Article
Engineering, Civil
Undarmaa Tumenbayar, Kyungnam Ko, Jungchul Choi
Summary: An experimental investigation was conducted at the DBK wind farm on Jeju Island, South Korea to evaluate the usability of nacelle mounted light detection and ranging (lidar) for power performance testing in excavated terrain conditions. The influence of excavated terrain on power curves was found to be minimal.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2021)
Article
Green & Sustainable Science & Technology
Ingrid Neunaber, Michael Hoelling, Jonathan Whale, Joachim Peinke
Summary: An experimental wind tunnel study compared the turbulence in the wakes of a static actuator disc and a model wind turbine, finding that both models have similar properties in the far wake, with turbulence in the central wake being independent of the inflow conditions. Both models filter larger scale intermittency in the far wake, and the turbine generates its own turbulence with strong features of homogeneous, isotropic turbulence.
Article
Acoustics
Sinan Basaran, Fevzi Cakmak Bolat, Selim Sivrioglu
Summary: An active electromagnetic mass damper system was utilized to eliminate flow-induced vibrations in structural systems like wind turbines, with an adaptive backstepping control design predicting and suppressing wind load-induced vibrations. The proposed system successfully reduced system vibrations, making it suitable for flow-induced vibration damping in structural systems.
JOURNAL OF VIBRATION AND CONTROL
(2022)
Article
Green & Sustainable Science & Technology
Zhiteng Gao, Ye Li, Tongguang Wang, Wenzhong Shen, Xiaobo Zheng, Stefan Probsting, Deshun Li, Rennian Li
Summary: The study introduces a new anisotropic body-force projection model in the actuator line model for wind-turbine wakes, showing that it can predict wakes more accurately and investigate wake characteristics under various yaw conditions. The research demonstrates the significant impact of nacelle effects on wind-turbine wakes, especially during yaw conditions.
Article
Engineering, Electrical & Electronic
Stanislav Piriienko, Wenwei Victor Wang, Martin Neuburger, Duleepa J. Thrimawithana, Alexander Balakhontsev
Summary: This article proposes a novel yaw inductive power transfer system for small-scale wind turbines, aiming to mitigate their main disadvantages. The system utilizes low-voltage mosfets in multilevel boost-series resonant topology combined with zero-voltage switching techniques to maximize efficiency. The peak power transfer efficiency of the proposed solution reaches 92.5%, converting generator voltage from 60 V dc to grid compatible 400 V dc.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Engineering, Marine
Ning Li, Li Li, Yongqian Liu, Yulu Wu, Hang Meng, Jie Yan, Shuang Han
Summary: This study investigated the influence of the parameter C-4 epsilon on the wake simulation of wind farms. It was found that decreasing this parameter can reduce the range of turbulent kinetic energy (TKE) generation and increase the TKE near the rotor. The influence of the nearby wake on the wake recovery rate of the downstream turbine is lessened. As the interwind turbine spacing increases, the TKE influence area in the wake region of each downstream machine gradually reduces, and atmospheric turbulence plays a dominant role in wake recovery. Decreasing the parameter C-4 epsilon effectively promotes the inflow wind velocity and power output of downstream turbines.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Chihoon Hur, Carlos Ferreira, Gerard Schepers
Summary: This paper investigates the dynamic effects of yawed flow and evaluates the applicability of current dynamic inflow models in yawed conditions. The results reveal significant deficiencies in phase delay on the actuator disc.
Article
Thermodynamics
Pier Francesco Melani, Francesco Balduzzi, Giovanni Ferrara, Alessandro Bianchini
Summary: Current research has identified several shortcomings in the ALM method numerical model for Vertical-Axis Darrieus rotors, including force spreading within the domain, robust aerodynamic polars, and implementation of dynamic stall models.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Thermodynamics
Dongheon Shin, Kyungnam Ko
Summary: This study analyzes the wake effect of wind turbines using a nacelle LiDAR and finds that it decreases the energy production efficiency of downstream wind turbines, with its magnitude and intensity varying with distance.
Article
Green & Sustainable Science & Technology
Alireza Arabgolarcheh, Daniel Micallef, Abdolrahim Rezaeiha, Ernesto Benini
Summary: This paper investigates the wake interactions in offshore wind farms by studying the effect of the upstream turbine motion on the downstream wind turbine loads and performance. The results indicate the need for higher fidelity modelling approaches when studying floating wind turbine interactions.
Article
Green & Sustainable Science & Technology
Samuel Handsaker, Iheanyichukwu Ogbonna, Konstantin Volkov
Summary: Wind energy generation is primarily focused in rural areas or at sea, with little attention given to urban locations. However, there is potential for using wind turbines in urban environments, utilizing existing structures such as bridges. Computational Fluid Dynamics (CFD) modeling and actuator disc theory are used to estimate and simplify turbine performance.
Article
Green & Sustainable Science & Technology
Ming Huang, Carlos Ferreira, Andrea Sciacchitano, Fulvio Scarano
Summary: This study investigates wake recovery from planar porous actuators that simulate the effect of wind turbines, proposing an effective mixing diameter for scaling streamwise momentum recovery and validating this concept through wind tunnel experiments and numerical simulations.
Article
Energy & Fuels
Valentin Chabaud
Summary: A novel approach for rotor-integrated aerodynamic loads modeling has been suggested, which accurately models thrust and power coefficients, with potential extensions to dynamic flow and azimuthal load variations.
Article
Engineering, Mechanical
C. Muscari, R. Giordani, P. Schito
Summary: In this study, a Fluid-Structure Interaction (FSI) method based on the SOWFA+ OpenFAST framework is tested. The linear structural module of FAST is coupled with SOWFA's Actuator Line simulations to perform aeroelastic analysis of a wind tunnel scaled model (1:75) of the DTU 10 MW turbine. The objective is to quantitatively describe the influence of turbine stiffness on wake flow by varying model structural properties. The simulations are conducted under two different operating conditions (TSR = 7.5 and TSR = 5.5).
JOURNAL OF FLUIDS AND STRUCTURES
(2023)
Article
Thermodynamics
Gonzalo P. Navarro Diaz, A. Celeste Saulo, Alejandro D. Otero
Summary: In this study, CFD simulation and the complete wind rose of the site are used to estimate the capacity factor, a key magnitude for wind farm development. A novel methodology is introduced to reduce the computational cost of CFD simulation, and results show that considering both wakes and terrain effects can achieve values close to measurements. Increasing the number of simulated direction sectors does not significantly impact the results.
Article
Green & Sustainable Science & Technology
Cameron Bracken, Nathalie Voisin, Casey D. Burleyson, Allison M. Campbell, Z. Jason Hou, Daniel Broman
Summary: This study presents a methodology and dataset for examining compound wind and solar energy droughts, as well as the first standardized benchmark of energy droughts across the Continental United States (CONUS) for a 2020 infrastructure. The results show that compound wind and solar droughts have distinct spatial and temporal patterns across the CONUS, and the characteristics of energy droughts are regional. The study also finds that compound high load events occur more often during compound wind and solar droughts than expected.
Article
Green & Sustainable Science & Technology
Ning Zhang, Yanghao Yu, Jiawei Wu, Ershun Du, Shuming Zhang, Jinyu Xiao
Summary: This paper provides insights into the optimal configuration of CSP plants with different penetrations of wind power by proposing an unconstrained optimization model. The results suggest that large solar multiples and TES are preferred in order to maximize profit, especially when combined with high penetrations of wind and photovoltaic plants. Additionally, the study demonstrates the economy and feasibility of installing electric heaters (EH) in CSP plants, which show a linear correlation with the penetration of variable energy resources.
Article
Green & Sustainable Science & Technology
M. Szubel, K. Papis-Fraczek, S. Podlasek
Article
Green & Sustainable Science & Technology
J. Silva, J. C. Goncalves, C. Rocha, J. Vilaca, L. M. Madeira
Summary: This study investigated the methanation of CO2 in biogas and compared two different methanation reactors. The results showed that the cooled reactor without CO2 separation achieved a CO2 conversion rate of 91.8%, while the adiabatic reactors achieved conversion rates of 59.6% and 67.2%, resulting in an overall conversion rate of 93.0%. Economic analysis revealed negative net present worth values, indicating the need for government monetary incentives.
Article
Green & Sustainable Science & Technology
Yang Liu, Yonglan Xi, Xiaomei Ye, Yingpeng Zhang, Chengcheng Wang, Zhaoyan Jia, Chunhui Cao, Ting Han, Jing Du, Xiangping Kong, Zhongbing Chen
Summary: This study investigated the effect of using nanofiber membrane composites containing Prussian blue-like compound nanoparticles (PNPs) to relieve ammonia nitrogen inhibition of rural organic household waste during high-solid anaerobic digestion and increase methane production. The results showed that adding NMCs with 15% PNPs can lower the concentrations of volatile fatty acids and ammonia nitrogen, and increase methane yield.
Article
Green & Sustainable Science & Technology
Zhong Ge, Xiaodong Wang, Jian Li, Jian Xu, Jianbin Xie, Zhiyong Xie, Ruiqu Ma
Summary: This study evaluates the thermodynamic, exergy, and economic performance of a double-stage organic flash cycle (DOFC) using ten eco-friendly hydrofluoroolefins. The influences of key parameters on performance are analyzed, and the advantages of DOFC over single-stage type are quantified.
Article
Green & Sustainable Science & Technology
Nicolas Kirchner-Bossi, Fernando Porte-Agel
Summary: This study investigates the optimization of power density in wind farms and its sensitivity to the available area size. A novel genetic algorithm (PDGA) is introduced to optimize power density and turbine layout. The results show that the PDGA-driven solutions significantly reduce the levelized cost of energy (LCOE) compared to the default layout, and exhibit a convex relationship between area and LCOE or power density.
Article
Green & Sustainable Science & Technology
Chunxiao Zhang, Dongdong Li, Lin Wang, Qingpo Yang, Yutao Guo, Wei Zhang, Chao Shen, Jihong Pu
Summary: In this study, a novel reversible liquid-filled energy-saving window that effectively regulates indoor solar radiation heat gain is proposed. Experimental results show that this window can effectively reduce indoor temperature during both summer and winter seasons, while having minimal impact on indoor illuminance.
Article
Green & Sustainable Science & Technology
Alessandro L. Aguiar, Martinho Marta-Almeida, Mauro Cirano, Janini Pereira, Leticia Cotrim da Cunha
Summary: This study analyzed the Brazilian Equatorial Shelf using a high-resolution ocean model and found significant tidal variations in the area. Several hypothetical barrages were proposed with higher annual power generation than existing barrages. The study also evaluated the installation effort of these barrages.
Article
Green & Sustainable Science & Technology
Francesco Superchi, Nathan Giovannini, Antonis Moustakis, George Pechlivanoglou, Alessandro Bianchini
Summary: This study focuses on the optimization of a hybrid power station on the Tilos island in Greece, aiming to increase energy export and revenue by optimizing energy fluxes. Different scenarios are proposed to examine the impact of different agreements with the grid operator on the optimal solution.
Article
Green & Sustainable Science & Technology
Peimaneh Shirazi, Amirmohammad Behzadi, Pouria Ahmadi, Sasan Sadrizadeh
Summary: This research presents two novel energy production/storage/usage systems to reduce energy consumption and environmental effects in buildings. A biomass-fired model and a solar-driven system integrated with photovoltaic thermal (PVT) panels and a heat pump were designed and assessed. The results indicate that the solar-based system has an acceptable energy cost and the PVT-based system with a heat pump is environmentally superior. The biomass-fired system shows excellent efficiency.
Article
Green & Sustainable Science & Technology
Zihao Qi, Yingling Cai, Yunxiang Cui
Summary: This study aims to investigate the operational characteristics of the solar-ground source heat pump system (SGSHPS) in Shanghai under different operation modes. It concludes that tandem operation mode 1 is the optimal mode for winter operation in terms of energy efficiency.
Article
Green & Sustainable Science & Technology
L. Bartolucci, S. Cordiner, A. Di Carlo, A. Gallifuoco, P. Mele, V. Mulone
Summary: Spent coffee grounds are a valuable biogenic waste that can be used as a source of biofuels and valuable chemicals through pyrolysis and solvent extraction processes. The study found that heavy organic bio-oil derived from coffee grounds can be used as a carbon-rich biofuel, while solvent extraction can extract xantines and p-benzoquinone, which are important chemicals for various industries. The results highlight the promising potential of solvent extraction in improving the economic viability of coffee grounds pyrolysis-based biorefineries.
Article
Green & Sustainable Science & Technology
Luiza de Queiroz Correa, Diego Bagnis, Pedro Rabelo Melo Franco, Esly Ferreira da Costa Junior, Andrea Oliveira Souza da Costa
Summary: Building-integrated photovoltaics, especially organic solar technology, are important for reducing greenhouse gas emissions in the building sector. This study analyzed the performance of organic panels laminated in glass in a vertical installation in Latin America. Results showed that glass lamination and vertical orientation preserved the panels' performance and led to higher energy generation in winter.
Article
Green & Sustainable Science & Technology
Zhipei Hu, Shuo Jiang, Zhigao Sun, Jun Li
Summary: This study proposes innovative fin arrangements to enhance the thermal performance of latent heat storage units. Through optimization of fin distribution and prediction of transient melting behaviors, it is found that fin structures significantly influence heat transfer characteristics and melting behaviors.