Proceedings of the 8th International Conference on Renewable Electrical Power Sources最新文献

Automation of a copper wire manufacturing process using up-casting method – subsystem for induction heating 上铸法铜线制造过程的自动化——感应加热分系统

Proceedings of the 8th International Conference on Renewable Electrical Power Sources Pub Date : 2020-11-02 DOI: 10.24094/mkoiee.020.8.1.279

N. Kovačević, M. Stevic, Miloš Milešević, S. Maksimović, Đorđe Dihovični, Z. Stević, Belgrade Serbia Mikroelektronika

引用次数: 0

Numerical evaluation of aerodynamic performances of vertical-axis wind turbine rotor with flow concentrator 带集中器的垂直轴风力机转子气动性能数值评价

Proceedings of the 8th International Conference on Renewable Electrical Power Sources Pub Date : 2020-10-29 DOI: 10.24094/mkoiee.020.8.1.135

J. Svorcan, Ognjen Peković, Toni Ivanov, M. Vorkapić

{"title":"Numerical evaluation of aerodynamic performances of vertical-axis wind turbine rotor with flow concentrator","authors":"J. Svorcan, Ognjen Peković, Toni Ivanov, M. Vorkapić","doi":"10.24094/mkoiee.020.8.1.135","DOIUrl":"https://doi.org/10.24094/mkoiee.020.8.1.135","url":null,"abstract":"With wind energy extraction constantly increasing, the interest in small-scale urban wind turbines is also expanding. Given that these machines often work in adverse operating conditions (Earth’s boundary layer, vortex trails of surrounding objects, small and changeable wind speeds), additional elements that locally augment wind velocity and facilitate turbine start may be installed. This paper investigates possible benefits of adding an optimized flow concentrator to a vertical-axis wind turbine (VAWT) rotor. Three-dimensional, unsteady, turbulent, incompressible flow simulations of both isolated rotor consisting of three straight blades and a rotor with flow concentrator have been performed in ANSYS FLUENT by finite volume method for several different operational regimes. This type of flow simulations is challenging since flow angles are high, numerous flow phenomena and instabilities are present and the interaction between the blades and detached vortices can be significant. The rotational motion of the blades is solved by the unsteady Sliding Mesh (SM) approach. Flow field is modeled by Unsteady Reynolds Averaged Navier-Stokes (URANS) equations with k-ω SST turbulence model used for closure. Both quantitative and qualitative examinations of the obtained numerical results are presented. In particular, the two computed power coefficient curves are compared and the advantages of installing a flow concentrator are accentuated.","PeriodicalId":346160,"journal":{"name":"Proceedings of the 8th International Conference on Renewable Electrical Power Sources","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124186654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis and characterization of epoxy resin coating with improved fire resistance by the addition of modified tannic acid 改性单宁酸改性环氧树脂涂料的合成与表征

Proceedings of the 8th International Conference on Renewable Electrical Power Sources Pub Date : 2020-10-28 DOI: 10.24094/mkoiee.020.8.1.35

Andreja Živković, N. Tomić, M. Vuksanović, A. Marinković

{"title":"Synthesis and characterization of epoxy resin coating with improved fire resistance by the addition of modified tannic acid","authors":"Andreja Živković, N. Tomić, M. Vuksanović, A. Marinković","doi":"10.24094/mkoiee.020.8.1.35","DOIUrl":"https://doi.org/10.24094/mkoiee.020.8.1.35","url":null,"abstract":"The paper presents a new process for obtaining eco-epoxide materials with reduced combustibility or completely non-combustible, which are synthesized from bio-renewable raw materials, whose production process consists of two stages. A particular aspect of multiple environmental significance is the use of bio-renewable resources and the reduction of the share of the toxic epoxy component in the production of epoxy materials. The first stage considers the synthesis epoxy resin components: epoxy functionalized tannic acid (TA) – ETA, and synthesis of phosphate derivatives of TA - glycidyl ester of TA modified by phosphoric acid (PGET). The second stage considers the synthesis of bio-epoxy resins using ETA and PGET that are used as a replacement of the epoxy resin component (A) – bisphenol A based epoxy in a ratio 25-100% as a reactive diluent to obtain products that can be used in the construction and other industrial fields and have reduced combustibility or completely non-combustible. The second part presents the results of thermal and mechanical tests for some of the obtained derivatives. The addition of 25% of TA derivate improved the toughness as well as the tensile strength of epoxy material. Thermogravimetry showed that samples containing tannin epoxide showed more residue left. Partial or full replacement of the epoxy component with a tannin component produces eco-friendly material with while significantly increased fire resistance (V-2 to V-0).","PeriodicalId":346160,"journal":{"name":"Proceedings of the 8th International Conference on Renewable Electrical Power Sources","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121006681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Synthesis of micro-sized silver particles suitable for thick film contacts on solar cells 适用于太阳能电池厚膜触点的微细银粒子的合成

Proceedings of the 8th International Conference on Renewable Electrical Power Sources Pub Date : 2020-10-28 DOI: 10.24094/mkoiee.020.8.1.29

S. Dimitrijević, S. Dimitrijević, M. Miliciani, Ž. Kamberović, Z. Cherkezova-Zheleva

引用次数: 0