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Green Energy
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Green Energy

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "B: Energy and Environment".

Deadline for manuscript submissions: closed (25 November 2021) | Viewed by 11191

Special Issue Editors

Prof. Dr. Antonino Oscar Di Tommaso

E-Mail Website
Guest Editor
Department of Engineering, University of Palermo, Palermo, Italy
Interests: electric machines; electric drives; power electronics; programming, design and fabrication of electronic control boards; theoretical physics
Special Issues, Collections and Topics in MDPI journals
Dr. Massimo Caruso

E-Mail Website
Guest Editor
Department of Engineering, University of Palermo, viale delle Scienze, Building nr. 9, 90128 Palermo, Italy
Interests: design, simulation, and experimental development of electrical machines and drives for industrial and sustainable energy applications
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The concept of Green Energy refers to the adoption of non-polluting natural energy resources capable of generating an inexhaustible and clean energy supply, aiming towards the sustainable development of our planet. In this perspective, the most widespread renewable energy systems (RES), namely wind, solar, hydrogen, biomass and geothermal energy technologies, play a crucial role in covering the global energy demand of the growing population. The need for new, high-performance green energy technologies and methods is constantly increasing, as such technologies will enable the reduction of greenhouse gas emissions and the control of issues related to climate change, global warming and pollution. In this context, many challenges must be faced for an optimal development and exploitation of green energy technologies, from the viewpoints of production to application, in order to promote emerging ideas and research. Therefore, this Special Issue, entitled “Green Energy”, aims to present and disseminate the most recent advances and future perspectives related to the theory, design, modelling, solutions and applications in the field of renewable energy systems. This Special Issue welcomes both theoretical and experimental research works, as well as review articles, devoted to the development of innovative low- or zero-carbon technologies.

Topics of interest include, but are not limited to:

  • Simulation tools, modeling and analysis of wind turbines;
  • Novel materials, methods, solutions and characterization of PV systems;
  • Development of hybrid solar–thermal systems;
  • Energy savings in RES;
  • Development of sea wave generators;
  • Advances in fuel-cell technologies;
  • Design, development and control of innovative power converters for renewable generation systems;
  • Novel measurement techniques in green energy systems;
  • Innovative concepts and solutions for biomass energy generation;
  • New concepts and applications in geothermal technologies;
  • Rain energy harvesters.

Prof. Dr. Antonino Oscar Di Tommaso
Dr. Massimo Caruso
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

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. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Photovoltaic systems
  • Wind farms
  • Electrical machines
  • Electrical generators
  • Hydrogen energy
  • Fuel cell technology
  • Biomass
  • Geothermal energy
  • Sea wave energy
  • Energy harvesting
  • Multiphase generators
  • Power converters
  • Finite element analysis

Published Papers (3 papers)

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Research

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16 pages, 5263 KiB  
Article
Energy from the Waves: Integration of a HESS to a Wave Energy Converter in a DC Bus Electrical Architecture to Enhance Grid Power Quality
by Linda Barelli, Ermanno Cardelli, Dario Pelosi, Dana Alexandra Ciupageanu, Panfilo Andrea Ottaviano, Michela Longo and Dario Zaninelli
Energies 2022, 15(1), 10; https://doi.org/10.3390/en15010010 - 21 Dec 2021
Cited by 4 | Viewed by 2562
Abstract
The need for environmental protection is pushing to a massive introduction of energy production from renewables. Although wind and solar energy present the most mature technologies for energy generation, wave energy has a huge annual energy potential not exploited yet. Indeed, no leading [...] Read more.
The need for environmental protection is pushing to a massive introduction of energy production from renewables. Although wind and solar energy present the most mature technologies for energy generation, wave energy has a huge annual energy potential not exploited yet. Indeed, no leading device for wave energy conversion has already been developed. Hence, the future exploitation of wave energy will be strictly related to a specific infrastructure for power distribution and transmission that has to satisfy high requirements to guarantee grid safety and stability, because of the stochastic nature of this source. To this end, an electrical architecture model, based on a common DC bus topology and including a Hybrid Energy Storage System (HESS) composed by Li-ion battery and flywheel coupled to a wave energy converter, is here presented. In detail, this research work wants to investigate the beneficial effects in terms of voltage and current waveforms frequency and transient behavior at the Point of Common Coupling (PCC) introduced by HESS under specific stressful production conditions. Specifically, in the defined simulation scenarios it is demonstrated that the peak value of the voltage wave frequency at the PCC is reduced by 64% to 80% with a faster stabilization in the case of HESS with respect to storage absence, reaching the set value (50 Hz) in a shorter time (by −10% to −42%). Therefore, HESS integration in wave energy converters can strongly reduce safety and stability issues of the main grid relating to intermittent and fluctuating wave production, significantly increasing the tolerance to the expected increasing share of electricity from renewable energy sources. Full article
(This article belongs to the Special Issue Green Energy)
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Review

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17 pages, 4336 KiB  
Review
A Systematic Review of the Design and Heat Transfer Performance of Enhanced Closed-Loop Geothermal Systems
by Andres Budiono, Suyitno Suyitno, Imron Rosyadi, Afif Faishal and Albert Xaverio Ilyas
Energies 2022, 15(3), 742; https://doi.org/10.3390/en15030742 - 20 Jan 2022
Cited by 18 | Viewed by 3069
Abstract
Geothermal energy is one of the primary sources of clean electricity generation as the world transitions away from fossil fuels. In comparison to enhanced geothermal methods based on artificial fracturing, closed-loop geothermal systems (CLGSs) avoid seismicity-induced risk, are independent of reservoir permeability, and [...] Read more.
Geothermal energy is one of the primary sources of clean electricity generation as the world transitions away from fossil fuels. In comparison to enhanced geothermal methods based on artificial fracturing, closed-loop geothermal systems (CLGSs) avoid seismicity-induced risk, are independent of reservoir permeability, and do not require the direct interaction between the fluid and the geothermal reservoir. In recent years, the development of CLGS technologies that offer high energy efficiencies has been explored. Research on coaxial closed-loop geothermal systems (CCLGS) and U-shaped closed-loop geothermal system (UCLGS) systems were reviewed in this paper. These studies were categorized based on their design, modeling methods, and heat transfer performance. It was found that UCLGSs had superior heat transfer performances compared to CCLGS. In addition, UCLGSs that utilized CO2 as a working fluid were found to be promising technologies that could help in addressing the future challenges associated with zero-emission compliance and green energy demand. Further research to improve the heat transfer performance of CLGS, especially with regards to improvements in wellbore layout, equipment sizing, and its integration with CO2 capture technologies is critical to ensuring the feasibility of this technology in the future. Full article
(This article belongs to the Special Issue Green Energy)
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25 pages, 997 KiB  
Review
The Deactivation of Industrial SCR Catalysts—A Short Review
by Agnieszka Szymaszek, Bogdan Samojeden and Monika Motak
Energies 2020, 13(15), 3870; https://doi.org/10.3390/en13153870 - 29 Jul 2020
Cited by 51 | Viewed by 4818
Abstract
One of the most harmful compounds are nitrogen oxides. Currently, the common industrial method of nitrogen oxides emission control is selective catalytic reduction with ammonia (NH3-SCR). Among all of the recognized measures, NH3-SCR is the most effective and reaches [...] Read more.
One of the most harmful compounds are nitrogen oxides. Currently, the common industrial method of nitrogen oxides emission control is selective catalytic reduction with ammonia (NH3-SCR). Among all of the recognized measures, NH3-SCR is the most effective and reaches even up to 90% of NOx conversion. The presence of the catalyst provides the surface for the reaction to proceed and lowers the activation energy. The optimum temperature of the process is in the range of 150–450 °C and the majority of the commercial installations utilize vanadium oxide (V2O5) supported on titanium oxide (TiO2) in a form of anatase, wash coated on a honeycomb monolith or deposited on a plate-like structures. In order to improve the mechanical stability and chemical resistance, the system is usually promoted with tungsten oxide (WO3) or molybdenum oxide (MoO3). The efficiency of the commercial V2O5-WO3-TiO2 catalyst of NH3-SCR, can be gradually decreased with time of its utilization. Apart from the physical deactivation, such as high temperature sintering, attrition and loss of the active elements by volatilization, the system can suffer from chemical poisoning. All of the presented deactivating agents pass for the most severe poisons of V2O5-WO3-TiO2. In order to minimize the harmful influence of H2O, SO2, alkali metals, heavy metals and halogens, a number of methods has been developed. Some of them improve the resistance to poisons and some are focused on recovery of the catalytic system. Nevertheless, since the amount of highly contaminated fuels combusted in power plants and industry gradually increases, more effective poisoning-preventing and regeneration measures are still in high demand. Full article
(This article belongs to the Special Issue Green Energy)
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