV installation to maximize the return on investment. The annual performance of a three-zone residential building in Volos, Greece, with an air-to-water heat pump HVAC system and a rooftop PV installation, are simulated in a TRNSYS environment. The simulation results are employed to assess the expected building energy performance with a high performance, inverter driven heat pump with scroll compressor and high efficiency rooftop PV panels. Further, the objective functions are developed for the optimization of the installed PV panels’ area and tilt angle, based on alternative electricity pricing and subsidies. The methodology presented can be adapted to optimize system design parameters for variable electricity tariffs and improve net metering policies.

ACS Style

George Stamatellos; Olympia Zogou; Anastassios Stamatelos. Energy Performance Optimization of a House with Grid-Connected Rooftop PV Installation and Air Source Heat Pump. Energies 2021, 14, 740 .

AMA Style

George Stamatellos, Olympia Zogou, Anastassios Stamatelos. Energy Performance Optimization of a House with Grid-Connected Rooftop PV Installation and Air Source Heat Pump. Energies. 2021; 14 (3):740.

Chicago/Turabian Style

George Stamatellos; Olympia Zogou; Anastassios Stamatelos. 2021. "Energy Performance Optimization of a House with Grid-Connected Rooftop PV Installation and Air Source Heat Pump." Energies 14, no. 3: 740.

Journal article
Published: 18 December 2020 in Energies
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The motivation for this paper is the enhanced role of power generation prediction in power plants and power systems in the smart grid paradigm. The proposed approach addresses the impact of the ambient temperature on the performance of an open cycle gas turbine when using the Kalman Filter (KF) technique and the power-temperature (P-T) characteristic of the turbine. Several Kalman Filtering techniques are tested to obtain improved temperature forecasts, which are then used to obtain output power predictions. A typical P-T curve of an open-cycle gas turbine is used to demonstrate the applicability of the proposed method. Nonlinear and linear discrete process models are studied. Extended Kalman Filters are proposed for the nonlinear model. The Time Varying, Time Invariant, and Steady State Kalman Filters are used with the linearized model. Simulation results show that the power generation prediction obtained using the Extended Kalman Filter with the piecewise linear model yields improved forecasts. The linear formulations, though less accurate, are a promising option when a power generation forecast for a small-term and short-term time window is required.

ACS Style

Christos Manasis; Nicholas Assimakis; Vasilis Vikias; Aphrodite Ktena; Tassos Stamatelos. Power Generation Prediction of an Open Cycle Gas Turbine Using Kalman Filter. Energies 2020, 13, 6692 .

AMA Style

Christos Manasis, Nicholas Assimakis, Vasilis Vikias, Aphrodite Ktena, Tassos Stamatelos. Power Generation Prediction of an Open Cycle Gas Turbine Using Kalman Filter. Energies. 2020; 13 (24):6692.

Chicago/Turabian Style

Christos Manasis; Nicholas Assimakis; Vasilis Vikias; Aphrodite Ktena; Tassos Stamatelos. 2020. "Power Generation Prediction of an Open Cycle Gas Turbine Using Kalman Filter." Energies 13, no. 24: 6692.

Journal article
Published: 11 January 2020 in Sustainability
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A large number of grid-connected Photovoltaic parks of different scales have been operating worldwide for more than two decades. Systems’ performance varies with time, and an important factor that influences PV performance is dust and ambient aerosols. Dust accumulation has significant effects depending the region, and—on the other hand—understanding the role of absorption or scattering in particular wavelengths from aerosols is a challenging task. This paper focuses on performance analysis of a grid-connected PV system in Central Greece, aiming to study these effects. The methodology of analysis follows three directions, namely, PR computations, use of mathematical model’s prediction as reference value, and normalized efficiency calculation. These metrics are correlated with the levels of dust accumulation on PV panels’ surfaces and the ambient aerosol mass concentration. The results show that only heavily soiled surfaces have significant impact on PV performance and, particularly, a decrease of 5.6%. On the other hand, light or medium soiling have negligible impact on PV performance. On the other hand, the impact of ambient aerosol concentration levels on PV efficiency is more complex and requires further study. Aerosol scattering of different wavelengths can possibly affect PV efficiency, however, this fact may be related to the specific spectral response of PV cells.

ACS Style

Elias Roumpakias; Tassos Stamatelos. Surface Dust and Aerosol Effects on the Performance of Grid-Connected Photovoltaic Systems. Sustainability 2020, 12, 569 .

AMA Style

Elias Roumpakias, Tassos Stamatelos. Surface Dust and Aerosol Effects on the Performance of Grid-Connected Photovoltaic Systems. Sustainability. 2020; 12 (2):569.

Chicago/Turabian Style

Elias Roumpakias; Tassos Stamatelos. 2020. "Surface Dust and Aerosol Effects on the Performance of Grid-Connected Photovoltaic Systems." Sustainability 12, no. 2: 569.

Journal article
Published: 22 May 2019 in Energies
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The application of biodiesel blends is known to significantly affect operation of diesel-injection equipment, especially the injectors and fuel pump. This paper summarizes experience on this subject from burning fuel blends with high-percentages of biodiesel (up to 70%) on a common-rail, high-pressure-injection diesel engine and a conventional DI engine. Both engines were unable to start after running for 100 h each and staying shut off for more than two months. In order to understand the wear characteristics of the injector nozzle, pump pistons, and elastomer parts (in the case of the high-pressure pump of the common-rail engine), due to the prolonged operation with high-percentage biodiesel blends, their injectors and pumps parts were examined and compared by performing normal photography and low magnification microscopy. Additionally, the various elastomer parts of the high-pressure fuel pump of the common-rail engine were examined for wear and deterioration. The results are compared with existing literature results from other researchers. The observed deterioration of diesel-injection equipment is caused by use of high-percentage biodiesel blends and subsequent engine shut down.

ACS Style

Dimitrios Tziourtzioumis; Anastassios M. Stamatelos. Diesel-Injection Equipment Parts Deterioration after Prolonged Use of Biodiesel. Energies 2019, 12, 1953 .

AMA Style

Dimitrios Tziourtzioumis, Anastassios M. Stamatelos. Diesel-Injection Equipment Parts Deterioration after Prolonged Use of Biodiesel. Energies. 2019; 12 (10):1953.

Chicago/Turabian Style

Dimitrios Tziourtzioumis; Anastassios M. Stamatelos. 2019. "Diesel-Injection Equipment Parts Deterioration after Prolonged Use of Biodiesel." Energies 12, no. 10: 1953.

Journal article
Published: 07 May 2019 in Energies
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The introduction of modern aftertreatment systems in marine diesel engines call for accurate prediction of exhaust gas temperature, since it significantly affects the performance of the aftertreatment system. The scavenging process establishes the initial conditions for combustion, directly affecting exhaust gas temperature, fuel economy, and emissions. In this paper, a semi-empirical zero-dimensional three zone scavenging model applicable to two-stroke uniflow scavenged diesel engines is updated using the results of CFD (computational fluid dynamics) simulations. In this 0-D model, the engine cylinders are divided in three zones (thermodynamic control volumes) namely, the pure air zone, mixing zone, and pure exhaust gas zone. The entrainment of air and exhaust gas in the mixing zone is specified by time varying mixing coefficients. The mixing coefficients were updated using results from CFD simulations based on the geometry of a modern 50 cm bore large two-stroke marine diesel engine. This increased the model’s accuracy by taking into account 2-D fluid dynamics phenomena in the cylinder ports and exhaust valve. Thus, the effect of engine load, inlet port swirl angle and partial covering of inlet ports on engine scavenging were investigated. The three-zone model was then updated and the findings of CFD simulations were reflected accordingly in the updated mixing coefficients of the scavenging model.

ACS Style

Michael I. Foteinos; Alexandros Papazoglou; Nikolaos P. Kyrtatos; Anastassios Stamatelos; Olympia Zogou; Antiopi-Malvina Stamatellou. A Three-Zone Scavenging Model for Large Two-Stroke Uniflow Marine Engines Using Results from CFD Scavenging Simulations. Energies 2019, 12, 1719 .

AMA Style

Michael I. Foteinos, Alexandros Papazoglou, Nikolaos P. Kyrtatos, Anastassios Stamatelos, Olympia Zogou, Antiopi-Malvina Stamatellou. A Three-Zone Scavenging Model for Large Two-Stroke Uniflow Marine Engines Using Results from CFD Scavenging Simulations. Energies. 2019; 12 (9):1719.

Chicago/Turabian Style

Michael I. Foteinos; Alexandros Papazoglou; Nikolaos P. Kyrtatos; Anastassios Stamatelos; Olympia Zogou; Antiopi-Malvina Stamatellou. 2019. "A Three-Zone Scavenging Model for Large Two-Stroke Uniflow Marine Engines Using Results from CFD Scavenging Simulations." Energies 12, no. 9: 1719.

Journal article
Published: 08 April 2019 in Renewable Energy
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The growth of renewable energy and especially photovoltaic energy in Greece is remarkable. There exist many grid-connected systems in Greek territory which have completed ten years operation. A challenging task for these systems is performance analysis, investigation of possible degradation in systems efficiency and formulation of a detailed solar potential record for each region. This paper focuses in the performance of a grid-connected PV system in central Greece which has completed six years’ operation. The analysis methodology is based on three axes. The first is a calculation of the daily PR and yearly PR and their comparison for the 6 years of operation. The daily PR is further correlated with the averaged clearness index in order to assess the atmospheric effect on the PV performance. The second axis involves the application of a mathematic model, which describes PV power, to the available data. Computed values act as the reference values and deviation of the measured values thereof hint to probable changes in PV system performance. The third axis involves the computation of normalized efficiency to STC conditions. This includes (i) the computation of DC power from available AC data and inverters’ efficiency, (ii) temperature normalization according to the temperature coefficients of manufacturer and (iii) comparison of efficiency at various weather conditions and computation of yearly average values, respectively, with Airmass. The analysis results hint to a small performance deterioration over the years, with degradation rates ranging from 1-4%.

ACS Style

Elias Roumpakias; Anastassios Stamatelos. Performance analysis of a grid-connected photovoltaic park after 6 years of operation. Renewable Energy 2019, 141, 368 -378.

AMA Style

Elias Roumpakias, Anastassios Stamatelos. Performance analysis of a grid-connected photovoltaic park after 6 years of operation. Renewable Energy. 2019; 141 ():368-378.

Chicago/Turabian Style

Elias Roumpakias; Anastassios Stamatelos. 2019. "Performance analysis of a grid-connected photovoltaic park after 6 years of operation." Renewable Energy 141, no. : 368-378.

Journal article
Published: 01 October 2017 in Applied Thermal Engineering
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ACS Style

Apostolos A. Gkountas; Anastassios Stamatelos; Anestis Kalfas. Recuperators investigation for high temperature supercritical carbon dioxide power generation cycles. Applied Thermal Engineering 2017, 125, 1094 -1102.

AMA Style

Apostolos A. Gkountas, Anastassios Stamatelos, Anestis Kalfas. Recuperators investigation for high temperature supercritical carbon dioxide power generation cycles. Applied Thermal Engineering. 2017; 125 ():1094-1102.

Chicago/Turabian Style

Apostolos A. Gkountas; Anastassios Stamatelos; Anestis Kalfas. 2017. "Recuperators investigation for high temperature supercritical carbon dioxide power generation cycles." Applied Thermal Engineering 125, no. : 1094-1102.

Journal article
Published: 01 October 2017 in Energy Conversion and Management
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ACS Style

Elias Roumpakias; Anastassios Stamatelos. Comparative performance analysis of grid-connected photovoltaic system by use of existing performance models. Energy Conversion and Management 2017, 150, 14 -25.

AMA Style

Elias Roumpakias, Anastassios Stamatelos. Comparative performance analysis of grid-connected photovoltaic system by use of existing performance models. Energy Conversion and Management. 2017; 150 ():14-25.

Chicago/Turabian Style

Elias Roumpakias; Anastassios Stamatelos. 2017. "Comparative performance analysis of grid-connected photovoltaic system by use of existing performance models." Energy Conversion and Management 150, no. : 14-25.

Journal article
Published: 11 July 2017 in Energies
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Differences in the evolution of combustion in a single cylinder, DI (direct injection) diesel engine fuelled by B20 were observed upon processing of the respective indicator diagrams. Aiming to further investigate the effects of biodiesel on the engine injection and combustion process, the injection characteristics of B0, B20, B40, B60, B80 and B100 were measured at low injection pressure and visualized at low and standard injection pressures. The fuel atomization characteristics were investigated in terms of mean droplet velocity, Sauter mean diameter, droplet velocity and diameter distributions by using a spray visualization system and Laser Doppler Velocimetry. The jet break-up characteristics are mainly influenced by the Weber number, which is lower for biodiesel, mainly due to its higher surface tension. Thus, Sauter mean diameter (SMD) of sprays with biodiesel blended-fuel is higher. Volume mean diameter (VMD) and arithmetic mean diameter (AMD) values also increase with blending ratio. Kinematic viscosity and surface tension become higher as the biodiesel blending ratio increases. The SMD, VMD and AMD of diesel and biodiesel blended fuels decreased with an increase in the axial distance from spray tip. Comparison of estimated fuel burning rates for 60,000 droplets’ samples points to a decrease in mean fuel burning rate for B20 and higher blends.

ACS Style

Dimitrios Tziourtzioumis; Anastassios M Stamatelos. Experimental Investigation of the Effect of Biodiesel Blends on a DI Diesel Engine’s Injection and Combustion. Energies 2017, 10, 970 .

AMA Style

Dimitrios Tziourtzioumis, Anastassios M Stamatelos. Experimental Investigation of the Effect of Biodiesel Blends on a DI Diesel Engine’s Injection and Combustion. Energies. 2017; 10 (7):970.

Chicago/Turabian Style

Dimitrios Tziourtzioumis; Anastassios M Stamatelos. 2017. "Experimental Investigation of the Effect of Biodiesel Blends on a DI Diesel Engine’s Injection and Combustion." Energies 10, no. 7: 970.

Journal article
Published: 01 July 2017 in Applied Thermal Engineering
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ACS Style

Antiopi-Malvina Stamatellou; Anastassios Stamatelos. Overview of Diesel particulate filter systems sizing approaches. Applied Thermal Engineering 2017, 121, 537 -546.

AMA Style

Antiopi-Malvina Stamatellou, Anastassios Stamatelos. Overview of Diesel particulate filter systems sizing approaches. Applied Thermal Engineering. 2017; 121 ():537-546.

Chicago/Turabian Style

Antiopi-Malvina Stamatellou; Anastassios Stamatelos. 2017. "Overview of Diesel particulate filter systems sizing approaches." Applied Thermal Engineering 121, no. : 537-546.

Conference paper
Published: 26 June 2017 in Volume 2A: Turbomachinery
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Supercritical CO2 cycles is a promising technology for the next generation power conversion cycles. Supercritical CO2 Brayton cycles offer equivalent or higher cycle efficiency when compared with steam cycles at similar temperatures. This paper presents an investigation of the sCO2 recompression cycle, where recompressing a fraction of the flow without heat rejection, results in an increase in thermal efficiency. A thermodynamic analysis of a 600 MWth power cycle has been carried out, in order to study the effect of the most significant design parameters on the components performance and cycle efficiency, using two different simulation tools to model the recompression system. An iterative model using basic thermodynamic equations describing the system’s components was employed in this direction. The system was also modeled by means of commercial process modeling software for comparison. Hence, useful results regarding the operating pressures and temperatures of the cycle and how they affect the recuperators, the compressor and the turbine performance have been derived. Finally, a comparative analysis of the results of the two simulation tools and those of a reference cycle from the bibliography is carried out, showing deviations in the range of 2.8 to 4%.

ACS Style

Apostolos A. Gkountas; Anastassios Stamatelos; Anestis Kalfas. Thermodynamic Modeling and Comparative Analysis of Supercritical Carbon Dioxide Brayton Cycle. Volume 2A: Turbomachinery 2017, 1 .

AMA Style

Apostolos A. Gkountas, Anastassios Stamatelos, Anestis Kalfas. Thermodynamic Modeling and Comparative Analysis of Supercritical Carbon Dioxide Brayton Cycle. Volume 2A: Turbomachinery. 2017; ():1.

Chicago/Turabian Style

Apostolos A. Gkountas; Anastassios Stamatelos; Anestis Kalfas. 2017. "Thermodynamic Modeling and Comparative Analysis of Supercritical Carbon Dioxide Brayton Cycle." Volume 2A: Turbomachinery , no. : 1.

Journal article
Published: 01 February 2015 in Renewable Energy
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ACS Style

Elias Roumpakias; Olympia Zogou; Anastassios Stamatelos. Correlation of actual efficiency of photovoltaic panels with air mass. Renewable Energy 2015, 74, 70 -77.

AMA Style

Elias Roumpakias, Olympia Zogou, Anastassios Stamatelos. Correlation of actual efficiency of photovoltaic panels with air mass. Renewable Energy. 2015; 74 ():70-77.

Chicago/Turabian Style

Elias Roumpakias; Olympia Zogou; Anastassios Stamatelos. 2015. "Correlation of actual efficiency of photovoltaic panels with air mass." Renewable Energy 74, no. : 70-77.

Journal article
Published: 01 September 2014 in Journal of Energy Engineering
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This is an experimental and computational study of the effect of a low-percentage biodiesel blend on the operation, diesel filter loading, and fuel additive-assisted regeneration behavior on a conventional, direct injection (DI), single-cylinder diesel engine. The evolution of regeneration was studied by means of infrared thermography on the unit filter. The results of two sets of regeneration experiments, one for each fuel blend, with high-space velocity levels are discussed. The test fuels were conventional diesel (denoted as B0) and B20 biodiesel blend. The objective was to investigate the differences in catalytic soot ignition and regeneration propagation when the engine is fueled by biodiesel blend. The investigation is assisted by the application of an in-house diesel particulate filter (DPF) regeneration modeling tool. The results indicate a faster evolution of the regeneration with B20 fuel, with lower overall filter wall temperatures prevailing, more favorable on filter durability grounds.

ACS Style

Dimitrios Tziourtzioumis; Anastassios Stamatelos. Effects of B20 on the Operation of a Single-Cylinder Engine Equipped with a SiC Diesel Particulate Filter. Journal of Energy Engineering 2014, 140, 1 .

AMA Style

Dimitrios Tziourtzioumis, Anastassios Stamatelos. Effects of B20 on the Operation of a Single-Cylinder Engine Equipped with a SiC Diesel Particulate Filter. Journal of Energy Engineering. 2014; 140 (3):1.

Chicago/Turabian Style

Dimitrios Tziourtzioumis; Anastassios Stamatelos. 2014. "Effects of B20 on the Operation of a Single-Cylinder Engine Equipped with a SiC Diesel Particulate Filter." Journal of Energy Engineering 140, no. 3: 1.

Journal article
Published: 30 May 2014 in The Open Fuels & Energy Science Journal
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Higher education costs per graduating student are globally increasing to unsustainable levels, taking into account the worldwide economy problems. Electricity consumption is an essential part of university building operation costs. Thus, many universities struggle to reduce them. To succeed in the reduction of electricity consumption in public buildings, it is essential to detect, identify and classify different kinds of consumption exceedance modes in the electricity consumption time series as early as possible. Intelligent diagnosis and prognosis has already become an important field of interest in engineering. This paper presents a diagnosis methodology that we developed and applied in the University of Thessaly, aiming to find cases of unnecessary high consumption. The methodology is based on the analysis of hourly electricity consumption data from seven university building complexes with separate medium voltage substations. The follow-up measures adopted are also presented, along with the overall effect on the evolution of electricity consumption.

ACS Style

Olympia Zogou; Tassos Stamatelos. Diagnosis and Reduction of Electricity Consumption Exceedance in Public University Buildings. The Open Fuels & Energy Science Journal 2014, 7, 34 -46.

AMA Style

Olympia Zogou, Tassos Stamatelos. Diagnosis and Reduction of Electricity Consumption Exceedance in Public University Buildings. The Open Fuels & Energy Science Journal. 2014; 7 (1):34-46.

Chicago/Turabian Style

Olympia Zogou; Tassos Stamatelos. 2014. "Diagnosis and Reduction of Electricity Consumption Exceedance in Public University Buildings." The Open Fuels & Energy Science Journal 7, no. 1: 34-46.

Research article
Published: 21 February 2014 in International Journal of Engine Research
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The results of full-scale regeneration tests with a unit silicon carbide diesel particulate filter installed on a single-cylinder diesel engine are presented. Two sets of transient regeneration experiments, one for each fuel used, with high level of exhaust gas flow rate (normalized per filter volume) and markedly different levels of soot loading were performed. The test fuels were conventional diesel (denoted as B0) and B20 biodiesel blend. The effect of the biodiesel on filter regeneration was further investigated by means of infrared thermography. The main objective was to investigate the catalytic soot ignition and regeneration propagation when the engine is fueled by biodiesel blends. Special focus was on the temperature distribution across the filter channels and the evolution of the regeneration at the central and peripheral part of the filter. The results indicated a faster evolution of the regeneration with lower overall filter wall temperatures with favorable effects on the filter durability, when the engine is fueled by B20.

ACS Style

Dimitrios Tziourtzioumis; Anastassios M Stamatelos. Investigation of the effect of biodiesel blends on the performance of a fuel additive-assisted diesel filter system. International Journal of Engine Research 2014, 15, 406 -420.

AMA Style

Dimitrios Tziourtzioumis, Anastassios M Stamatelos. Investigation of the effect of biodiesel blends on the performance of a fuel additive-assisted diesel filter system. International Journal of Engine Research. 2014; 15 (4):406-420.

Chicago/Turabian Style

Dimitrios Tziourtzioumis; Anastassios M Stamatelos. 2014. "Investigation of the effect of biodiesel blends on the performance of a fuel additive-assisted diesel filter system." International Journal of Engine Research 15, no. 4: 406-420.

Journal article
Published: 01 August 2012 in Energy Conversion and Management
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ACS Style

Dimitrios Tziourtzioumis; Anastassios Stamatelos. Effects of a 70% biodiesel blend on the fuel injection system operation during steady-state and transient performance of a common rail diesel engine. Energy Conversion and Management 2012, 60, 56 -67.

AMA Style

Dimitrios Tziourtzioumis, Anastassios Stamatelos. Effects of a 70% biodiesel blend on the fuel injection system operation during steady-state and transient performance of a common rail diesel engine. Energy Conversion and Management. 2012; 60 ():56-67.

Chicago/Turabian Style

Dimitrios Tziourtzioumis; Anastassios Stamatelos. 2012. "Effects of a 70% biodiesel blend on the fuel injection system operation during steady-state and transient performance of a common rail diesel engine." Energy Conversion and Management 60, no. : 56-67.

Journal article
Published: 09 July 2012 in American Journal of Environmental Engineering
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This paper presents the results of a monitoring campaign for ambient PM10 concentrations in Volos, Greece in the period 2005-2010. The aim is to give an overview of the evolution of particulate pollution, discuss effects of the micro-climate and demonstrate that PM10 monitoring may be carried out with low-cost measurement instruments at a community level. Statistical processing of the 2009-2010 measurement data indicates a negative correlation of PM10 with ambient air temperature and a positive correlation with relative humidity. Low PM10 concentrations are associated with E to SE winds and high concentrations with NW to N winds. Daily variation of particulate matter concentrations follows well established patterns with peaks at 09:00-10:00 and 23:00-24:00. The operation of an expanded PM10 monitoring network is under way.

ACS Style

Zogou O.; Anastassios Stamatelos. Analysis of Data From Ambient PM10 Concentration Monitoring in Volos in the Period 2005-2010. American Journal of Environmental Engineering 2012, 2, 97 -108.

AMA Style

Zogou O., Anastassios Stamatelos. Analysis of Data From Ambient PM10 Concentration Monitoring in Volos in the Period 2005-2010. American Journal of Environmental Engineering. 2012; 2 (4):97-108.

Chicago/Turabian Style

Zogou O.; Anastassios Stamatelos. 2012. "Analysis of Data From Ambient PM10 Concentration Monitoring in Volos in the Period 2005-2010." American Journal of Environmental Engineering 2, no. 4: 97-108.

Original articles
Published: 06 May 2010 in European Journal of Engineering Education
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During the last decade, significant funding has become available to Greek public universities to support the convergence to the common European space of higher education. In a number of departments, this funding was wisely invested in the development of a quality culture, covering not only the educational process, but also the services offered by the department's administration and technical support staff. This paper presents the design and implementation of a quality-oriented studies’ reform plan in the Mechanical Engineering Department, University of Thessaly in the period 2002–2008. Based on the successful experience from its application, a significant part of the personnel and students have become acquainted with basic quality assurance procedures and performance evaluation. Experience and lessons learnt from this effort are reported and discussed in this paper.

ACS Style

A. M. Stamatelos. Experience gained from the application of basic quality assurance procedures in a Greek university engineering department. European Journal of Engineering Education 2010, 35, 259 -270.

AMA Style

A. M. Stamatelos. Experience gained from the application of basic quality assurance procedures in a Greek university engineering department. European Journal of Engineering Education. 2010; 35 (3):259-270.

Chicago/Turabian Style

A. M. Stamatelos. 2010. "Experience gained from the application of basic quality assurance procedures in a Greek university engineering department." European Journal of Engineering Education 35, no. 3: 259-270.

Research article
Published: 01 May 2009 in Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering
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The results of engine bench tests of a 2.0l common-rail high-pressure injection passenger car diesel engine fuelled by B70 biodiesel blend are compared with the corresponding results of baseline tests with standard EN 590 diesel fuel. Engine performance and carbon monoxide (CO), total hydrocarbon (THC), and nitrogen oxide (NO x) emissions were measured. Also, indicative particulate sampling was made with a simplified undiluted exhaust sampler. The aim of this study was to understand better how the engine's electronic control unit (ECU) responds to the different fuel qualities. A series of characteristic operation points for engine testing is selected to serve this purpose better. Data acquisition of the engine ECU variables was made through INCA software. Also, additional data acquisition based on external sensors was carried out by means of Labview software. The results enhance understanding of the engine ECU behaviour with the B70 biodiesel blend. Also, they are compared with what is known from the related literature for the behaviour of common-rail diesel engines with biodiesel blends.

ACS Style

Dimitrios Tziourtzioumis; L Demetriades; O Zogou; Anastassios Stamatelos. Experimental investigation of the effect of a B70 biodiesel blend on a common-rail passenger car diesel engine. Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 2009, 223, 685 -701.

AMA Style

Dimitrios Tziourtzioumis, L Demetriades, O Zogou, Anastassios Stamatelos. Experimental investigation of the effect of a B70 biodiesel blend on a common-rail passenger car diesel engine. Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering. 2009; 223 (5):685-701.

Chicago/Turabian Style

Dimitrios Tziourtzioumis; L Demetriades; O Zogou; Anastassios Stamatelos. 2009. "Experimental investigation of the effect of a B70 biodiesel blend on a common-rail passenger car diesel engine." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 223, no. 5: 685-701.

Original articles
Published: 24 March 2009 in European Journal of Engineering Education
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An academic legislative reform of the public university sector was recently initiated in Greece (since 2005). It was designed to respond to the requirements of convergence to a common frame of the European Space of Higher Education. This reform found significant resistance from university personnel and students, resulting in a very slow degree of implementation. A careful examination of possible causes for the slow pace of reform usually points to the reluctance of a significant part of the academic and administrative personnel (tenured public service employees), to follow quality assurance procedures and undergo performance evaluation. Engineering schools, on the other hand, are more apt to adopt such principles, since they are taught in engineering curricula and widely applied in industry and services sectors. In this paper, the authors comparatively describe their experience in applying basic quality principles and practices to the university laboratory environment, motivated by cooperation with industry. The comparative discussion adds insight to the reasons for the resistance of the public higher education sector to quality assurance procedures and indicates specific directions to enhance the dissemination of quality culture in engineering faculties. After two decades of experience with the application and introduction of quality structures in the university and industry, the authors believe that engineering laboratories are a valuable tool in initiating and establishing a quality culture in the Greek higher education system.

ACS Style

G. M. Stamatelos; A. M. Stamatelos. The role of engineering laboratories in the establishment of a quality culture in higher education in Greece. European Journal of Engineering Education 2009, 34, 1 -13.

AMA Style

G. M. Stamatelos, A. M. Stamatelos. The role of engineering laboratories in the establishment of a quality culture in higher education in Greece. European Journal of Engineering Education. 2009; 34 (1):1-13.

Chicago/Turabian Style

G. M. Stamatelos; A. M. Stamatelos. 2009. "The role of engineering laboratories in the establishment of a quality culture in higher education in Greece." European Journal of Engineering Education 34, no. 1: 1-13.