Article
Thermodynamics
Yanfeng Zhang, Zhiping Guo, Xinyu Zhu, Yuan Li, Xiaowen Song, Chang Cai, Yasunari Kamada, Takao Maeda, Qing'an Li
Summary: This paper investigates the impact of bionic airfoil on the aerodynamic characteristics of an H-type vertical axis wind turbine (VAWT) through numerical simulations. The results show that the static bionic airfoil exhibits better lift performance under certain conditions, leading to improved power output of the wind turbine.
Article
Engineering, Marine
Mithinga Basumatary, Agnimitra Biswas, Rahul Dev Misra
Summary: The present study aims to harness hydropower using a combination of lift and drag-based blades in a vertical axis water turbine design. The hydrodynamic performance of the proposed turbine has been thoroughly investigated through flow physics study for different water speeds and azimuthal angles. The effect of the overlap ratio in the straight blade section has also been studied to further explore the turbine performance. Results show that the proposed combined lift and drag turbine performs optimally at specific parameters.
JOURNAL OF MARINE SCIENCE AND TECHNOLOGY
(2023)
Article
Green & Sustainable Science & Technology
Jintao Zhang, Chao Wang, Wenhao Liu, Jianyang Zhu, Yangyang Yan, Hui Zhao
Summary: In order to improve the energy capture performance of vertical axis lift wind turbines in low wind speed environments, a drag wind turbine is used in conjunction with the existing design. A computational model is proposed to simulate the interaction between the turbine and the fluid. The effects of pitch angle, installation angle, overlap ratio, and diameter ratio on the energy capture performance are systematically analyzed, showing that the optimized hybrid wind turbine has a significantly higher energy capture coefficient and output power compared to a pure lift or drag turbine.
Article
Engineering, Marine
Yanjing Gao, Hongwei Liu, Yonggang Lin, Yajing Gu, Yiming Ni
Summary: Rivers in China carry a significant amount of sediment, with much higher concentrations compared to other countries. This study used a CFD-DPM model to investigate the effect of particles on the performance of tidal current turbine blades and found that small diameter particles can improve power while large diameter particles reduce power.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Qiang Gao, Shuai Lian, Hongwei Yan
Summary: This paper proposes a drag-lift hybrid wind turbine structure based on the NACA0018 symmetrical airfoil, which can adaptively change the blade shape to improve self-starting performance and wind energy utilization efficiency. Through CFD numerical simulation and wind tunnel experiments, the performance of the design is studied and analyzed from multiple angles, and the blade morphology switching is controlled by a spring.
Article
Green & Sustainable Science & Technology
Samuel Mitchell, Iheanyichukwu Ogbonna, Konstantin Volkov
Summary: The study on a novel vented aerofoil aims to improve the performance of lift-driven VAWTs at low TSRs without compromising performance at high TSRs. Computational fluid dynamics simulations show changes in the coefficient of tangential force at different AOAs, leading to a potential 20% increase in torque generation.
Article
Engineering, Multidisciplinary
Emmanuel Yeboah Osei, Richard Opoku, Albert K. Sunnu, Muyiwa S. Adaramola, Ebenezer Adu Kyeremeh
Summary: This study tested the aerodynamic performance characteristics of three new EYO-Series airfoils at low Reynolds numbers. The results showed improvements in aerodynamic performance with increasing Reynolds numbers for all three airfoils. EYO9-8 had the highest stall angle at different Reynolds numbers, and all three airfoils exhibited good drag performance.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Energy & Fuels
Pengfei Yan, Yaning Li, Qiang Gao, Shuai Lian, Qihui Wu
Summary: In this study, an adaptive double-drive lift-drag composite vertical-axis wind turbine was designed to improve wind energy utilization rate. The results showed that the turbine performed better than conventional lift-type wind turbines, with a higher wind energy utilization rate.
Article
Engineering, Ocean
Sercan Yagmur, Faruk Kose
Summary: In this study, CFD analysis was conducted on the wake region of an H-type Darrieus hydrokinetic turbine, showing that the SST k-? model can effectively predict power coefficients and flow characteristics. The 3D analysis results are in good agreement with the experimental data trends, although there are slight variations in the power coefficient results.
APPLIED OCEAN RESEARCH
(2021)
Article
Green & Sustainable Science & Technology
Ahmed Gharib Yosry, Eduardo Alvarez Alvarez, Rodolfo Espina Valdes, Adrian Pandal, Eduardo Blanco Marigorta
Summary: Vertical-axis hydrokinetic turbines are a promising technology for harnessing low velocity currents. However, the interactions between the turbine rotor and the channel section, including the free-surface, have not been thoroughly investigated. In this study, a vertical-axis turbine model was designed and tested in an open channel, and a three-dimensional multiphase simulation was carried out to investigate the effects of free-surface variations on turbine performance. The experimental and numerical results showed good agreement, and the simulation model successfully captured the free-surface variations and the turbine's blockage of the channel. Additionally, the analysis of the blade-plate interaction generated vortex street.
Article
Green & Sustainable Science & Technology
Longjun Wang, Md. Mahbub Alam, Shafiqur Rehman, Yu Zhou
Summary: This work experimentally investigates the effects of blowing and suction jets on the aerodynamic performance of a NACA0012 airfoil at a moderate Reynolds number Re = 1.0 x 10(5). The results show that a single blowing jet located at 0.2c from the leading edge of the airfoil has the best performance in increasing the lift.
Article
Green & Sustainable Science & Technology
Andrew Barnes, Daniel Marshall-Cross, Ben Richard Hughes
Summary: The development of VAWTs has faced challenges in design and testing procedures, with issues related to accuracy, computational time, and cost. Previous preference for HAWTs has limited investment in VAWT development, but the use of CFD analysis has allowed for increased research and improved efficiency in VAWTs compared to HAWTs. This review aims to establish a consensus on accurate and effective aerodynamic testing and design of VAWTs.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Engineering, Marine
Zhen-qi Li, Guang-nian Li, Lin Du, Hai-peng Guo, Wen-xin Yuan
Summary: This study focuses on the key technologies of hydraulic turbine geometric modeling and reconstruction. The blade element momentum theory is adopted to obtain the distribution of the twist angle and chord of the blade, and a parameterized model of the original rotor is established. Further, the artificial neural network and the Genetic Algorithm (GA) are used to optimize the performance of the original blades. According to numerical simulations based on Computational Fluid Dynamics (CFD), the energy conversion efficiency of the optimized rotor is higher than that of the original rotor, with an improvement of up to 8.5% under the considered blade-tip speed ratios, and the thrust coefficient is significantly increased.
Article
Thermodynamics
Het Bhavsar, Sukanta Roy, Hakeem Niyas
Summary: This study focuses on solving the aerodynamic problem of thick airfoils by introducing a lift control device - slot. The results show that introducing a slot at a specific position on the thick airfoil can significantly improve the lift and drag coefficients.
Article
Green & Sustainable Science & Technology
Omid Atlaschian, M. Metzger
Summary: This study aims to estimate the performance of a Vertical Axis Wind Turbine (VAWT) in urban/suburban areas over a full year and predict the Levelized Cost of Energy (LCOE) in comparison to national electricity prices through numerical strategies. Wind speed data from Oklahoma City were used for input, and three numerical models including CFD, BEM, and a transient response model were implemented. Results indicate that the LCOE of VAWT can be equal to or lower than the national average electricity price under specific wind speed conditions.
Article
Construction & Building Technology
Mark Kyeredey Ansah, Xi Chen, Hongxing Yang, Lin Lu, Patrick T. Lam
SUSTAINABLE CITIES AND SOCIETY
(2020)
Article
Energy & Fuels
Qiliang Wang, Honglun Yang, Shuai Zhong, Yihang Huang, Mingke Hu, Jingyu Cao, Gang Pei, Hongxing Yang
Article
Energy & Fuels
Haiying Sun, Xiaoxia Gao, Hongxing Yang
Article
Materials Science, Ceramics
Boxu Shen, Yuanhao Wang, Lin Lu, Hongxing Yang
CERAMICS INTERNATIONAL
(2020)
Article
Thermodynamics
Jia Liu, Meng Wang, Jinqing Peng, Xi Chen, Sunliang Cao, Hongxing Yang
ENERGY CONVERSION AND MANAGEMENT
(2020)
Article
Green & Sustainable Science & Technology
Qiliang Wang, Honglun Yang, Mingke Hu, Jingyu Cao, Gang Pei, Hongxing Yang
Summary: This study analyzes the emissive heat loss around the parabolic trough solar receiver, proposes the concept of a negative thermal-flux region, and designs a new parabolic trough receiver with an inner radiation shield to reduce heat loss and enhance heat-collecting performance. This innovative approach shows great potential for breakthrough enhancement in the performance of parabolic trough collector systems.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Green & Sustainable Science & Technology
Du Jiyu, Zhicheng Shen, Hongxing Yang
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2020)
Review
Thermodynamics
Guoqing Yu, Hongxing Yang, Zhenye Yan, Mark Kyeredey Ansah
Summary: Facade-based building integrated photovoltaic-thermal (BIPVT) systems combine solar photovoltaics (PV) and solar collectors to generate electricity and produce thermal energy for buildings. This approach can significantly improve solar energy efficiency and reduce heating/cooling load, making it a promising method for developing low-energy or zero-energy buildings. Research on various types of BIPVT designs and their applications globally has been comprehensively evaluated in this review.
APPLIED THERMAL ENGINEERING
(2021)
Article
Green & Sustainable Science & Technology
Junchao Huang, Xi Chen, Jinqing Peng, Hongxing Yang
Summary: This paper presents an integrated photovoltaic vacuum glazing unit and uses a modeling approach to quantify its thermal properties and evaluate its heat transfer performance. Results show that the photovoltaic vacuum double glazing performs best among the four configurations and can be further improved through design optimizations.
Review
Energy & Fuels
Zhenpeng Li, Tao Ma, Hongxing Yang, Lin Lu, Ruzhu Wang
Summary: Building-integrated photovoltaics (BIPVs) offer a promising solution for providing renewable electricity for achieving zero-energy buildings, but are hindered from large-scale implementations due to the difficulty of traditional photovoltaic modules in meeting the standards and aesthetics of architectural materials. The emergence of new photovoltaic materials and devices could pave the way for the future by offering diversity in colors and transparency along with comparable performance.
Article
Chemistry, Multidisciplinary
Zhenpeng Li, Tao Ma, Senji Li, Wenbo Gu, Lin Lu, Hongxing Yang, Yanjun Dai, Ruzhu Wang
Summary: This study presents a colorization strategy for solar PVs using photonic glass. By depositing a photonic glass layer on silicon solar cells, it enables the cells to have structural colors. These colored solar cells have low power conversion efficiency loss and can be encapsulated to produce PV modules with various colors and patterns.
Article
Automation & Control Systems
Shilin Sun, Tianyang Wang, Hongxing Yang, Fulei Chu
Summary: Condition monitoring (CM) of machinery is crucial for ensuring industrial process reliability. Semisupervised CM can be implemented by training on healthy samples, but data variability from complex machinery can impair CM performance. This study proposes an adversarial representation learning method to address these issues. By reconstructing operating data in signal and latent spaces and using adversarial evolution, this method obtains data representations of health conditions, reduces redundant information, and imposes constraints on unhealthy data. Experiments in wind power generation scenarios demonstrate the satisfactory performance of the proposed method.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Construction & Building Technology
Xiaochen Ma, Wenchao Shi, Hongxing Yang
Summary: The actual wetting factor of the plate surface and the movement of spray droplets are important factors in the performance of indirect evaporative cooling (IEC) systems. A 3D computational fluid dynamics (CFD) model that considers these factors is proposed in this study. The model accurately predicts the performance of IEC systems and provides insights for further improvement.
JOURNAL OF BUILDING ENGINEERING
(2024)
Article
Automation & Control Systems
Shilin Sun, Tianyang Wang, Hongxing Yang, Fulei Chu
Summary: In this article, an environmentally adaptive and contrastive representation learning method is proposed to improve the accuracy of asset condition monitoring. The method utilizes regression models and contrastive learning to obtain valid data representations. Moreover, the method establishes a reference statue for healthy assets and employs control charts for online monitoring. The remarkable performance of the method is demonstrated with real-world measurements and comparative analysis.
IEEE TRANSACTIONS ON CYBERNETICS
(2022)
Article
Engineering, Environmental
Zhe Song, Meng Wang, Hongxing Yang
Summary: This study quantifies the effects of PM2.5 on surface solar irradiance and the performance of different solar PV technologies in Hong Kong. The results show that PM2.5 concentration can lead to a decrease in solar irradiance and energy output of PV systems.
ACS ENVIRONMENTAL AU
(2022)
Article
Thermodynamics
Yong Cheng, Fukai Song, Lei Fu, Saishuai Dai, Zhiming Yuan, Atilla Incecik
Summary: This paper investigates the accessibility of wave energy absorption by a dual-pontoon floating breakwater integrated with hybrid-type wave energy converters (WECs) and proposes a hydraulic-pneumatic complementary energy extraction method. The performance of the system is validated through experiments and comparative analysis.
Article
Thermodynamics
Jing Gao, Chao Wang, Zhanwu Wang, Jin Lin, Runkai Zhang, Xin Wu, Guangyin Xu, Zhenfeng Wang
Summary: This study aims to establish a new integrated method for biomass cogeneration project site selection, with a focus on the application of the model in Henan Province. By integrating Geographic Information System and Multiple Criterion Decision Making methods, the study conducts site selection in two stages, providing a theoretical reference for the construction of biomass cogeneration projects.
Article
Thermodynamics
Mert Temiz, Ibrahim Dincer
Summary: The current study presents a hybrid small modular nuclear reactor and solar-based system for sustainable communities, integrating floating and bifacial photovoltaic arrays with a small modular reactor. The system efficiently generates power, hydrogen, ammonia, freshwater, and heat for residential, agricultural, and aquaculture facilities. Thermodynamic analysis shows high energy and exergy efficiencies, as well as large-scale ammonia production meeting the needs of metropolitan areas. The hybridization of nuclear and solar technologies offers advantages of reliability, environmental friendliness, and cost efficiency compared to renewable-alone and fossil-based systems.
Editorial Material
Thermodynamics
Wojciech Stanek, Wojciech Adamczyk
Article
Thermodynamics
Desheng Xu, Yanfeng Li, Tianmei Du, Hua Zhong, Youbo Huang, Lei Li, Xiangling Duanmu
Summary: This study investigates the optimization of hybrid mechanical-natural ventilation for smoke control in complex metro stations. The results show that atrium fires are more significantly impacted by outdoor temperature variations compared to concourse/platform fires. The gathered high-temperature smoke inside the atrium can reach up to 900 K under a 5 MW train fire energy release. The findings provide crucial engineering insights into integrating weather data and adaptable ventilation protocols for smoke prevention/mitigation.
Article
Thermodynamics
Da Guo, Heping Xie, Mingzhong Gao, Jianan Li, Zhiqiang He, Ling Chen, Cong Li, Le Zhao, Dingming Wang, Yiwei Zhang, Xin Fang, Guikang Liu, Zhongya Zhou, Lin Dai
Summary: This study proposes a new in-situ pressure-preserved coring tool and elaborates its pressure-preserving mechanism. The experimental and field test results demonstrate that this tool has a high pressure-preservation capability and can maintain a stable pressure in deep wells. This study provides a theoretical framework and design standards for the development of similar technologies.
Article
Thermodynamics
Aolin Lai, Qunwei Wang
Summary: This study assesses the impact of China's de-capacity policy on renewable energy development efficiency (REDE) using the Global-MSBM model and the difference-in-differences method. The findings indicate that the policy significantly enhances REDE, promoting technological advancements and marketization. Moreover, regions with stricter environmental regulations experience a higher impact.
Article
Thermodynamics
Mostafa Ghasemi, Hegazy Rezk
Summary: This study utilizes fuzzy modeling and optimization to enhance the performance of microbial fuel cells (MFCs). By simulating and analyzing experimental data sets, the ideal parameter values for increasing power density, COD elimination, and coulombic efficiency were determined. The results demonstrate that the fuzzy model and optimization methods can significantly improve the performance of MFCs.
Article
Thermodynamics
Zhang Ruan, Lianzhong Huang, Kai Wang, Ranqi Ma, Zhongyi Wang, Rui Zhang, Haoyang Zhao, Cong Wang
Summary: This paper proposes a grey box model for fuel consumption prediction of wing-diesel hybrid vessels based on feature construction. By using both parallel and series grey box modeling methods and six machine learning algorithms, twelve combinations of prediction models are established. A feature construction method based on the aerodynamic performance of the wing and the energy relationship of the hybrid system is introduced. The best combination is obtained by considering the root mean square error, and it shows improved accuracy compared to the white box model. The proposed grey box model can accurately predict the daily fuel consumption of wing-diesel hybrid vessels, contributing to operational optimization and the greenization and decarbonization of the shipping industry.
Article
Thermodynamics
Huayi Chang, Nico Heerink, Junbiao Zhang, Ke He
Summary: This study examines the interaction between off-farm employment decisions between couples and household clean energy consumption in rural China, and finds that two-paycheck households are more likely to consume clean energy. The off-farm employment of women is a key factor driving household clean energy consumption to a higher level, with wage-employed wives having a stronger influence on these decisions than self-employed ones.
Article
Thermodynamics
Hanguan Wen, Xiufeng Liu, Ming Yang, Bo Lei, Xu Cheng, Zhe Chen
Summary: Demand-side management is crucial to smart energy systems. This paper proposes a data-driven approach to understand the relationship between energy consumption patterns and household characteristics for better DSM services. The proposed method uses a clustering algorithm to generate optimal customer groups for DSM and a deep learning model for training. The model can predict the possibility of DSM membership for a given household. The results demonstrate the usefulness of weekly energy consumption data and household socio-demographic information for distinguishing consumer groups and the potential for targeted DSM strategies.
Article
Thermodynamics
Xinglan Hou, Xiuping Zhong, Shuaishuai Nie, Yafei Wang, Guigang Tu, Yingrui Ma, Kunyan Liu, Chen Chen
Summary: This study explores the feasibility of utilizing a multi-level horizontal branch well heat recovery system in the Qiabuqia geothermal field. The research systematically investigates the effects of various engineering parameters on production temperature, establishes mathematical models to describe their relationships, and evaluates the economic viability of the system. The findings demonstrate the significant economic feasibility of the multi-level branch well system.
Article
Thermodynamics
Longxin Zhang, Songtao Wang, Site Hu
Summary: This investigation reveals the influence of tip leakage flow on the modern transonic rotor and finds that the increase of tip clearance size leads to a decline in rotor performance. However, an optimal tip clearance size can extend the rotor's stall margin.
Article
Thermodynamics
Kristian Gjoka, Behzad Rismanchi, Robert H. Crawford
Summary: This paper proposes a framework for assessing the performance of 5GDHC systems and demonstrates it through a case study in a university campus in Melbourne, Australia. The results show that 5GDHC systems are a cost-effective and environmentally viable solution in mild climates, and their successful implementation in Australia can create new market opportunities and potential adoption in other countries with similar climatic conditions.
Article
Thermodynamics
Jianwei Li, Guotai Wang, Panpan Yang, Yongshuang Wen, Leian Zhang, Rujun Song, Chengwei Hou
Summary: This study proposes an orientation-adaptive electromagnetic energy harvester by introducing a rotatable bluff body, which allows for self-regulation to cater for changing wind flow direction. Experimental results show that the output power of the energy harvester can be greatly enhanced with increased rotatory inertia of the rotating bluff body, providing a promising solution for harnessing wind-induced vibration energy.