Energies  

Luis Coelho, Maria K. Koukou, John Konstantaras, Michail Gr. Vrachopoulos, Amandio Rebola, Anastasia Benou, Constantine Karytsas, Pavlos Tourou, Constantinos Sourkounis, Heiko Gaich and Johan Goldbrunner

In the present work, the operating results from an innovative, renewable, energy-based space-heating and domestic hot water (DHW) system are shown. The system used solar thermal energy as its primary source and was assisted by a shallow geothermal applica... see more

Xiangyang Chen, Xianglong Luo, Chao Wang, Yingzong Liang, Jianyong Chen, Zhi Yang, Jiacheng He and Ying Chen

Although a large channel-to-rib width ratio (CRWR) of the bipolar plate (BP) leads to a large electrical performance of PEMFC, an excessive CRWR leads to excessive pressure and destroys the gas diffusion layer (GDL), thus reducing the electrical performan... see more

Weihui Xu, Qinbao Wang, Juan Zhen, Weishu Wang, Yan Peng, Boyan Tian, Yushuai Ruan and Renjie Li

In order to explore the law of gas–solid countercurrent cooling heat transfer in a vertical sinter cooling furnace at a high temperature, based on the Euler model and the local non-thermodynamic equilibrium theory, an exergy efficiency model was built to ... see more

Xiaojie Gao, Qilin Xiao, Zhushi Ge, Suyang Cai, Haizhu Zhang, Xiang Wang, Zhenping Xu, Zhanghu Wang, Xiaomin Xie and Qiang Meng

Molecular and stable carbon isotopic compositions of 32 crude oils from the Kekeya area of the Southwest Depression, Tarim Basin, were analyzed comprehensively to clarify oil groups and trace oil sources. The results indicate that lacustrine shale sequenc... see more

Min-Gu Lee, Jong-Bin Kim, Kwang-Jae Park, Ju-Won Song, Ye-Jung Kim and Jae-Eon Kim

The introduction of distributed generation (DG) into distribution systems is expanding due to carbon neutral policies. DG with intermittent output characteristics brings frequent voltage variations in distribution systems. Generally, a step voltage regula... see more

Erdal Sehirli

The main contribution of the paper concerns the use of an LCL trap filter with a PFC isolated Cuk converter. Further, SiC MOSFET is used with a PFC isolated Cuk converter designed for 50 W with 42 kHz in DCM. A small-signal model of the converter is casca... see more

Marcel García, Jose Aguilar and María D. R-Moreno

Distributed energy resources have demonstrated their potential to mitigate the limitations of large, centralized generation systems. This is achieved through the geographical distribution of generation sources that capitalize on the potential of their res... see more

Peng Zhao, Bei Si Tian, Qi Yang and Shuai Zhang

Based on the panel data of China’s 284 prefecture-level cities from 2006 to 2020, this study employs spatial econometric and geographically weighted regression models to systematically analyze the influencing factors and their spatial–temporal heterogenei... see more

Yan Huang and Lin Feng

The popularization of electricity-gas systems leads to increasing demand for state management of systems. However, the existence of neglected measurement correlations brings uncertainties to the electricity-gas systems state estimation. In this paper, an ... see more

Hongrui Liu, Xiangyang Wei, Junjie Ai and Xudong Yang

An effective equaliser is crucial for eliminating inconsistencies in the connected serial batteries and extending the life of the battery system. The current equalisers generally have the problems of low equalisation efficiency, slow equalisation speed, a... see more

Christian Santoni, Fotis Sotiropoulos and Ali Khosronejad

This study compared the efficacy of the actuator line and actuator surface models in carrying out large-eddy simulations of a utility-scale wind turbine. A large-eddy simulation with the actuator surface and line models was employed to study the wake flow... see more

Roman Lepikash, Daria Lavrova, Devard Stom, Valery Meshalkin, Olga Ponamoreva and Sergey Alferov

Environmental pollution is becoming ubiquitous; it has a negative impact on ecosystem diversity and worsens the quality of human life. This review discusses the possibility of applying the plant microbial fuel cells (PMFCs) technology for concurrent proce... see more

Daniel Mammarella, Andrea Di Giuliano and Katia Gallucci

Digestate is produced in large quantities by the anaerobic digestion process, which is recognized to be a promising technology for producing bioenergy from biological waste. Digestate is a highly humid by-product containing organic and inorganic substance... see more

Chaoqun Fan and Ahmed Usman

Policymakers are looking at renewable energy as a substitute for traditional fossil fuels due to the growing concern about climate change and sustainable development. However, in the case of Asian countries, nothing is known about how ICT trade and financ... see more

Meraa Arab and Waleed Fadel

In this paper, it is proposed that a two-terminal high voltage direct current (HVDC) be integrated into the power system. Line-commutated converter (LCC)-HVDC is used because of its ability to reduce line losses, which improves overall system efficiency. ... see more

Haojie Chen, Min Zhang and Taohua He

Ma2 and Ma3 hydrocarbon source rock samples from the Fengcheng Formation in well Maye 1, Mahu Depression, Junggar Basin, were studied using conventional geochemical analysis methods and saturated hydrocarbon gas chromatography–mass spectrometry. The distr... see more

Evgeniy Kirichenko, Ksenia Kirichenko and Anna Kirichenko

The transition to renewable energy is strongly affected by legal regulation. To increase the efficiency of the introduction of renewable energy into the energy systems of component states of federations and accelerate the energy transition, it is necessar... see more

Lijia Fang, Hardeep Singh, Takuma Ohashi, Masato Sanno, Guansen Lin, Emir Yilmaz, Mitsuhisa Ichiyanagi and Takashi Suzuki

Road vehicles, particularly cars, are one of the primary sources of CO2 emissions in the transport sector. Shifting to unconventional energy sources such as solar and wind power may reduce their carbon footprints considerably. Consequently, using ammonia ... see more

Lukasz Brodzik

Research on engine operation using hydrogen may enable appropriate optimization of thrust, and therefore performance, related to its potential use in aircraft. It is particularly important as the share of hydrogen in combustion affects the reduction of co... see more

Shudong Leng, Yefeng Cai, Haisheng Zhao, Xin Li and Jiafei Zhao

Floating offshore wind turbines (FOWTs) may experience six degree of freedom (DoF) movements under the influence of environmental conditions. Different combinations of platform movements with the same amplitude and frequency may have distinct influences o... see more

Heejung Park

As the need for energy storage systems (ESSs) capacity is increasing due to high accommodation of renewable resources, it is crucial to analyze in which location and for what purpose the ESSs are required to achieve the highest efficiency. Investors and s... see more

Lei Tao, Longlong Wang, Jiajia Bai, Na Zhang, Wenyang Shi, Qingjie Zhu, Zhengxiao Xu and Guoqing Wang

As conventional oil reservoirs are gradually being depleted, researchers worldwide are progressively shifting their focus towards the development and comprehensive study of tight oil reservoirs. Considering that hydraulic fracturing is one of the main app... see more

Cristina Carletti, Cristina Piselli and Fabio Sciurpi

As buildings are one of the major contributors to greenhouse gas emissions and energy consumption, they have a key potential for energy efficiency and indoor environmental quality improvement. Therefore, the development of nearly Zero-Energy Buildings (nZ... see more

Yang Wang, Sajib Chakraborty, Thomas Geury and Omar Hegazy

Modular multilevel converters (MMCs) with integrated battery energy storage systems (BESSs) are becoming crucial for modern power grids. This paper investigates the modeling and control of a grid-connected MMC-BESS, with a specific emphasis on state-of-ch... see more

Radoslaw Wisniewski, Aneta Nowakowska-Krystman, Tomasz Kownacki and Piotr Daniluk

Research pertaining to the dual-tier political system within the European Union (EU), specifically concerning the genesis and execution of EU policies, has garnered substantial scholarly attention. These inquiries delve into multifaceted dimensions, encom... see more

Michela Costa and Daniele Piazzullo

Syngas from biomass gasification represents an interesting alternative to traditional fuels in spark-ignition (SI) internal combustion engines (ICEs). The presence of inert species in the syngas (H2O, CO2, N2) reduces the amount of primary energy that can... see more

Di Lu, Yonggang Peng and Jing Sun

To operate the grid-connected renewable energy system economically, this study presents a dual-stage optimization scheduling model for grid-connected systems with hybrid energy storage, including day-ahead and intra-days stages. In the day-ahead stage, an... see more

Rashinda Wijethunga, Hooman Nouraei, Craig Zych, Jagath Samarabandu and Ayan Sadhu

Supermarket refrigeration systems are integral to food security and the global economy. Their massive scale, characterized by numerous evaporators, remote condensers, miles of intricate piping, and high working pressure, frequently leads to problematic le... see more

Ekua Afrakoma Armoo, Mutala Mohammed, Satyanarayana Narra, Essossinam Beguedou, Francis Boateng Agyenim and Francis Kemausuor

In developing countries like Ghana, the conversion of waste into energy is gaining greater interest among policy makers and researchers. The present study investigates the feasibility of producing electricity and/or fuels from a hybrid waste-to-energy pil... see more

Sultan Alqahtani, Kevin M. Gitushi and Tarek Echekki

The oxidation of complex hydrocarbons is a computationally expensive process involving detailed mechanisms with hundreds of chemical species and thousands of reactions. For low-temperature oxidation, an accurate account of the fuel-specific species is req... see more

Vali Rasooli Sharabiani, Reza Akbari, Seyed Ali Mousavi, Mohammad Tahmasebi, Mariusz Szymanek and Jacek Dziwulski

Fereydounshahr experiences growing electricity shortfalls and an overreliance on polluting diesel generators. This analysis models renewable hybrid systems to electrify a local dairy operation using HOMER Pro 3.11 software. Despite higher upfront costs, a... see more

Chanaka Galpaya, Ashan Induranga, Vimukthi Vithanage, Prasanga Mantilaka and Kaveenga Rasika Koswattage

The efficiency, durability, and overall performance of a car engine are influenced by several critical factors. The quality and properties of engine oil play a crucial role, and oil is used in internal combustion engines for lubrication and cooling purpos... see more

Haoqi Zhu, Mustafa Tahir, Xu Wu and Sideng Hu

Wireless power and data transmission (WPDT) solutions for medical implants are highly desired. However, achieving a high-power transmission efficiency and data rate simultaneously over an inductive link remains a significant challenge. This paper presents... see more

Teng Teng, Xin Zhang, Qicheng Xue and Baodi Zhang

In this study, a concentration overvoltage model that focuses on describing variable-temperature operating condition properties for PEMFCs is established. Sensitivity analysis and a quantification study of oxygen transport resistance are carried out based... see more

Giuliano Agati, Domenico Borello, Michele Vincenzo Migliarese Caputi, Luca Cedola, Gabriele Guglielmo Gagliardi, Adriano Pozzessere and Paolo Venturini

The study utilizes open-access data to generate power demand curves for a hybrid automotive system, testing twelve configurations with three different energy management strategies and four values for the degree of hybridization (DOH), the latter represent... see more

Tiruwork B. Tibebu, Eric Hittinger, Qing Miao and Eric Williams

Understanding the adoption patterns of clean energy is crucial for designing government subsidies that promote the use of these technologies. Existing work has examined a variety of adoption models to explain and predict how economic factors and other tec... see more

Kyung-Chul Cho, Ki-Yeol Shin, Jaesool Shim, San-Su Bae and Oh-Dae Kwon

To achieve carbon neutrality and address global energy supply issues by 2050, there is active progress in the industrial sector for waste energy recovery and commercialization projects. It is necessary to consider both the energy recovery efficiency and e... see more

Alessandro Bessi, Mariangela Guidolin and Piero Manfredi

The National Energy and Climate Plans (NECPs) of the EU Member States have established comprehensive goals for 2030 to speed up the process of energy transition. Though Italy was an innovator in the area of photovoltaics (PV) up until 2014, the subsequent... see more

Liangnian Lv, Ziming Hu, Sisi Li, Rui Guo, Jinpeng Wang, Gaolin Wang and Shulin Li

There are usually noise problems when the position sensorless control of a synchronous reluctance motor (SynRM) is carried out by high-frequency (HF) signal injection method. Due to the special structure, the cross-saturation effect of the SynRM is partic... see more

Sixiang Zhang, Longyuan Li, Weijun Liu, Daijun Luo, Bingjie Zhai, Haomin He, Peng Zou, Yuhong Wang and Shilin Gao

Aiming at the problem of ultra-low-frequency oscillation (ULFO) caused by an irrational setting of governor parameters of high-head hydraulic turbine units, this paper proposes a method to optimize the additional damping control parameters of the governor... see more

Yifeng Wang, Weibing Shen, Jian Li, Chen Zhang, Hongzhe Xie, Shuo Chen, Quzong Baima and Chunhong Wang

The distribution characteristics and main controlling factors of hydrocarbon phases in deep strata from petroliferous basins are important for the evaluation of oil–gas resources and decision-making regarding exploration. The distribution characteristics ... see more

Pascal M. Lingom, Joseph Song-Manguelle, Jean Maurice Nyobe-Yome and Mamadou L. Doumbia

A cascaded H-bridge multilevel converter topology is the ultimate solution for energy conversion in various industrial applications due to its exceptional features, such as high modularity and fault-tolerant capability. However, two circumstances can lead... see more

Aïssatou Mboup, Atsushi Akisawa, Ramón Pujol-Nadal and Víctor Martínez-Moll

The compound parabolic concentrator (CPC) is a core technology in the field of solar concentration. Nevertheless, it only has one degree of freedom in the choice of its half-acceptance angle. In this study, extending the idea of the three-dimensional CPC,... see more

Julian Koch, Astrid Bensmann, Christoph Eckert, Michael Rath and Richard Hanke-Rauschenbach

Forecasts and their corresponding optimized operation plans for energy plants never match perfectly, especially if they have a horizon of several days. In this paper, we suggest a concept to cope with uncertain load forecasts by reserving a share of the e... see more

Muhammad Baqir Hashmi, Mohammad Mansouri, Amare Desalegn Fentaye, Shazaib Ahsan and Konstantinos Kyprianidis

The utilization of hydrogen fuel in gas turbines brings significant changes to the thermophysical properties of flue gas, including higher specific heat capacities and an enhanced steam content. Therefore, hydrogen-fueled gas turbines are susceptible to h... see more

Michal Patyk and Przemyslaw Bodziony

The outlined methodology for calculating operating costs in open-cast mines and quarries not only facilitates the selection of optimal mining equipment and systems for working lower-grade secondary deposits but also adds significant value in navigating th... see more

Minghang Mao, Kefeng Yan, Xiaosen Li, Zhaoyang Chen, Yi Wang, Jingchun Feng and Chang Chen

As a typical unconventional energy reservoir, natural gas hydrate is believed to be the most promising alternative for conventional resources in future energy patterns. The exploitation process of natural gas hydrate comprises a hydrate phase state, heat ... see more

Geovani Teca and Marek Natkaniec

A smart grid constitutes an electrical infrastructure that integrates communication technologies to optimize electricity production, distribution, and consumption. Within the smart grid, IEEE 802.11 networks play a crucial role in facilitating communicati... see more

Mohammad Javad Bordbari and Fuzhan Nasiri

The increasing impact of climate change and rising occurrences of natural disasters pose substantial threats to power systems. Strengthening resilience against these low-probability, high-impact events is crucial. The proposition of reconfiguring traditio... see more

Piotr Boguslaw Jasinski

The article presents the results of numerical studies of heat transfer and pressure drops in a channel with transverse micro-fins. The main aim of the study was to prepare the thermal and flow characteristics of such a channel for a variable longitudinal ... see more

Tarek Ibrahim, Mohamad Abou Akrouch, Farouk Hachem, Mohamad Ramadan, Haitham S. Ramadan and Mahmoud Khaled

Photovoltaic panels play a pivotal role in the renewable energy sector, serving as a crucial component for generating environmentally friendly electricity from sunlight. However, a persistent challenge lies in the adverse effects of rising temperatures re... see more

Ruizhe Ran, Jing Wang, Fusheng Yang and Rahmatjan Imin

The purpose of this work is to present a convenient design approach for metal hydride reactors that meet the specific requirements for hydrogen storage. Three methods from the literature, the time scale, the acceptable envelope, and the reaction front, ar... see more

Reza Saeed Kandezy, John Jiang and Di Wu

The complexity of modern power grids, caused by integrating renewable energy sources, especially inverter-based resources, presents a significant challenge to grid operation and planning, since linear models are unable to capture the complex nonlinear dyn... see more

Ninghong Jia, Chenyutong Wu, Chang He, Weifeng Lv, Zemin Ji and Lanchang Xing

Cross-borehole electrical resistivity tomography (CHERT) technology has been implemented in field-scale CCS/CCUS (carbon capture and storage/carbon capture, utilization and storage) projects. It is highly desirable to investigate how to optimize the desig... see more

Natalia Szymlet, Lukasz Rymaniak and Beata Kurc

The subject of the article was the chemical analysis of gasoline and exhaust gas samples taken from an urban two-wheeled vehicle. The main aim of the work was to identify chemical compounds emitted by a group of urban two-wheeled vehicles depending on the... see more

Jun Yu, Zhijian Zhang, Weifeng Ren, Dongxing Yang, Dian Wu, Zhiqiang Ning, Chunhua Fang and Junxiong Wu

This study focuses on the semiconductive silicone rubber of 10 kV cold-shrink accessories. Accelerated thermal aging tests were conducted on the semiconductive silicone rubber, obtaining tensile stress–strain curves at various time points after thermal ag... see more

Paola Clerici Maestosi, Monica Salvia, Filomena Pietrapertosa, Federica Romagnoli and Michela Pirro

The positive energy district (PED) is a rather recent concept that aims to contribute to the main objectives of the Energy Union strategy. It is based on an integrated multi-sectoral approach in response to Europe’s most complex challenges. But to what ex... see more

Rafal Figaj

Reduction or elimination of reliance on traditional fossil fuels and of the emission of greenhouse gases and pollutants into the environment are affecting energy technologies, systems, and applications. In this context, one potential approach to achieving... see more

Muhammad Ikhwanus and Takeshi Morimoto

The air discharge phenomenon, characterized by its rapid and transient nature, is inherently unpredictable, emphasizing the need for a comprehensive understanding of its physical interactions. Our experimental setup involved voltage generators producing b... see more

Yuchen Zhang, Zhenquan Zhang, Jun Wang, Jian Qin, Shuting Huang, Gang Xue and Yanjun Liu

Wave energy generation methods have significant energy costs. The implementation of sophisticated control techniques in wave energy generators can lower the cost of power generation by optimizing the energy recovered from wave energy converters (WECs). To... see more