Article
Green & Sustainable Science & Technology
Natraj, B. N. Rao, K. S. Reddy
Summary: Solar energy, an emerging technology, is increasingly utilizing concentrating power technology in solar power plants, with the structural stability of parabolic trough collectors being crucial in maintaining optical and thermal efficiencies under wind loads. The study highlights the impact of wind loads on slope deviations and the importance of yaw and pitch angles in collector design, as well as the differences in performance between collectors made of different materials.
Article
Green & Sustainable Science & Technology
Anish Malan, K. Ravi Kumar
Summary: This study investigates the impact of wind load on the stability of a large aperture parabolic trough solar collector (PTSC) and provides analysis and estimation. The findings contribute to optimizing the structural design and operational stability of solar thermal power plants.
Article
Multidisciplinary Sciences
Wisam Abed Kattea Al-Maliki, Sajda S. Alsaedi, Hayder Q. A. Khafaji, Falah Alobaid, Bernd Epple
Summary: The validated dynamic model of a parabolic trough power plant (PTPP) is improved by introducing a new feedwater circuit and a reference feedwater circuit, as well as developing the steam turbine model. The purpose is to increase the power output during the day and extend the night operating hours at a lower cost. This improvement reduces the reliance on fossil fuel backup system and lowers the specific energy cost of the PTPP.
SCIENTIFIC REPORTS
(2023)
Article
Energy & Fuels
Moucun Yang, Liming Zhi, Huan Liu, Yuezhao Zhu, Robert A. Taylor
Summary: This study develops similarity equations for estimating wind loads on large-scale parabolic trough collectors (PTCs) using validated numerical simulations. Practical similarity equations are proposed to bypass costly numerical simulation and wind tunnel testing for wind load estimation.
JOURNAL OF SOLAR ENERGY ENGINEERING-TRANSACTIONS OF THE ASME
(2023)
Article
Green & Sustainable Science & Technology
Anass Zaaoumi, Abdellah Bah, Mihaela Ciocan, Patrick Sebastian, Mugur C. Balan, Abdellah Mechaqrane, Mohammed Alaoui
Summary: In this study, three models were used to estimate the hourly electric production of a parabolic trough solar thermal power plant in Eastern Morocco. The results show that the artificial neural networks (ANN) model performs better than the analytical models, accurately estimating the energy production.
Article
Energy & Fuels
Wisam Abed Kattea Al-Maliki, Auday Shaker Hadi, Hussein M. H. Al-Khafaji, Falah Alobaid, Bernd Epple
Summary: Several improvements have been made to the referenced parabolic trough power plant (PTPP) model, resulting in increased electricity production, extended operating hours, and reduced dependence on fossil fuels. The optimizations include increasing the collector loops, improving the thermal storage system, and replacing the feedwater circuit with a feedwater/HTF circuit.
Article
Energy & Fuels
Georgios E. Arnaoutakis, Dimitris Al. Katsaprakakis, Dimitris G. Christakis
Summary: This paper investigates the potential of two concentrating solar power technologies, central power towers and parabolic trough collectors, in the same plant configuration through dynamic modeling. The results show that the configuration of a power tower and parabolic trough collectors has a more stable power profile and higher capacity factor compared to standalone plants based on a single technology.
Article
Green & Sustainable Science & Technology
Qiliang Wang, Gang Pei, Hongxing Yang
Summary: The novel parabolic trough solar receiver with a radiation shield, based on the theory of the negative thermal-flux region, shows great potential for significant enhancement of the techno-economic performance of solar power plants, improving electrical energy production and reducing the levelized cost of energy.
Article
Green & Sustainable Science & Technology
M. Medhat El-Bakry, Mahmoud A. Kassem, Muhammed A. Hassan
Summary: Boosting the optical and thermal efficiencies of parabolic trough concentrators is gaining global interest. This study proposes a new design with floating radiation heat shields to enhance energy and exergy efficiencies. The configuration with a diameter of 75 mm and a shading angle of 150 degrees showed the highest improvement ratios.
Article
Green & Sustainable Science & Technology
Ivan P. Acosta-Pazmino, C. Rivera-Solorio, M. Gijon-Rivera
Summary: This study evaluated the technical and economic performance of a solar thermal/photovoltaic hybrid system using parabolic trough solar collectors for a dairy plant in Mexico. The results showed that the hybrid system achieved higher thermal and electrical outputs in summer compared to a standalone solar thermal system.
Article
Green & Sustainable Science & Technology
Mohsen Yazdi, Mohammad Hasan Khoshgoftar Manesh
Summary: This study investigates the generation of electricity through solar Rankine cycle thermal power plants using direct steam-generating collectors. A two-tank indirect heat storage system is employed to ensure continuous power generation even when there is no solar energy. The results of various analyses conducted on the power generation cycle components are reported.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Energy & Fuels
Qiliang Wang, Yao Yao, Zhicheng Shen, Hongxing Yang
Summary: A novel parabolic trough collector-photovoltaic (PTC-PV) system is proposed to enhance the thermal performance and solar utilization efficiency. Mathematical models are established and experiments are conducted to validate the superior performance of the hybrid PTC-PV system.
Article
Thermodynamics
P. Ferrer, Khaled Mohamad, M. C. Cyulinyana, Victor Kaluba
Summary: In this article, design approaches to a receiver enclosed in an opaque cavity and heated by a solar parabolic trough collector are discussed. The optimization of the interaction between the cavity receiver and the solar radiation from a collector mirror is explored, which differs from conventional receivers and is essential for utilizing the benefits of using a cavity sleeve. Through simulations, different focal plane positions and the relative sizes of the receiver elements are investigated, and a focal plane close to the surface of the absorber pipe is found to have the highest efficiency at 62%. An experimental cavity receiver and parabolic trough system are then built based on the simulations, and the simulation results are validated against measured data with a maximum discrepancy of 8%. A novel method using the cooling behavior of the receiver is also applied to confirm the physical parameters through simulations.
APPLIED THERMAL ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Sara Ruiz-Moreno, Jose Ramon D. Frejo, Eduardo F. Camacho
Summary: Using artificial neural networks to approximate the optimal flow rate given by an MPC controller significantly reduces the computational load to 3% of the MPC computation time. The neural network controllers provide practically the same mean power as the MPC controller with less abrupt changes at the output and slight violations of the constraints.
Article
Thermodynamics
M. Arun, Debabrata Barik, K. P. Sridhar
Summary: This research analyzed the performance of a parabolic trough solar collector with a dimple tube and TiO2/DI-H2O nanofluid using computational fluid dynamics. The results showed that using nanofluids can significantly enhance the efficiency and convective heat transfer coefficient of the solar collector.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Engineering, Civil
S. Pezzotti, V Nadal Mora, A. Sanz Andres, S. Franchini
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2020)
Article
Engineering, Civil
Elena Lopez-Nunez, Mikel Ogueta-Gutierrez, Raul Manzanares-Bercial, Omar Gomez-Ortega, Sebastian Franchini, Elena Roibas-Millan, Angel Sanz-Andres
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2020)
Article
Engineering, Mechanical
Alvaro Ramos-Cenzano, Elena Lopez-Nunez, Daniel Alfonso-Corcuera, Mikel Ogueta-Gutierrez, Santiago Pindado
Summary: An experimental wind tunnel test was conducted to assess the possibility of using cup anemometers at high altitude (around 20 km), revealing that anemometers with larger cup radius rotors exhibit more stable behavior and can operate effectively up to 25 km above ground level.
FLOW MEASUREMENT AND INSTRUMENTATION
(2021)
Article
Engineering, Civil
A. Cuerva-Tejero, M. Rodriguez-Correa, C. Gallego-Castillo, O. Lopez-Garcia, S. Avila-Sanchez, R. Fernandez-Aldama
Summary: This study focuses on rotational sampling in wind turbine blade loading, using a classical model to establish a parametric analysis and quantify energy transfer in different frequency intervals. It was found that different frequency intervals of the Eulerian spectrum correspond to negative contributions in the rotational spectrum, with certain frequency ranges potentially leading to negative values in the rotational spectrum.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2021)
Article
Engineering, Environmental
Cristobal Gallego-Castillo, Alvaro Cuerva-Tejero, Mohanad Elagamy, Oscar Lopez-Garcia, Sergio Avila-Sanchez
Summary: This article presents a novel method for determining optimal autoregressive models to reproduce a predefined target autocovariance function, utilizing flexibility and genetic algorithms to optimize the generated time series.
STOCHASTIC ENVIRONMENTAL RESEARCH AND RISK ASSESSMENT
(2022)
Article
Chemistry, Analytical
Daniel Alfonso-Corcuera, Mikel Ogueta-Gutierrez, Alejandro Fernandez-Soler, David Gonzalez-Barcena, Santiago Pindado
Summary: This paper presents wind speed measurements using a cup anemometer in a stratospheric balloon mission. The results indicate the importance of considering the horizontal wind speed during the ascent phase of the mission.
Article
Engineering, Civil
Raul Manzanares-Bercial, Omar Gomez-Ortega, Fernando Meseguer-Garrido, Mikel Ogueta-Gutierrez, Sebastian Franchini
Summary: Transversal instabilities caused by longitudinal winds on overhead power lines with spherical warning beacons have been reported in recent years. Transition modes with intermittency between two quasi-stable states of motion were detected. Results of wind tunnel tests showed the presence of intermittency in the aerodynamic lateral force in both the critical and supercritical regimes, with the duration depending on the Reynolds number.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2022)
Article
Engineering, Aerospace
Juan Carlos Matias-Garcia, Rafael Bardera, Estela Barroso, Sebastian Franchini
Summary: This paper analyzes the implementation of the Coanda effect as an active flow control technique to reduce flow detachment above the flight deck. The numerical optimization and wind tunnel experiments show that the Coanda effect can completely eliminate flow detachment and reduce turbulence intensity during helicopter recovery maneuvers. The results demonstrate the effectiveness of flow control techniques in improving pilot workload and flight deck safety.
JOURNAL OF AIRCRAFT
(2023)
Article
Engineering, Marine
J. C. Matias, R. Bardera, S. Franchini, E. Barroso, S. Sor
Summary: This paper compares the effects of three different recovery maneuvers on the flow field around a frigate, using wind tunnel tests and mechanical measurements. The study finds that the stern, diagonal, and L-shaped maneuvers have significant impacts on the helicopter, increasing the pilot's workload on the flight deck. The wake of the ship primarily affects longitudinal and thrust forces, while pitch torque and roll moment become important when the wind angle increases. The evaluation of pilot workload concludes that the L-shaped maneuver is the best for 0 degrees and small WOD angles, and D or S recoveries are preferable for moderately high negative WOD angles.
Article
Engineering, Civil
Elena Lopez-Nunez, Mikel Ogueta-Gutierrez, Omar Gomez-Ortega, Raul Manzanares-Bercial, Elena Roibas-Millan, Sebastian Franchini
Summary: To increase the capacity of a simple bridge, lateral extension decks are added to the main deck. An experimental wind tunnel campaign was conducted to analyze the aeroelastic behavior of a hinged-deck cross-section cable-stayed bridge. The experimental model used a reduced 6 degrees of freedom (DOFs) model to study the bridge's oscillating motion.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Civil
Mohanad Elagamy, Cristobal Gallego-Castillo, Alvaro Cuerva-Tejero, Oscar Lopez-Garcia, Sergio Avila-Sanchez
Summary: In this study, a novel approach is proposed to optimize the calibration parameters of a vector autoregressive model for synthetic generation of turbulent wind fields. The approach is based on eigenanalysis of the companion matrix of the vector autoregressive model. The cross-power spectral density matrix for different turbulent wind conditions is considered as targets and compared with existing approaches for calibration of vector autoregressive model parameters, discussing the implications of determining the vector autoregressive model in the frequency or time domain.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2023)
Article
Construction & Building Technology
Juan A. Cardenas-Rondon, Mikel Ogueta-Gutierrez, Sebastian Franchini, Omar Gomez-Ortega
Summary: This study conducted wind tunnel measurements on a 5:1 rectangular cylinder to analyze the flow characteristics. The pressure distribution was measured in several sections to validate the flow's two-dimensionality. The Proper Orthogonal Decomposition (POD) was used to process the measurements and obtain phase-resolved cycles. The study focused on the behavior of the recirculation bubble and investigated the effects of angle of attack, turbulence intensity, and Reynolds number.
WIND AND STRUCTURES
(2022)
Article
Energy & Fuels
Shitong Fang, Houfan Du, Tao Yan, Keyu Chen, Zhiyuan Li, Xiaoqing Ma, Zhihui Lai, Shengxi Zhou
Summary: This paper proposes a new type of nonlinear VIV energy harvester (ANVEH) that compensates for the decrease in peak energy output at low wind speeds by introducing an auxiliary structure. Theoretical and experimental results show that ANVEH performs better than traditional nonlinear VIV energy harvesters under various system parameter variations.
Article
Energy & Fuels
Wei Jiang, Shuo Zhang, Teng Wang, Yufei Zhang, Aimin Sha, Jingjing Xiao, Dongdong Yuan
Summary: A standardized method was developed to evaluate the availability of solar energy resources in road areas, which combined the Analytic Hierarchy Process (AHP) and the Geographic Information System (GIS). By analyzing critical factors and using a multi-indicator evaluation method, the method accurately evaluated the utilization of solar energy resources and guided the optimal location selection for road photovoltaic (PV) projects. The results provided guidance for the application of road PV projects and site selection for route corridors worldwide, promoting the integration of transportation and energy.
Article
Energy & Fuels
Chang Liu, Jacob A. Wrubel, Elliot Padgett, Guido Bender
Summary: The study investigates the effects of coating defects on the performance of the anode porous transport layer (PTL) in water electrolyzers. The results show that an increasing fraction of uncoated regions on the PTL leads to decreased cell performance, with continuous uncoated regions having a more severe impact compared to multiple thin uncoated strips.
Article
Energy & Fuels
Marcos Tostado-Veliz, Xiaolong Jin, Rohit Bhakar, Francisco Jurado
Summary: In this paper, a coordinated charging price mechanism for clusters of parking lots is proposed. The research shows that enabling vehicle-to-grid characteristics can bring significant economic benefits for users and the cluster coordinator, and vehicle-to-grid impacts noticeably on the risk-averse character of the uncertainty-aware strategies. The developed pricing mechanism can reduce the cost for users, avoiding to directly translate the energy cost to charging points.
Article
Energy & Fuels
Duan Kang
Summary: Building an energy superpower is a key strategy for China and a long-term goal for other countries. This study proposes an evaluation system and index for measuring energy superpower, and finds that China has significantly improved its ranking over the past 21 years, surpassing other countries.
Article
Energy & Fuels
Fucheng Deng, Yifei Wang, Xiaosen Li, Gang Li, Yi Wang, Bin Huang
Summary: This study investigated the synergistic blockage mechanism of sand and hydrate in gravel filling layer and the evolution of permeability in the layer. Experimental models and modified permeability models were established to analyze the effects of sand particles and hydrate formation on permeability. The study provided valuable insights for the safe and efficient exploitation of hydrate reservoirs.
Article
Energy & Fuels
Hao Wang, Xiwen Chen, Natan Vital, Edward Duffy, Abolfazl Razi
Summary: This study proposes a HVAC energy optimization model based on deep reinforcement learning algorithm. It achieves 37% energy savings and ensures thermal comfort for open office buildings. The model has a low complexity, uses a few controllable factors, and has a short training time with good generalizability.
Article
Energy & Fuels
Moyue Cong, Yongzhuo Gao, Weidong Wang, Long He, Xiwang Mao, Yi Long, Wei Dong
Summary: This study introduces a multi-strategy ultra-wideband energy harvesting device that achieves high power output without the need for external power input. By utilizing asymmetry, stagger array, magnetic coupling, and nonlinearity strategies, the device maintains a stable output voltage and high power density output at non-resonant frequencies. Temperature and humidity monitoring are performed using Bluetooth sensors to adaptively assess the device.
Article
Energy & Fuels
Tianshu Dong, Xiudong Duan, Yuanyuan Huang, Danji Huang, Yingdong Luo, Ziyu Liu, Xiaomeng Ai, Jiakun Fang, Chaolong Song
Summary: Electrochemical water splitting is crucial for hydrogen production, and improving the hydrogen separation rate from the electrode is essential for enhancing water electrolyzer performance. However, issues such as air bubble adhesion to the electrode plate hinder the process. Therefore, a methodology to investigate the two-phase flow within the electrolyzer is in high demand. This study proposes using a microfluidic system as a simulator for the electrolyzer and optimizing the two-phase flow by manipulating the micro-structure of the flow.
Article
Energy & Fuels
Shuo Han, Yifan Yuan, Mengjiao He, Ziwen Zhao, Beibei Xu, Diyi Chen, Jakub Jurasz
Summary: Giving full play to the flexibility of hydropower and integrating more variable renewable energy is of great significance for accelerating the transformation of China's power energy system. This study proposes a novel day-ahead scheduling model that considers the flexibility limited by irregular vibration zones (VZs) and the probability of flexibility shortage in a hydropower-variable renewable energy hybrid generation system. The model is applied to a real hydropower station and effectively improves the flexibility supply capacity of hydropower, especially during heavy load demand in flood season.
Article
Energy & Fuels
Zhen Wang, Kangqi Fan, Shizhong Zhao, Shuxin Wu, Xuan Zhang, Kangjia Zhai, Zhiqi Li, Hua He
Summary: This study developed a high-performance rotary energy harvester (AI-REH) inspired by archery, which efficiently accumulates and releases ultralow-frequency vibration energy. By utilizing a magnetic coupling strategy and an accumulator spring, the AI-REH achieves significantly accelerated rotor speeds and enhanced electric outputs.
Article
Energy & Fuels
Yi Yang, Qianyi Xing, Kang Wang, Caihong Li, Jianzhou Wang, Xiaojia Huang
Summary: In this study, a novel hybrid Quantile Regression (QR) model is proposed for Probabilistic Load Forecasting (PLF). The model integrates causal dilated convolution, residual connection, and Bidirectional Long Short-Term Memory (BiLSTM) for multi-scale feature extraction. In addition, a Combined Probabilistic Load Forecasting System (CPLFS) is proposed to overcome the inherent flaws of relying on a single model. Simulation results show that the hybrid QR outperforms traditional models and CPLFS exceeds the best benchmarks in terms of prediction accuracy and stability.
Article
Energy & Fuels
Wen-Jiang Zou, Young-Bae Kim, Seunghun Jung
Summary: This paper proposes a dynamic prediction model for capacity fade in vanadium redox flow batteries (VRFBs). The model accurately predicts changes in electrolyte volume and capacity fade, enhancing the competitiveness of VRFBs in energy storage applications.
Article
Energy & Fuels
Yuechao Ma, Shengtie Wang, Guangchen Liu, Guizhen Tian, Jianwei Zhang, Ruiming Liu
Summary: This paper focuses on the balance of state of charge (SOC) among multiple battery energy storage units (MBESUs) and bus voltage balance in an islanded bipolar DC microgrid. A SOC automatic balancing strategy is proposed considering the energy flow relationship and utilizing the adaptive virtual resistance algorithm. The simulation results demonstrate the effectiveness of the proposed strategy in achieving SOC balancing and decreasing bus voltage unbalance.
Article
Energy & Fuels
Raad Z. Homod, Basil Sh. Munahi, Hayder Ibrahim Mohammed, Musatafa Abbas Abbood Albadr, Aissa Abderrahmane, Jasim M. Mahdi, Mohamed Bechir Ben Hamida, Bilal Naji Alhasnawi, A. S. Albahri, Hussein Togun, Umar F. Alqsair, Zaher Mundher Yaseen
Summary: In this study, the control problem of the multiple-boiler system (MBS) is formulated as a dynamic Markov decision process and a deep clustering reinforcement learning approach is applied to obtain the optimal control policy. The proposed strategy, based on bang-bang action, shows superior response and achieves more than 32% energy saving compared to conventional fixed parameter controllers under dynamic indoor/outdoor actual conditions.