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Fuel cells are promising energy conversion devices exhibiting high electrical efficiencies and zero emissions when green hydrogen is employed as a fuel feedstock, with applications in both the mobility and stationary sectors. This paper presents a comprehensive review on anode and cathode layer macroscopic modelling studies for proton exchange membrane fuel cells (PEMFCs) that incorporate in a coupled manner both the electrochemical and transport (mass, heat and momentum) phenomena taking place at each compartment. The reviewed models have been classified according to their spatial dimensions into one-dimensional, two-dimensional and three-dimensional, giving particular emphasis on the examination of both catalyst layers. For each examined case, valuable information is provided regarding the modelling technique applied, the assumptions that have been made, and the validation procedure followed. This review includes essential information regarding the suitability of each simulation method to understand the impact of electro-catalysts’ physicochemical properties on the overall PEMFC electrochemical performance. In this sense, the requirement to simulate PEMFCs operation by investigating several alternative electrode material composites is underlined to provide a credible pathway to improve cell performance and minimize or even eliminate the incorporation of costly materials such as platinum or platinum group metals (PGM) in the anode and cathode electrodes.
Stefanos Tzelepis; Kosmas A. Kavadias; George E. Marnellos; George Xydis. A review study on proton exchange membrane fuel cell electrochemical performance focusing on anode and cathode catalyst layer modelling at macroscopic level. Renewable and Sustainable Energy Reviews 2021, 151, 111543 .
AMA StyleStefanos Tzelepis, Kosmas A. Kavadias, George E. Marnellos, George Xydis. A review study on proton exchange membrane fuel cell electrochemical performance focusing on anode and cathode catalyst layer modelling at macroscopic level. Renewable and Sustainable Energy Reviews. 2021; 151 ():111543.
Chicago/Turabian StyleStefanos Tzelepis; Kosmas A. Kavadias; George E. Marnellos; George Xydis. 2021. "A review study on proton exchange membrane fuel cell electrochemical performance focusing on anode and cathode catalyst layer modelling at macroscopic level." Renewable and Sustainable Energy Reviews 151, no. : 111543.
Ligusticum chuanxiong (known as Chuanxiong in China) is a traditional edible-medicinal herb, which has been playing important roles in fighting against COVID-19 (Ma et al. 2020). In March 2021, we investigated stem rot of Chuanxiong in six adjacent fields (~100 ha) in Chengdu, Sichuan Province, China. The disease incidence was above 5% in each field. Symptomatic plants showed stem rot, watersoaked lesions, and blackening with white hyphae present on the stems. Twelve symptomatic Chuanxiong plants (2 plants/field) were sampled. Diseased tissues from the margins of necrotic lesions were surface sterilized in 75% ethanol for 45 s, and 2% NaClO for 5 min. Samples were then rinsed three times in sterile distilled water and cultured on potato dextrose agar (PDA) at 25ºC for 72 h. Fourteen fungal cultures were isolated from 18 diseased tissues, of which eight monosporic isolates showed uniform characteristics. The eight fungal isolates showed fluffy white aerial mycelia and produced yellow pigments with age. Mung bean broth was used to induce sporulation. Macroconidia were sickle-shaped, slender, 3- to 5-septate, and averaged 50 to 70 μm in length. Based on morphological features of colonies and conidia, the isolates were tentatively identified as Fusarium spp. (Leslie and Summerell 2006). To identify the species, the partial translation elongation factor 1 alpha (TEF1-α) gene was amplified and sequenced (O’Donnell et al. 1998). TEF1-α sequences of LCSR01, LCSR02 and LCSR05 isolates (GenBank nos. MZ169386, MZ169388 and MZ169387) were 100%, 99.72% and 99.86% identical to that of F. asiaticum strain NRRL 26156, respectively. The phylogenetic tree based on TEF1-α sequences showed these isolates clustered with F. asiaticum using Neighbor-Joining algorithm. Furthermore, these isolates were identified using the specific primer pair Fg16 F/R (Nicholson et al. 1998). The results showed these isolates (GenBank nos. MZ164938, MZ164939 and MZ164940) were 100% identical to F. asiaticum NRRL 26156. Pathogenicity test of the isolate LCSR01 was conducted on Chuanxiong. After wounding Chuanxiong stalks and rhizomes with a sterile needle, the wounds were inoculated with mycelia PDA plugs. A total of 30 Chuanxiong rhizomes and stalks were inoculated with mycelia PDA plugs, and five mock-inoculated Chuanxiong rhizomes and stalks served as controls. After inoculation, the stalks and rhizomes were kept in a moist chamber at 25°C in the dark. At 8 days post inoculation (dpi), all inoculated stalks and rhizomes exhibited water-soaked and blackened lesions. At 10 dpi, the stalks turned soft and decayed, and abundant hyphae grew on the exterior of infected plants, similar to those observed in the field. No disease symptoms were observed on the control plants. The pathogen was re-isolated from the inoculated tissues and the identity was confirmed as described above. Ten fungal cultures were re-isolated from the 10 inoculated tissues, of which nine fungal cultures were F. asiaticum, fulfilling Koch’s postulates. To our knowledge, this is the first report of F. asiaticum causing stem rot of Chuanxiong in China. Chuanxiong has been cultivated in rotation with rice over multiple years. This rotation may have played a role in the increase in inoculum density in soil and stem rot epidemics in Chuanxiong. Diseased Chuanxiong may be contaminated with the mycotoxins produced by F. asciaticum, 3-acetyldeoxynivalenol or nivalenol, which may deleteriously affect human health. Therefore, crop rotations should be considered carefully to reduce disease impacts.
Tingting Zhu; Linxuan Li; Antonios Petridis; George Xydis; Maozhi Ren. First Report of Fusarium asiaticum Causing Stem Rot of Ligusticum chuanxiong in China. Plant Disease 2021, 1 .
AMA StyleTingting Zhu, Linxuan Li, Antonios Petridis, George Xydis, Maozhi Ren. First Report of Fusarium asiaticum Causing Stem Rot of Ligusticum chuanxiong in China. Plant Disease. 2021; ():1.
Chicago/Turabian StyleTingting Zhu; Linxuan Li; Antonios Petridis; George Xydis; Maozhi Ren. 2021. "First Report of Fusarium asiaticum Causing Stem Rot of Ligusticum chuanxiong in China." Plant Disease , no. : 1.
There is no clear solution for dealing with the severe consequences of rapid urbanization. Since it cannot be reverted as a phenomenon, the scientific community has decided to look for sustainable solutions within the urban environment. An Energy-Food Nexus could optimize the way cities interact with meeting energy and food demands in intense urban environments. This work proposed a decisive solution by introducing plant factories as a support to the grid and to the local leafy greens industry. The work studied how plant factories can act as a source of load flexibility via a wind energy project. Under various scenarios analysed for a specific case in Central Greece, it was revealed that possible investors in both wind energy and plant factories, in most of the cases, they will have a full repayment period of their investment in less than 8 years, while in some cases even as low as 4 years.
George Xydis; David Strasszer; Dafni Despoina Avgoustaki; Evanthia Nanaki. Mass deployment of plant factories as a source of load flexibility in the grid under an energy-food nexus. A technoeconomics-based comparison. Sustainable Energy Technologies and Assessments 2021, 47, 101431 .
AMA StyleGeorge Xydis, David Strasszer, Dafni Despoina Avgoustaki, Evanthia Nanaki. Mass deployment of plant factories as a source of load flexibility in the grid under an energy-food nexus. A technoeconomics-based comparison. Sustainable Energy Technologies and Assessments. 2021; 47 ():101431.
Chicago/Turabian StyleGeorge Xydis; David Strasszer; Dafni Despoina Avgoustaki; Evanthia Nanaki. 2021. "Mass deployment of plant factories as a source of load flexibility in the grid under an energy-food nexus. A technoeconomics-based comparison." Sustainable Energy Technologies and Assessments 47, no. : 101431.
Purpose Until recently, the Gulf Cooperation Council (GCC) region, whose members consist of Saudi Arabia, the United Arab Emirates, Kuwait, Qatar, Oman and Bahrain, has not significantly focused on the green transition. Specifically, wind energy development has made minimal progress relative to that of other regions. Design/methodology/approach The abundance of cheap fossil fuels in the region has not incentivized renewable energy development, and where this has taken place solar technologies are often preferred. Findings However, lower technology costs together with lost investment opportunities – also common elsewhere in the world, has increased the pressure on the GCC region from developers. This work qualitatively addresses the challenges and the strategies for the wind development in the area. It focuses on the analysis of different proposed type of investments – driven by a state-supported proposed fund – such as utility-scale investments, industry-specific investments, manufacturing investments and regional accelerators. Originality/value The work also suggests that Gulf sovereign wealth funds should act as the lead investors under new schemes, such as joint ventures, for wind development in the GCC, using their wealth to offering their populations with new sources of employment as well as energy that is sustainable.
Colby Connelly; George Xydis. Wind energy in the Gulf Cooperation Council region: progress, challenges and strategies for development. Review of Economics and Political Science 2021, ahead-of-p, 1 .
AMA StyleColby Connelly, George Xydis. Wind energy in the Gulf Cooperation Council region: progress, challenges and strategies for development. Review of Economics and Political Science. 2021; ahead-of-p (ahead-of-p):1.
Chicago/Turabian StyleColby Connelly; George Xydis. 2021. "Wind energy in the Gulf Cooperation Council region: progress, challenges and strategies for development." Review of Economics and Political Science ahead-of-p, no. ahead-of-p: 1.
The wind energy industry showed rapid growth in the past decade, pushing designs to the physical limits. In the last few years, the exponential growth of the wind turbine sizes capped, and the performance upgrades are reached with optimization processes. The first wave was on major parts, but with time advancing the “cost out” strategies are pushed to minor components. A major problem is service costs and the continuous search for missing spare parts in the market. The main aim of this study is to identify when is the best entry point for the additive manufacturing (AM) technology by the hydraulic manufacturer wind turbine companies. From the commercial application for expensive prototypes, it has evolved to economical home use applications. The newly available machines allow printing parts with competing precision to machining equivalents. The material selections range from plastics to metals with mechanical properties equally good or better. This project aims to provide a comprehensive review of the implementation of AM for hydraulic systems in wind turbines. Application screening was done by desk research and on AM technologies. Scientific research has been found on the topic for benchmarking, viability, and cost models. It has been found that there are still missing data for the mechanical properties of the available materials. The result of the decision-weighted matrix shows that the business could gain a competitive advantage by the AM implementation in terms of resources savings and productivity. Although from the technological and market perspective it is justified to initiate before further action the business should review its organization viability.
Gergely Kocsis; George Xydis. An Evaluation Framework on Additive Manufacturing for Hydraulic Systems in Wind Turbines Focused on System Simplification. Modelling 2021, 2, 327 -343.
AMA StyleGergely Kocsis, George Xydis. An Evaluation Framework on Additive Manufacturing for Hydraulic Systems in Wind Turbines Focused on System Simplification. Modelling. 2021; 2 (2):327-343.
Chicago/Turabian StyleGergely Kocsis; George Xydis. 2021. "An Evaluation Framework on Additive Manufacturing for Hydraulic Systems in Wind Turbines Focused on System Simplification." Modelling 2, no. 2: 327-343.
The present study discusses alternative ways of achieving optimum energy efficiency for historic buildings in areas where sustainable energy projects are planned. About 25% of Europe’s building stock was constructed before the mid-20th century and despite EU’s strenuous efforts for the protection and conservation of historic buildings and complexes, achieving energy efficiency with the minimum or preferably no intervention remains as a requirement. The settlement of Monemvasia, has been selected as our case study. A model building was chosen, its special characteristics are presented, and four solutions to the energy efficiency upgrade of the building were tested: (a) the application of internal insulation, (b) a heat pump installation, (c) the application of roof insulation, and (d) the replacement of the internal doorframes. The four scenarios were simulated via the TEE-KENAK software and the percentage of the annual energy saved through the application of each one of the mentioned measures was estimated. The results proved that installing a heat pump and internal insulation would maximise energy savings. Coupling the energy demand of the settlement in correlation with a wind energy project in the wider area, and the available curtailment was explored. The results showed that if 300 houses decide on acquiring their electricity consumption from the local wind independent power producer, at a price of EUR 35/MWh, the possible profit from the market could reach EUR100,000 per year. Such a business-driven concept could be extrapolated and evolve into a holistic wind energy and historic environment symbiosis setting.
George A Xydis; Katerina Kremastioti; Maria Panagiotidou. Wind energy and the historic environment: A business-driven symbiosis approach. Energy & Environment 2021, 1 .
AMA StyleGeorge A Xydis, Katerina Kremastioti, Maria Panagiotidou. Wind energy and the historic environment: A business-driven symbiosis approach. Energy & Environment. 2021; ():1.
Chicago/Turabian StyleGeorge A Xydis; Katerina Kremastioti; Maria Panagiotidou. 2021. "Wind energy and the historic environment: A business-driven symbiosis approach." Energy & Environment , no. : 1.
The majority of the cultivated species in indoor vertical farms require many hours of light each day to reach their full potential in terms of biomass, leaf size, nutritional value, taste, and colour. At the same time, the cost of electricity can be very high due to the many hours of operation, which can be an inhibiting factor for the advancement of technology and the profitability of the farm. In this study, we tested the growth of basil plants (Ocimum basilicum) under continuous and intermittent photoperiods. The leaf physiological traits of three different photoperiod treatments were assessed and used to estimate the toleration rate of the plants under different light schedules. In the first indoor growth chamber, the plants were grown under 16 h of continuous light, in the second chamber under a normal photoperiod of 14 h with intermittent light, and in the third chamber under a load-shifting demand response with 14 h of intermittent light. The purpose was to evaluate and design flexible intermittent light exposure to reduce the electricity consumption for crops grown in indoor environments while maintaining a high growth rate and biomass production of the plants. The presented results of this experimental research show a positive correlation of the plants’ responses to abiotic stress when exposed to short 10-min periods of intermittent light, without having significant effects on the physiological responses of the cultivation. The physiological, biochemical, and morphological status of the plants were assessed in terms of photosynthetic rate, chlorophyll pigments, stomatal conductance, and transpiration rate of the plants. The protocol with intermittent light exposure induced a significantly 47% increase in biomass production compared to the continuous photoperiod, resulting in a more economical, sustainable, business, and ecological impact on the energy footprint of indoor food production.
Dafni Despoina Avgoustaki; Thomas Bartzanas; George Xydis. Minimising the energy footprint of indoor food production while maintaining a high growth rate: Introducing disruptive cultivation protocols. Food Control 2021, 130, 108290 .
AMA StyleDafni Despoina Avgoustaki, Thomas Bartzanas, George Xydis. Minimising the energy footprint of indoor food production while maintaining a high growth rate: Introducing disruptive cultivation protocols. Food Control. 2021; 130 ():108290.
Chicago/Turabian StyleDafni Despoina Avgoustaki; Thomas Bartzanas; George Xydis. 2021. "Minimising the energy footprint of indoor food production while maintaining a high growth rate: Introducing disruptive cultivation protocols." Food Control 130, no. : 108290.
In an aim to contribute to already existing knowledge upon the subject of smart cities and the public sector’s wider knowledge in Europe, this study investigates the perception by the municipalities and the wider public sector, responsible for implementing smart solutions in the environment. The understanding of the concept of smart cities/villages by municipalities is on a low level due to the fact that the problem is too wide, not well described, solutions even wider, accompanied by the lack of experts able to offer comprehensive solutions to municipalities. The study presents factors according to the current municipalities’ knowledge (environmental awareness, knowledge and prior experience) and the existing market, of whether these factors can be said that affect the acceptance of smart cities. The public is already aware of the smart cities as a general concept, however, the study sheds light upon the established knowledge that the decision makers have in five countries, Hungary, Slovakia, Italy, Lithuania, and Denmark.
George Xydis; Luca Pagliaricci; Živilė Paužaitė; Vygintas Grinis; Gyula Sallai; Peter Bakonyi; Radoslav Vician. SMARTIES Project: The Survey of Needs for Municipalities and Trainers for Smart Cities. Challenges 2021, 12, 13 .
AMA StyleGeorge Xydis, Luca Pagliaricci, Živilė Paužaitė, Vygintas Grinis, Gyula Sallai, Peter Bakonyi, Radoslav Vician. SMARTIES Project: The Survey of Needs for Municipalities and Trainers for Smart Cities. Challenges. 2021; 12 (1):13.
Chicago/Turabian StyleGeorge Xydis; Luca Pagliaricci; Živilė Paužaitė; Vygintas Grinis; Gyula Sallai; Peter Bakonyi; Radoslav Vician. 2021. "SMARTIES Project: The Survey of Needs for Municipalities and Trainers for Smart Cities." Challenges 12, no. 1: 13.
Small-scale wind turbines simulations are not as accurate when it comes to costs as compared to the large-scale wind turbines, where costs are more or less standard. In this paper, an analysis was done on a decision for a wind turbine investment in Bellingham, Whatcom County, Washington. It was revealed that a decision taken based only on a software tool could be destructive for the sustainability of a project, since not taking into account specific taxation, net metering, installation, maintenance costs, etc., beyond the optimization that the tool offers, can hide the truth.
Sheridan Ribbing; George Xydis. Renewable Energy at Home: A Look into Purchasing a Wind Turbine for Home Use—The Cost of Blindly Relying on One Tool in Decision Making. Clean Technologies 2021, 3, 299 -310.
AMA StyleSheridan Ribbing, George Xydis. Renewable Energy at Home: A Look into Purchasing a Wind Turbine for Home Use—The Cost of Blindly Relying on One Tool in Decision Making. Clean Technologies. 2021; 3 (2):299-310.
Chicago/Turabian StyleSheridan Ribbing; George Xydis. 2021. "Renewable Energy at Home: A Look into Purchasing a Wind Turbine for Home Use—The Cost of Blindly Relying on One Tool in Decision Making." Clean Technologies 3, no. 2: 299-310.
The limited literature on the cost of various recycling methodologies for thermoset composites sets the background of this work, focusing mainly on the identification of an upper and lower economic value of glass fibre recovered from wind turbine blades recycling. The study briefly reviews the materials used by various original equipment manufacturers (OEM) for wind turbine blades. Successively, it provides an overview of the various recycling methods with interest in recovered materials, mechanical and physical properties, which are used, for estimating a maximum expected value. All recycling processes show a negative effect on mechanical properties with strength loss between 30% and 60%. Process energy demands are reviewed, and considerations are set forward to estimate the minimum cost of operating mechanical, pyrolysis and fluidized bed plants in Germany. Ultimately, current applications of recovered material and related markets are explored. Through interviews and secondary data, it is highlighted that despite the lower mechanical properties, grinded material finds applications in traditional processes, cement kilns and new products. It is also found that pyrolysed fibres can be used as insulation material and oils can be easy to distil. Pyrolysis is a relatively expensive process, thereby, distillation of the oils and energy recovery are necessary enablers towards commercial viability. Mechanically grinded material presents the lowest process cost with ca. €90/tonne, thus, below landfilling and incineration and falling within the attention of private businesses. Numerous markets are available for recovered materials from wind turbine blades, primarily for grinded products and secondly for pyrolysed glass fibre.
Rosario Fonte; George Xydis. Wind turbine blade recycling: An evaluation of the European market potential for recycled composite materials. Journal of Environmental Management 2021, 287, 112269 .
AMA StyleRosario Fonte, George Xydis. Wind turbine blade recycling: An evaluation of the European market potential for recycled composite materials. Journal of Environmental Management. 2021; 287 ():112269.
Chicago/Turabian StyleRosario Fonte; George Xydis. 2021. "Wind turbine blade recycling: An evaluation of the European market potential for recycled composite materials." Journal of Environmental Management 287, no. : 112269.
This paper discusses and rebuts McKenna et al.‘s (2020, hereinafter M20) critique of the European wind power potential analysis of Enevoldsen et al. (2019, hereinafter E19). This paper rebuts M20's five claims regarding 1) potential definitions and conceptualizations of sociotechnical systems, 2) incomplete literature review, 3) opaque and incorrect use of input data, 4) oversimplified methods without validation, and 5) lack of consideration for some recent results. The five claims have been discussed using additional literature reviews, data from real operational European onshore wind turbines, elaborations of the research methodologies, as well as the justifications for the selected data and materials in E19, and finally thorough examinations of the proposed justifications for the five claims by M20 from where the majority was grounded in previous publications by the author group behind M20. We conclude that the relevant claims of M20 are incorrect or unproven, so the results of E19 stand.
Peter Enevoldsen; Finn-Hendrik Permien; Ines Bakhtaoui; Anna-Katharina von Krauland; Mark Z. Jacobson; George Xydis; Benjamin K. Sovacool; Scott V. Valentine; Daniel Luecht; Gregory Oxley. On the socio-technical potential for onshore wind in Europe: A response to critics. Energy Policy 2021, 151, 112147 .
AMA StylePeter Enevoldsen, Finn-Hendrik Permien, Ines Bakhtaoui, Anna-Katharina von Krauland, Mark Z. Jacobson, George Xydis, Benjamin K. Sovacool, Scott V. Valentine, Daniel Luecht, Gregory Oxley. On the socio-technical potential for onshore wind in Europe: A response to critics. Energy Policy. 2021; 151 ():112147.
Chicago/Turabian StylePeter Enevoldsen; Finn-Hendrik Permien; Ines Bakhtaoui; Anna-Katharina von Krauland; Mark Z. Jacobson; George Xydis; Benjamin K. Sovacool; Scott V. Valentine; Daniel Luecht; Gregory Oxley. 2021. "On the socio-technical potential for onshore wind in Europe: A response to critics." Energy Policy 151, no. : 112147.
The development in the field of wind turbines is continuously growing. However, most of the times, the energy of wind is exploited by using huge wind-power plants, while wind energy installations in urban and suburban areas, as space and available land, are a lot more limited, is something relatively new, with great potential though. The major challenge regarding small urban wind turbines can be summarized as a lack of understanding of the wind resource in the built environment, with a combination of missing measurements in this field that needed to be addressed. Aarhus University Campus Herning, located in the suburban area of Herning, is looking for a suitable place to install one small wind turbine (SWT). This study attempts to provide a comprehensive framework for SWTs and the characteristics of urban wind flow. The analysis helped in identifying the two most appropriate sites for SWTs installation sites in the AU Herning building.
David Strasszer; George Xydis. CFD-Based Wind Assessment for Suburban Buildings. The Case Study of Aarhus University, Herning Campus. Frontiers in Energy Research 2020, 8, 1 .
AMA StyleDavid Strasszer, George Xydis. CFD-Based Wind Assessment for Suburban Buildings. The Case Study of Aarhus University, Herning Campus. Frontiers in Energy Research. 2020; 8 ():1.
Chicago/Turabian StyleDavid Strasszer; George Xydis. 2020. "CFD-Based Wind Assessment for Suburban Buildings. The Case Study of Aarhus University, Herning Campus." Frontiers in Energy Research 8, no. : 1.
Food safety is an important scientific field, but at the same time a discussion topic of modern society that occupies more and more space of our every day time, dealing with the preparation of food, with its nutritious value, and various transportation and storage ways aiming at preventing food-related sickness. This work compares traditional farming with greenhouses and indoor vertical farming focusing on the challenges and the opportunities for each category. The scope of this work was to stress the role of indoor vertical farming towards this direction. Indoor vertical farms can produce high quality and virus-free products that can be locally distributed, inside the urban environment that such investments take place, saving annually millions of tons CO2 emissions. Beyond that, in this work it was pointed out how energy plays a role in food safety in such systems. It was stressed that indoor vertical farms can act as a demand response aggregator. In large scale units it could play a role to adjust their production according to different electricity prices offered in different time zones throughout the day. This way, the owners under a multi-value business model will create the opportunity to the vertical farm owners not only to improve their production but at the same time absorb inexpensive electricity offered, by creating an additional profit mechanism (multiple revenue streams) under such an approach by entering into contracts with companies in a utility electric region.
Dafni Despoina Avgoustaki; George Xydis. How energy innovation in indoor vertical farming can improve food security, sustainability, and food safety? Advances in Food Security and Sustainability 2020, 5, 1 -51.
AMA StyleDafni Despoina Avgoustaki, George Xydis. How energy innovation in indoor vertical farming can improve food security, sustainability, and food safety? Advances in Food Security and Sustainability. 2020; 5 ():1-51.
Chicago/Turabian StyleDafni Despoina Avgoustaki; George Xydis. 2020. "How energy innovation in indoor vertical farming can improve food security, sustainability, and food safety?" Advances in Food Security and Sustainability 5, no. : 1-51.
Knowledge sharing between different types of organisations, in this case the University-Industry (U-I) relation, contains barriers related to the differentiation of structure and purpose for each organisation. Both the university and industry have to make sure that they have access to data and information. This accessibility enables the value-added process of transforming data into knowledge. The purpose of this paper is the analysis of U-I cooperation– especially under the new online requirements – an illustration of how the knowledge is created and shared in the organisation based on the socialisation, externalisation, combination, and internalisation (SECI) model and how this is aligned to the value proposition. As a knowledge management example case, a database for the Centre for Energy Technologies of Aarhus University was developed that will overtime help the university to increase its value proposition and be the heart of knowledge exchange with the industry in an organised way. The value of this work is intended to pave the way in building structured working relations between the industry and academia, facilitating the means in order to achieve a higher degree of overall efficiency.
Emmanouil Tzavidas; Peter Enevoldsen; George Xydis. A University-industry knowledge transfer online education approach via a cloud-based database global solution. Smart Learning Environments 2020, 7, 1 -16.
AMA StyleEmmanouil Tzavidas, Peter Enevoldsen, George Xydis. A University-industry knowledge transfer online education approach via a cloud-based database global solution. Smart Learning Environments. 2020; 7 (1):1-16.
Chicago/Turabian StyleEmmanouil Tzavidas; Peter Enevoldsen; George Xydis. 2020. "A University-industry knowledge transfer online education approach via a cloud-based database global solution." Smart Learning Environments 7, no. 1: 1-16.
In a golf club, players have the chance to rent a buggy to cover the distances in the field. These buggies are electric vehicles that need to be charged and the grid is used to supply the electricity required. In Los Naranjos Golf Club they have no time to charge the cars in between rounds so it is interesting to look for renewable energy as the sun could provide an extra charge while the car is on the field. For this matter, a specific study in situ has been implemented. The estimation of the savings using solar panels with 250 W power was reviewed to economically analyze and calculate the extended range provided by such a system. The results with a 50-car fleet show a return on investment within the fifth year and can lead to an increase in the range in 10 holes for the worst-case scenario (December). The techno-economic analysis, proved that a future investment in solar buggies will results in Average Annual Benefits of EUR15,607 with the total Capital Cost at EUR75,000.
Ángel Luis Avilés Orgaz; Jörn Böttcher; George Xydis. Solar-powered golf buggies charging on the road. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects 2020, 1 -11.
AMA StyleÁngel Luis Avilés Orgaz, Jörn Böttcher, George Xydis. Solar-powered golf buggies charging on the road. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects. 2020; ():1-11.
Chicago/Turabian StyleÁngel Luis Avilés Orgaz; Jörn Böttcher; George Xydis. 2020. "Solar-powered golf buggies charging on the road." Energy Sources, Part A: Recovery, Utilization, and Environmental Effects , no. : 1-11.
Vertical farming is a novel type of farming for fresh food production in the urban environment. Vertical farms are located in indoor environments with artificial solar radiation, completely insulated and protected from outdoor environmental conditions. Since cultivated plant species need many hours of light daily to meet their growth requirements, energy costs are very high, which can be an inhibiting factor for the advancement of the technology. In this research study, we tested the growth rate of basil plants (Genovese species) under two lighting systems. At first, the plants were grown under 16 h of continuous light, and in the second lighting system, under a photoperiod of 14 h with intermittent light. The light intensity was stable in both treatments. The purpose was to determine if intermittent light exposure could reduce the energy consumption of basil grown in indoor environments sufficiently and efficiently without adversely affecting the growth rate and biomass production of the plants. The results of the study showed that the intermittent lighting system, in which light was emitted intermittently in short (10-min) light cycles, did not affect negatively the quality and quantity of basil plants. It was found that the short light intervals were not sufficient to attain the optimal photosynthetic efficiency of the cultivation, while the overall photosynthetic rate did not decrease significantly under the indoor conditions. Finally, the evaluation of the energy footprint under various light treatments can have a positive impact on the energetic, economic, business, and ecological phases of indoor food production.
Dafni Despoina Avgoustaki; Jinyue Li; George Xydis. Basil plants grown under intermittent light stress in a small-scale indoor environment: Introducing energy demand reduction intelligent technologies. Food Control 2020, 118, 107389 .
AMA StyleDafni Despoina Avgoustaki, Jinyue Li, George Xydis. Basil plants grown under intermittent light stress in a small-scale indoor environment: Introducing energy demand reduction intelligent technologies. Food Control. 2020; 118 ():107389.
Chicago/Turabian StyleDafni Despoina Avgoustaki; Jinyue Li; George Xydis. 2020. "Basil plants grown under intermittent light stress in a small-scale indoor environment: Introducing energy demand reduction intelligent technologies." Food Control 118, no. : 107389.
Natural gas consumption forecasting is crucial for transmission system operators, distribution system operators, traders, and other players in the market. This work collects natural gas forecasting scientific works in accordance with the forecasting tool used by Energinet, the Danish transmission system operator. The work provides an analytical description on the long-term stability and security of the natural gas transmission system in Denmark. This work offers a detailed scientific directory on natural gas forecasting, presenting the so far vaguely described market in a more structured manner. The paper was focused on presenting the latest findings on identifying the selection each time of the appropriate prognostic model for each application based on: ① the option for supporting double seasonality, ② various exogenous variables, ③ suitability for day-ahead forecasting, and ④ ease of use and all these versus Energinet’s current model.
Orhan Altuğ Karabiber; George Xydis. A review of the day-ahead natural gas consumption in Denmark: starting point towards forecasting accuracy improvement. International Journal of Coal Science & Technology 2020, 8, 1 -22.
AMA StyleOrhan Altuğ Karabiber, George Xydis. A review of the day-ahead natural gas consumption in Denmark: starting point towards forecasting accuracy improvement. International Journal of Coal Science & Technology. 2020; 8 (1):1-22.
Chicago/Turabian StyleOrhan Altuğ Karabiber; George Xydis. 2020. "A review of the day-ahead natural gas consumption in Denmark: starting point towards forecasting accuracy improvement." International Journal of Coal Science & Technology 8, no. 1: 1-22.
Energy markets with a high penetration of renewables are more likely to be challenged by price variations or volatility, which is partly due to the stochastic nature of renewable energy. The Danish electricity market (DK1) is a great example of such a market, as 49% of the power production in DK1 is based on wind power, conclusively challenging the electricity spot price forecast for the Danish power market. The energy industry and academia have tried to find the best practices for spot price forecasting in Denmark, by introducing everything from linear models to sophisticated machine-learning approaches. This paper presents a linear model for price forecasting—based on electricity consumption, thermal power production, wind production and previous electricity prices—to estimate long-term electricity prices in electricity markets with a high wind penetration levels, to help utilities and asset owners to develop risk management strategies and for asset valuation.
Jannik Schütz Roungkvist; Peter Enevoldsen; George Xydis. High-Resolution Electricity Spot Price Forecast for the Danish Power Market. Sustainability 2020, 12, 4267 .
AMA StyleJannik Schütz Roungkvist, Peter Enevoldsen, George Xydis. High-Resolution Electricity Spot Price Forecast for the Danish Power Market. Sustainability. 2020; 12 (10):4267.
Chicago/Turabian StyleJannik Schütz Roungkvist; Peter Enevoldsen; George Xydis. 2020. "High-Resolution Electricity Spot Price Forecast for the Danish Power Market." Sustainability 12, no. 10: 4267.
Global changes in temperature will likely change energy use and electricity production capacity. Considering the relationship between climate change and energy resource use, changes in temperature and the frequency and intensity of extreme events will affect how much energy is produced and consumed. The green economy and green growth are located at the heart of the fight against climate change in creating sustainable development. This paper considers the multidirectional relations between climate change, energy resources, and sustainable development including the perspective of a green economy via a technoeconomic analysis. A link among energy resources, climate changes and sustainable development has been displayed via a technoeconomic analysis in the case study, which was focused on taking into consideration the needs of the hydroponic units, the product selling price, the electricity price of the wind farm (WF), and at the same time the energy demand, under a nexus approach. Via the technoeconomic analysis, it was proven that moving on to smaller investments of 2 MWs is more efficient compared to larger projects e.g. 18 MWs, however, this cannot be considered immediately as the preferred solution since it is always a matter of impact on the local society.
Meltem Ucal; George Xydis. Multidirectional Relationship between Energy Resources, Climate Changes and Sustainable Development: Technoeconomic Analysis. Sustainable Cities and Society 2020, 60, 102210 .
AMA StyleMeltem Ucal, George Xydis. Multidirectional Relationship between Energy Resources, Climate Changes and Sustainable Development: Technoeconomic Analysis. Sustainable Cities and Society. 2020; 60 ():102210.
Chicago/Turabian StyleMeltem Ucal; George Xydis. 2020. "Multidirectional Relationship between Energy Resources, Climate Changes and Sustainable Development: Technoeconomic Analysis." Sustainable Cities and Society 60, no. : 102210.
This study investigates how artificial intelligence (AI) at offshore wind farms could potentially both improve meeting Annual Energy Production (AEP) targets as well as reduce avian mortality rates resulting from turbine collision. While turbine-related bird deaths are widely skewed in the current literature, this research aims to completely reduce the already low bird mortality statistic caused via wind power operation by providing solid evidence of true mortality rates. Additionally, securing long-term investments with stakeholders and increasing market size will be a side effect of the undergone investigation. This research took place along the Coastal Regions of Denmark and in California, USA, where heavy migratory flyways lie near offshore Vestas wind parks. As a collaborative research partner to Aarhus University, Vestas Wind Systems A/S engaged in research and testing throughout the duration of this study. A literature review comparing existing bird tracking technologies used for collision-avoidance purposes is examined and a SWOT analysis performed. This paper addresses gaps in the existing technologies while also introducing a new and improved approach to siting future wind projects. Since wind turbine curtailment can cost manufacturers and owners up to $100 per turbine per hour, this research additionally aims to reduce curtailment onset thanks to AI technology learning site-specific spatial patterns. By combining multi-sensory information from motion-sensor cameras, eBird database, magnetic fields and Doppler radar the following paper illustrates how such information can deem useful in improving collision-avoidance systems while also providing more knowledge of local conditions for both existing and future wind projects.
Eldina Salkanović; Peter Enevoldsen; George Xydis. Applying AI-Based Solutions to Avoid Bird Collisions at Wind Parks. Springer Proceedings in Energy 2020, 111 -124.
AMA StyleEldina Salkanović, Peter Enevoldsen, George Xydis. Applying AI-Based Solutions to Avoid Bird Collisions at Wind Parks. Springer Proceedings in Energy. 2020; ():111-124.
Chicago/Turabian StyleEldina Salkanović; Peter Enevoldsen; George Xydis. 2020. "Applying AI-Based Solutions to Avoid Bird Collisions at Wind Parks." Springer Proceedings in Energy , no. : 111-124.