Article
Thermodynamics
Junhui Meng, Nuo Ma, Fanmin Meng, Xiaohui Zhang, Li Liu
Summary: This paper studies a hybrid energy system for a multi-lobes hybrid air vehicle (HAV), which uses solar cells, fuel cells, and lithium batteries as energy sources. By establishing a rule-based power-following management strategy, different energy subsystems can be better managed to achieve optimal flight performance for HAV.
Article
Energy & Fuels
Ali Saleh Aziz, Mohammad Faridun Naim Tajuddin, Tekai Eddine Khalil Zidane, Chun-Lien Su, Ali Jawad Kadhim Alrubaie, Mohammed J. Alwazzan
Summary: The selection of an appropriate dispatch strategy is crucial in designing a hybrid energy system (HES) due to its significant impact on stability, reliability, environmental, and economic performance. This paper investigates the optimal design of an off-grid PV/diesel/battery HES for rural electrification in Iraq. A new dispatch strategy is developed with a 12-hour foresight using MATLAB Link module. The proposed strategy outperforms the default cycle charging (CC) strategy in terms of technical, economic, and environmental performance, with lower NPC, higher renewable fraction, and reduced CO2 emissions.
Article
Thermodynamics
Ali Saleh Aziz, Mohammad Faridun Naim Tajuddin, Moaid K. Hussain, Mohd Rafi Adzman, Nur Hafizah Ghazali, Makbul A. M. Ramli, Tekai Eddine Khalil Zidane
Summary: A new dispatch strategy based on the HOMER-MATLAB Link Controller is proposed to overcome the limitations of the default HOMER strategies. The results show that the proposed strategy offers the best economic and environmental performance.
Article
Thermodynamics
Dongqi Zhao, Zhiping Xia, Meiting Guo, Qijiao He, Qidong Xu, Xi Li, Meng Ni
Summary: This study introduces proton exchange membrane electrolyzer cells into microgrids for storing renewable energy in a more stable form of hydrogen energy. It proposes a capacity optimization method to ensure that the distributed energy capacity meets user demands, even under impoverished meteorological conditions. An artificial neural network is used to determine the optimal efficiency and operating conditions of the electrolyzer for efficient hydrogen production. A multi-objective energy dispatch strategy is designed considering both low-cost and long-life operations. The study shows that this strategy reduces the volatility and required capacity of the electrolyzer while increasing the average daily dispatching cost by a small amount.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Engineering, Electrical & Electronic
Yuyan Liu, Zhongping Yang, Xiaobo Wu, Donglei Sha, Fei Lin, Xiaochun Fang
Summary: This article proposes an adaptive energy management framework for stationary energy storage systems (ESS) using a battery-supercapacitor hybrid ESS. The advantages of this stationary hybrid ESS are demonstrated through an example. The proposed power distribution strategy solves the adaptability issue of two energy storage media to the load variation of rail transportation power systems, delaying battery degradation. Simulation and experimental results show that the proposed energy management strategy outperforms conventional strategies in terms of energy conservation rate, voltage stabilization rate, and battery current.
IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION
(2022)
Article
Energy & Fuels
Yijie Zhang, Qimeng Xue, Diju Gao, Weifeng Shi, Wanneng Yu
Summary: Compared with ground power systems, the intermittent and random fluctuation of ship load power demand poses challenges to the energy management system of ship power systems. To address this issue, a hybrid energy storage system and a two-level model predictive control strategy are proposed to optimize fuel economy and power distribution.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Computer Science, Interdisciplinary Applications
Hassan Abouobaida, Lais de Oliveira-Assis, Emanuel P. P. Soares-Ramos, Hassane Mahmoudi, Josep M. Guerrero, Mohsin Jamil
Summary: In this paper, a method of energy management shared with storage devices in a standalone DC microgrid is proposed. The management aims to satisfy energy demand while ensuring good regulation and stability of DC bus voltage. The method takes into account losses in static converters by calculating the effective power available on the common DC bus. The control strategy combines fuzzy logic control for extracting maximum power from photovoltaic and wind sources, and sliding mode control for controlling storage power converters. The simulation results demonstrate the validity of the proposed energy management and control strategy.
SIMULATION MODELLING PRACTICE AND THEORY
(2023)
Article
Energy & Fuels
Mostafa Bakhtvar, Amer Al-Hinai
Summary: This paper proposes a robust optimal scheduling tool based on a rolling approach to ensure optimal operation of BESS within DHRB in the worst price scenarios. By limiting the use of BESS to extend its lifetime, more income can potentially be generated in the long term.
Article
Energy & Fuels
Kaifeng Wang, Lin Ye, Shihui Yang, Zhanfeng Deng, Jieying Song, Zhuo Li, Yongning Zhao
Summary: This paper proposes a hierarchical dispatch strategy assisted by model predictive control for the UPS in IDC, aiming to enhance power system stability and increase UPS utilization. The strategy involves available energy analysis, upper-level power system dispatch, and lower-level IDC dispatch. The numerical results show that the proposed strategy significantly improves UPS utilization by 85%, increases revenue by yen 5950, and reduces SOC fluctuation to 12%-19%.
Article
Energy & Fuels
Haroune Aouzellag, Bessam Amrouche, Koussaila Iffouzar, Djamal Aouzellag
Summary: This paper proposes an energy management strategy based on hysteresis control, using the expression of the energy storage system converter efficiency as the sole input variable. Simulation results show that the strategy allows energy distribution and reduces energy consumption.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Engineering, Chemical
Moussa Gaptia Lawan, Mamadou Bailo Camara, Abdulkareem Shaheed Sabr, Brayima Dakyo, Ahmed Al Ameri
Summary: This paper presents a simulation of an insulated micro-grid system based on the three-level converters control for energy management. Different renewable power sources, battery energy storage system (BESS), and a variable diesel generator are used in the system. The research focuses on improving energy transfer quality, dynamic interactions, and maximizing energy production from renewable sources.
Article
Energy & Fuels
Shuang Chen, Minghui Hu, Yanlei Lei, Linghao Kong
Summary: In this study, a multimode hybrid locomotive configuration scheme is designed to improve efficiency and reduce fuel consumption. An energy management strategy based on optimal system efficiency and with a hierarchical architecture is proposed. Simulation results show that the proposed strategy improves fuel economy by 27.22% compared to traditional locomotives.
Article
Thermodynamics
Qian Ma, Xiang Huang, Feng Wang, Chao Xu, Reza Babaei, Hossein Ahmadian
Summary: This paper presents a sustainable framework and techno-feasibility evaluation of stand-alone hybrid power options for electrification in Persian Gulf Islands. It explores new patterns in renewable behavior using cycle charging and load following strategies, with the optimal solution found to be the integration of various renewable energy components on Lavan Island.
Article
Energy & Fuels
Pawan Kumar Kushwaha, Chayan Bhattacharjee
Summary: A hybrid renewable energy system (HRES) with consideration of TEES factors for domestic load and telecommunication load in India is developed in this study. Comparative study of different dispatch strategies using HOMER software shows that HRES with a predictive dispatch strategy outperforms other strategies, providing the lowest energy cost and optimal TEES parameters.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Green & Sustainable Science & Technology
Joshi Sukhdev Nirbheram, Aeidapu Mahesh, Ambati Bhimaraju
Summary: In this paper, a novel hybrid demand response program (DRP) and energy management strategy (EMS) are proposed to improve the efficiency of power systems. The hybrid DRP combines time-of-use and incentive-based methods, while the EMS utilizes variations in grid tariff to charge the energy storage system at low cost. The results of a case study show that the hybrid DRP reduces peak demand and energy cost, and the EMS further decreases the cost.
Article
Automation & Control Systems
Zhou Wu, Qian Li, Xiaohua Xia
Summary: This article investigates multi-timescale solar irradiance forecast using a multi-task learning mechanism, proposing a new MTS prediction framework and MTS-ESN model. Simulation results show that MTS-ESN achieves promising performance at both hourly and daily levels, outperforming the single-timescale ESN model.
IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS
(2021)
Article
Chemistry, Physical
Farshad Barzegar, Vladimir Pavlenko, Muhammad Zahid, Abdulhakeem Bello, Xiaohua Xia, Ncholu Manyala, Kenneth Ozoemena, Qamar Abbas
Summary: Controlling the porosity of carbon-based electrodes is crucial for enhancing the performance of charge storage devices such as supercapacitors. This study demonstrates an eco-friendly method for preparing carbon materials with optimized pore structures, leading to improved surface characteristics and interconnected porous structure suitable for ionic transport. The composite materials show stable capacitance and energy efficiency, making them promising for use in supercapacitors.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Green & Sustainable Science & Technology
Stanley Semelane, Nnamdi Nwulu, Njabulo Kambule, Henerica Tazvinga
Summary: South Africa has developed successful renewable energy projects, but the localisation of solar PV manufacturing has fallen behind. The study shows that without subsidies, local manufacturing of solar panels is not economically feasible; however, it can play a significant role in a just energy transition in regions phasing out coal economies.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2021)
Article
Energy & Fuels
Brighton Mabasa, Meena D. Lysko, Henerica Tazvinga, Nosipho Zwane, Sabata J. Moloi
Summary: This study evaluated the performance of six global horizontal irradiance (GHI) clear sky models in South Africa, with the Bird model being identified as the overall best performer across different climatic regions. The Bird model can be used with quantitative confidence for solar energy applications when all required inputs are available.
Article
Energy & Fuels
Stanley Semelane, Nnamdi Nwulu, Njabulo Kambule, Henerica Tazvinga
Summary: The localization of solar PV panels can stimulate regional economic development in coal phase-out regions. By optimizing LCRs, a positive influence on employment and GDP under the considered timeframes (2020-2030) was determined. Specifically, a 100% LCRs scenario is projected to create 249,315 Full-Time-Equivalent (FTE) jobs over 10 years.
ENERGY SOURCES PART B-ECONOMICS PLANNING AND POLICY
(2021)
Article
Automation & Control Systems
Yanjin Li, Hui Yu, Xiaohua Xia
Summary: In this study, the output feedback H infinity consensus control problem of multi-agent systems is addressed using an event-triggered control strategy. An interval dividing approach is applied to update the entire system in the same time intervals, and an event-triggered OFC with H infinity performance is proposed. Theoretical results are validated through computer simulation to demonstrate the effectiveness of achieving consensus in multi-agent systems.
IET CONTROL THEORY AND APPLICATIONS
(2021)
Article
Green & Sustainable Science & Technology
Lijun Zhang, Ambrose Njepu, Xiaohua Xia
Summary: This paper introduces an integrated rainwater harvesting and greywater recycling system to address the issue of unreliable water and electricity supply in residences. By using a mixed integer linear programming model, optimal sizes of water tanks and operation of pumps were determined to reduce potable water consumption and electricity cost. The system was applied to a practical case study in South Africa, showing significant water and financial savings with an acceptable payback period.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Energy & Fuels
Dong Lin, Lijun Zhang, Xiaohua Xia
Summary: This study examines four optimization strategies to improve the efficiency of greenhouse systems, with Strategy 4 showing the most significant reduction in total costs. Changes in electricity prices have a greater impact on optimization results, and temperature and humidity constraints also play an important role. The designed controller is proven to be effective in rejecting disturbances and addressing model plant mismatch.
Article
Engineering, Multidisciplinary
Conrad Sanama, Xiaohua Xia
Summary: The study presents a detailed modelling technique for predicting refrigerant conditions in a VC system, addressing the issue of transient state modelling by introducing a method developed from conservation equations represented with Navier-Stokes equations. Model validation with experiments shows the potential for predicting optimal performance parameters in VC systems.
MATHEMATICAL PROBLEMS IN ENGINEERING
(2021)
Article
Computer Science, Artificial Intelligence
Kailu Sun, Hui Yu, Xiaohua Xia
Summary: This paper discusses the distributed event-triggered control problems for nonlinear stochastic multi-agent systems with external disturbance and time-delay, establishing criteria for leader-following consensus in networks containing a directed spanning tree. By designing appropriate Lyapunov-Krasovskii function, sufficient conditions for achieving consensus are obtained, and the control gain matrix is designed accordingly to realize the controller. Lower bounds of interexecution times are provided to prevent Zeno-behavior, and the theoretical analyses are verified through simulation.
Article
Urban Studies
Luxon Nhamo, Lameck Rwizi, Sylvester Mpandeli, Joel Botai, James Magidi, Henerica Tazvinga, Nafiisa Sobratee, Stanley Liphadzi, Dhesigen Naidoo, Albert T. Modi, Rob Slotow, Tafadzwanashe Mabhaudhi
Summary: The rapid urbanisation of the Gauteng City-Region in South Africa poses challenges related to land use management, service delivery, and social cohesion. Issues such as massive impervious surfaces, rising temperatures, flooding, and heatwaves exacerbate the challenges associated with rapid urbanisation. Innovative strategies are needed to transform the urbanised province into a climate action and adaptation centre.
Article
Engineering, Environmental
Danny M. Bajany, Lijun Zhang, Yongxin Xu, Xiaohua Xia
Summary: This paper aims to develop an optimal operational strategy in arid/semiarid regions for water decision-makers to control artificial recharge, improve energy efficiency, determine water supply amounts, and minimize costs. The developed model effectively manages aquifer recharge, optimally schedules water source use, and improves water and energy security in urban areas.
ENVIRONMENTAL PROCESSES-AN INTERNATIONAL JOURNAL
(2021)
Article
Energy & Fuels
Tawanda Kunatsa, Xiaohua Xia
Summary: This study introduced a novel methane-optimised biogas-liquid petroleum gas hybrid system, which increased the methane component of biogas by optimizing substrate mass and successfully filled the gap in gas demand.
Review
Energy & Fuels
Nosipho Zwane, Henerica Tazvinga, Christina Botai, Miriam Murambadoro, Joel Botai, Jaco de Wit, Brighton Mabasa, Siphamandla Daniel, Tafadzwanashe Mabhaudhi
Summary: Solar energy forecasting research in Africa and southern Africa has seen steady growth over the past two decades, with South Africa leading in terms of research output. The emerging themes in this research include solar irradiance, artificial intelligence, and clear sky. This study contributes to the development of renewable energy projects and supports the transition to solar energy in Africa, as well as the pursuit of Sustainable Development Goals.
Article
Energy & Fuels
Tawanda Kunatsa, Lijun Zhang, Xiaohua Xia
Summary: Modelling and optimisation of biogas production from different substrate mixtures is currently lacking in research and development. This study presents a model for determining and optimising the co-digestion mix ratios of water hyacinth, municipal solid waste, and cow dung, leading to an increase in biogas output. The results demonstrate the importance of informed optimal co-digestion models in the biogas industry.
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)
