Article
Engineering, Marine
Florin Onea, Eugen Rusu
Summary: The Portuguese nearshore is a suitable environment for the development of marine energy farms, including wave, wind, and solar energy. Based on a 10-year analysis of data, it was found that solar and wind power are more significant in the southern part of the region, while wave power gradually decreases from north to south. Complementarity between solar, wind, and wave resources was highlighted using dimensionless indices. Compared to solar and wind systems, the performance of the selected wave generation system was low.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Thermodynamics
Pasquale Contestabile, Sara Russo, Arianna Azzellino, Furio Cascetta, Diego Vicinanza
Summary: This study evaluates the effects of local sea winds and land breeze circulations on wave-wind resources and proposes a method to estimate the quality of co-exploitation. The findings suggest that under specific thermal wind conditions, combined power production from wind and wave sources is more available and stable, making co-located offshore wind turbines and wave energy converters more attractive.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Nanoscience & Nanotechnology
Nicholas Salonen, Christo Rautenbach
Summary: The study found that Rocky Bank (RB) influences extreme wave occurrences along the eastern periphery of False Bay in South Africa, where wave energy may spatially converge around the seamount and cause wave convergence through refraction. In addition, evidence from recorded incidents and anecdotal evidence suggests that the wave transformation effects of RB may lead to extreme waves in the region.
Article
Environmental Sciences
Milad Rahimi, Mehdi Gholamalifard, Akbar Rashidi, Bonyad Ahmadi, Andrey G. Kostianoy, Aleksander V. Semenov
Summary: The Caspian Sea region, characterized by its rich oil and gas resources, is exploring the potential for offshore wind energy production to compensate for the depletion of hydrocarbon resources and the rise in prices. The study shows that the wind power density in the Caspian Sea is 173W/m(2) on average, with a decreasing trend observed in 57% of the area, particularly in the Northern Caspian region affected by regional climate change.
Article
Environmental Sciences
Elizaveta Kruglova, Stanislav Myslenkov
Summary: The study focuses on the impact of wind variability on storm activity in the Caspian Sea over the past 42 years. Using wave model WAVEWATCH III and the Peak Over Threshold method, the analysis shows positive trends in the number and duration of storms in the whole sea, particularly in the North and Middle Caspian regions. The number of storms in the Middle Caspian is influenced by positive trends in extreme wind situations.
Article
Engineering, Marine
Naghmeh Akbarizadeh, Mohammad Javad Ketabdari
Summary: This paper presents a numerical analysis comparing the performance of a Conventional TLP (CTLP) and an Extended TLP (ETLP) in marine environmental conditions. The study shows that the ETLP demonstrates higher safety and stability than the CTLP under wave, wind, and current loads.
Article
Energy & Fuels
Alina Girleanu, Florin Onea, Eugen Rusu
Summary: The study aims to evaluate the efficiency of a floating wind farm operating in the coastal environment of the western Black Sea and explore the positive impact it might have on the coastal area of Romania. By considering coastal erosion, wave energy, and the influence of the wind farm on longshore currents, the study concludes that the project could provide renewable energy and enhance coastal protection.
Article
Green & Sustainable Science & Technology
Sajjad Zereshkian, Dariush Mansoury
Summary: The research found that ocean thermal energy conversion can only be used in the southern basin during July-September, and the Sardar Jangal field is the most suitable area for the use of solar energy.
Review
Geochemistry & Geophysics
Melissa Moulton, Sutara H. Suanda, Jessica C. Garwood, Nirnimesh Kumar, Melanie R. Fewings, James M. Pringle
Summary: The exchange of material in the nearshore region, from the shoreline to a few kilometers offshore, plays a crucial role in determining the concentrations of pathogens and nutrients near the coast, as well as the transport of larvae. Various cross-shore exchange mechanisms, such as winds, currents, and waves, can influence this process. A framework has been developed to estimate the relative importance of these mechanisms and determine their impact on particle behavior.
ANNUAL REVIEW OF MARINE SCIENCE
(2023)
Article
Oceanography
Stephanie Contardo, Ryan J. Lowe, Francois Dufois, Jeffe Hansen, Mark Buckley, Graham Symonds
Summary: Long waves are important for coastal inundation and erosion, and understanding their evolution in nearshore regions is crucial. A new approach that accounts for partial reflections in wave propagation has been proposed, which provides an analytical solution for the free wave linear shallow-water equations. The approach is supported by numerical modeling and extends the classic solution to arbitrary bathymetry profiles, decomposing it into incoming and outgoing wave components. The model predicts a reflection coefficient that is correlated with the bed slope, revealing the dependence of wave amplitudes on partial reflections.
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2023)
Article
Energy & Fuels
Ana-Maria Chirosca, Liliana Rusu, Anca Bleoju
Summary: Green energy is crucial for reducing greenhouse gas emissions and addressing climate change. The North Sea is a significant region for offshore wind energy in Europe, with the world's largest offshore wind farm located there. This study provides an overview of wind farms, types of turbines, and turbine structures in the North Sea.
Article
Environmental Sciences
Aleksandra Rybalko, Stanislav Myslenkov, Sergei Badulin
Summary: Wave buoy measurements were conducted near the north-eastern Black Sea coast at Utrish natural reserve in 2020-2021. The measured waves primarily propagated from the seaward directions and did not strictly follow the local wind directions, indicating a mixed sea state. The relationship between dimensionless wave heights and periods based on wind speed scaling closely matched previously established empirical laws for wind-driven seas. The results of wave turbulence theory were applied to estimate spectral energy fluxes and their correspondence to turbulent wind pulsations, demonstrating consistency with current understanding of wind-wave interaction. The majority of wind energy flux was found to contribute to the direct Kolmogorov-Zakharov cascade to high wave frequencies and subsequent dissipation in small scales, while less than 1% directed to the low frequency band, facilitating wave energy growth.
Article
Green & Sustainable Science & Technology
Milad Izanloo, Younes Noorollahi, Alireza Aslani
Summary: The study aims to increase the capacity of renewable energies such as biomass, wind, solar, and hydropower in the Mazandaran region in the south of the Caspian Sea, and to improve the efficiency and capacity factor of power plants. By modeling and analyzing six scenarios, the results demonstrate that the share of renewable energies in electricity production in the region can be significantly increased, and by implementing integrated policies, costs can be saved, and trends in CO2 emissions and fossil fuel consumption can be reduced.
Article
Environmental Sciences
Pegah Amjadian, Simon P. Neill, Vicky Marti Barclay
Summary: Due to climate change, there is an urgent need to expand existing and develop new renewable energy technologies. Ocean renewable energy, including offshore wind, wave, and tidal energy converters, offers many opportunities due to abundant resources and availability of sea space. However, energy extraction from the ocean environment will impact sediment dynamics and morphodynamics. This study collected seabed sediment samples from the Irish Sea region to investigate the relationship between environmental variables and sediment characteristics, and to assess the impact and challenges of renewable energy technologies deployed in the region. The findings provide insight into minimizing environmental impacts of ocean energy technologies.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Multidisciplinary Sciences
Lei Duan, Tyler H. Ruggles, Ken Caldeira
Summary: Solar photovoltaics have the potential to replace fossil fuels and contribute to lower-cost zero-emission energy systems. The initial benefits of providing solar power to the electricity system are significant, especially in deep decarbonization scenarios. However, the value of additional solar power decreases as cumulative solar capacities increase. Taking full advantage of low-cost solar energy requires the development and deployment of low-cost approaches to energy supply or electricity load shifting.
Article
Engineering, Multidisciplinary
Catalin Faitar, Eugen Rusu
Summary: The purpose of this study is to provide an overview of the development of modern low-speed marine two-stroke diesel engines with a focus on the technical water cooling system, taking into account market requirements and design options for the shipping industry. The study analyzes various aspects of marine slow turning engines, including the thermodynamic structure of the technical water system and the design criteria for engine components. It also highlights the importance of auxiliary systems and control systems in the installation and operation of the technical water cooling system on board ships. The study concludes by emphasizing the significance of the calculations used to determine the parameters of a technical water generator for a midsized container ship.
Article
Engineering, Multidisciplinary
Viorel Minzu, Eugen Rusu, Iulian Arama
Summary: Execution time is crucial in control structures using metaheuristic-based optimization algorithms. This paper investigates decreasing execution time in the context of Receding Horizon Control, where a metaheuristic algorithm is used for prediction. The concept of adapting the control variables' domains for each sampling period is introduced, along with tuning the domains to maintain convergence. Simulation results demonstrate the practical relevance and significant reduction in execution time achieved using the proposed techniques.
Article
Green & Sustainable Science & Technology
Alina Beatrice Raileanu, Liliana Rusu, Eugen Rusu
Summary: The objective of this study was to analyze meteorological and hydrological processes along the Lower Danube over a period of 30 years. Due to climate change, visible transformations have occurred in the global configuration of the environment matrix in many places. The study focused on wind speed, air temperature, precipitation, and river discharge, with emphasis on extreme values and geographical locations with higher probability of occurrence. The findings showed that maximum wind speed and air temperature remained unchanged, while minimum air temperatures and average temperatures increased. Precipitation exhibited a decreasing trend, while river discharge showed a clear increase. The study provides valuable information for inland navigation and other human activities.
Article
Green & Sustainable Science & Technology
Ramesh Kumar Arunachalam, Kumar Chandrasekaran, Eugen Rusu, Nagananthini Ravichandran, Hady H. Fayek
Summary: A hybrid microgrid system was modelled using HOMER-Pro software to consider real-time load and available energy sources in Elapakkam village, Tamil Nadu, India. Optimization approaches were applied to select the rating of physical components and economic parameters for an optimal-sized and reliable system. A comparison of cost of energy and renewable energy penetration was conducted for different case studies in the village, revealing the potential to minimize emissions through a combination of existing and renewable energy systems.
Article
Chemistry, Multidisciplinary
Hady H. Fayek, Fady H. Fayek, Eugen Rusu
Summary: This paper presents an optimal method for sizing and allocating energy storage in a power system with wind farms. The results show that using pharmacophore modeling optimization with normalization can reduce costs of power losses and voltage deviation, and better meet peak demand.
APPLIED SCIENCES-BASEL
(2023)
Article
Computer Science, Information Systems
Shanmugam Kavitha, Chandrasekaran Kumar, Hady H. Fayek, Eugen Rusu
Summary: This paper presents a design of CNFET-based MT-SRAM using the leakage reduction mechanism. The leakage current during read/write operations is reduced by employing multi-threshold logic. High threshold transistors are inserted in a serial manner to the low threshold circuit, where they contribute to low sub-threshold current. Meanwhile, low threshold transistors improve circuit performance. The implementation of multi-threshold-based SRAM cells using CNFET helps to avoid the short channel effect and mobility degradation in CMOS devices with channel length below 32nm. The paper clearly demonstrates the performance improvement of the proposed SRAM cells with the mentioned technologies.
Article
Engineering, Marine
Alex Magkouris, Eugen Rusu, Liliana Rusu, Kostas Belibassakis
Summary: The increasing availability of solar energy in southern latitudes promotes the development of floating offshore solar energy platforms for sea deployment. This study uses a boundary element method to analyze the hydrodynamics and energy performance of floating structures carrying photovoltaic panels. The results show the significant effects of waves on energy production and suggest that this concept could be a promising alternative for marine renewables, supporting European Green Deal policies.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Marine
Laurentiu-Florin Constantinoiu, Mariana Bernardino, Eugen Rusu
Summary: This article introduces a validated, rapid, and reliable technique for processing hydrographic data obtained via an autonomous hydrographic survey using an unmanned surface vessel (USV) belonging to the Unmanned Survey Solutions (USS) corporation. The experimentation was part of the Multinational Exercise Robotic Experimentation and Prototyping augmented by Maritime Unmanned Systems 22 (REPMUS22) held in Portugal. The objective was to assess the underwater environment for an amphibious landing exercise and evaluate the integration of the multibeam system with the autonomous prototype vessel.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Laura-Ionela Nedelcu, Viorel-Mihai Tanase, Eugen Rusu
Summary: The present study explores the wind energy potential along the Romanian coast of the Black Sea by analyzing weather data from 2009 to 2021. The analysis shows that the wind characteristics are similar across different coastal stations, indicating a favorable environment for wind energy development. The findings suggest that the Romanian Black Sea coast has strong winds, making it a promising location for wind energy projects.
Editorial Material
Engineering, Multidisciplinary
Eugen Rusu, Gabriela Rapeanu
Article
Energy & Fuels
Michael Fratita, Florin Popescu, Eugen Rusu, Ion V. Ion, Razvan Mahu
Summary: The aim of this paper is to provide a comprehensive overview of electricity production from different sources and consumer electricity needs. The Green Deal pact aims to gradually reduce polluting emissions in the energy sector by 2050, closing CO2 intensive thermal power plants and investing in green energy sources. The paper analyzes the profile of the Romanian electricity producer over a year, explores ways to adapt to consumer demand, and examines the national distribution system's capacity. The paper concludes by addressing potential problems with green energy.
Review
Engineering, Marine
Eugen Rusu, Florin Onea
Summary: This study aims to provide a comprehensive picture of wind conditions at important European marine energy sites by analyzing historical and climatological data. The performance of large-scale wind turbines in the range of 15-25 MW is also assessed. The findings suggest that the predicted capacity factor of the new wind generators may exceed 60%, indicating their potential role in the consolidation and expansion of the European green market.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Umapathi Krishnamoorthy, Ushaa Pitchaikani, Eugen Rusu, Hady H. Fayek
Summary: Renewable and distributed energy sources, such as wind turbines, fuel cells, solar cells, and batteries, require power converters to connect them to the grid and make the generated power available for public use. Solar energy, in particular, can power up domestic and industrial loads if utilized properly. A multi-level inverter with a packed U-cell topology and a variable switching frequency-based model predictive controller is presented in this paper, which helps achieve optimal output with reduced harmonics.
Article
Environmental Sciences
V Novac, E. Rusu
Summary: This article presents the oceanographic features of the Black Sea and factors affecting maritime navigation. The A* algorithm is used to find the optimal route while considering economic aspects and ship crew's safety.
JOURNAL OF ENVIRONMENTAL PROTECTION AND ECOLOGY
(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.
