TY - JOUR AU - Atsu, Divine Kafui AU - Seres, István AU - Farkas, István TI - Power quality assessment and compliance of grid-connected PV systems in low voltage networks using microinverters JF - ENERGY SYSTEMS: OPTIMIZATION MODELING SIMULATION AND ECONOMIC ASPECTS J2 - ENERGY SYSTEMS PY - 2024 SN - 1868-3967 DO - 10.1007/s12667-024-00665-9 UR - https://m2.mtmt.hu/api/publication/34799793 ID - 34799793 AB - Solar PV has experienced unprecedented growth in the last decade, with the most significant additions being utility-scale solar PV. The role of grid inverters is very critical in feeding power from distributed sources into the grid. With the increasing growth of grid-tied solar PV systems (both rooftop and large-scale), the awareness of power quality issues has risen with new regulations and standards to ensure the stability of the power grid. The power quality of microinverters has been investigated under steady solar irradiation and PV power source and also under real outdoor conditions in compliance with the accepted solar PV integration requirements. The current total harmonic distortion (THD) measured for the studied microinverter under outdoor conditions far exceeded the current THD for the study under steady indoor conditions and was beyond the accepted standard. However, the voltage THD outputs for the two studied cases were in good agreement with the grid codes. The voltage and current THD for the 400 Wm −2 (60 Wp) and the 1000 Wm −2 (146 Wp) scenarios under the steady solar irradiation (solar PV power) were 2.24%, 13%, and 2.27, 6.93%, respectively. The voltage and current THDs for the outdoor study were 2.03% and 14.28% for Solarex (pc-Si module), 1.94%, and 27.43% for Juta (mc-Si modules), and 1.97% and 33.6% for Dunasolar (a-Si glass module). Results showed a strong correlation between the intermittence of solar radiation and the current THD. 67%, 54%, and 37% of the recorded power factor for Dunasolar, Juta, and Solarex modules, respectively, exceeded the limits prescribed by the standards. LA - English DB - MTMT ER - TY - JOUR AU - Páger, Szabolcs AU - Géczi, Gábor AU - Földi, László TI - A szakaszos fűtési üzem hatása az energiamegtakarításra különböző időszakban épült családi házak esetén JF - MAGYAR ÉPÜLETGÉPÉSZET J2 - MAGYAR ÉPÜLETGÉPÉSZET VL - 73 PY - 2024 IS - 3 SP - 9 EP - 17 PG - 9 SN - 1215-9913 UR - https://m2.mtmt.hu/api/publication/34787578 ID - 34787578 AB - Mai világunkban az épített környezet tervezése és üzemeltetése terén a fenntarthatóság és energiahatékonyság jelentős kihívásokat jelentenek. Az energia megtakarítása kiemelkedő szerepet játszik az épület határoló szerkezeteinek tervezésében, elsősorban az energia költségeinek emelkedése miatt. A modellezés és szimuláció új lehetőségeket kínálnak hatékonyabb rendszerek kifejlesztésére az energiafogyasztás csökkentése és az optimális hőmérséklet fenntartása érdekében. Kutatásunk szimulációs eredményekre alapozott következtetéseket von le az épülethatároló szerkezetekre vonatkozóan, amelyek megfelelnek az adott időszakban érvényben lévő követelményeknek. Emellett összehasonlítjuk az állandó és szakaszos üzemű fűtési módokat annak érdekében, hogy megvizsgáljuk megtakarítási potenciáljukat. Validált modellek segítségével szimuláltuk az épületek fűtési energiaigényét, figyelembe véve különböző időszakokra jellemző határoló szerkezeteket. Hat különböző követelményszint szerint futtattuk le a szimulációkat különböző hőmérsékleti feltételek mellett. A kutatás eredményeinek bemutatásához diagramokat és táblázatokat használtunk, hogy szemléltessük az épület határoló szerkezeteinek hőátbocsátási tényezői és a számított fűtési energiaigény közötti összefüggést. Kiemeltük az állandó és szakaszos fűtési üzem közötti különbségeket, hangsúlyozva megtakarítási potenciáljukat. LA - Hungarian DB - MTMT ER - TY - JOUR AU - Alshibil, Ahssan AU - Víg, Piroska AU - Farkas, István TI - Thermal equilibrium time as a novel characteristic of nanofluid evaluation: An experimental investigation of distilled water-based binary and ternary nanofluids JF - JOURNAL OF MOLECULAR LIQUIDS J2 - J MOL LIQ VL - 400 PY - 2024 SN - 0167-7322 DO - 10.1016/j.molliq.2024.124567 UR - https://m2.mtmt.hu/api/publication/34777460 ID - 34777460 LA - English DB - MTMT ER - TY - JOUR AU - Al-Rabeeah, Asaad Yasseen AU - Seres, István AU - Farkas, István TI - Experimental and numerical investigation of parabolic trough solar collector thermal efficiency enhanced by graphene–Fe3O4/water hybrid nanofluid JF - RESULTS IN ENGINEERING J2 - RESULT ENGIN VL - 21 PY - 2024 SP - 1 EP - 13 PG - 13 SN - 2590-1230 DO - 10.1016/j.rineng.2024.101887 UR - https://m2.mtmt.hu/api/publication/34734709 ID - 34734709 LA - English DB - MTMT ER - TY - JOUR AU - Khele, Issam AU - Szabó, Márta TI - A review of the effect of semi-transparent building-integrated photovoltaics on the visual comfort indoors JF - DEVELOPMENTS IN THE BUILT ENVIRONMENT J2 - DEV BUILT ENVIRON VL - 17 PY - 2024 SN - 2666-1659 DO - 10.1016/j.dibe.2024.100369 UR - https://m2.mtmt.hu/api/publication/34627771 ID - 34627771 LA - English DB - MTMT ER - TY - JOUR AU - Permana, Diki Ismail AU - Rusirawan, Dani AU - Farkas, István TI - Utilization of Small Solar-ORC Integrated with Organic PCMs in Hungary Condition JF - E3S WEB OF CONFERENCES J2 - E3S WEB CONF VL - 484 PY - 2024 SP - 1 EP - 10 PG - 10 SN - 2555-0403 DO - 10.1051/e3sconf/202448403014 UR - https://m2.mtmt.hu/api/publication/34573719 ID - 34573719 AB - Regarding solar energy resource potential, Hungary has a daily total of around 3.2 to 3.6 kWh/m2 and an annual total of approximately 1168 to 1314 kWh/m2. It makes it a good position for solar thermal collectors in combination with an ORC system. In this study, the authors investigated solar thermal as a heat source to generate electricity, with ORC utilizing R245fa as a working fluid. Due to the limited time for utilizing solar thermal by ORC, while the highest electricity usage is at night, heat storage is carried out by integrating a TES-evaporator using organic PCM. LA - English DB - MTMT ER - TY - JOUR AU - Anggraeni, Nuha Desi AU - Seres, István AU - Farkas, István TI - Energetic analysis of semi-transparent photovoltaic module JF - E3S WEB OF CONFERENCES J2 - E3S WEB CONF VL - 484 PY - 2024 SP - 1 EP - 12 PG - 12 SN - 2555-0403 DO - 10.1051/e3sconf/202448403001 UR - https://m2.mtmt.hu/api/publication/34572491 ID - 34572491 AB - Alternatives to traditional fossil-based energy generation are required to combat climate change and air pollution. Solar power has become increasingly appealing due to its infinite supply, ability to mitigate climate change, and non-polluting nature. The semi-transparent photovoltaics have a portion of the cell that allows light to pass through while the rest of the cell generates electricity. Energy analysis on semi-transparent photovoltaic is needed to determine their performance. The studied semi-transparent photovoltaic systems consist of ten modules combined in one panel and two separate panels. The system consists of 2x10 pieces 165 Wp Solarwatt Vision modules with 3,3 kWp capacity. The installation site’s location is the latitude 47.5946° N, 19.3619° E. The energy production of semi-transparent photovoltaics: The highest energy production per year was found in 2018 with a value of 3.18 MWh, followed by 2019, 2021, 2020, and 2017 with values of 2.76 MWh, 2.5 MWh, 2.31 MWh, and 1.68 MWh, respectively. The highest monthly energy production is found in April, May, June, and July, with values of 445618 Wh, 459812 Wh, 442955 Wh, and 496671 Wh, respectively. The further plan is to study PAR components under the modules. LA - English DB - MTMT ER - TY - JOUR AU - Rusirawan, Dani AU - Hartawan, Liman AU - Lidyawati, Lita AU - Bozikova, Monika AU - Hlavacova, Zuzana AU - Libra, Martin AU - Seres, István AU - Víg, Piroska AU - Farkas, István TI - Research Collaboration of ITENAS Bandung – Indonesia and MATE Godollo – Hungary on the Photovoltaic Thematic Field: Achievements and Future Plan JF - E3S WEB OF CONFERENCES J2 - E3S WEB CONF VL - 484 PY - 2024 SP - 1 EP - 8 PG - 8 SN - 2555-0403 DO - 10.1051/e3sconf/202448403011 UR - https://m2.mtmt.hu/api/publication/34568219 ID - 34568219 AB - Since the agreement was signed officially in 2013, Institut Teknologi Nasional Bandung (ITENAS Bandung) – Indonesia and Hungarian University of Agriculture and Life Sciences (MATE Godollo) – Hungary have implemented a lot of scholarly activities, and one of them is research collaboration in the field of solar energy, especially in the thematic field of photovoltaic (PV). A set of experimental facilities has been developed and constructed to support related research. Basic facilities to understand the principle of electricity generated by PV, i.e., having the solar power plant (SPP) laboratory scale have been fulfilled by both universities. MATE Godollo has a 10 kWp SPP installation and uses polycrystalline and amorphous silicon PV modules, meanwhile, ITENAS Bandung has 1 kWp SPP and uses monocrystalline silicon PV modules. In this paper, a set of activities related to PV research collaboration between ITENAS Bandung and MATE Godollo will be elaborated, including the output and the outcome of the activities, and plan activities involving other university partners, Slovak University of Agriculture in Nitra – Slovakia and Czech University of Life Science Prague, Czech Republic. LA - English DB - MTMT ER - TY - JOUR AU - Almadhhachi, Mensour AU - Seres, István AU - Farkas, István TI - Sunflower solar tree vs. flat PV module: A comprehensive analysis of performance, efficiency, and land savings in urban solar integration JF - RESULTS IN ENGINEERING J2 - RESULT ENGIN VL - 21 PY - 2024 SP - 1 EP - 11 PG - 11 SN - 2590-1230 DO - 10.1016/j.rineng.2023.101742 UR - https://m2.mtmt.hu/api/publication/34515728 ID - 34515728 N1 - Doctoral School of Mechanical Engineering, Hungarian University of Agriculture and Life Sciences, Páter K. u. 1, Gödöllő, H-2100, Hungary Institute of Mathematics and Basic Science, Hungarian University of Agricultural and Life Sciences, Páter K. u. 1, Gödöllő, H-2100, Hungary Institute of Technology, Hungarian University of Agricultural and Life Sciences, Páter K. u. 1, Gödöllő, H-2100, Hungary Department of Mechanical Engineering, Faculty of Engineering, University of Kufa, Najaf, 54001, Iraq Export Date: 25 January 2024 Correspondence Address: Almadhhachi, M.; Doctoral School of Mechanical Engineering, Páter K. u. 1, Hungary; email: Al-Madhhachi.Mensour.Saheb.Malek@phd.uni-mate.hu AB - Solar energy, a prominent form of renewable energy, can be efficiently harnessed through photovoltaic (PV) technology, which has witnessed significant advancements over the past two decades. Solar tree technology has emerged as a solution to several technical challenges associated with PV systems, including land footprint concerns, aesthetic integration, and efficiency optimization. This experimental study compares a traditional flat PV module and a solar tree modeled after a sunflower. The comparative framework encompasses assessments across three distinct tilt angles to evaluate the impact of inclination on energy output. Empirical findings reveal that the sunflower-shaped module can generate 16–23 % more energy than its flat counterpart. Furthermore, temperature assessments indicate that the flat PV module reached a peak temperature of 51 °C, in contrast to the sunflower's maximum of 41 °C. An examination of the ground footprint revealed that the sunflower PV module afforded 85 % land savings relative to the flat PV module. Additionally, the research noted an average temperature reduction of 3 °C in areas shaded by solar trees, offering potential benefits for agricultural applications. © 2024 The Authors LA - English DB - MTMT ER - TY - JOUR AU - Machi, Maytham Hasan Mahdi AU - Farkas, István AU - Buzás, János TI - Enhancing solar air collector performance through optimized entrance flue design: A comparative study JF - INTERNATIONAL JOURNAL OF THERMOFLUIDS J2 - INT J THERMOFLUIDS VL - 21 PY - 2024 SP - 1 EP - 13 PG - 13 SN - 2666-2027 DO - 10.1016/j.ijft.2024.100561 UR - https://m2.mtmt.hu/api/publication/34515560 ID - 34515560 LA - English DB - MTMT ER -