TY - CHAP AU - Ahmed, Ahmed Elawad Eltayeb AU - Pillinger, György AU - Kiss, Péter ED - Bakacsi, Zsófia ED - Horel, Ágota ED - Mészáros, János ED - Rékási, Márk ED - Takács, Tünde Mária TI - Investigating the spectral behaviour and load bearing of soil T2 - Alternatives to Reduce Soil Degradation (ARSD2024) - Book of abstracts PB - HUN-REN Centre for Agricultural Research CY - Budapest SN - 9786155387128 PY - 2024 SP - 35 EP - 35 PG - 1 UR - https://m2.mtmt.hu/api/publication/34872425 ID - 34872425 LA - English DB - MTMT ER - TY - JOUR AU - Horváth, János AU - Kátai, László AU - Szabó, István AU - Korzenszky, Péter Emőd TI - An Electrical Conductivity Sensor for the Selective Determination of Soil Salinity JF - SENSORS J2 - SENSORS-BASEL VL - 24 PY - 2024 IS - 11 SP - 3296 SN - 1424-8220 DO - 10.3390/s24113296 UR - https://m2.mtmt.hu/api/publication/34870423 ID - 34870423 AB - The measurement of electrical conductivity (EC) has long been a tool for understanding soil properties. Previous studies concluded that EC measurement is not an ion-selective method, but these papers did not address the measurement frequency. An experimental tool and method were developed for semi-factory conditions in a large-scale soil trough at the Institute of Technology of the Hungarian University of Agricultural and Life Sciences. A specially designed and built test apparatus mounted on the tractor’s three-point hitch was used as a measuring device. The wear-resistant steel elements of the measuring device were also the sensors for measuring EC. This paper describes the conditions of the measurement series, the measurement results, and our conclusions from the experiments with the soil sensor. Different characteristics were measured in soil moistened with K and Ca solutions at different concentrations. The EC values show an increasing tendency with increasing salt concentration, and we also found that the rate of change of EC is different for different solution ratios. Based on our measurements, we found that the best method to isolate concentration differences is to use the test frequency range 20 Hz–250 kHz. LA - English DB - MTMT ER - TY - CHAP AU - El Hariri, Alaa AU - Kiss, Péter ED - Bakacsi, Zsófia ED - Horel, Ágota ED - Mészáros, János ED - Rékási, Márk ED - Takács, Tünde Mária TI - Determination of soil shear strength by remote sensing T2 - Alternatives to Reduce Soil Degradation (ARSD2024) - Book of abstracts PB - HUN-REN Centre for Agricultural Research CY - Budapest SN - 9786155387128 PY - 2024 SP - 34 EP - 34 PG - 1 UR - https://m2.mtmt.hu/api/publication/34846799 ID - 34846799 LA - English DB - MTMT ER - 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 -