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Abstract: The present work focuses on the comparison of the capabilities of Blade Element Momentum Theory, with and without the high induction factor value model and Computational Fluid Dynamics modelling in relation to experimental measurements of the power coefficient for a model-sized horizontal axial wind turbine. Initially, an analytical investigation was performed to obtain the power coefficient curve. Furthermore, three-dimensional numerical simulations were performed, where a lot of effort was devoted to the preparation of a low y+ structured mesh. Analytical and numerical results of the power coefficient were compared with experimental results, which were obtained with our own conducted experiments in the wind tunnel. The most significant conclusions are that the classic BEM method deviates from measured data in the entire range of tip speed ratios, the BEM method with Spera correction predicts a significantly better agreement with experimental measurements compared to the classic BEM method, especially the part where the power coefficient decreases and finally that CFD computations can accurately predict the performance of wind turbines and compute the flow around an aerofoil of the blade.
Keywords: BEM method, CFD, measurements, wind turbine
Published in DKUM: 06.11.2025; Views: 0; Downloads: 1
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Abstract: Wind energy in Slovenia has not yet achieved a significant share in the energy resource mix, due primarily to the limited number of suitable locations and opposition from local communities. Nevertheless, interest in wind power plants is increasing, as they represent significant potential for utilising renewable energy sources. The paper analyses the economic viability of wind farm installation and electricity production at the proposed Ojstrica site in the Dravograd Municipality. Two scenarios were considered, involving wind turbines with capacities of 3.5 MW and 7 MW. Based on wind speed data, turbine power curves, and an electricity selling price of 75 EUR/MWh, the study calculated the maximum investment costs for each turbine type to ensure economic viability under the condition of a net present value (NPV) equal to zero. The results show that the maximum allowable investment is 5.99 million EUR for the 3.5 MW turbine and 15.60 million EUR for the 7 MW turbine.
Keywords: Ojstrica, wind turbines, economic viability, renewable energy, net present value
Published in DKUM: 16.06.2025; Views: 0; Downloads: 10
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Abstract: Diplomsko delo predstavlja projekt vetrne elektrarne na območju Goliča. V začetnih poglavjih je opisano samo delovanje vetrnih elektrarn ter razlike med vetrnimi elektrarnami moči 3,45 MW ter 6,2 MW. V nadaljevanju sledi podroben opis predlaganih variant postavitve ter posamezne analize na tem območju.
Keywords: Vetrna elektrarna, vetrne turbine moči 3, 45 MV, 6, 2 MV, daljnovod, obnovljivi viri energije.
Published in DKUM: 13.02.2025; Views: 0; Downloads: 41
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Abstract: Diplomsko delo obravnava zgradbo in delovanje OBD (On-Board Diagnostics) sistemov s poudarkom na emisijah CO2 in NOx. OBD sistemi so ključni za nadzor in diagnostiko vozil, saj omogočajo spremljanje delovanja motorja in zaznavanje napak, ki lahko vplivajo na emisije škodljivih snovi. Delo obravnava tudi uporabo AdBlue, ki se uporablja v dizelskih vozilih za zmanjšanje emisij NOx. Sistem vbrizgava AdBlue v izpušni sistem, kjer se raztopina v reakciji z vročimi izpušnimi plini pretvori v amoniak, ki nato v katalizatorju zmanjša emisije NOx. Pravilna uporaba AdBlue je ključna za zmanjšanje emisij NOx brez večjega vpliva na emisije CO2, s čimer se izboljša okoljska učinkovitost vozil. Delo vključuje pregled komponent, ki so ključne za natančno spremljanje emisij in pravilno delovanje sistema za zmanjševanje emisij. OBD sistemi so zasnovani tako, da zaznajo odstopanja v emisijah in sprožijo opozorila ali prilagoditve v delovanju motorja, da zagotovijo skladnost z okoljskimi predpisi. S pravilno vzdrževanim OBD sistemom in uporabo AdBlue lahko vozila dosežejo optimalno delovanje in skladnost z okoljskimi standardi.
Keywords: OBD, CO2, NOx, AdBlue
Published in DKUM: 11.02.2025; Views: 0; Downloads: 19
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Abstract: Diplomsko delo raziskuje potencialni vpliv infrastrukture vetrne energije na populacije divjih živali, vključno z izzivi in ukrepi za omilitev. Glede na prehod na obnovljive vire energije postaja energija vetra neizogiben del energetske krajine, vendar ima postavitev vetrnih turbin lahko neželene učinke na lokalne ekosisteme. Ključne predpostavke in omejitve temeljijo na empiričnih ugotovitvah in teorijah drugih avtorjev, pri čemer se priznavajo metodološke omejitve in kompleksnost raziskovanja v naravnih habitatih divjih živali. Cilj je preučiti vpliv na različne vrste, učinkovitost ukrepov za omilitev in predlagati inovativne rešitve, pri čemer je poudarek na tehnološkem napredku, strategijah upravljanja habitata in priporočilih politike. Poudarek je tudi na pomembnosti meddisciplinarnega sodelovanja med ekologi, inženirji in ustvarjalci politike pri oblikovanju trajnostnih projektov vetrne energije. Sklepno, cilj diplomskega dela je povečati ozaveščenost javnosti o kompleksnem razmerju med energijo vetra in divjimi živalmi.
Keywords: vetrna energija, vetrne elektrarne, vpliv vetrne energije na okolje, vpliv vetrne energije na divje živali, vpliv vetrne energije na ptice
Published in DKUM: 11.02.2025; Views: 0; Downloads: 29
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