Article
Engineering, Marine
Jianxin Zhang, Wenlong Cheng, Xinglei Cheng, Piguang Wang, Tianju Wang
Summary: This research conducted three-dimensional finite element analysis to predict the seismic responses of suction buckets in clays, investigated the seismic bearing mechanism of bucket foundation in clays, and analyzed various factors affecting seismic responses such as soil strength, seismic intensity and frequency, and bucket geometry. The research results can provide valuable reference for the seismic design of suction bucket foundations for offshore wind turbines.
Article
Engineering, Marine
Xinglei Cheng, Wenlong Cheng, Piguang Wang, M. Hesham El Naggar, Jianxin Zhang, Zhongxian Liu
Summary: This study investigates the dynamic behavior of tripod suction buckets installed in clay using advanced three-dimensional nonlinear finite element analysis. The frequency content of ground motion has a significant effect on the dynamic response of tripod foundations, which should be considered in the seismic design of offshore wind turbines.
Article
Engineering, Marine
Chaojun Yan, Haijun Wang, Yaohua Guo, Zhen Wang, Xiao Liu
Summary: This study proposed a new integrated wet-towing method for the jacket + triple-bucket foundation composite structure, suitable for far-offshore wind power applications. Through static-model tests, the natural period and stability of the foundation were evaluated, and the effects of different wet-towing modes and sea conditions on the stability of the structure were investigated. Additionally, the optimal wet-towing mode and applicable sea conditions for the foundation structure were determined.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Energy & Fuels
Yeong-Hoon Jeong, Kil-Wan Ko, Dong-Soo Kim, Jae-Hyun Kim
Summary: This study analyzed the behavior of tripod suction bucket foundation under cyclic loading, emphasizing the importance of load characteristics in design.
Article
Engineering, Marine
Xiangchuan Meng, Xu Yang, Chao Liang, Jijian Lian, Run Liu, Yangbo Liu, Ronghui Jiang
Summary: The cost of foundations for offshore wind turbines accounts for approximately 35% of the total cost of an offshore wind farm. Bucket foundations have the potential for cost savings up to 30% due to their superior transportation and installation efficiencies compared to pile foundations. However, there is a lack of clarity on how to select a suitable calculation method for penetration resistance based on known geological parameters to guide construction.
Article
Energy & Fuels
Duc-Vu Ngo, Young-Jin Kim, Dong-Hyawn Kim
Summary: This study proposed a new suction bucket foundation model suitable for a shallow muddy seabed for offshore wind turbines. The performance of the new foundation was evaluated and compared with a conventional suction bucket foundation. The results showed that the new foundation had better bearing capacity despite its smaller size.
Article
Engineering, Marine
Puyang Zhang, Nan Jia, Conghuan Le, Hongyan Ding
Summary: The penetration of bucket foundation in sandy soil is complex, influenced by factors such as suction, skirt plate, and inner compartment plates. Choosing the correct leveling strategy is crucial to prevent penetration damage. Applying suction to multiple chambers is found to be safer than negative pressure suction on one chamber. The study also highlights the limitations of negative pressure leveling method in terms of inclination angle and penetration depth.
Article
Engineering, Civil
Ding Hong-yan, Feng Zun-tao, Zhang Pu-yang, Le Cong-huan
Summary: This paper investigates the stability of composite bucket foundation during towing. The analysis of field measurements data shows that the compartment pressure changes are small for different water depths and towing speeds, indicating the stability of the offshore wind turbine composite bucket foundation during towing in the ocean.
CHINA OCEAN ENGINEERING
(2022)
Article
Engineering, Marine
Jijian Lian, Fangdi Ye, Pengwen Wang, Yaohua Guo, Haijun Wang, Tianrun Xiao, Dongzhi Xiong
Summary: This study proposes a U and K shaped assembled platform (U&KSAP) for the integrated transportation and installation of offshore wind turbine (OWT) and bucket foundation (BF) in distant and deep-sea wind farms. Experimental results show that U&KSAP has good seakeeping and is capable of integrated transportation. The motion behavior of OWT&BF and U&KSAP is more sensitive to wave height and period, especially near the resonant period.
Article
Engineering, Marine
Lingqian Meng, Yaohua Guo, Haijun Wang, Xiao Liu
Summary: Finite element software SESAM was used to analyze the floating stability of integrated suction bucket jacket foundation during wet towing. The results show that the structure can meet the requirements of long-distance wet-towing in level 5 sea conditions.
SHIPS AND OFFSHORE STRUCTURES
(2023)
Article
Engineering, Ocean
Junni Jiang, Jijian Lian, Xiaofeng Dong, Haijun Wang, Huan Zhou
Summary: This paper focuses on the calculation of soil damping for Offshore Wind Turbines (OWTs) supported by Wide-Shallow Bucket Foundation (WSBF). Through prototype observation, modal frequency identification, and Genetic Algorithm, an accurate theoretical estimation of soil damping for WSBF was achieved. The study concludes that soil damping increases with the compression modulus and decreases with the Plasticity Index (PI).
APPLIED OCEAN RESEARCH
(2021)
Article
Engineering, Marine
Yaohua Guo, Yue Zhao, Shengxiao Zhao, Haijun Wang, Jijian Lian
Summary: The construction of deep-sea and offshore wind farms is crucial for the development of offshore wind power. This study reviews the latest developments in bottom supporting structures and installation methods, and introduces a novel integrated floating method. The proposed method has been validated and shown to enable efficient and quick installation under specific conditions.
SHIPS AND OFFSHORE STRUCTURES
(2023)
Article
Engineering, Geological
Xue-Qian Qu, Zi-Tao Zhang, Jing Hu, Rui Wang, Jian-Min Zhang
Summary: This study evaluates the seismic response of suction bucket foundations for offshore wind turbines in liquefiable ground through centrifuge shaking table tests. It is found that horizontal displacement of the seabed during earthquakes can lead to excessive rotation and displacement of the foundation. The inside-bucket soil plays a crucial role in stabilizing the system during earthquakes, limiting the displacement and rotation of the foundation and acceleration of the turbine.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2021)
Article
Engineering, Marine
Peiyuan Lin, Xingming Zhong, Chengchao Guo, Fan Yang, Fuming Wang
Summary: This study establishes a database with 114 measured jacking-installation resistance data to evaluate the uncertainty of current API methods. The results show that the predicted installation resistance by the current API models is underestimated by about one third without considering the soil plug effect, and overestimated by five times with the soil plug effect. The prediction accuracy has a medium to extremely high dispersion and is statistically dependent on the magnitude of the predicted installation resistance. A unified API model is proposed by introducing a soil plug factor and two empirical terms, which improves the accuracy and eliminates the statistical dependency.
Article
Engineering, Marine
Jijian Lian, Junni Jiang, Xiaofeng Dong, Haijun Wang, Huan Zhou
Summary: This study proposed an estimation approach for total damping of an offshore wind turbine supported by a wide-shallow bucket foundation, and verified its effectiveness through calculations and measurements. The results showed good agreement with an average deviation of 11.20% between the computed and measured damping values.
Article
Thermodynamics
Pengcheng Zhao, Jingang Wang, Liming Sun, Yun Li, Haiting Xia, Wei He
Summary: The production of green hydrogen through water electrolysis is crucial for renewable energy utilization and decarbonization. This research explores the optimal electrode configuration and system design of compactly-assembled industrial electrolyzer. The findings provide valuable insights for industrial application of water electrolysis equipment.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
V. Baiju, P. Abhishek, S. Harikrishnan
Summary: Thermally driven adsorption desalination systems (ADS) have gained attention as an eco-friendly solution for water scarcity. However, they face challenges related to low water productivity and scalability. To overcome these challenges, integrating ADS with other desalination technologies can create a small-scale hybrid system. This study proposes integrating ADS with a Thermo Electric Dehumidification (TED) unit to enhance its performance.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
C. X. He, Y. H. Liu, X. Y. Huang, S. B. Wan, Q. Chen, J. Sun, T. S. Zhao
Summary: A decentralized centroid multi-path RC network model is constructed to improve the temperature prediction accuracy compared to traditional RC models. By incorporating multiple heat flow paths and decentralizing thermal capacity, a more accurate prediction is achieved.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Chaoying Li, Meng Wang, Nana Li, Di Gu, Chao Yan, Dandan Yuan, Hong Jiang, Baohui Wang, Xirui Wang
Summary: There is an urgent need to shift away from heavy dependence on fossil fuels and embrace renewable energy sources, particularly in the energy-intensive oil refining process. This study presents an innovative concept called the Solar Oil Refinery, which applies solar energy in oil refining. A solar multi-energies-driven hybrid chemical oil refining system that utilizes solar pyrolysis and electrolysis has been developed, significantly improving solar utilization efficiency, cracking rate, and hydrogen yield.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Chao Ma, Guanghui Wang, Dingbiao Wang, Xu Peng, Yushen Yang, Xinxin Liu, Chongrui Yang, Jiaheng Chen
Summary: This study proposes a bio-inspired fish-tail wind rotor to improve the wind power efficiency of the traditional Savonius rotor. Through transient simulations and orthogonal experiments, the key factors affecting the performance are identified. A response surface model is constructed to optimize the power coefficient, resulting in an improvement of 9.4% and 6.6% compared to the Savonius rotor.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Sina Bahmanziari, Abbas-Ali Zamani
Summary: This paper proposes a new framework for improving electrical energy harvesting from piezoelectric smart tiles through a combination of magnetic plucking, mechanical impact, and mechanical vibration force mechanisms. Experimental results demonstrate a significant increase in energy yield and average energy harvesting time compared to other mechanisms.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Nanjiang Dong, Tao Zhang, Rui Wang
Summary: This study establishes a multiobjective mixed-variable configuration optimization model for a comprehensive combined cooling, heating, and power energy system, and proposes an efficient generating operator to optimize this model. The experimental results show that the proposed algorithm performs better than other state-of-the-art algorithms.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Ahmed E. Mansy, Eman A. El Desouky, Tarek H. Taha, M. A. Abu-Saied, Hamada El-Gendi, Ranya A. Amer, Zhen-Yu Tian
Summary: This study aims to convert office paper waste into bioethanol through a sustainable pathway. The results show that physiochemical and enzymatic hydrolysis of the waste can yield a high glucose concentration. The optimal conditions were determined using the Box-Behnken design, and a blended membrane was used for ethanol purification.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Sven Klute, Marcus Budt, Mathias van Beek, Christian Doetsch
Summary: Heat pumps are crucial for decarbonizing heat supply, and steam generating heat pumps have the potential to decarbonize the industrial sector. This paper presents the current state, technical and economic data, and modeling principles of steam generating heat pumps.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Le Zhang, To-Hung Tsui, Yen Wah Tong, Pruk Aggarangsi, Ronghou Liu
Summary: This study investigates the effectiveness of a current-carrying-coil-based magnetic field in promoting anaerobic digestion of chicken manure. The results show that the applied magnetic field increases methane yield, decreases carbon dioxide production, and reduces the concentration of ammonia nitrogen. Microbial community analysis reveals the enrichment of certain methanogenic genera and enhanced metabolic pathways. Pilot-scale experiments confirm the technical effectiveness of the magnetic field assistance in enhancing anaerobic digestion of chicken manure.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Bo Chen, Ruiqing Ma, Yang Zhou, Rui Ma, Wentao Jiang, Fan Yang
Summary: This paper presents an advanced energy management strategy for fuel cell hybrid electric heavy-duty vehicles, focusing on speed planning and energy allocation. By utilizing predictive co-optimization control, this strategy ensures safe inter-vehicle distance and minimizes energy demand. Simulation results demonstrate the effectiveness of the proposed method in reducing fuel cell degradation cost and overall operation cost.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Fabio Fatigati, Roberto Cipollone
Summary: Organic Rankine Cycle-based microcogeneration systems that use solar sources to generate electricity and hot water can help reduce CO2 emissions in residential energy-intensive sectors. The adoption of a recuperative heat exchanger in these systems improves efficiency, reduces thermal power requirements, and saves on electricity costs.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Lipeng He, Renwen Liu, Xuejin Liu, Xiaotian Zheng, Limin Zhang, Jieqiong Lin
Summary: This research proposes a piezoelectric-electromagnetic hybrid energy harvester (PEHEH) for low-frequency wave motion and self-sensing wave environment monitoring. The PEHEH shows promising power output and the ability to self-power and self-sense the wave environment.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Shangling Chu, Yang Liu, Zipeng Xu, Heng Zhang, Haiping Chen, Dan Gao
Summary: This paper studies a distributed energy system integrated with solar and natural gas, analyzes the impact of different parameters on its energy utilization and emissions reduction, and obtains the optimal solution through an optimization algorithm. The results show that compared to traditional separation production systems, this integrated system achieves higher energy utilization and greater reduction in carbon emissions.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Qingpu Li, Yaqi Ding, Guangming Chen, Yongmei Xuan, Neng Gao, Nian Li, Xinyue Hao
Summary: This paper proposes and studies a piston-type thermally-driven pump with a structure similar to a linear compressor, aiming to eliminate the high-quality energy consumption of existing pumps and replace mechanical pumps. The coupling mechanism of working fluid flow and element dimension is analyzed based on force analysis, and experimental data analysis is used to determine the pump operation stroke. Theoretical simulation is conducted to analyze the correlation mechanism of the piston assembly. The research shows that the thermally-driven pump can greatly reduce power consumption and has potential for industrial applications.
ENERGY CONVERSION AND MANAGEMENT
(2024)