Article
Thermodynamics
Zhengyang Zhao, Zhengxing Zuo, Wei Wang, Nianling Kuang, Peiyun Xu
Summary: This study proposes an opposed flow porous micro combustor structure that provides stable combustion under high inlet power. The results show that the combustor meets the temperature requirements of thermoelectric module and has a high thermal efficiency and power density. By improving the structure and customizing the thermoelectric module, the system achieves both high conversion efficiency and power density.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Thermodynamics
Yulong Zhao, Mingjie Lu, Yanzhe Li, Yulin Wang, Minghui Ge
Summary: This study investigates the effect of inserting a perforated plate on the performance of an exhaust thermoelectric generator through the construction of a mathematical model. The findings show that the insertion of the perforated plate increases the output power of the generator and an optimal installation position exists. Furthermore, the position of the perforated plate affects the voltage evenness of the modules, with the most uniform voltage distribution observed when the plate is in the middle of the third row of modules.
Article
Engineering, Chemical
Erdiwansyah, Mahidin, Husni Husin, Nasaruddin, Muhtadin, Muhammad Faisal, Asri Gani, Usman, Rizalman Mamat
Summary: Combustion efficiency is crucial in fluidized-bed combustors, and this study aims to improve efficiency by modifying hollow plates to control combustion. The results showed a combustion efficiency of 96.2% with the modification, along with increased thermal efficiency and heat transfer rates.
Article
Energy & Fuels
Neha Yedala, Niket S. Kaisare
Summary: The study developed a model framework using CFD to predict the performance of an integrated catalytic microreactor-thermoelectric generator (TEG) device. An independent TEG module modeling strategy was first proposed and validated, followed by thermal integration with a microreactor.
Article
Energy & Fuels
Mengjun Zhang, Junli Wang, Yuanyuan Tian, Yajie Zhou, Jia Zhang, Huaqing Xie, Zihua Wu, Wenqin Li, Yuanyuan Wang
Summary: This study compares the performances of annular thermoelectric generator (ATEG) and flat-plate thermoelectric generator (FTEG) with varying inlet temperature, velocity, and convective heat transfer coefficient when applied to cylindrical heat sources. The results show that both the output power and conversion efficiency of ATEG and FTEG increase with higher inlet velocity, temperature, and convective heat transfer coefficient. ATEG consistently exhibits higher conversion efficiency than FTEG, especially when the inlet temperature and/or convective heat transfer coefficient are relatively larger.
Article
Chemistry, Multidisciplinary
Zhonglin Bu, Xinyue Zhang, Yixin Hu, Zhiwei Chen, Siqi Lin, Wen Li, Yanzhong Pei
Summary: Thermoelectric technology, traditionally limited by Bi2Te3 alloys, has shown potential for higher efficiency with the development of new materials like p-GeTe and n-Mg3Sb2. These non-Bi2Te3 materials could significantly improve waste-heat recovery applications, indicating a promising future for thermoelectric technology.
ENERGY & ENVIRONMENTAL SCIENCE
(2021)
Article
Engineering, Aerospace
Mingyu Li, Qian Wang, Yuling Zhao, Xuan Dai, Wei Shang
Summary: In this study, a novel staged combustor concept that combines trapped-vortex and swirl combustion characteristics is proposed to achieve high combustion efficiency, low pollutant emissions, and robust stability in aero gas turbine engines. Experimental studies were conducted under atmospheric pressure to investigate the combustion efficiency, pollutant emissions, stability, and flame features of the combustor. The results indicate that improving the air temperature and equivalence ratio enhances combustion efficiency and that pressure drop has a significant influence at lower air temperatures but little influence at higher air temperatures.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Physical
Ming Li, Yuncong Wang, Yan Jiang, Hui Cheng, Chunwei Zhang
Summary: This study investigates the effect of intake strategies on the combustion and flows characteristics of hydrogen-chlorine synthesis combustors. The combustion performance of combustors with different nozzle structures, including annular tube, plum nozzle, and porous-bullet nozzle, was analyzed. It was found that the combustor with the porous-bullet nozzle exhibited the best gas distribution and the lowest flame height. The study also analyzed the effect of hydrogen/chlorine equivalence ratio and inlet volume flow rate on the combustor performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Sai Sreekar Yarasai, Dineshkumar Ravi, Sharan Yoganand, Thundil Karuppa Raj Rajagopal
Summary: A numerical investigation was conducted to analyze the performance and combustion characteristics of a scramjet combustor with and without a cavity. Different geometrical shapes of injectors were considered, including circle, square, and rectangle. The results showed that the circular injector with a cavity exhibited better mixing and combustion characteristics compared to the other injector models.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Energy & Fuels
Zakaria Mansouri
Summary: A novel micro-combustor with a wavy wall shape is proposed for micro-thermophotovoltaic devices, aiming to improve energy conversion efficiency. Numerical simulations show that the wavy shape increases the combustor efficiency by 8.3% compared to a flat shape. Optimum parameters for better conversion performance are reported.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2021)
Article
Chemistry, Physical
Zhongxin Liang, Liangzi Deng, Xin Shi, Shaowei Song, Congcong Xu, Ching-Wu Chu, Zhifeng Ren
Summary: In the current thermoelectric research framework, there are concerns regarding incorrect material selection and deficient device performance due to the assumption of constant thermoelectric junction contact resistivity values. This study shows that the contact resistivity in the n-type Mg3.2SbxBi2-x thermoelectric single leg is composition-dependent and high contact resistivity can considerably restrict performance. A proposed multi-layered single leg design aims to reduce contact resistivity and maximize the conversion efficiency of thermoelectric devices.
MATERIALS TODAY ENERGY
(2022)
Article
Thermodynamics
Won Hyun Kim, Tae Seon Park
Summary: In this study, the combination of H2-air micro combustor (MC) with micro-thermophotovoltaic and micro-thermoelectric systems was analyzed. The effect of multihole baffle plate on combustion efficiency and mean temperature was explored, and the results showed improvements in both parameters.
APPLIED THERMAL ENGINEERING
(2022)
Article
Chemistry, Physical
Arthur Wieder, Julia Camut, Amandine Duparchy, Radhika Deshpande, Aidan Cowley, Eckhard Mueller, Johannes de Boor
Summary: The research team has successfully developed the first a-MgAgSb/Mg2(Si,Sn)-based thermoelectric module, achieving high conversion efficiency and power through material optimization. This indicates the great potential of the module for low temperature waste heat recovery or temperature regulation applications.
MATERIALS TODAY ENERGY
(2023)
Article
Thermodynamics
Junwei Zhao, Wei Xu, Zhengfei Kuang, Rui Long, Zhichun Liu, Wei Liu
Summary: This study presents a seven-layer segmented thermoelectric generator with optimized material sequences for each semiconductor leg, resulting in improved electric power and energy conversion efficiency. Machine learning and ensemble-based regression model are employed to reveal the relationship between leg material sequences and the performance of the STEG. The results contribute to the rational design and fabrication of satisfactory STEGs.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Chemistry, Physical
Longbing Yi, Haowei Xu, Haibing Yang, Shaolin Huang, Hao Yang, Yanan Li, Qiang Zhang, Zhe Guo, Haoyang Hu, Peng Sun, Xiaojian Tan, Guoqiang Liu, Kun Song, Jun Jiang
Summary: A theoretical model was developed to analyze the Bi2Te3-based TEG system, and the results showed that increasing the height of TEG not only improves conversion efficiency but also leads to a peak value of output power. The height of the fin plays a more essential role than the thickness of the fin in optimizing the performance of TEG. By adding an electrical fan, the net output power is doubled and the net conversion efficiency is improved by more than 80%. The study also designed the structure of the TEG system for different material parameters using the theoretical method.
JOURNAL OF POWER SOURCES
(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.