Article
Thermodynamics
Mohd Asjad Siddiqui, Abdul Khaliq, Rajesh Kumar
Summary: A novel combined power and cooling cycle involving ERC and ORC was proposed to enhance the efficiency of a wet-ethanol fuelled HCCI engine. Simulation and analysis showed improved performance under certain operating conditions with different working fluids.
Article
Thermodynamics
Juan Zapata-Mina, Seyed Mohammad Safieddin Ardebili, Alvaro Restrepo, Hamit Solmaz, Alper Calam, Ozer Can
Summary: This study investigates the performance of an HCCI engine operated with various fuel ratios and lambda values. The results show that the highest engine efficiency is achieved when using a blend of 40% diethyl ether and 60% fusel oil (D40F60) at a lambda between 2.1 and 2.2. However, increasing the amount of diethyl ether in the blend decreases the performance of the HCCI engine. Operating with a blend of 80% diethyl ether and 20% fusel oil (D80F20) also provides better stability of performance.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Engineering, Multidisciplinary
Y. Chandrasekharyadav, D. V. Sreekanth, Saurav Das
Summary: Automobile pollution is a global issue that needs urgent attention. Research is being conducted to find ways to reduce pollution, particularly by improving the combustion process of engines to reduce emissions. Simulation software is being used to simulate working conditions and understand the flow physics during combustion.
JOURNAL OF ENGINEERING RESEARCH
(2022)
Article
Thermodynamics
Aneesh Vijay Kale, Anand Krishnasamy
Summary: Reactivity controlled compression ignition (RCCI) and homogeneous charge compression ignition (HCCI) are alternative combustion strategies to improve diesel engine performance and reduce emissions. This study focused on using low reactivity, high volatile methanol-gasoline blends in HCCI engines and found that varying fuel composition is more effective than varying exhaust gas recirculation rate in improving efficiency and reducing emissions. Additionally, HCCI outperformed RCCI at mid to higher loads.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Chemistry, Physical
Mohit Raj Saxena, Rakesh Kumar Maurya
Summary: This study investigates the syngas fuelled homogeneous charge compression ignition (HCCI) engine through parametric investigation. The chemical kinetic simulation using the stochastic reactor model (SRM) compares and evaluates different reaction mechanisms. The validated reaction mechanism is further used to study the HCCI engine at different engine speeds, equivalence ratios, syngas compositions, and inlet valve closing temperatures.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Energy & Fuels
Peixin Zhao, Xiuxiu Sun, Xingyu Liang, Guoxi Jing, Teng Ma
Summary: A multi-component surrogate fuel was developed as an alternative to heavy fuel oil, with proportions determined based on the chemical and physical characteristics. The surrogate fuel was extensively validated and found to exhibit reliable overall performance for combustion behavior.
Article
Computer Science, Interdisciplinary Applications
Zineb Bouabidi, Mary A. Katebah, Mohamed M. Hussein, Abdur Rahman Shazed, Easa I. Al-musleh
Summary: The LNG chain requires significant resources and improving efficiency is crucial for environmental concerns. By utilizing various optimization and integration opportunities, advancements can be made, although many potentials are overlooked.
COMPUTERS & CHEMICAL ENGINEERING
(2021)
Article
Energy & Fuels
Dawei Wang, Heng Zhang, Yuehua Qian, Kangyao Deng
Summary: This study fills the gap by focusing on energy and exergy analysis to improve the deterioration of fuel economy caused by EGR. Results show that reducing irreversibility will be more efficient, and suggest methods to reduce temperature gradient and proportion of premixed combustion.
Article
Chemistry, Physical
Alper Can Ince, Mustafa Fazil Serincan, C. Ozgur Colpan
Summary: This paper aims to identify the irreversibilities in the condenser of a direct methanol fuel cell (DMFC) system and present possible enhancements in its design through local entropy generation analysis (L-EGA). The study calculates the local entropy generation terms originating from heat and mass transfer in the condenser under variable operating conditions. The results show differences in irreversibilities due to heat and mass transfer, and the exergy destruction ratio provides an estimation of the condenser's exergy performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Green & Sustainable Science & Technology
Ataollah Khanlari, Adnan Sozen, Faraz Afshari, Azim Dogus Tuncer
Summary: Solar energy is being widely explored as a clean energy source to meet a large portion of energy demand in the future. A square-spiral finned quadruple-flow solar collector has been designed and compared with a finless collector in this study, demonstrating higher efficiency.
Article
Energy & Fuels
Suya Gao, Junhao Yan, Timothy H. Lee, Chia-Fon Lee
Summary: The objective of this study is to develop a comprehensive model for spray atomization considering flash boiling, and to validate the model through simulations and experiments. The results show that the flash boiling model accurately captures the spray characteristics under different conditions, indicating the effectiveness of the model.
Article
Biochemistry & Molecular Biology
Xinjia Guo, Bing Xu, Zheshu Ma, Yanju Li, Dongxu Li
Summary: Based on finite-time thermodynamics, an irreversible high-temperature proton exchange membrane fuel cell (HT-PEMFC) model is developed to study the influence of thermodynamic irreversibility on the sustainability of HT-PEMFC.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Thermodynamics
Galip Kaltakkiran, Halil Ibrahim Akolas, Kadir Bakirci
Summary: In this study, classical and electronically controlled external EGR cooling systems are designed to investigate the effect of EGR rates and EGRout gas temperatures on engine performance and energy efficiency. The results show that the EGR rate has a more dominant effect on combustion performance and efficiency, and recommended to select the optimum EGR rate and EGRout gas temperature for engine performance and energy efficiency.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Thermodynamics
Omolbanin Shakouri, Mamdouh El Haj Assad, Emin Acikkalp
Summary: This paper examines a hybrid cycle system composed of a solid oxide fuel cell and an Ericsson thermal engine that provides drinking water by connecting to a reverse osmosis desalination unit. A parametric assessment is conducted on target functions such as power, exergy destruction density, and fresh water production, with three scenarios defined for simultaneous optimization. Decision-making methods like TOPSIS, FUZZY, and LINMAP are used to determine the ultimate solution among the beam fronts in all three scenarios.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Thermodynamics
Zahra Mohammadi, Pouria Ahmadi, Mehdi Ashjaee
Summary: The current research proposes a novel integrated energy system that generates clean and sustainable power for building applications. This system utilizes a proton exchange membrane (PEM) fuel cell to produce power and heat from syngas, as well as a dual-ejector organic flash cycle (DOEFC) to efficiently recover waste heat from the upper process. The system's technological, economic, and environmental aspects are examined. A two-criteria optimization is conducted to identify the system's best operation point, aiming for lower cost and emissions, as well as higher efficiency. Additionally, a parametric study reveals the impact of key parameters on system performance. The results indicate energy and exergy efficiencies of approximately 37.65% and 23.77%, respectively. The components responsible for the highest exergy destruction rate are the Afterburner (5.84 MW), PEM-FC (5.04 MW), and selective CO oxidizer (3.32 MW). Notably, the fuel cell contributes the most to the total exergy destruction due to irreversibilities. Furthermore, the optimal solution point for this system has a net output power of 2.66 MW and a total cost rate of 5.39 $/h.
Article
Chemistry, Physical
Andres Rojano, Andres Cordoba, Jens H. Walther, Harvey A. Zambrano
Summary: A comprehensive understanding of fluid dynamics of dilute electrolyte solutions in nanoconfinement is essential to develop more efficient nanofluidic devices. In nanoconduits, the electrical double layer can occupy a considerable part of the channel cross-section, therefore the transport properties of a nanoconfined electrolyte solution can be altered by interfacial phenomena such as the charge inversion (CI).
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Green & Sustainable Science & Technology
Hadi Taghavifar
Summary: In this study, the potential of gaseous fuels such as hydrogen, methane, and hythane in combination with diesel fuel is assessed. The results show that the entropy generation in hythane and hydrogen is higher compared to diesel, while water injection can reduce entropy. The study also compares the engine performance and emissions characteristics of different fuel blends.
ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY
(2023)
Article
Thermodynamics
Jiun Cai Ong, Yan Zhang, Shijie Xu, Jens Honore Walther, Xue-Song Bai, Kar Mun Pang
Summary: The present study uses large-eddy simulations (LES) to investigate the ignition and stabilization mechanisms of ECN Spray A flame under different injection pressures and ambient temperatures. The numerical model is validated against experimental data and the role of auto-ignition in flame stabilization is found to be crucial.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Chemistry, Applied
Sima Majidi, Hamid Erfan-Niya, Jafar Azamat, Soroush Ziaei, Eduardo R. Cruz-Chu, Jens Honore Walther
Summary: The global demand for clean and potable water is increasing due to population growth and pollution. Water contamination is a global problem that needs to be investigated for proper strategies to improve water quality and reduce water scarcity. Membrane technologies for water purification show promising results. This review discusses the use of molecular dynamics (MD) simulations to evaluate the performance of membrane-based water purification systems. The article also provides insights into recent developments and limitations of MD simulations in wastewater treatment using membranes.
SEPARATION AND PURIFICATION REVIEWS
(2023)
Article
Biochemical Research Methods
Sima Majidi, Hamid Erfan-Niya, Jafar Azamat, Eduardo R. Cruz-Chu, Jens Honore Walther
Summary: In this study, molecular dynamics simulation is used to investigate the effectiveness of graphdiyne nanosheet in separating nitrate ions from water. The results show that the fine regulation of hydrostatic pressure allows for efficient water flow and high water permeability, making graphdiyne a suitable membrane for nitrate separation.
JOURNAL OF MOLECULAR GRAPHICS & MODELLING
(2023)
Article
Chemistry, Physical
Elton Oyarzua, Jens H. H. Walther, Harvey A. A. Zambrano
Summary: The study introduces a graphene-based thermal nanopump that can produce controlled and continuous liquid flow in nanoslit channels by utilizing thermal gradients. Large-scale molecular dynamics simulations were conducted to investigate the performance of this thermal nanopump. The results show that water flow rates increase due to larger ripple fluctuations on the graphene layers as higher thermal gradients are applied, and the efficiency of the pump can be enhanced by modifying the wettability of the channel walls.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Omid Babaie Rizvandi, Arash Nemati, Hossein Nami, Peter Vang Hendriksen, Henrik Lund Frandsen
Summary: Ammonia-fueled solid oxide fuel cells show promising performance under direct feed and external pre-cracking conditions, with low risk of mechanical failure under practical operating conditions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Engineering, Chemical
Seyed Heydar Rajaee Shooshtari, Jens Honore Walther, Chuang Wen
Summary: This paper presents a novel approach using computational fluid dynamics (CFD) and genetic algorithm to provide new equations for normal shock waves. The proposed model shows more accurate predictions for shock position compared to the traditional theoretical model. It can be used as an accurate and efficient tool for shock position prediction and nozzle design.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Energy & Fuels
Ji Zhang, Zhi Cao, Sheng Huang, Xiaohui Huang, Yu Han, Chuang Wen, Jens Honore Walther, Yan Yang
Summary: In this study, a novel combination of branch-structured fins and Al2O3 nanoparticles was proposed to enhance the performance of a phase change material (PCM) in a triple-tube heat exchanger. A mathematical model was developed and validated based on experimental results, considering thermal conduction, Brownian motion of nanoparticles, and natural convection in the liquid PCM. The results showed that both nanoparticles and metal fins significantly improved the solidification behavior, with metal fins having a greater impact compared to nanoparticles.
Article
Energy & Fuels
Min Zhang, Jiun Cai Ong, Kar Mun Pang, Shijie Xu, Yan Zhang, Arash Nemati, Xue-Song Bai, Jens Honore Walther
Summary: The present study uses large eddy simulation to investigate combustion recession for the Engine Combustion Network Spray A flame under different ambient temperatures and injection pressures. The numerical results accurately capture the different combustion recession phenomena. The combustion recession is mainly controlled by the auto-ignition process at a higher ambient temperature, while at a lower ambient temperature, the local temperature within the fuel-rich region is not high enough to promote high-temperature ignition.
Article
Energy & Fuels
Arash Nemati, Jiun Cai Ong, Min Zhang, Jens Honore Walther
Summary: The auto-ignition process of micro-pilot diesel in premixed dual-fuel combustion was studied using large eddy simulation. It was found that the inhomogeneity in temperature has a more significant influence on the ignition delay time (IDT) than methane inhomogeneity. The inhomogeneity pockets of temperature advance the first-stage and second-stage ignition. This study is important for improving engine performance and reducing exhaust emissions.
Article
Mechanics
Diego Becerra, Andres Cordoba, Jens H. Walther, Harvey A. Zambrano
Summary: Through atomic-level simulations, it is found that graphene coating significantly enhances water flow in nanochannels compared to hexagonal boron nitride (hBN) coating. The natural undulations of graphene coating further enhance water flow.
Article
Engineering, Ocean
Nicolai Arent Quist, Rasmus Haurum Christensen, Henrik Mikkelsen, Jens Honore Walther
Summary: This study verifies and validates a full-scale self-propulsion CFD model that incorporates hull roughness and welding seams. The results show the importance of measuring hull roughness for accurate performance calculations and the increase in resistance caused by welding seam modeling.
APPLIED OCEAN RESEARCH
(2023)
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.
