Article
Thermodynamics
Tabbi Wilberforce, Hegazy Rezk, A. G. Olabi, Emmanuel I. Epelle, Mohammad Ali Abdelkareem
Summary: One of the primary challenges in fuel cell modeling is determining specific boundary conditions, which are often not fully provided by the manufacturer. This study proposed using five different algorithms to determine seven unknown parameters that affect the mathematical modeling of the cell. The artificial ecosystem-based algorithm showed the best results compared to other algorithms, indicating its effectiveness in improving accuracy and predicting performance.
Article
Thermodynamics
Bin Yoo, Kisung Lim, Hassan Salihi, Hyunchul Ju
Summary: This study investigated the impact of improving electron, heat, and oxygen transport on the performance of polymer electrolyte membrane fuel cells (PEMFC) using a three-dimensional, multiscale, two-phase model. The results showed that optimizing component materials and designs can enhance transport properties, and improved through-plane electronic conductivity and thermal conductivity are critical for achieving high-power performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Physical
A. Hamrang, M. Abdollahzadeh, A. Moradi Bilondi, F. Bagherighajari, S. M. Rahgoshay, J. C. Pascoa
Summary: This study compares the performance of a PEMFC with conventional parallel serpentine flow fields and parallel serpentine-baffled flow fields. The results show that the PSBFF design can significantly improve cell performance, especially at higher pressure, temperature, and stoichiometric ratio.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Thermodynamics
Tianze Wang, Jinliang Xu, Zhaofu Wang, Haonan Zheng, Jianhui Qi, Guanglin Liu
Summary: This study presents a comprehensive model for predicting the characteristic sizes, irreversible losses, and efficiencies of supercritical carbon dioxide turbines. The results show that the characteristic sizes follow a scale law, while the losses exhibit different scaling relationships. These findings can be used to optimize turbine design.
Article
Electrochemistry
Nammin Lee, Masoomeh Ghasemi, Bonghyun Kim, Seungbeen Choe, Kisung Lim, Seung Woo Lee, Seung Soon Jang, Hyunchul Ju
Summary: Air-cooled fuel cell systems are recognized as suitable technology for drone and aviation applications due to their lightweight and simple design. However, compared to liquid-cooled systems, they suffer from low specific power and unstable performance, mainly due to severe electrolyte dehydration and nonuniform current density and temperature profiles.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
David Bernhard, Thomas Kadyk, Ulrike Krewer, Sebastian Kirsch
Summary: In this study, proton exchange membrane fuel cell cathodes were degraded using accelerated stress tests. The analysis showed that unspecified voltage losses exist not only at high current densities, but already at low current densities, and these losses increase linearly with decreasing half cell voltage.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Huicui Chen, Ruirui Zhang, Zhifeng Xia, Qianyao Weng, Tong Zhang, Pucheng Pei
Summary: In this study, the performance characteristics of a proton exchange membrane fuel cell under load shedding with different air flow rates were investigated. Voltage and cathode pressure drop were used to identify cathode flooding. The results show that reducing the load can lower impedance and lessen floods within a certain range. A stepped load shedding pattern was proposed to solve the flooding problem, and a longer current reduction cycle was found to be more effective in alleviating flooding. The approach to obtaining the optimal load shedding pattern for other PEM fuel cells was also summarized.
Article
Energy & Fuels
Nico Keller, Thomas von Unwerth
Summary: The design of flow field and channel cross section, as well as the gas diffusion layer intrusion effect, significantly influence fuel cell performance. Engineers are challenged to find advantageous solutions from multiple criteria parameters. By combining an analytical-empirical intrusion model with a fuel cell model, current density distributions considering various factors can be calculated to determine optimal designs efficiently.
Article
Energy & Fuels
Mohammadjavad Mobarra, Miloud Rezkallah, Adrian Ilinca
Summary: The objective of this survey paper is to present the state of the art of variable speed diesel generator (VSDG) technologies and compare their performance in terms of fuel savings, increased engine lifetime, and reduced greenhouse gas emissions.
Article
Polymer Science
Adam Mohd Izhan Noor Azam, Ng Khai Li, Nurul Noramelya Zulkefli, Mohd Shahbudin Masdar, Edy Herianto Majlan, Nurul Akidah Baharuddin, Azran Mohd Zainoodin, Rozan Mohamad Yunus, Noor Shahirah Shamsul, Teuku Husaini, Siti Nur Amira Shaffee
Summary: The effects of operating parameters and electrode types on hydrogen gas production through electrolysis were investigated in a PEM electrolyzer. Various parameters including power supply, feed water flow rate, water temperature, and anode electrocatalyst type were varied. The best performance was observed with a flow rate of 2 mL/min and a temperature of 70 degrees C, using a membrane electrode assembly with a 3.0 mg/cm2 IrRuOx catalyst at the anode side. Optimal energy consumption was achieved at a current density of around 200 mA/cm2, with voltaic and energy efficiencies of 85% and 67.5% respectively. These findings highlight the importance of optimizing operating parameters to enhance the performance and reduce the costs of PEM electrolyzers.
Article
Chemistry, Physical
Yangbin Shao, Liangfei Xu, Jianqiu Li, Zunyan Hu, Yujie Ding, Weibo Zheng, Minggao Ouyang
Summary: The study proposed a novel experimental methodology to analyze the water management and other transient processes within PEMFC, showing that the transient capillary transport of liquid water within GDL dominates the lambda-V hysteresis under high humidification conditions, and successfully achieved three cycles of GDL imbibition/drainage in-situ for the first time.
JOURNAL OF POWER SOURCES
(2021)
Article
Thermodynamics
Xingwang Tang, Yujia Zhang, Sichuan Xu
Summary: This study thoroughly analyzes and quantifies the operating temperature characterization of the proton exchange membrane (PEM) fuel cell and develops an automated temperature calibration model. The model shows high accuracy and robustness in identifying the optimal operating temperature point corresponding to different current densities. The results suggest that it can provide theoretical support for the thermal control of the vehicle fuel cell system.
Article
Chemistry, Applied
Muhammad Arif, Sherman C. P. Cheung, John Andrews
Summary: Optimizing the flow channel configurations is critical for maximizing fuel cell performance. Simulation results indicate that the 3-channel serpentine configuration has the best performance, with lower pressure drop and energy requirement.
Article
Thermodynamics
Yonghua Cai, Di Wu, Jingming Sun, Ben Chen
Summary: This study investigates the influence of blockages on mass transfer and performance of PEMFC through 3D models, revealing that factors such as cross section shapes of blockages, ratios of blockage length to channel length and spacing length have a significant impact on the enhancement of mass transfer in PEMFC.
Article
Thermodynamics
Horng-Wen Wu, Tzu-Yi Ho, Yueh-Jung Han
Summary: This study investigated the performance of HT-PEM fuel cells with wall-mounted cuboid rows in the interdigitated flow channel, showing an improvement in cell performance. Through experiments, the optimal combined factor level was determined to increase electrical power and reduce pressure losses, confirming the results of numerical analysis.
Article
Physics, Multidisciplinary
Huang Chuan-Kun, Guo Jun-Cheng, Chen Jin-Can
Article
Thermodynamics
Juncheng Guo, Ling Cai, Jincan Chen, Yinghui Zhou
Article
Thermodynamics
Juncheng Guo, Ling Cai, Jincan Chen, Yinghui Zhou
Article
Materials Science, Multidisciplinary
Zhichao Xu, Juncheng Guo, Guoxing Lin, Jincan Chen
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2016)
Editorial Material
Physics, Multidisciplinary
Jincan Chen, Juncheng Guo
PHYSICAL REVIEW LETTERS
(2016)
Article
Thermodynamics
Yanchao Zhang, Juncheng Guo, Guoxing Lin, Jincan Chen
JOURNAL OF NON-EQUILIBRIUM THERMODYNAMICS
(2017)
Article
Thermodynamics
Juncheng Guo, Ling Cai, Hanxin Yang, Bihong Lin
ENERGY CONVERSION AND MANAGEMENT
(2018)
Article
Chemistry, Physical
Xiuqin Zhang, Yuan Wang, Juncheng Guo, Tien-Mo Shih, Jincan Chen
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2014)
Article
Physics, Applied
Juncheng Guo, Junyi Wang, Yuan Wang, Jincan Chen
JOURNAL OF APPLIED PHYSICS
(2013)
Article
Physics, Fluids & Plasmas
Juncheng Guo, Junyi Wang, Yuan Wang, Jincan Chen
Article
Thermodynamics
Juncheng Guo, Yuan Wang, Julian Gonzalez-Ayala, J. M. M. Roco, A. Medina, A. Calvo Hernandez
ENERGY CONVERSION AND MANAGEMENT
(2019)
Article
Thermodynamics
Juncheng Guo, Hanxin Yang, Julian Gonzalez-Ayala, J. M. M. Roco, A. Medina, A. Calvo Hernandez
ENERGY CONVERSION AND MANAGEMENT
(2020)
Article
Physics, Multidisciplinary
Zhexu Li, Haibo Cao, Hanxin Yang, Juncheng Guo
Summary: Thermally driven heat pump systems are evaluated and compared using irreversible thermodynamic models under a low-dissipation assumption. The results provide optimal construction designs and boundaries for the performance of different systems.
Article
Physics, Multidisciplinary
Zhexu Li, Julian Gonzalez-Ayala, Hanxin Yang, Juncheng Guo, A. Calvo Hernandez
Summary: In this paper, a general non-combined model of a three-terminal refrigerator beyond specific heat transfer mechanisms is established based on the low-dissipation assumption. The relation between the optimized cooling power and the corresponding coefficient of performance (COP) is analytically derived, and the upper and lower bounds of the maximum cooling power (CMP) are obtained. It is found that the upper bounds are the same, whereas the lower bounds are quite different, indicating that the claimed universal equivalence for the combined and non-combined models is invalid within the frame of low-dissipation assumption.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2022)
Article
Thermodynamics
Haibo Cao, Zhexu Li, Wanli Peng, Hanxin Yang, Juncheng Guo
Summary: In this paper, a generic model of three-terminal heat transformer without reference to any specific heat-transfer law is established on the basis of the low-dissipation assumption. The optimum behaviors and parametric choices under two different parameter constraints are investigated and compared. The influences of dissipation symmetry on several key performance indicators are discussed, leading to the important results of the performance bounds of coefficient of performance (COP) at maximum heating load and maximum Omega regimes.
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.
