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Selected Papers from the 9th European Conference on Renewable Energy Systems (ECRES2021)

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A special issue of Sustainability (ISSN 2071-1050). This special issue belongs to the section "Energy Sustainability".

Deadline for manuscript submissions: closed (31 October 2021) | Viewed by 8094

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Special Issue Editors

Prof. Dr. Erol Kurt

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Guest Editor

Department of Electrical and Electronic Engineering, Gazi University, Ankara, Turkey
Interests: theoretical and experimental cutting-edge studies; energy systems including wind, solar, geothermal, and hydrogen
Special Issues, Collections and Topics in MDPI journals

Dr. Jose Manuel Lopez-Guede

E-Mail Website
Guest Editor

Department of Automation Control, University of the Basque Country, Vitoria, Biscay, Spain
Interests: LiDAR data processing; image processing; control for autonomous vehicles; computational intelligence
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

We cordially invite you to participate in the 9th European Conference on Renewable Energy Systems (ECRES2021). The event will be held in Istanbul, Turkey, on 21–23 April 2021, with several universities and research centers from all over the world collaboring to provide technical support for this event.

The purpose of the ECRES is to bring together researchers, engineers, and natural scientists from all over the world interested in the advances of all branches of renewable energy systems. Presentations on wind, solar, hydrogen, hydro, and geothermal energy, solar concentrating, fuel cells, energy harvesting, and other energy-related topics are welcome.

The following are specific examples of topics of interest.

Energy materials production and characterization
Power electronic systems for renewable energy
Conventional energy systems and recovery
Engines and their combustion features
Offshore and tidal energy systems
Energy statistics and efficiency
Energy transmission systems
Heating/cooling systems
Energy/exergy analysis
Energy efficiency
Wind energy
Solar concentrating systems
Photovoltaic and their installation
Energy harvesters
Smart grid
Electrical machines
Hydroenergy plants
Biomass systems
Biodiesel systems
Combustion
Nuclear fusion systems
Hydrogen energy systems
Fuel cell systems
Efficiency in nuclear plants
Energy education
Energy informatics

Prof. Dr. Erol Kurt
Dr. Jose Manuel Lopez-Guede
Guest Editors

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Sustainability is an international peer-reviewed open access semimonthly journal published by MDPI.

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Keywords

renewable energy
wind energy
solar energy
photovoltaic energy
energy materials
electromobility
energy education
conventional energy systems

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Published Papers (3 papers)

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Research

17 pages, 1791 KiB

Open AccessArticle

Effect of Woody Biomass Gasification Process Conditions on the Composition of the Producer Gas

by Alejandro Lyons Cerón, Alar Konist, Heidi Lees and Oliver Järvik

Sustainability 2021, 13(21), 11763; https://doi.org/10.3390/su132111763 - 25 Oct 2021

Cited by 8 | Viewed by 2432

Abstract

Using woody biomass in thermochemical gasification can be a viable alternative for producing renewable energy. The type of biomass and the process parameters influence the producer gas composition and quality. This paper presents research on the composition of the producer gas from the gasification of three woody biomass species: spruce, alder, and pine. The experiments were conducted in a drop-tube reactor at temperatures of 750, 850, and 950 °C, using air as the gasifying agent, with equivalence ratios of 0.38 and 0.19. Gas chromatography with a thermal conductivity detector was used to determine the composition of the producer gas, while the production of total organic compounds was detected using Fourier-transform infrared spectroscopy. All three wood species exhibited very similar producer gas composition. The highest concentration of combustible gases was recorded at 950 °C, with an average of 4.1, 20.5, and 4.6 vol% for H₂, CO, and CH₄, respectively, and a LHV ranging from 4.3–5.1 MJ/m³. The results were in accordance with other gasification studies of woody species. Higher temperatures enhanced the composition of the producer gas by promoting endothermic and exothermic gasification reactions, increasing gas production while lowering solid and tar yields. The highest concentrations of combustible gases were observed with an equivalence ratio of 0.38. Continuous TOC measurement allowed understanding the evolution of the gasification process and the relation between a higher production of TOC and CO as the gasification temperature raised. Full article

(This article belongs to the Special Issue Selected Papers from the 9th European Conference on Renewable Energy Systems (ECRES2021))

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14 pages, 4379 KiB

Open AccessArticle

Rotating Microtab Implementation on a DU91W250 Airfoil Based on the Cell-Set Model

by Alejandro Ballesteros-Coll, Koldo Portal-Porras, Unai Fernandez-Gamiz, Ekaitz Zulueta and Jose Manuel Lopez-Guede

Sustainability 2021, 13(16), 9114; https://doi.org/10.3390/su13169114 - 14 Aug 2021

Cited by 4 | Viewed by 1974

Abstract

Flow control device modeling is an engaging research field for wind turbine optimization, since in recent years wind turbines have grown in proportions and weight. The purpose of the present work was to study the performance and effects generated by a rotating microtab (MT) implemented on the trailing edge of a DU91W250 airfoil through the novel cell-set (CS) model for the first time via CFD techniques. The CS method is based on the reutilization of an already calculated mesh for the addition of new geometries on it. To accomplish that objective, the required region is split from the main domain, and new boundaries are assigned to the mentioned construction. Three different MT lengths were considered: h = 1%, 1.5% and 2% of the airfoil chord length, as well as seven MT orientations (β): from 0° to −90° regarding the horizontal axis, for five angles of attack: 0°, 2°, 4°, 6° and 9°. The numerical results showed that the increases of the β rotating angle and the MT length (h) led to higher aerodynamic performance of the airfoil, C_L/C_D = 164.10 being the maximum ratio obtained. All the performance curves showed an asymptotic trend as the β angle reduced. Qualitatively, the model behaved as expected, proving the relationship between velocity and pressure. Taking into consideration resulting data, the cell-set method is appropriate for computational testing of trailing edge rotating microtab geometry. Full article

(This article belongs to the Special Issue Selected Papers from the 9th European Conference on Renewable Energy Systems (ECRES2021))

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20 pages, 7871 KiB

Open AccessArticle

Design and Implementation of a Maximum Power Point Tracking System for a Piezoelectric Wind Energy Harvester Generating High Harmonicity

by Erol Kurt, Davut Özhan, Nicu Bizon and Jose Manuel Lopez-Guede

Sustainability 2021, 13(14), 7709; https://doi.org/10.3390/su13147709 - 9 Jul 2021

Cited by 4 | Viewed by 2712

Abstract

In this work, a maximum power point tracking (MPPT) system for its application to a new piezoelectric wind energy harvester (PWEH) has been designed and implemented. The motivation for such MPPT unit comes from the power scales of the piezoelectric layers being in the order of μW. In addition, the output generates highly disturbed voltage waveforms with high total harmonic distortion (THD), thereby high THD values cause a certain power loss at the output of the PWEH system and an intense motivation is given to design and implement the system. The proposed MPPT system is widely used for many different harvesting studies, however, in this paper it has been used at the first time for such a distorted waveform to our best knowledge. The MPPT consists of a rectifier unit storing the rectified energy into a capacitor with a certain voltage called V_OC (i.e., the open circuit voltage of the harvester), then a dc-dc converter is used with the help of the MPPT unit using the half of V_OC as the critical value for the performance of the control. It has been demonstrated that the power loss is nearly half of the power for the MPPT-free system, the efficiency has been increased with a rate of 98% and power consumption is measured as low as 5.29 μW. Full article

(This article belongs to the Special Issue Selected Papers from the 9th European Conference on Renewable Energy Systems (ECRES2021))

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