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Innovative approaches to wear reduction in horizontal powder screw conveyors : a design of experiments-guided numerical study
Marko Motaln, Tone Lerher, 2024, original scientific article

Abstract: Numerical simulations play a vital role in the modern engineering industry, especially when faced with interconnected challenges such as particle interactions and the structural integrity of conveyor systems. This article focuses on the handling of materials and emphasizes the importance of using parametric numerical analysis to improve efficiency, reduce wear, and enhance the structural integrity of horizontal screw conveyors. Through the utilization of the Design of Experiments, we systematically investigated critical parameters such as screw pitch, clearance, wear, rotational velocity, and additional structural factors. This examination was carried out within a well-defined parametric framework, utilizing a combination of software tools provided by the Ansys suite and Minitab. The findings demonstrate the effectiveness of the Design of Experiments analysis in achieving improved performance and provide valuable insights for engineers and researchers involved in the design of conveyor systems. Furthermore, this comprehensive approach clarifies how conveyor systems respond to changes in parameters and highlights the complex interaction between transported particles and the conveyor system. We present a detailed analysis that clarifies the complex relationships and dependencies among different parameters, providing engineers and researchers with valuable insights. By understanding the interactions of these factors, the methodology provides not only results but also a strategic framework for advancing conveyor system design and engineering practices.
Keywords: discrete element method, design optimization, horizontal screw conveyors, parametric study, conveying equipment, bulk handling, bulk solids, abrasive wear, screw conveyor, FEA, performance analysis
Published in DKUM: 09.04.2024; Views: 68; Downloads: 6
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Special issue on “Process design and sustainable development”
Peter Glavič, 2023, preface, editorial, afterword

Keywords: sustainability, engineering, design
Published in DKUM: 02.04.2024; Views: 40; Downloads: 2
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Food Waste to Energy through Innovative Coupling of CHP and Heat Pump
Jan Drofenik, Danijela Urbancl, Darko Goričanec, Zdravko Kravanja, Zorka Novak-Pintarič, 2023, original scientific article

Abstract: This paper presents the conceptual design of a technological solution for the efficient conversion of food waste into heat and power. The distribution and composition of food loss and waste at different stages of the food supply chain in Slovenia and their potential for biogas production were determined. It was found that more than 50% of food waste comes from households. Therefore, a small plant was designed to convert food waste into biogas, which was innovatively coupled with a combined heat and power (CHP) unit and a heat pump. This doubles the amount of heat generated compared to conventional cogeneration. Based on the capacity of a micro commercial CHP unit, 3330 households (about 8000 residents) would supply food waste. The heat generated could replace 5% of the natural gas used for domestic water heating. The payback period would be 7.2 years at a heat price of about 80 EUR/MWh, however, for municipalities with more than 40,000 inhabitants the payback period would be reduced to less than 3 years. The cost price of the heat generated by this system would be about 25 EUR/MWh, taking into account the government subsidy for the operation of the CHP unit.
Keywords: food waste to energy, biogas, combined heat and power, CHP, heat pump, efficiency, conceptual design, preliminary economic assessment, sensitivity analysis
Published in DKUM: 16.02.2024; Views: 2971; Downloads: 6
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Tourism experience in accessible tourism : designing a mobile application for the deaf and hard of hearing
Tjaša Alegro, Marica Ilić, Milica Rančić Demir, 2022, independent scientific component part or a chapter in a monograph

Abstract: How someone experiences a tourist experience depends on several factors. This article will focus on ways to ensure active participation and thus a pleasant and memorable experience for people with disabilities, specifically people with hearing problems – the deaf and hard of hearing. With the development of ICT technology, the possibilities for developing tourist products intended for the deaf and hard of hearing are even greater and can be friendlier to them. Various mobile applications complement a city’s tourist products and services and are more than a welcome help for people with special needs. With an innovative Design Thinking method suitable for planning projects or designing services or products intended for end users, we designed an idea for a mobile application for Ljubljana that is tailored to deaf and hard of hearing tourists, as Slovenia does not yet have a similar application. We designed the product idea based on an overview of good practices. Through five phases of the Design Thinking method, we analysed the indispensable elements of the mobile application for deaf and hard of hearing tourists and evaluated it through the HEART framework matrix developed for user experience assessment.
Keywords: experience, measuresaccessible tourism, deaf, hard of hearing, Design Thinking
Published in DKUM: 17.01.2024; Views: 124; Downloads: 7
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The Influence of Increased Moderator Temperature on the Nuclear Characteristics of the NPP Krško
Marjan Kromar, Bojan Kurinčič, 2019, published scientific conference contribution

Abstract: NPP Krško safety analysis has been performed in such a way to allow operation with primary system average coolant temperature - Tavg inside a prescribed range, which constitute the socalled operating window. The Tavg window enables certain flexibility to select an optimum value within the Tavg range taking into account safety, operational and economical considerations. Increase of the reactor coolant temperature in general improves thermodynamic efficiency of the Pressurized Water Reactor (PWR) plant yielding to increase in the electricity production. However, higher temperature causes lower water density in the reactor core altering the neutron moderation and consequently neutron transport in the reactor. This impact on the nuclear core characteristics is investigated for the NPP Krško reactor core.
Keywords: pressurized water reactor, nuclear design calculations, reactor coolant temperature optimization, critical boron concentration, Nuclear Powe Plant Krško
Published in DKUM: 05.12.2023; Views: 208; Downloads: 11
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Towards a Catalogue of Self-Sovereign Identity Design Patterns
Špela Čučko, Vid Keršič, Muhamed Turkanović, 2023, original scientific article

Abstract: Self-sovereign identity (SSI) is a user-centric, decentralised identity approach that provides a means for identification, authentication, and authorisation without the involvement of external entities, responsible for identity provisioning and management in current centralised and federated approaches. In general, the basic building blocks of an SSI system include decentralised identifiers, verifiable credentials, identity wallets, a verifiable data registry, and three main actors: issuer, identity holder, and verifier. Even though the SSI field is dominated by proposals, SSI systems can be implemented in different ways, which is reflected in the absence of a well-defined architecture. Thus, the best implementation is still a matter of research, the requirements of the individual system, and its field of application. However, well-designed and implemented systems are crucial to avoiding failures, speeding up the development process, ensuring high quality, and the broader adoption of SSI solutions. Hence, the main objective of this study was to identify design patterns and good practices of the SSI ecosystems by reviewing and analysing the literature, technical documentation, and existing SSI implementations. Therefore, the study is built on existing knowledge, and presents a comprehensive catalogue of thirty-five SSI design patterns that can serve as a starting point for a possible SSI system design.
Keywords: self-sovereign identity, decentralised identity, design patterns, decentralised identifiers, verifiable credentials, blockchain, verifiable data registry, identity wallets
Published in DKUM: 05.12.2023; Views: 240; Downloads: 24
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Development of mathematical models in explicit form for design and analysis of axial flux permanent magnet synchronous machines
Franjo Pranjić, Peter Virtič, 2020, original scientific article

Abstract: This article proposes a methodology for the design of double-sided coreless axial flux permanent magnet synchronous machines, which is based on a developed model for calculating the axial component of the magnetic flux density in the middle of the distance between opposite permanent magnets, which also represents the middle of the stator. Values for different geometric parameters represent the input data for the mathematical model in explicit form. The input data are calculated by using a simplified finite element method (FEM), which means that calculations of simplified 3D models are performed. The simplified model consists of two rotor disks with surfacemounted permanent magnets and air between them, instead of stator windings. Such a simplification is possible due to similar values of permeability of the air and copper. For each simplified model of the machine the axial component of the magnetic flux density is analyzed along a line passing through the center of opposite permanent magnets and both rotor disks. Values at the middle of the distance between the opposite permanent magnets are the lowest and are therefore selected for the input data at different stator, rotor disks and permanent magnets (PM) thicknesses. Such input data enable the model to consider the nonlinearity of materials.
Keywords: axial flux, analysis, coreless, development, design, explicit form, finite element method, mathematical models, permanent magnet, synchronous
Published in DKUM: 01.12.2023; Views: 330; Downloads: 10
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