TY - JOUR AU - Wang, W. AU - Guo, Y. AU - Yang, D. AU - Zhang, Z. AU - Kleissl, J. AU - van der Meer, D. AU - Yang, G. AU - Hong, T. AU - Liu, B. AU - Huang, N. AU - Mayer, Martin János TI - Economics of physics-based solar forecasting in power system day-ahead scheduling JF - RENEWABLE & SUSTAINABLE ENERGY REVIEWS J2 - RENEW SUST ENERG REV VL - 199 PY - 2024 PG - 14 SN - 1364-0321 DO - 10.1016/j.rser.2024.114448 UR - https://m2.mtmt.hu/api/publication/34832873 ID - 34832873 N1 - School of Electrical Engineering and Automation, Harbin Institute of Technology, Heilongjiang, Harbin, China College of New Energy, Harbin Institute of Technology (Weihai), Shandong, Weihai, China Center for Energy Research, Department of Mechanical and Aerospace Engineering, University of California, San Diego, CA, United States Mines Paris, PSL University, Centre for processes, renewable energy and energy systems (PERSEE), Sophia Antipolis, 06904, France Department of Systems Engineering and Engineering Management, University of North Carolina at Charlotte, Charlotte, NC, United States Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology, Northeast Electric Power University, Jilin, Jilin, China Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Műegyetem rkp. 3, Budapest, H-1111, Hungary Export Date: 3 May 2024 CODEN: RSERF Correspondence Address: Guo, Y.; School of Electrical Engineering and Automation, Heilongjiang, China; email: guoyufeng@hit.edu.cn AB - A high-quality solar power forecasting system that strictly adheres to grid regulations is valuable for system operators to formulate strategies for power system scheduling. Some grid operators, therefore, enact penalty schemes for the forecasts submitted by photovoltaic (PV) plant owners, as a means to fortify truthful and high-quality forecast submissions. From the perspectives of both plant owners and grid operators, this study inquires into the quality-to-value mapping of solar forecasts in the context of power system day-ahead scheduling. A physics-based solar power forecasting method is presented, which consists of two steps. Firstly, ensemble numerical weather prediction (NWP) is summarized into point forecasts. Then irradiance is converted to power via a physical model chain. The results reveal that the two-step physics-based forecasting method has an advantage over a winning method in Global Energy Forecasting Competition 2014 in terms of several accuracy measures. Subsequently, the economics of solar forecasting is quantified through performing day-ahead scheduling on a modified IEEE 30-bus system with PV and battery storage. It is demonstrated that, by respecting the statistical theory on consistency and elicitability when extracting point forecasts from NWP ensembles, both power system operators and PV plant owners can benefit profoundly in terms of cost savings. The former sees fewer needs for reserves, while the latter is less penalized. The data and Python code used to produce the results are also provided to enhance the reproducibility of this work. © 2024 Elsevier Ltd LA - English DB - MTMT ER - TY - GEN AU - Daniarta, Sindu AU - Kolasiński, P. AU - Imre, Attila AU - Sowa, D. TI - Artificial intelligence-driven performance mapping: a deep learning-based investigation of a two-phase expander in retrofitted organic Rankine cycle PY - 2024 UR - https://m2.mtmt.hu/api/publication/34832453 ID - 34832453 LA - English DB - MTMT ER - TY - JOUR AU - Daniarta, Sindu AU - Imre, Attila AU - Kolasiński, Piotr TI - Exploring performance map: theoretical analysis of subcritical and transcritical power cycles with wet and isentropic working fluids JF - ENERGY J2 - ENERGY VL - 299 PY - 2024 SP - 131450 SN - 0360-5442 DO - 10.1016/j.energy.2024.131450 UR - https://m2.mtmt.hu/api/publication/34832086 ID - 34832086 LA - English DB - MTMT ER - TY - JOUR AU - Al-Oran, O. AU - Shaban, N.A. AU - Manna, R. AU - Ayadi, O. AU - A’saf, A. AU - Lezsovits, Ferenc TI - Performance study of parabolic trough solar collector using hybrid nanofluids under Jordanian weather conditions JF - JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY J2 - J THERM ANAL CALORIM VL - 149 PY - 2024 SP - 3981 EP - 3998 PG - 18 SN - 1388-6150 DO - 10.1007/s10973-024-12961-8 UR - https://m2.mtmt.hu/api/publication/34822038 ID - 34822038 N1 - Renewable Energy Technology Department, Applied Science Private University, Amman, 11937, Jordan Mechanical Engineering Department, Al-Zaytoonah University of Jordan, Amman, 11733, Jordan Mechanical Engineering Department, The University of Jordan, Amman, 11942, Jordan Department of Energy Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Muegyetem Rkp.3., Budapest, 1111, Hungary Correspondence Address: Al-Oran, O.; Renewable Energy Technology Department, Jordan; email: o_alouran@asu.edu.jo AB - The aim of this experimental and modeling work is to compare the thermal efficiency of two identical parabolic trough solar collector systems under weather conditions in Amman, Jordan, using a hybrid nanofluid of MWCNTs and Y2O3 with gum Arabic surfactant, and distilled water as the heat transfer fluid (HTF). One parabolic trough collector (PTC) uses a hybrid nanofluid at four different volumetric concentrations (0.01, 0.025, 0.05, and 0.1%), while the other uses water as a HTF. To prepare the nanofluids and check their stability, the thermal efficiency of the PTC was examined for different hybrid nanofluid concentrations compared to distilled water. The results showed that the 0.1% MWCNTs and Y2O3 hybrid nanofluid had the highest thermal efficiency of 44.24%, while water had a thermal efficiency of 19.32%. In addition, increasing the concentrations resulted in an improvement in the maximum optical efficiency. The maximum efficiency of 45% was obtained using 0.1% Vol. The Solidworks model was created according to experimental setup parameters and dimensions. The simulation was conducted under steady-state operating conditions, incorporating dimensional governing equations (continuity, momentum, and energy). A uniform heat flux was applied with two primary boundary conditions: the first one was at the receiver inlet where the fluid inlet temperature and mass flow rate were specified, whereas the second one was at the receiver outlet, where the outlet pressure was equivalent to the atmospheric pressure. The obtained experimental results have been compared using the Solidwork simulation model, which was created to determine the PTC’s outlet temperature and thermal efficiency. The comparative results demonstrated remarkable precision with an average outlet temperature of 0.03% and thermal efficiency of 0.9%. © Akadémiai Kiadó, Budapest, Hungary 2024. LA - English DB - MTMT ER - TY - JOUR AU - Kardos, Réka AU - Rácz, Erika AU - Malý, M. AU - Jedelský, J. AU - Józsa, Viktor TI - Detailed spray analysis of airblast atomization of various fuels in a reacting environment JF - INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER J2 - INT J HEAT MASS TRANS VL - 227 PY - 2024 PG - 12 SN - 0017-9310 DO - 10.1016/j.ijheatmasstransfer.2024.125548 UR - https://m2.mtmt.hu/api/publication/34822026 ID - 34822026 N1 - Department of Energy Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Műegyetem rkp. 3., Budapest, H-1111, Hungary Faculty of Mechanical Engineering, Brno University of Technology, Technicka 2896/2, Brno, 616 69, Czech Republic Export Date: 26 April 2024 CODEN: IJHMA Correspondence Address: Kardos, R.A.; Department of Energy Engineering, Műegyetem rkp. 3., Hungary; email: kardos.reka9@gmail.com AB - Understanding spray evolution in a reacting environment is critical to designing advanced, clean combustion systems. The processes in the upstream region determine flame shape, stability, ignition characteristics, pollutant emission, and combustion efficiency. The developed spray is never achieved in combustion since the early regions feature primary and secondary atomization, while droplets evaporate as they approach the flame. Consequently, there is no thermodynamic equilibrium before the flame front. The principal goal of this paper is to provide detailed information to model developers on various sprays measured by a Phase Doppler Anemometer; the processed measurement data is available as supplementary material, while the raw data will be provided upon request. Four different fuels were tested: diesel fuel, aviation kerosene type JP-8, biodiesel, and a 50 % biodiesel-diesel blend by volume. The plain-jet airblast atomizer was tested at four atomization gauge pressures (0.3, 0.45, 0.6, 0.75 barg). Therefore, sixteen different sprays were measured along one spray diameter at each of four downstream distances of 15, 25, 35, and 45 mm, measured from the nozzle tip. The paper details the droplet size distribution, droplet axial velocity, fluctuations, and correlation between size and velocity to facilitate a comprehensive understanding of liquid fuel sprays. This latter measure helps identify the overshooting phenomenon, i.e., localizing the regions where the large droplets move faster than the gas phase. © 2024 The Author(s) LA - English DB - MTMT ER - TY - JOUR AU - Csemány, Dávid TI - Magas hőmérsékletű nátrium-kén akkumulátor koncentrált paraméterű modellezése JF - ENERGIAGAZDÁLKODÁS J2 - ENERGIAGAZDÁLKODÁS VL - 65 PY - 2024 IS - 1-2 SP - 18 EP - 23 PG - 6 SN - 0021-0757 UR - https://m2.mtmt.hu/api/publication/34816686 ID - 34816686 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Daniarta, Sindu AU - Kolasiński, Piotr AU - Imre, Attila TI - Performance map and theoretical analysis of Carnot battery technology via novel reversible Rankine-based cycle JF - ENERGY REPORTS J2 - ENERGY REP VL - 11 PY - 2024 SP - 4500 EP - 4514 PG - 15 SN - 2352-4847 DO - 10.1016/j.egyr.2024.04.024 UR - https://m2.mtmt.hu/api/publication/34816661 ID - 34816661 N1 - Export Date: 3 May 2024 Correspondence Address: Daniarta, S.; Department of Energy Engineering, Műegyetem rkp. 3, Hungary; email: daniarta@energia.bme.hu Funding details: Magyar Tudományos Akadémia, MTA Funding details: Narodowa Agencja Wymiany Akademickiej, NAWA Funding text 1: Part of the research reported in this paper and carried out at BME was funded by the Sustainable Development and Technologies National Programme of the Hungarian Academy of Sciences (FFT NP FTA). This work was supported by NAWA STER Program Internationalization of Wroc\\u0142aw University of Science and Technology Doctoral School. LA - English DB - MTMT ER - TY - JOUR AU - Gál, Márton AU - Samaniego Andrade, Samantha Kathiuska AU - Fehér, Anna Éva AU - Farkas, Attila AU - Madarász, János AU - Horváth, Lili AU - Gordon, Péter AU - Kovács, Róbert Sándor AU - Nagyné László, Krisztina TI - Thermal diffusity in copper benzene-1,3,5-tricarboxylate–reduced graphite oxide mechanical composites JF - JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY J2 - J THERM ANAL CALORIM PY - 2024 PG - 13 SN - 1388-6150 DO - 10.1007/s10973-024-13021-x UR - https://m2.mtmt.hu/api/publication/34772009 ID - 34772009 N1 - Export Date: 7 May 2024 CODEN: JTACF AB - Metal organic frameworks (MOFs) and particularly copper benzene-1,3,5-tricarboxylate (HKUST-1) are excellent materials for gas storage (e.g., CH 4 , N 2 , H 2 adsorption) and gas separation. In this work, reduced graphene oxide (RGO)–HKUST-1 mechanical mixtures were studied in order to reveal the effect of RGO content on the pressure tolerance of the texture and heat conductivity. HKUST-1 was obtained by two different synthesis routes. Air-dried MOF and RGO were thoroughly mixed prior to the compression. Powder XRD and Raman spectroscopy were used to characterize the response of the crystal structure, while low-temperature nitrogen adsorption was used the follow the adsorption properties of the pellets. Finally, the "flash" heat pulse method was used to assess the thermal properties. The gas adsorption isotherms revealed that the adsorption capacity decreases when RGO is added. Based on Raman and XRD results, we found that the synthesis route has an effect on multiple scales. We experimentally confirmed that evaluation of the thermal diffusivity requires a model more complex than the simple Fourier equation, due to the inherent heterogeneous structure of the material. A good approximation of the Fourier coefficient of thermal diffusivity was obtained using the parameters of the Guyer–Krumhansl equation. The heat pulse experiments also revealed possible size-dependent behavior. LA - English DB - MTMT ER - TY - JOUR AU - Tóth, Balázs AU - Molnár, Zsombor AU - Kovács, Róbert Sándor TI - Two-field mixed hp-finite elements for time-dependent problems in the refined theories of thermodynamics JF - CONTINUUM MECHANICS AND THERMODYNAMICS J2 - CONTINUUM MECH THERM PY - 2024 PG - 14 SN - 0935-1175 DO - 10.1007/s00161-024-01300-9 UR - https://m2.mtmt.hu/api/publication/34757577 ID - 34757577 N1 - Export Date: 7 May 2024 AB - Modern manufacturing technologies allow heterogeneous materials with complex inner structures (e.g., foams) to be easily produced. However, their utilization is not straightforward, as the classical constitutive laws are not necessarily valid. According to various experimental observations, the Guyer–Krumhansl equation is a promising candidate for modeling such complex structures. However, practical applications need a reliable and efficient algorithm capable of handling both complex geometries and advanced heat equations. In the present paper, we derive new two-field variational formulations which treat the temperature and the heat flux as independent field variables, and we develop new, advanced hp -type mixed finite element methods, which can be reliably applied. We investigate their convergence properties for various situations, challenging in relation to stability and the treatment of fast propagation speeds. That algorithm is also proved to be outstandingly efficient, providing solutions four magnitudes faster than commercial algorithms. LA - English DB - MTMT ER - TY - JOUR AU - Fehér, Anna Éva AU - Maróti, János Endre AU - Takács, Donát M. AU - Orbulov, Imre Norbert AU - Kovács, Róbert Sándor TI - Thermal and mechanical properties of AlSi7Mg matrix syntactic foams reinforced by Al2O3 or SiC particles in matrix JF - INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER J2 - INT J HEAT MASS TRANS VL - 226 PY - 2024 PG - 12 SN - 0017-9310 DO - 10.1016/j.ijheatmasstransfer.2024.125446 UR - https://m2.mtmt.hu/api/publication/34755651 ID - 34755651 N1 - Export Date: 7 May 2024 CODEN: IJHMA LA - English DB - MTMT ER -