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6th International Conference En-Re Energy & Responsibility : Book of Extended Abstracts

Opis: In the context of escalating climate challenges, the EnRe conference is dedicated to exploring pathways to climate neutrality and the sustainable green transition. The conference is focused on the development and implementation of innovations supporting the transformation of energy systems, industrial systems, and living systems, all with the goal of creating a sustainable future with net-zero emissions. The conference brings together experts, researchers, policymakers, and business leaders to share their experiences, research, and visions. The aim of the conference is to foster collaboration and exchange of ideas, and to collectively develop comprehensive approaches and strategies for achieving climate neutrality. This conference is not just a knowledge exchange, but also a platform for encouraging concrete actions that will ensure a greenerand more sustainable future for our next generations to come.
Ključne besede: alternative energy systems, dynamic tariffing, electrical machines and drives, energy conversions, financing energy projects, nuclear energy, conventional energy systems, climate changes - climate pan, mathematical methods in engineering, micro and nano energy, low-carbon technologies and strategies, renewable energy technologies heating and cooling systems, smart buildings, cities and networks, policies and strategies for renewable energy sources, energy efficiency and the climate
Objavljeno v DKUM: 17.05.2024; Ogledov: 205; Prenosov: 19
.pdf Celotno besedilo (10,40 MB)
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The Evaluation of Torrefaction Efficiency for Lignocellulosic Materials Combined with Mixed Solid Wastes
Maja Ivanovski, Darko Goričanec, Danijela Urbancl, 2023, izvirni znanstveni članek

Opis: The paper presents the results of research aimed at evaluating the possibility of using selected biomass wastes to produce solid biofuels. In this work, the thermochemical properties of two lignocellulosic biomasses, namely, miscantshus (Miscanthus × Giganteus) and hops (Humulus lupulus), and non-lignocellulosic biomass, namely, municipal solid waste, and their mixtures (micanthus + municipal solid waste and hops + municipal solid waste) were studied using the torrefaction process as the main method for investigation. The effects of various torrefaction temperatures (250, 300, and 350 °C) and times (30 and 60 min) were evaluated. Proximate and ultimate analyses were performed on the torrefied samples. The following can be stated: as the torrefaction temperature and time increased, mass and energy yields decreased while the higher heating values (HHVs) and fuel ratios (FRs) increased, together with carbon contents (C). In addition, energy on return investment (EROI) was studied; the maximum EROI of 28 was achieved for MSW biochar at 250 °C for 30 min. The results of studying greenhouse gas emissions (GHGs) showed a reduction of around 88% when using torrefied biochar as a substitute for coal. In sum, this study shows that torrefaction pre-treatment can improve the physicochemical properties of raw biomasses to a level comparable with coal, and could be helpful in better understanding the conversion of those biomasses into a valuable, solid biofuel.
Ključne besede: torrefaction, waste biomass, renewable energy, fuel ratio, greenhouse gas emission, GHG
Objavljeno v DKUM: 29.03.2024; Ogledov: 153; Prenosov: 13
.pdf Celotno besedilo (3,69 MB)
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The use of differential evolution to determine maximum generation and load values in the distribution network
Eva Tratnik, Janez Ribič, Matej Pintarič, Miran Rošer, Gorazd Štumberger, Miloš Beković, 2022, izvirni znanstveni članek

Opis: By integrating renewable energy sources into the existing distribution network, the characteristics and local stability of the network is highly impacted. The network, which was built with the goal of a directed energy flow from large conventional sources connected to the transmission network via the distribution network to consumers, can change the direction of the energy flow. The adoption of environmental commitments and directives encourages the integration of local dispersed energy sources, which can worsen voltage conditions in the distribution network. To avoid excessive local production, distribution network operators must limit the installation of new generati on units, as it is necessary to take into account the quality of power supply by monitoring its network parameters, such as the appropriate voltage profi le and the rati o between acti ve and reacti ve power. On the other hand, excessive loads due to the mass transiti on of household heati ng and transport towards electricity can also pose a problem for high-quality electricity supply due to the excessive voltage drop. The arti cle presents an algorithm for determining the maximum size of unit producti on and the maximum load at a node in the distributi on network. Also demonstrated is the use of variable tap transformer technology, which adjusts the tap of the transformer to provide an appropriate voltage profi le in the network. The enti re analysis was performed on a model of a real medium-voltage network, in which solar and hydropower plants are already included. The model was verifi ed by comparing its calculated values with actual measurements. The goal was to determine the size of the unit’s maximum producti on, as well as the size of the maximum load, by using the diff erenti al evoluti on algorithm, while keeping voltage profi les within the permissible limits. The results of the analysis are presented in the article.
Ključne besede: distribution network, renewable energy sources, optimisation method, voltage profile
Objavljeno v DKUM: 30.10.2023; Ogledov: 355; Prenosov: 11
.pdf Celotno besedilo (1,63 MB)
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Proceedings of the international conference on innovations in energy engineering & cleaner production
2022, zbornik recenziranih znanstvenih prispevkov na mednarodni ali tuji konferenci

Ključne besede: energetics, renewable energy sources, production, alternative energy sources, environmental protection
Objavljeno v DKUM: 27.10.2023; Ogledov: 415; Prenosov: 13
.pdf Celotno besedilo (7,48 MB)
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Appropriate criteria for a transition from conventional to sustainable warehousing
Anita Vasileva, Ana M. Lazarevska, Kristina Jakimovska, 2022, izvirni znanstveni članek

Opis: This research paper conducts the process of selecting the criteria that are the most appropriate for a transition from conventional to sustainable warehousing. SWOT analysis is used to emphasise the weaknesses of conventional and the strengths of sustainable warehousing to select the most appropriate for the herein presented study. The results have been verified via a questionnaire filled out by professionals in economics, logistics and warehousing, and mechanical engineering. be added under the methodology section. The results gave the five most important criteria by transforming the conventional into sustainable warehousing. Finally, the paper concluded that renewable energy sources are the most important criteria for transforming by conventional to sustainable warehousing by environmental aspects, as well as the smart technology is above all other criteria by economic aspect. Moreover, providing personal protection equipment and servicing machinery and vehicle on regular basis are the two mainly criteria by social (safety) aspect.
Ključne besede: logistics, sustainable warehousing, SWOT analysis, renewable energy
Objavljeno v DKUM: 13.07.2023; Ogledov: 280; Prenosov: 29
.pdf Celotno besedilo (758,91 KB)
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5th International Conference EnRe - Energy & Responsibility : book of extended abstracts
2022, zbornik

Opis: The tendency to improve energy devices, the impact of environmental factors and the development of new technologies for the exploitation of sustainable resources contribute to the fact that we have witnessed intensive energy development in the last decade. The two most important Slovenian energy pools, located in Velenje and Krško, are at the turning point of renovation, and are facing major challenges in the design and planning of modern energy devices. The current generation faces a great ethical responsibility to leave their descendants a world with as little human impact on the environment as possible. Therefore, communication between experts and researchers, discussion and exchange of different views for the future is of the utmost importance, which is exactly the purpose of the EnRe Conference.
Ključne besede: renewable energy and energy storage systems, classic energy systems, policies and strategies for RES, alternative energy systems, energy conversions, energy transfer, electrical machine, thermal machines, mathematical methods in energy engineering, environmental protection, micro and nano energetics, hydrogen technologies, low carbon technologies and strategies, nuclear energy, smart buildings, smart cities and smart grids
Objavljeno v DKUM: 09.06.2022; Ogledov: 1331; Prenosov: 89
.pdf Celotno besedilo (14,78 MB)
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Design of geometry and numerical simulation of the operating characteristic of the rotor of the wind turbine : diplomsko delo
aljaž Janič, 2018, diplomsko delo

Opis: The diploma thesis consists of design and numerical simulation of the wind turbine. Geometries are designed according to two theories, the Betz theory and the Schmitz theory. I used Solidworks for 3D modeling of the both rotors. Using Ansys software package, we performed numerical simulations of a rigid body for two different wind speed regimes. We were interested in the angular velocity of the spinning blades, which in combination with moment give us power.
Ključne besede: Renewable energy, wind energy, numerical simulation, wind turbine, blade design, Betz and Schmitz theory
Objavljeno v DKUM: 09.08.2018; Ogledov: 1579; Prenosov: 187
.pdf Celotno besedilo (2,19 MB)

Climate change and ecological scarcity as an urgent reason to think about the environmental policy
Edeltraud Günther, Daria Meyr, 2016, samostojni znanstveni sestavek ali poglavje v monografski publikaciji

Ključne besede: climate change, environmental policy, transport, logistics, clean energy, renewable energy
Objavljeno v DKUM: 10.05.2018; Ogledov: 1210; Prenosov: 86
.pdf Celotno besedilo (1,18 MB)
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Public support of solar electricity and its impact on households - prosumers
Jarmila Zimmermannová, Adam Pawliczek, Petr Čermák, 2018, izvirni znanstveni članek

Opis: Background and Purpose: Currently, the idea of households - prosumers is broadly discussed in public governments, mainly in connection with both the energy security issues and the environmental issues. Therefore, the main goal of this paper is to present new agent model of household - prosumer and to compare two scenarios – “off grid household” and “on grid household”. The additional goal is to evaluate the impact of public support of solar electricity on the economic efficiency of household – prosumer projects (systems). Design/Methodology/Approach: The model is structured as a micro-level agent model, representing one household – prosumer. The model has the following general characteristics: one household with own electricity generation (photovoltaic panels), battery and in case of “on grid household” also connection to the grid. The main goal of the agent is to cover electricity consumption in household with minimal costs. The agent model of prosumer is tested and validated, using the empirical data. Results: The highest level of subsidy has significant impact on the economic indicators of selected scenarios. It causes lower investment costs at the beginning of the project and consequently shorter payback period (3-4 years earlier), positive cumulative cash flow, net present value and IRR in earlier period (approximately 5-10 years earlier, depending on the scenario). Conclusion: We can recommend to the government to continue with current system of subsidies, since it contributes to better economic indicators of particular solar electricity projects. On the other hand, the level of subsidy should be at least the same as in current year 2017, for the purposes of representing the significant part of the investment costs. Low level of subsidy has negligible impact on the economic indicators of households – prosumers projects. The developed agent model is suitable for the evaluation of economic impact of public support on households – prosumers.
Ključne besede: renewable electricity, photovoltaics, prosumers, households, public support, agent model, energy model
Objavljeno v DKUM: 07.05.2018; Ogledov: 1315; Prenosov: 397
.pdf Celotno besedilo (2,04 MB)
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