Article
Green & Sustainable Science & Technology
Zhaoheng Lu, Ran Tao, Zhifeng Yao, Weichao Liu, Ruofu Xiao
Summary: This study compares the difference in flow energy dissipation (FED) between two typical guide vanes in turbine mode and pump mode. The results show that the flow rates and FED distribution vary in different modes. The design of the guide vane has a significant impact on hydraulic performance and system stability.
Article
Green & Sustainable Science & Technology
Maxime Binama, Kan Kan, Hui-Xiang Chen, Yuan Zheng, Daqing Zhou, Wen-Tao Su, Alexis Muhirwa, James Ntayomba
Summary: This study investigates the development mechanism of flow instability in the vaneless space of reversible pump turbines, as well as the impact of machine influx and runner blade number on its transferability. Results show that the pressure pulsation level in the vaneless space decreases with decreasing runner blade number, while a continuous decrease in machine influx leads to a corresponding drop in the pulsation level within the turbine zone before gradually increasing in the runaway zone and dropping again in the deep turbine brake operating zone. The effect of machine flow conditions and runner blade number on the propagation mode of flow instability in the vaneless space to upstream flow zones is more significant than in downstream flow zones.
Article
Thermodynamics
Zhiqi Wang, Baoqi Xie, Xiaoxia Xia, Lan Luo, Huya Yang, Xin Li
Summary: The use of entropy production analysis method is effective in diagnosing and evaluating the location with high energy loss and the total energy loss in the radial inflow turbine. Adjusting the outlet angle of the inlet guide vane can improve the turbine performance under off-design conditions and achieve higher efficiency and output power.
Article
Thermodynamics
Fangfang Zhang, Mingkun Fang, Jiale Pan, Ran Tao, Di Zhu, Weichao Liu, Ruofu Xiao
Summary: Based on numerical simulation and experiments, this study proposes a method combining the Center-Radius guide vane profile parameterization method with B-spline curve and Genetic Fuzzy Algorithm for optimizing the guide vane shape of a pump-turbine unit with a guide vane opening of 5 degrees. The study analyzes the grid connection characteristics and operation stability between the initial and optimized units, and the results show that the optimization of guide vane shape can effectively improve operation stability and grid connection performance, providing an optimization idea for the further development of Pumped Storage Hydro (PSH).
Article
Energy & Fuels
Faye Jin, Ran Tao, Di Zhu, Puxi Li, Ruofu Xiao, Weichao Liu
Summary: The flow mechanism of a pump turbine during rapid guide vane adjustment (RGVA) was studied through numerical simulation. It was found that the performance parameters varied exponentially during the process, with the guide vane experiencing the largest change in hydraulic loss and the increase in pressure pulsation caused by structures such as horseshoe and spanwise vortices.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Physics, Multidisciplinary
Yanjun Li, Yi Zhong, Fan Meng, Yunhao Zheng, Danghang Sun
Summary: This research investigates the influence of guide vane meridians on the external characteristics and internal flow field of a mixed-flow pump device. Computational fluid dynamic (CFD) and entropy production theory are applied to analyze the hydraulic loss spread in the pump. The results show that the guide vane outlet diameter has a significant impact on the pump head, efficiency, and entropy production.
Article
Energy & Fuels
Yonglin Qin, Deyou Li, Hongjie Wang, Zhansheng Liu, Xianzhu Wei, Xiaohang Wang
Summary: The study introduces a local hydraulic loss rate method that can better depict hydraulic loss distribution and evolution, compared to the entropy production method.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Engineering, Marine
Weidong Cao, He Wang, Xinyu Yang, Xinyi Leng
Summary: In this study, the methodologies of computational fluid dynamics and response surface method were integrated to uncover the optimal design framework for complex hydraulic geometric parameters of guide vane centrifugal pumps. Through experimental design and response surface approximation models, the optimal design parameters were determined and significant improvements in hydraulic performance were achieved.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Energy & Fuels
Xiuli Mao, Xingkun Chen, Jiahao Lu, Peng Liu, Zhao Zhang
Summary: This study aims to increase the internal fluid stability of the pump turbine of a pumped storage plant by coordinating the regulation of valve and guide vane, improving the operation stability of the system, especially during load rejection.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Engineering, Marine
Di Zhu, Wei Yan, Weilong Guang, Zhengwei Wang, Ran Tao
Summary: This study compares the pressure pulsation when a pump-turbine reaches runaway under different guide vane opening angles through model experiments and computational fluid dynamics simulations. It is found that increasing the guide vane opening leads to an increase in the amplitude of pressure pulsation, with local changes in size and peak. However, when the guide vane opening is between 12 and 20 degrees, the vortex flow intensity does not change much, resulting in a decrease in the amplitude of pressure fluctuations. The study reveals the relationships among velocity field, vortex intensity, and entropy production, and is significant for ensuring the stable operation of pump-turbines.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Zhi-Feng Yu, Wen-Quan Wang, Yan Yan, Xing-Shun Liu
Summary: This paper conducts a comprehensive analysis of flow losses in a Francis turbine using the entropy production method, revealing that hydraulic losses are closely related to flow separation, vortex motion, and backflow. The draft tube accounts for the largest proportion of entropy production, followed by the runner. The method proposed in this paper can explore the location and distribution of energy dissipation under different operating conditions within a certain reasonable range of error.
Article
Energy & Fuels
Xiaolong Fu, Deyou Li, Yechen Song, Hongjie Wang, Jialiang Yang, Xianzhu Wei
Summary: Different head pump turbines (PTs) exhibit significantly different pressure fluctuations (PFs). This study investigates the PFs inside a low-head PT by simulating the co-closing of the guide vane and ball valve after a pump power trip. The study identifies two new frequency components in the PFs of low-head PTs, which can provide important guidance for the design and optimization of these turbines.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Green & Sustainable Science & Technology
Tang Xin, Jiang Wei, Li Qiuying, Gaoyang Hou, Zhang Ning, Wang Yuchuan, Chen Diyi
Summary: The study analyzed the distribution of hydraulic losses in PAT using entropy generation theory. Results showed that energy losses mainly concentrate on guide vane, volute, and runner, with wall effect and velocity fluctuation as primary factors, guiding optimization of corresponding structures design.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Thermodynamics
Gang Yang, Xi Shen, Lei Shi, Jia Meng, Wenhua Luo, Desheng Zhang, B. P. M. (Bart) van Esch
Summary: In this paper, unsteady simulations are conducted to investigate the effects of guide vane openings on the hydrodynamic characteristics of the pump-turbine under stall conditions. The results show that the guide vane openings have a significant influence on the flow pattern, energy loss, pressure fluctuation and radial force. Increasing guide vane openings can exacerbate deep stall, energy loss, pressure fluctuations and radial forces.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Engineering, Marine
Quanwei Liang, Wenzhe Kang, Lingjiu Zhou, Zhengwei Wang
Summary: This paper presents numerical investigations on the unstable self-excited vibrations of guide vanes during steady-state conditions and the pump mode's starting up process. The results indicate that small end wall clearances can lead to unstable guide vane vibrations.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
M. Ahmadifar, K. Benfriha, M. Shirinbayan, A. Aoussat, J. Fitoussi
Summary: This study investigates the impact of innovative polymer-metal interface treatment on the reliability and robustness of hydrogen storage technology. A scaled-down demonstrator was fabricated using rotomolding to examine the mechanical characteristics, damage, and fatigue behaviors of the metal-polymer interface. The findings reveal that sandblasting treatment enhances the resilience of the interface.
JOURNAL OF ENERGY STORAGE
(2024)
Article
Energy & Fuels
A. A. Kandil, Mohamed M. Awad, Gamal I. Sultan, Mohamed S. Salem
Summary: This paper proposes a novel hybrid system that splits solar radiation into visible and thermal components using a beam splitter and integrates a phase change material (PCM) packed bed with a PV cell. Experimental and theoretical analyses show that the hybrid configuration significantly increases the net power output of the system compared to using a PV system alone.
JOURNAL OF ENERGY STORAGE
(2024)
Article
Energy & Fuels
Jinchao Li, Ya Xiao, Shiqiang Lu
Summary: The combination of energy storage and microgrids is crucial in addressing the uncertainty of distributed wind and solar resources. This article proposes a multi microgrid interaction system with electric-hydrogen hybrid energy storage, which optimizes the system's capacity configuration to improve its economy and reliability.
JOURNAL OF ENERGY STORAGE
(2024)
Review
Energy & Fuels
Shri Hari S. Pai, Sarvesh Kumar Pandey, E. James Jebaseelan Samuel, Jin Uk Jang, Arpan Kumar Nayak, HyukSu Han
Summary: This review discusses the structure-property relationship of nickel oxide nanostructures as excellent supercapacitive materials and provides an overview of various preparation methods and strategies to enhance specific capacitance. It comprehensively analyzes the current status, challenges, and future prospects of nickel oxide electrode materials for energy storage devices.
JOURNAL OF ENERGY STORAGE
(2024)
Article
Energy & Fuels
Xiaowei Wu, Xin Dong, Ziqin Liu, Xinyi Wang, Pu Hu, Chaoqun Shang
Summary: The growth of Li dendrites in lithium metal batteries is effectively controlled by constructing a three-dimensional framework on the surface of Li using Ni(OH)2 nanosheets modified Prussian blue tubes. This method provides a homogenous Li+ flux and sufficient space to accommodate the volume change of Li, resulting in suppressed dendrite growth and improved cycling performance.
JOURNAL OF ENERGY STORAGE
(2024)
Article
Energy & Fuels
Yan-Jie Liao, Yi-Yen Hsieh, Yi-Chun Yang, Hsing-Yu Tuan
Summary: We present two-dimensional AgInP2Se6 (AIPSe) bimetallic phosphorus trichalcogenides nanosheets as anodes for advanced alkali metal ion batteries (AMIBs). The introduction of bimetallic components enhances the electronic/ionic conductivity and optimizes the redox dynamics, resulting in superior electrochemical performance. The AIPSe@G anodes achieve high specific capacity, excellent cycle stability, and rate capability in both lithium-ion (LIBs) and potassium-ion batteries (PIBs). The comprehensive full cell tests further demonstrate the stability of AIPSe@G anodes under diverse current regimes.
JOURNAL OF ENERGY STORAGE
(2024)
Article
Energy & Fuels
Chenghu Wu, Weiwei Li, Tong Qian, Xuehua Xie, Jian Wang, Wenhu Tang, Xianfu Gong
Summary: In the context of increasing global environmental pollution and constant increase of carbon emission, hydrogen production from surplus renewable energy and hydrogen transportation using existing natural gas pipelines are effective means to mitigate renewable energy fluctuation, build a decarbonized gas network, and achieve the goal of carbon peak and carbon neutral in China. This paper proposes a quasi-steady-state modeling method of a hydrogen blended integrated electricity-gas system (HBIEGS) considering gas linepack and a sequential second-order cone programming (S-SOCP) method to solve the developed model. The results show that the proposed method improves computational efficiency by 91% compared with a general nonlinear solver.
JOURNAL OF ENERGY STORAGE
(2024)
Article
Energy & Fuels
Jingcen Zhang, Zhi Guo, Yazheng Zhu, Haifeng Zhang, Mengjie Yan, Dong Liu, Junjie Hao
Summary: In this study, a new type of sensible heat storage material was prepared using low-cost steel slag as the main component, providing an effective way of recycling steel slag. By analyzing the effects of different pretreatment steel slag content and sintering temperatures on the organization and properties of heat storage materials, the study found that the steel slag heat storage material exhibited excellent performance and stability under certain conditions.
JOURNAL OF ENERGY STORAGE
(2024)
Article
Energy & Fuels
D. Carrillo-Pena, G. Pelaz, R. Mateos, A. Escapa
Summary: Methanogenic biocathodes have the potential to convert CO2 and electricity into methane, making them suitable for long-term electrical energy storage. They can also function as biological supercapacitors for short-term energy storage, although this aspect has received less attention. In this study, carbon-felt-based MB modified with graphene oxide were investigated for their electrical charge storage capabilities. Results showed that the potential of the electrode during discharging plays a significant role in determining the charge storage capacity.
JOURNAL OF ENERGY STORAGE
(2024)
Article
Energy & Fuels
Marco Gambini, Federica Guarnaccia, Michele Manno, Michela Vellini
Summary: This paper presents an analytical assessment of the energy-power relationship for different material-based hydrogen storage systems. It explores the impact of power demand on the amount of discharged hydrogen and the utilization factor. The results show that metal hydrides have higher specific power compared to liquid organic hydrogen carriers. The study provides insights into the discharge duration and energy utilization of hydrogen storage systems.
JOURNAL OF ENERGY STORAGE
(2024)
Article
Energy & Fuels
Shujahadeen B. Aziz, Rebar T. Abdulwahid, Pshko A. Mohammed, Srood O. Rashid, Ari A. Abdalrahman, Wrya O. Karim, Bandar A. Al-Asbahi, Abdullah A. A. Ahmed, M. F. Z. Kadir
Summary: This study investigates a novel biodegradable green polymer electrolyte for energy storage. Results show that the sample with added glycerol has the highest conductivity. The primary conduction species in the electrolyte are ions. Testing confirms that the sample can withstand a voltage suitable for practical applications.
JOURNAL OF ENERGY STORAGE
(2024)
Article
Energy & Fuels
Binit Kumar, Abhishek Awasthi, C. Suresh, Yongseok Jeon
Summary: This study presents a new numerical model for effective thermal conductivity that overcomes the limitations of previous models. The model can be applied to various shapes and phase change materials, using the same constants. By incorporating the natural convection effect, the model accurately calculates the thermal conductivity. The results of the study demonstrate the effectiveness of the model for different shapes and a wide range of alkanes.
JOURNAL OF ENERGY STORAGE
(2024)
Article
Energy & Fuels
Supak Pattaweepaiboon, Wisit Hirunpinyopas, Pawin Iamprasertkun, Katechanok Pimphor, Supacharee Roddecha, Dirayanti Dirayanti, Adisak Boonchun, Weekit Sirisaksoontorn
Summary: In this study, electrode powder from spent zinc-carbon/alkaline batteries was upcycled into LiMn2O4 cathode and carbon anode for rechargeable lithium-ion batteries. The results show that the upcycled LiMn2O4 exhibits improved electrochemical performance, with higher discharge capacity compared to pristine LiMn2O4. Additionally, the recovered carbon materials show superior cycling performance. This research provides great potential for upcycling waste battery electrodes to high-value cathode and anode materials for lithium-ion battery applications.
JOURNAL OF ENERGY STORAGE
(2024)
Article
Energy & Fuels
Pan Yang, H. D. Yang, X. B. Meng, C. R. Song, T. L. He, J. Y. Cai, Y. Y. Xie, K. K. Xu
Summary: This paper introduces a novel multi-task learning data-driven model called GBLS Booster for accurately assessing the state of health (SOH) and remaining useful life (RUL) of lithium batteries. The model combines the strengths of GBLS and the CNN-Transformers algorithm-based Booster, and the Tree-structured Parzen Estimator (TPE) algorithm is used for optimization. The study devises 10 healthy indicators (HIs) derived from readily available sensor data to capture variations in battery SOH. The random forest method (RF) is employed for feature refinement and data dimension reduction, while the complete empirical mode decomposition (CEEMDAN) method and the Pearson correlation coefficient are used for noise reduction and data point elimination in RUL prediction. The proposed model demonstrates exceptional accuracy, robustness, and generalization capabilities.
JOURNAL OF ENERGY STORAGE
(2024)
Article
Energy & Fuels
M. Arrinda, M. Oyarbide, L. Lizaso, U. Osa, H. Macicior, H. J. Grande
Summary: This paper proposes a robust aging model generation methodology for lithium-ion batteries with any kind of lab-level aging data availability. The methodology involves four phases and ensures the robustness of the aging model through a verification process.
JOURNAL OF ENERGY STORAGE
(2024)
