Article
Thermodynamics
Margarida C. Pagaimo, Joao F. P. Fernandes, Modesto Perez-Sanchez, P. Amparo Lopez-Jimenez, Helena M. Ramos, P. J. Costa Branco
Summary: The study evaluated the reliability of two pumps as turbines connected in series under transient off-grid conditions, showing that changes in one group significantly impact the dynamics of the other, which can achieve different equilibrium speeds. The first group maintained its global efficiency value, while the second group saw an efficiency decrease of about 8%.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Green & Sustainable Science & Technology
V. B. Murali Krishna, V. Sandeep, S. S. Murthy, Kishore Yadlapati
Summary: This paper presents an experimental comparison of the performance of self-excited induction generator (SEIG) and permanent magnet synchronous generator (PMSG) for standalone renewable energy applications. The study aims to identify the simple, viable, and economical solution for a dedicated power source and fixed isolated loads. The performance analysis is carried out on micro-hydro turbine-driven SEIG and PMSG systems with different load applications and the suitable voltage regulated generator is identified.
Article
Engineering, Multidisciplinary
Saleh Al-Senaidi, Abdulrahman Alolah, Majeed Alkanhal
Summary: This paper presents a steady-state analysis of parallel-operated self-excited induction generators (SEIGs) with different numbers of poles. An equivalent circuit model considering different numbers of poles for each machine is derived. The model is valid for both equal and different numbers of poles. The analysis is experimentally verified and found to be in good agreement with measurements. This study is significant for expanding the application of SEIGs and their integration with renewable energy sources.
ENGINEERING SCIENCE AND TECHNOLOGY-AN INTERNATIONAL JOURNAL-JESTECH
(2022)
Article
Green & Sustainable Science & Technology
Marcos Tostado-Veliz, Mohammad Bayat, Ali Asghar Ghadimi, Francisco Jurado
Summary: This study investigates the use of home energy management systems in off-grid dwellings to flexibly adjust the operation mode of thermostatically controlled appliances to achieve environmental and economic goals such as reducing CO2 emissions and diesel consumption. The results show that energy generated by backup generators can be significantly reduced and other relevant indicators can also be improved by operating thermal-based appliances flexibly.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Green & Sustainable Science & Technology
Jesus Castro Martinez, Jose Luis Rodriguez Amenedo, Santiago Arnaltes Gomez, Jaime Alonso-Martinez
Summary: This paper proposes a novel grid-forming control scheme for doubly-fed induction generators, so they behave as real voltage sources. The proposed control system is based on the orientation of the rotor flux to a reference axis obtained from the emulation of the synchronous generator swing equation. The control system has been validated through real-time simulation with hardware in the loop and small signal analysis to assess system stability.
Article
Engineering, Multidisciplinary
Yupeng Liu, Mohammad A. Masadeh, Pragasen Pillay
Summary: In this article, a power-electronic-converter-based PHIL emulator is developed to investigate the operation of SEIG under unbalanced conditions. The effectiveness of the proposed solution is verified through comparisons with simulation and experimental results.
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
(2022)
Article
Thermodynamics
Xipan Wang, Junnian Song, Jiahao Xing, Haiyan Duan, Xian'en Wang
Summary: This study explores the coupling between water and energy efficiency in Chinese provincial regions and finds that regions generally have better performance in energy efficiency compared to water efficiency. The coupling level between the two factors is high, but the coordination level varies across regions. The economically leading regions in the eastern part of China show a higher coupling level. The study also identifies pathways to improve water and energy efficiency.
Article
Thermodynamics
Mohammad Hassan Shahverdian, Ali Sohani, Hoseyn Sayyaadi
Summary: This study investigates a hybrid system consisting of PV modules, an electrolyzer, and a PEMFC for off-grid electricity production. By optimizing the system parameters, it achieves high energy production and low water footprint, while also proving to be economically viable.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Chemistry, Multidisciplinary
Marian Kampik, Marcin Fice, Andrzej Jurkiewicz
Summary: Cogeneration sources are important in the power industry, especially in utilizing agricultural biogas for electricity generation. The research aims to develop an effective electricity source powered by agricultural biogas, which meets the technical requirements of the Network Codes.
APPLIED SCIENCES-BASEL
(2023)
Article
Environmental Studies
Weiqing Li, Fengsheng Chien, Ching-Chi Hsu, YunQian Zhang, Muhammad Atif Nawaz, Sajid Iqbal, Muhammad Mohsin
Summary: The study explores the relationship between energy poverty and energy efficiency in developed and developing countries through data analysis, highlighting the negative impact of energy poverty on GDP and social welfare, suggesting policy adjustments and emphasis on productive energy supply.
Article
Energy & Fuels
Dominik A. Gorski, Grzegorz Iwanski
Summary: This article presents an analysis of grid connection of an excited induction generator, proposing a method to reduce inrush current and eliminate voltage drop in the local grid. The method involves connecting the generator to the grid when the voltages match but the frequencies differ, and using a power electronic converter for excitation. Experimental results demonstrate the effectiveness of this method in improving grid connection efficiency.
IEEE TRANSACTIONS ON ENERGY CONVERSION
(2021)
Article
Thermodynamics
Mustafa Kiziltan
Summary: Efficient use of water resources plays a crucial role in achieving Turkey's energy efficiency goals. An increase in water consumption leads to a rise in electricity consumption, while urbanization and electricity prices have varying effects on electricity consumption.
Article
Multidisciplinary Sciences
Emilio F. Moran, Maria Claudia Lopez, Rachel Mourao, Erik Brown, Aaron M. McCright, Judith Walgren, Ana Paula Bortoleto, Adam Mayer, Igor Cavallini Johansen, Karina Ninni Ramos, Laura Castro-Diaz, Maria Alejandra Garcia, Rafael Cavalcanti Lembi, Norbert Mueller
Summary: This paper discusses an innovative Convergence Framework that integrates engineering, social sciences, and communication to address energy challenges in off-grid communities. By working together with communities and stakeholders, this Framework promotes clean energy transitions, strengthens emerging industries at the local level, and fosters collaborations between scholars from the Global North and South.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Engineering, Electrical & Electronic
Haris Calgan, Metin Demirtas
Summary: This study presents several optimal controllers for regulating the terminal voltage of a stand-alone self-excited induction generator (SEIG) and introduces a hybrid controller combining LQR and Fractional Order Proportional Integral Derivative (LQR-(FOPID mu)-D-lambda) to achieve the best tracking dynamics and robustness. Experimental results demonstrate that the robust LQR-(FOPID mu)-D-lambda controller outperforms others in terms of tracking dynamics, overshoot, settling time, and robustness against external disturbances and sensor noises.
ELECTRIC POWER SYSTEMS RESEARCH
(2021)
Article
Automation & Control Systems
Shuangqi Li, Pengfei Zhao, Chenghong Gu, Jianwei Li, Shuang Cheng, Minghao Xu
Summary: This article develops a novel online battery anti-aging energy management method using a deep reinforcement learning framework to handle the energy-transportation nexus, achieving optimized power balancing and battery anti-aging control.
IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS
(2022)
Article
Environmental Sciences
Joseph Daniel Pineda Sandoval, Jose Antonio Arciniega-Nevarez, Xitlali Delgado-Galvan, Helena M. Ramos, Modesto Perez-Sanchez, P. Amparo Lopez-Jimenez, Jesus Mora Rodriguez
Summary: This research proposes a methodology that uses multi-objective optimization to place pumps operating as turbines (PATs) to energize street lighting, monitor the water network, and charge small electric vehicles. The methodology selects PATs based on maximizing power recovery, minimizing system pressure, and maximizing recoverable energy. The benefits include reducing emissions, saving fuel and electricity consumption, and providing socio-economic impact. Each PAT can supply street lighting, water network monitoring, and a charging station, with a return on investment of up to 1.07 at 12 years.
Article
Chemistry, Analytical
Mariana Sofia Santos, Ricardo Marques A. Lameirinhas, Joao Paulo N. Torres, Joao F. P. Fernandes, Catarina Correia V. P. Bernardo
Summary: Renewable energy is increasingly important as societies move towards fossil fuel-free world, and solar energy stands out as one of the most abundant green energy sources. In this study, the use of nanoantennas to enhance light absorption in photovoltaic cells is explored, specifically focusing on metallic aperture nanoantennas made of silver, aluminium, gold, or copper. The analysis compares different geometries (rectangular, circular, and triangular) and finds that while the maximum field enhancement is achieved with an aluminium rectangular nanoantenna of 50 nm thickness, the circular geometry with a 100 nm radius presents the most improvement compared to a basic silicon cell.
Article
Energy & Fuels
Andres A. Zuniga, Joao F. P. Fernandes, Paulo J. C. Branco
Summary: Failure modes, effects, and criticality analysis (FMECA) is a widely used qualitative risk analysis method, but it has some analyzed shortcomings. This paper introduces the application of Type-I fuzzy inference systems (FIS) as an alternative to improve the risk level computation in FMECA analysis and applies it to cyber-power grid systems for reliability analysis.
Article
Energy & Fuels
Bernardo Goncalves, Joao F. P. Fernandes, Joao Paulo N. Torres, Ricardo Marques A. Lameirinhas
Summary: Photovoltaic energy has high potential among renewable sources, and the impact of sand on CdTe panels was studied experimentally. It was found that sand had varying negative effects on CdTe panels with different colors and transparencies. A model was developed to predict the effect of sand on these panels based on the experimental results.
Article
Environmental Sciences
Helena M. Ramos, Alban Kuriqi, Mohsen Besharat, Enrico Creaco, Elias Tasca, Oscar E. Coronado-Hernandez, Rodolfo Pienika, Pedro Iglesias-Rey
Summary: One of the main factors contributing to water scarcity is water loss in water distribution systems, which mainly arises from a lack of knowledge in the design process and poor maintenance/management. To improve system efficiency, the current study establishes a smart water grid with a digital twin for monitoring and management. Through a case study in Madeira Island, Portugal, the developed methodology significantly reduces water losses and improves system efficiency, resulting in meaningful economic benefits.
Article
Environmental Sciences
Duban A. Paternina-Verona, Oscar E. Coronado-Hernandez, Hector G. Espinoza-Roman, Vicente S. Fuertes-Miquel, Helena M. Ramos
Summary: This research uses a 3D CFD model to analyze the continuous changes in the shape of an air-water interface during filling operations, with different hydro-pneumatic tank pressures and air pocket sizes as initial conditions. The study focuses on the rapid filling process in a 7.6 m long PVC pipeline with an irregular profile, using OpenFOAM software. The scenarios were validated with experimental measurements and the 3D CFD model proved to be suitable for simulating them. Additionally, a mesh sensitivity analysis was conducted to study air pocket pressure patterns, water velocity oscillations, and the different shapes of the air-water interface.
Article
Green & Sustainable Science & Technology
Elias Tasca, Mohsen Besharat, Helena M. Ramos, Edevar Luvizotto Jr, Bryan Karney
Summary: This paper summarizes the negative impact of entrapped air on the energy consumption and conveyance capacity of water conveyance systems. It identifies common conditions that lead to air accumulations and compares the effects on gravity and pumped lines, showing that gravity lines are more prone to these negative effects. The paper also critically assesses two common strategies for air management: employing air valves or using hydraulic means for air removal.
Article
Crystallography
Antonio J. Arsenio Costa, Joao F. P. Fernandes, Rui Melicio, Carlos Cardeira, Paulo J. Costa J. Branco
Summary: This article presents the results of an experimental study on the heat transfer and LN2 consumption in the process of zero-field cooling (ZFC) of an yttrium barium copper oxide (YBCO) bulk. The thermal power from the YBCO bulk to LN2 is determined by measuring the evaporation rate of LN2. The experimental results are compared with numerical simulations and used to validate the thermal parameters of YBCO, including thermal conductivity and specific heat capacity.
Article
Engineering, Electrical & Electronic
Ines S. P. Peixoto, F. Ferreira da Silva, Joao F. P. Fernandes, Silvio Vaschetto, Paulo J. Costa Branco
Summary: This article focuses on accelerating three 3-D optimization scenarios for bulk superconductor-based electromechanical systems. Distributed equivalent-permeability models for high-temperature-superconducting (HTS) bulks are developed, which replicate the distribution of electromagnetic forces and minimize the need for time-dependent simulations. The models' applicability is demonstrated through the optimization of a 3-D levitation system, and experimental tests validate their accuracy.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Article
Environmental Sciences
Emanuele Quaranta, Helena M. M. Ramos, Ulf Stein
Summary: During the Digital Decade, the EU faces the challenges of green and digital transitions, which are interconnected. These transitions are relevant in various aspects of life, including industry, energy, transportation, environmental management, and daily life. Digital solutions have economic benefits in the water sector, such as reducing leakage, preventing sewer overflows, and improving hydropower generation. The total benefits for the EU and UK are estimated at EUR 5.0 billion, 0.14 billion, and 1.7 billion per year, respectively.
Article
Chemistry, Multidisciplinary
Duban A. Paternina-Verona, Oscar E. Coronado-Hernandez, Hector G. Espinoza-Roman, Vicente S. Fuertes-Miquel, Helena M. Ramos
Summary: In hydraulic engineering, researchers have developed mathematical and numerical tools to understand the interaction between water flow and trapped air in pipes during emptying processes. They compared experimental and numerical models and found that mathematical models offered relevant information in a short simulation time, while CFD models provided detailed visualization of complex phenomena but required longer simulation times.
APPLIED SCIENCES-BASEL
(2023)
Article
Water Resources
Andres F. Villalba-Barrios, Oscar E. Coronado-Hernandez, Vicente S. Fuertes-Miquel, Jairo R. Coronado-Hernandez, Helena M. Ramos
Summary: This research presents a new methodology to calculate base flow rates in gauged rivers for extreme events based on statistical correlations of daily flows. Estimating base flow rates in storm hydrographs associated with different return periods is challenging, but this methodology avoids the need for complex aquifers analysis. Computed base flow rates were validated using observed storm hydrographs, and the analysis confirmed the effectiveness of using multiannual monthly mean flows to estimate base flow for flood hydrographs with different return periods.
Article
Physics, Fluids & Plasmas
Alfredo M. Abuchar-Curi, Oscar E. Coronado-Hernandez, Jairo Useche, Veronica J. Abuchar-Soto, Argemiro Palencia-Diaz, Duban A. Paternina-Verona, Helena M. Ramos
Summary: This study conducted an experimental and numerical analysis of impeller blades in centrifugal pumps, revealing that double curvature impellers can enhance pump performance.
Article
Environmental Sciences
Elias Tasca, Mohsen Besharat, Helena M. Ramos, Edevar Luvizotto Jr, Bryan Karney
Summary: This study provides a comprehensive sensitivity analysis of the transient behavior in a rising water pipeline with an air valve. The paper examines the stages of water hammer associated with a pump trip and investigates the relationship between the transient magnitude and air valve outflow capacity. The study finds that the relationship is nonlinear and roughly follows a logistic curve shape.
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)
