1. Analiza vpliva temperature na električne lastnosti sončnih modulov : diplomsko deloLeon Kosem, 2025, undergraduate thesis Abstract: Zaključno delo obravnava analizo električnih lastnosti štirih različnih sončnih modulov pri različnih temperaturah in obsevalnih pogojih. Meritve sončnih modulov so izvedene v skladu s standardom IEC 60891. Na osnovi meritev so med drugim določeni tudi temperaturni koeficienti toka kratkega stika, napetosti odprtih sponk in vršne moči, kar omogoča oceno vpliva temperature na učinkovitost sončnih modulov. Pridobljeni rezultati prispevajo k boljšemu razumevanju temperaturnih vplivov in optimalne izbire sončnih modulov glede na klimatske razmere, kar je ključno za izboljšanje njihove dolgoročne učinkovitosti in zanesljivosti. Uporabljene so eksperimentalne in analitične metode, pri čemer so bili rezultati meritev obdelani s statističnimi orodji za zagotovitev njihove natančnosti. Rezultati študije lahko služijo kot osnova za pravilno izbiro fotonapetostnih sistemov in izboljšanje njihovih zmogljivosti v različnih vremenskih pogojih.
Keywords: sončni modul, temperaturni vpliv, električne lastnosti, standardni testni pogoji
Published in DKUM: 19.06.2025; Views: 0; Downloads: 50
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2. Načrtovanje sistema centralnega ogrevanja hiše : diplomsko deloZoran Popović, 2023, undergraduate thesis Abstract: Učinkovita raba energije je izjemno pomembna za zmanjševanje energetskih potreb v stavbah in ključna v boju proti podnebnim spremembam, pri trajnostnem razvoju ter prehodu v nizkoogljično družbo. V diplomski nalogi so predstavljene različne vrste sistemov centralnega ogrevanja, opisane so njihove značilnosti ter osnovne komponente. Praktični del diplomske naloge zajema zasnovo sodobne stanovanjske hiše in načrtovanje energetsko učinkovitega sistema centralnega ogrevanja z lesno biomaso. V praktičnem delu naloge je vsebina osredotočena na analizo energetske učinkovitosti, določitev potrebne toplote za ogrevanje ter izračun projektne toplotne moči s pomočjo programskih orodij KI Energija in Audytor 7.0 PRO. Pridobljeni rezultati izvedenih analiz bodo ključni za sam postopek načrtovanja sistema centralnega ogrevanja. Usklajenost teoretičnih konceptov in praktičnega izvajanja omogoča celovit vpogled v proces načrtovanja ter obravnavo ekonomskih in energetskih vidikov sistema centralnega ogrevanja.
Keywords: energetska učinkovitost, sistemi centralnega ogrevanja, načrtovanje, KI Energija, Audytor HL
Published in DKUM: 18.01.2024; Views: 346; Downloads: 97
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5. Accuracy of Rotational Speed and Torque Sensors for Determining the Mechanical Power of Rotating Electrical MachinesGregor Srpčič, Iztok Brinovar, Bojan Štumberger, Sebastijan Seme, Miralem Hadžiselimović, 2019, published scientific conference contribution Abstract: This paper deals with determining the accuracy of measuring systems for determining the characteristics of rotating electrical machines. Efficiency classes and experimental methods for determining efficiency, are given in a standard, which has to be strictly respected. For determining the efficiency of an electrical machine, it is necessary to have a modern and accurate measurement system with sensors of high accuracy classes, which enables the user to carry out precise measurements and consequently, to determine all the characteristics of the electrical machine. This paper will be focused on torque and speed measurements.
Keywords: efficiency, measuring system, electric machines, torque and rotational sensors, accuracy
Published in DKUM: 04.12.2023; Views: 529; Downloads: 54
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6. Energy Efficiency Indicators of a Single Unit HouseIztok Brinovar, Gregor Srpčič, Zdravko Praunseis, Sebastijan Seme, Bojan Štumberger, Miralem Hadžiselimović, 2019, published scientific conference contribution Abstract: This article deals with the evaluation of energy efficiency indicators of an older single unit house with the use of "KI energija 2017" software, which is widely used among qualified Slovenian experts authorized to carry out the energy performance assessments and issue an energy performance certificate. The energy performance analysis before and after the implementation of proposed measures has shown significant energy saving potential in renovation of existing buildings.
Keywords: energy efficiency, energy indicators, energy performance, building renovation, CO2 emissions
Published in DKUM: 04.12.2023; Views: 488; Downloads: 65
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7. Estimation of the Solar Irradiance on Tilted Surface for Different Types of PyranometersSebastijan Seme, Klemen Sredenšek, Iztok Brinovar, Gregor Srpčič, Miralem Hadžiselimović, Bojan Štumberger, 2019, published scientific conference contribution Abstract: Accurate measurements of solar irradiance are important in many applications such as studying the distribution of received radiation or estimating the final yield of photovoltaic systems This paper deals with evaluation of different types of pyranometers. The primary objective of this paper is to compare two types of pyranometers, with the use of mathematical model for predicting solar radiation on incline surface. The mathematical model shows that both types of pyranometers receives the highest annual average solar radiation with a surface facing 189° south and inclination angle of 44°. The results in this paper show that the deviation between silicon photodiode and thermopile pyranometer mostly occur, due to irregular calibration, frequent cleaning and errors of silicon photodiode pyranometer under overcast sky conditions.
Keywords: pyranometer, solar radiation, azimuth angle, inclination angle, accuracy
Published in DKUM: 04.12.2023; Views: 392; Downloads: 54
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8. Measurement System for Testing of Electric Drives in Electric VehiclesIztok Brinovar, Gregor Srpčič, Sebastijan Seme, Bojan Štumberger, Miralem Hadžiselimović, 2019, published scientific conference contribution Abstract: This paper deals with the implementation of a measurement system, capable of performing real-time data acquisition and control, and allows the performance analysis of electric drives used for electric vehicle propulsion. For applying the mechanical load on the shaft of the tested motor three different test bench configurations with different power and speed ranges can be used. The main objective of the measurement system is to perform routine performance tests and road simulation tests (in terms of driving cycles) of an electric drive. It provides a research environment for analysis, investigation and study of electric drives and control strategies.
Keywords: measurement system, test bench, electric machines, electric vehicles, permanent magnet synchronous motor
Published in DKUM: 04.12.2023; Views: 383; Downloads: 56
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9. SWOT Analysis of Pedelecs and E-Cars in Selected Countries of the Danube RegionGregor Srpčič, Iztok Brinovar, Katja Hanžič, Miralem Hadžiselimović, Sebastijan Seme, 2019, published scientific conference contribution Abstract: This paper deals with pedelecs and e-cars in urban transport systems in selected countries of the Danube region. Within the EU project eGUTS a feasibility study focused on pedelecs and e-cars was made. Country specific information on e-mobility (pedelecs and ecars) was gathered and is briefly presented in chapter 2. In addition, a common SWOT analysis for all selected countries of the Danube region was made and is presented in the conclusion of the paper.
Keywords: pedelecs, e-cars, electric vehicles, SWOT analysis, Danube region
Published in DKUM: 04.12.2023; Views: 416; Downloads: 43
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10. Quality assessment of single-pass corner steel welded jointsZdravko Praunseis, Bojan Stergar, Iztok Brinovar, 2021, original scientific article Abstract: The aim of this paper is to analyse the quality assessment of single-pass corner steel welded joints. The testing revealed the most burdened welded joints, which were cut out of the workpiece and prepared for metallographic macroscopic and microscopic analysis. Thus, for all examinations of single-pass corner steel welded joints, the standard test procedures were used to determine the weldability and quality assessment of base materials and welded joints. Additionally, the effects of various welded defects of single-pass weld material on the bearing strength of corner welded joints will be analysed.
Keywords: welded joints, microstructure, cracks, undercut, main frame
Published in DKUM: 13.11.2023; Views: 399; Downloads: 46
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