Article
Green & Sustainable Science & Technology
Dhruv Raj Karana, Rashmi Rekha Sahoo
Summary: By studying the performance of the exhaust heat exchanger, using a system with twisted ribs can produce more net power than a smooth surface system, and has the potential to improve fuel consumption by 0.65%.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Instruments & Instrumentation
Fatma Bayata
Summary: Thermoelectric generators that convert exhaust waste heat into electricity in vehicles face the challenge of low conversion efficiency. In this study, doped calcium cobaltites were produced using sol-gel technique to improve their high temperature thermoelectric properties. By decreasing the grain size and reducing the thermal conductivity, the doped samples showed significantly enhanced thermoelectric performance, with a maximum ZT value 2.5 times larger than that of the pure sample. This research presents a potential candidate for heat recovery in automotive exhaust thermoelectric generators.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Thermodynamics
Kartik Srivastava, Rashmi Rekha Sahoo
Summary: This study examines a new vortex generator installed on the hot side of a thermoelectric generator's exhaust heat exchanger and analyzes its performance using numerical methods. The experiment identifies the best design configuration for the vortex generator to optimize power output in a waste heat recovery system. The results show that the configuration with a pitch/channel height ratio of 3 and a tilt angle of 60 degrees achieves the highest power output. Additionally, the study finds that the vortex generator can improve the fuel consumption efficiency of the engine.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Review
Materials Science, Multidisciplinary
Babak Safaei, Sertan Erdem, Mohammad Karimzadeh Kolamroudi, Samaneh Arman
Summary: The global energy demand is increasing, leading to the development of technologies to produce required energy. Thermoelectric generators (TEGs), which can generate electricity from waste heat, have attracted significant attention. This review highlights the promising results of TEGs in different industries and the basic principles of thermoelectricity and energy harvesting from temperature gradient. Experimental and analytical studies have validated the usefulness of TEGs for energy generation. This work provides beneficial information for the optimization and application of TEGs by emphasizing the relationship between heat sources and thermoelectric modules (TEMs).
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Review
Physics, Multidisciplinary
Nassima Radouane
Summary: Our community is currently facing issues such as rising electricity costs, pollution, and global warming. Scientists are improving energy-harvesting power generators to minimize their impact, using the Seebeck effect to demonstrate the capabilities of thermoelectric generators (TEGs) in converting thermal energy into electrical energy. TEGs are environmentally friendly, operate quietly, can be fabricated using different technologies, and have a long operational lifetime. They can be integrated into various devices and have applications in fields such as automobile and biomedical.
Article
Thermodynamics
M. H. Zaher, M. Y. Abdelsalam, J. S. Cotton
Summary: An analytical model was developed to optimize the integrated design of annular thermoelectric generators with heat exchangers, proposing a dimensionless design factor to guide maximizing power generation. The study findings suggest that at the optimum design factor, the material volume of A-TEGs could potentially be reduced by 75% with only an 11% reduction in maximum power output.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Physics, Applied
Ruchika Dhawan, Hari Prasad Panthi, Orlando Lazaro, Andres Blanco, Hal Edwards, Mark Lee
Summary: Thermoelectric generators and coolers offer a potential solution for energy autonomy in internet-of-things and biomedical electronics, as well as local cooling for high-performance integrated circuits. Advancing thermoelectric technology requires research on thermoelectric materials and device physics, particularly in determining thermopower and Peltier coefficients at the device level instead of the material level.
APPLIED PHYSICS LETTERS
(2022)
Article
Thermodynamics
Indrasis Mitra, Indranil Ghosh
Summary: Cross-flow heat exchangers are widely used in various industries. This study develops a three-dimensional modeling tool to address the challenges of axial conduction and thermal resistance in miniaturized cross-flow heat exchangers. The tool is validated and compared with other models, and the results provide insights into temperature distribution, efficiency, and conduction effect factors for different flow and geometric configurations.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Energy & Fuels
Simiao Tang, Chenglong Wang, Dalin Zhang, Wenxi Tian, Guanghui Su, Suizheng Qiu
Summary: The heat pipe cooled reactor is designed to meet future energy demands with advantages such as modularity, solid state, high reliability, and passive safety. In this study, a finite element model is established to investigate the thermoelectric performance of the TEG coupled with heat pipes, and experimental validation is conducted to verify the numerical model accuracy, with a maximum simulation error within 5%. The research provides insights into the application potential of TEGs in static heat pipe cooled reactors and lays foundations for multiphysics coupling analysis of micro heat pipe cooled reactors.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Chemistry, Physical
Monikuntala Bhattacharya, Mani Ranjan, Nitish Kumar, Tanmoy Maiti
Summary: The study focuses on optimizing the performance of a SnSe-based thermoelectric generator through finite element modeling considering electrical contact loss and various heat losses under different heat boundary conditions. By strategizing to design only a p-legged architecture, step-by-step optimization of internal and system level parameters has been carried out for practical application in automobile exhaust. Comparative analysis shows that the multiple p-legged architecture outperforms the traditional p-n-legged architecture in terms of efficiency and power output, especially under the isoflux heat boundary condition.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Nuclear Science & Technology
Yin Zhang, Xiaoming Chai, Chenglong Wang, Simiao Tang, Dalin Zhang, Wenxi Tian, G. H. Su, Suizheng Qiu
Summary: This paper presents the principle of a heat pipe reactor and its application in an experimental device. Through steady-state experiments and CFD simulations, the heat transfer performance of heat pipes and the thermoelectric conversion efficiency of TEGs are verified.
PROGRESS IN NUCLEAR ENERGY
(2022)
Article
Multidisciplinary Sciences
Keerati Maneesai, Sunisar Khammahong, Pongsakorn Siripoom, Chaiwat Phrompet, Chaval Sriwong, Santi Maensiri, Chesta Ruttanapun
Summary: In order to improve the efficiency of a thermoelectric device, the effect of heat loss reduction and thermal interface resistance were investigated. A thermoelectric concrete brick was fabricated and tested, showing higher temperature difference and output voltage compared to a single-layer brick and a CaMnO3 module without a thermal concrete insulator.
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Electrical & Electronic
Yuriy Lobunets
Summary: The article discusses the importance of utilizing low-potential energy sources and the potential of thermoelectric power generation technology, highlighting the key to optimizing thermoelectric generator efficiency lies in the research of material and device parameter optimization. The researchers also emphasized the importance of mathematical modeling and the possibility of tuning thermoelectric material properties for specific tasks in external conditions.
JOURNAL OF ELECTRONIC MATERIALS
(2021)
Article
Thermodynamics
Qusay Doraghi, Alina Zabnienska-Gora, Les Norman, Beate Krause, Petra Poetschke, Hussam Jouhara
Summary: Researchers are exploring new lead-free thermoelectric materials that can convert wasted heat into electric energy. The use of polymers with lower efficiency but higher electrical conductivity and Seebeck coefficients is increasingly discussed in the literature. This article presents two thermoelectric generator models based on polypropylene melt-mixed with single-walled carbon nanotubes, which show promising results for future TEG modules.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Article
Chemistry, Multidisciplinary
Gao Min
Summary: A new theoretical formulation is reported in this paper to address the operation of thermoelectric generators under constant heat flux, allowing calculation of maximum power output and conversion efficiency. This theory opens up new pathways for studying thermoelectric properties and may lead to the development of new technologies.
ENERGY & ENVIRONMENTAL SCIENCE
(2022)
Article
Energy & Fuels
Shitong Fang, Houfan Du, Tao Yan, Keyu Chen, Zhiyuan Li, Xiaoqing Ma, Zhihui Lai, Shengxi Zhou
Summary: This paper proposes a new type of nonlinear VIV energy harvester (ANVEH) that compensates for the decrease in peak energy output at low wind speeds by introducing an auxiliary structure. Theoretical and experimental results show that ANVEH performs better than traditional nonlinear VIV energy harvesters under various system parameter variations.
Article
Energy & Fuels
Wei Jiang, Shuo Zhang, Teng Wang, Yufei Zhang, Aimin Sha, Jingjing Xiao, Dongdong Yuan
Summary: A standardized method was developed to evaluate the availability of solar energy resources in road areas, which combined the Analytic Hierarchy Process (AHP) and the Geographic Information System (GIS). By analyzing critical factors and using a multi-indicator evaluation method, the method accurately evaluated the utilization of solar energy resources and guided the optimal location selection for road photovoltaic (PV) projects. The results provided guidance for the application of road PV projects and site selection for route corridors worldwide, promoting the integration of transportation and energy.
Article
Energy & Fuels
Chang Liu, Jacob A. Wrubel, Elliot Padgett, Guido Bender
Summary: The study investigates the effects of coating defects on the performance of the anode porous transport layer (PTL) in water electrolyzers. The results show that an increasing fraction of uncoated regions on the PTL leads to decreased cell performance, with continuous uncoated regions having a more severe impact compared to multiple thin uncoated strips.
Article
Energy & Fuels
Marcos Tostado-Veliz, Xiaolong Jin, Rohit Bhakar, Francisco Jurado
Summary: In this paper, a coordinated charging price mechanism for clusters of parking lots is proposed. The research shows that enabling vehicle-to-grid characteristics can bring significant economic benefits for users and the cluster coordinator, and vehicle-to-grid impacts noticeably on the risk-averse character of the uncertainty-aware strategies. The developed pricing mechanism can reduce the cost for users, avoiding to directly translate the energy cost to charging points.
Article
Energy & Fuels
Duan Kang
Summary: Building an energy superpower is a key strategy for China and a long-term goal for other countries. This study proposes an evaluation system and index for measuring energy superpower, and finds that China has significantly improved its ranking over the past 21 years, surpassing other countries.
Article
Energy & Fuels
Fucheng Deng, Yifei Wang, Xiaosen Li, Gang Li, Yi Wang, Bin Huang
Summary: This study investigated the synergistic blockage mechanism of sand and hydrate in gravel filling layer and the evolution of permeability in the layer. Experimental models and modified permeability models were established to analyze the effects of sand particles and hydrate formation on permeability. The study provided valuable insights for the safe and efficient exploitation of hydrate reservoirs.
Article
Energy & Fuels
Hao Wang, Xiwen Chen, Natan Vital, Edward Duffy, Abolfazl Razi
Summary: This study proposes a HVAC energy optimization model based on deep reinforcement learning algorithm. It achieves 37% energy savings and ensures thermal comfort for open office buildings. The model has a low complexity, uses a few controllable factors, and has a short training time with good generalizability.
Article
Energy & Fuels
Moyue Cong, Yongzhuo Gao, Weidong Wang, Long He, Xiwang Mao, Yi Long, Wei Dong
Summary: This study introduces a multi-strategy ultra-wideband energy harvesting device that achieves high power output without the need for external power input. By utilizing asymmetry, stagger array, magnetic coupling, and nonlinearity strategies, the device maintains a stable output voltage and high power density output at non-resonant frequencies. Temperature and humidity monitoring are performed using Bluetooth sensors to adaptively assess the device.
Article
Energy & Fuels
Tianshu Dong, Xiudong Duan, Yuanyuan Huang, Danji Huang, Yingdong Luo, Ziyu Liu, Xiaomeng Ai, Jiakun Fang, Chaolong Song
Summary: Electrochemical water splitting is crucial for hydrogen production, and improving the hydrogen separation rate from the electrode is essential for enhancing water electrolyzer performance. However, issues such as air bubble adhesion to the electrode plate hinder the process. Therefore, a methodology to investigate the two-phase flow within the electrolyzer is in high demand. This study proposes using a microfluidic system as a simulator for the electrolyzer and optimizing the two-phase flow by manipulating the micro-structure of the flow.
Article
Energy & Fuels
Shuo Han, Yifan Yuan, Mengjiao He, Ziwen Zhao, Beibei Xu, Diyi Chen, Jakub Jurasz
Summary: Giving full play to the flexibility of hydropower and integrating more variable renewable energy is of great significance for accelerating the transformation of China's power energy system. This study proposes a novel day-ahead scheduling model that considers the flexibility limited by irregular vibration zones (VZs) and the probability of flexibility shortage in a hydropower-variable renewable energy hybrid generation system. The model is applied to a real hydropower station and effectively improves the flexibility supply capacity of hydropower, especially during heavy load demand in flood season.
Article
Energy & Fuels
Zhen Wang, Kangqi Fan, Shizhong Zhao, Shuxin Wu, Xuan Zhang, Kangjia Zhai, Zhiqi Li, Hua He
Summary: This study developed a high-performance rotary energy harvester (AI-REH) inspired by archery, which efficiently accumulates and releases ultralow-frequency vibration energy. By utilizing a magnetic coupling strategy and an accumulator spring, the AI-REH achieves significantly accelerated rotor speeds and enhanced electric outputs.
Article
Energy & Fuels
Yi Yang, Qianyi Xing, Kang Wang, Caihong Li, Jianzhou Wang, Xiaojia Huang
Summary: In this study, a novel hybrid Quantile Regression (QR) model is proposed for Probabilistic Load Forecasting (PLF). The model integrates causal dilated convolution, residual connection, and Bidirectional Long Short-Term Memory (BiLSTM) for multi-scale feature extraction. In addition, a Combined Probabilistic Load Forecasting System (CPLFS) is proposed to overcome the inherent flaws of relying on a single model. Simulation results show that the hybrid QR outperforms traditional models and CPLFS exceeds the best benchmarks in terms of prediction accuracy and stability.
Article
Energy & Fuels
Wen-Jiang Zou, Young-Bae Kim, Seunghun Jung
Summary: This paper proposes a dynamic prediction model for capacity fade in vanadium redox flow batteries (VRFBs). The model accurately predicts changes in electrolyte volume and capacity fade, enhancing the competitiveness of VRFBs in energy storage applications.
Article
Energy & Fuels
Yuechao Ma, Shengtie Wang, Guangchen Liu, Guizhen Tian, Jianwei Zhang, Ruiming Liu
Summary: This paper focuses on the balance of state of charge (SOC) among multiple battery energy storage units (MBESUs) and bus voltage balance in an islanded bipolar DC microgrid. A SOC automatic balancing strategy is proposed considering the energy flow relationship and utilizing the adaptive virtual resistance algorithm. The simulation results demonstrate the effectiveness of the proposed strategy in achieving SOC balancing and decreasing bus voltage unbalance.
Article
Energy & Fuels
Raad Z. Homod, Basil Sh. Munahi, Hayder Ibrahim Mohammed, Musatafa Abbas Abbood Albadr, Aissa Abderrahmane, Jasim M. Mahdi, Mohamed Bechir Ben Hamida, Bilal Naji Alhasnawi, A. S. Albahri, Hussein Togun, Umar F. Alqsair, Zaher Mundher Yaseen
Summary: In this study, the control problem of the multiple-boiler system (MBS) is formulated as a dynamic Markov decision process and a deep clustering reinforcement learning approach is applied to obtain the optimal control policy. The proposed strategy, based on bang-bang action, shows superior response and achieves more than 32% energy saving compared to conventional fixed parameter controllers under dynamic indoor/outdoor actual conditions.