Article
Thermodynamics
Yuanyuan Tian, Anbang Liu, Junli Wang, Yajie Zhou, Chengpeng Bao, Huaqing Xie, Zihua Wu, Yuanyuan Wang
Summary: The study investigates the impact of phase change temperature of phase change material (PCM) on the output power and generated electricity of PCM-TEG system. Results show that optimizing the phase change temperature of PCM can enhance the total generated electricity by as much as 15.6% through matching PCM with thermoelectric properties of the thermoelement. Furthermore, a relationship between the optimal phase change temperature of PCM and the temperature for maximum figure of merit (ZT) of the thermoelement is established, providing a selection criterion for PCM in TEG modules.
Article
Green & Sustainable Science & Technology
Ding Luo, Ruochen Wang, Yuying Yan, Zeyu Sun, Weiqi Zhou, Renkai Ding
Summary: This work proposes a novel fluid-thermal-electric multiphysics numerical model to predict the performance of thermoelectric generator systems applied to fluid waste heat recovery by considering the multiphysics coupling effects. The output power predicted by COMSOL coupled solver is 8.52% higher than that predicted by COMSOL separate solver. The TEG system's output performance predicted by ANSYS is less affected by inlet air boundary conditions than by COMSOL.
Article
Green & Sustainable Science & Technology
Jinyoung Ko, Jae-Weon Jeong
Summary: This study evaluated the energy generation potential of a thermoelectric generator-assisted building-integrated photovoltaic system with a phase change material, which resulted in solar cell temperature reduction and additional electricity output due to the Seebeck effect, increasing the total generated energy from the system.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Energy & Fuels
Dalong He, Dongbin Ou, He Gao, Fangkun Jiao
Summary: A novel PCM-TEG system was reported in this study, integrating PCM with TEG to improve output performance. The presence of PCM was found to increase the temperature difference between the two sides of the TEG, effectively promoting its energy conversion potential, providing a solution for electrical power source in wireless structural health monitoring systems.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Thermodynamics
Kuo Huang, Yuying Yan, Guohua Wang, Bo Li
Summary: This study introduces a new concept of integrating phase change material with TEG to improve its transient performance and overall efficiency. By selecting Pentaerythritol as the suitable PCM, the impact of exhaust gas temperature fluctuations on automotive TEG is reduced, thereby improving efficiency under various driving conditions. Experiments show that the open circuit voltage and power output can be improved by 0.7% and 1.16%, respectively, with the integration of PCM.
Article
Thermodynamics
Dongxu Ji, Shuwen Hu, Yu Feng, Jiang Qin, Zhijian Yin, Alessandro Romagnoli, Junhua Zhao, Huihuan Qian
Summary: The study proposed a simulation model and design methodology for a solar thermoelectric generator, analyzed various design parameters to find the optimal design parameters set, and improved the output power performance.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Energy & Fuels
Francisco J. Montero, Ravita Lamba, Sarveshwar Singh, Wolfram Jahn, Wei-Hsin Chen
Summary: This paper focuses on the energy and exergy analysis of a bidirectional solar thermoelectric generator coupled to a latent heat storage and cooling system. The study investigates the impact of various parameters on the energy and exergy efficiencies of the generator and identifies container insulation as the most influential design parameter.
FRONTIERS IN ENERGY RESEARCH
(2023)
Article
Energy & Fuels
Kosei Nemoto, Ryosei Takeuchi, Masaaki Baba, Masatoshi Takeda, Noboru Yamada
Summary: This study focuses on the use of phase-change materials (PCM) for thermal control to stabilize the output power of thermoelectric generators (TEG). The experimental results demonstrate that TEG with vanadium dioxide (VO2) as the PCM exhibits better power generation performance and output power stability compared to TEG with paraffin.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Thermodynamics
Esmaeil Youse, Ali Abbas Nejad, Alireza Rezania
Summary: Phase change materials are a useful means for energy storage and thermal management in thermoelectric generator systems. This study explores the use of metal foams in conjunction with PCM to enhance heat transfer and power generation in transient heat load conditions.
Article
Thermodynamics
Rui Quan, Junhui Wang, Wenlong Liang, Xuerong Li, Yufang Chang
Summary: This study proposes a polygonal heat exchanger with embedded sickle-shaped fins to enhance the utilization efficiency of exhaust gas in thermoelectric generator systems. A numerical model is developed to analyze the impact of different fin variables on system performance, which is validated on a test bench. The results show that embedded sickle fins significantly improve the TEG performance, with higher fins enhancing the system's output power and temperature uniformity.
APPLIED THERMAL ENGINEERING
(2024)
Article
Energy & Fuels
Alireza Rezania, Esmaeil Yousefi, Ali Abbas Nejad
Summary: This study aims to eliminate the cooling energy in TEG systems by integrating low temperature phase change material (PCM) and porous copper foam on the cold side of the TEG. The results show that this fanless heat sink is an effective cooling solution for TEG systems and increases the output power of the TEG compared to conventional systems.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Chemistry, Physical
Jaeyoo Choi, Chaochao Dun, Carlos Forsythe, Madeleine P. Gordon, Jeffrey J. Urban
Summary: This paper introduces a lightweight wearable thermoelectric cooler with a flexible heatsink, achieving efficient cooling performance and long cooling capacity. With the optimized ternary composite heatsink, cooling at 5K temperature was achieved under ambient conditions, demonstrating potential applications in real-world scenarios.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
Article
Green & Sustainable Science & Technology
Jun Wang, Xiangxiang Song, Qiqiang Ni, Xingjun Li, Qingtian Meng
Summary: Thermal management of thermoelectric generator systems is crucial, and using phase change materials can effectively reduce temperature fluctuations and extend operation time, although it cannot achieve the peak output power of common systems.
Article
Engineering, Multidisciplinary
T. I. Zohdi, G. J. Moridis
Summary: This work presents a model and rapid simulation strategy for the electrically-driven dissociation of subsurface gas hydrates. The objective is to develop an easy-to-calibrate model and strategy that can guide the delivery of current, electric field, and Joule heating. The model allows for rapid computation, making it suitable for parameter variation and data-model calibration using Machine Learning paradigms.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Yuanyuan Jing, Jun Luo, Xue Han, Jiawei Yang, Qiulin Liu, Yuanyuan Zheng, Xinyi Chen, Fuli Huang, Jiawen Chen, Qinliang Zhuang, Yanan Shen, Haisheng Chen, Huaizhou Zhao, G. Jeffrey Snyder, Guodong Li, Ting Zhang, Kun Zhang
Summary: Researchers have developed a large-area, durable, washable, and skin-conformable wearable thermoelectric textile that can rapidly and stably cool the body surface and be powered by solar energy, reducing energy consumption.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Thermodynamics
Esmaeil Youse, Ali Abbas Nejad, Alireza Rezania
Summary: Phase change materials are a useful means for energy storage and thermal management in thermoelectric generator systems. This study explores the use of metal foams in conjunction with PCM to enhance heat transfer and power generation in transient heat load conditions.
Article
Engineering, Environmental
Fatma Marrakchi, Saqib Sohail Toor, Asbjorn Haaning Nielsen, Thomas Helmer Pedersen, Lasse Aistrup Rosendahl
Summary: The effects of different catalysts on the production of crude bio-oils from wheat stem through hydrothermal liquefaction (HTL) were studied. It was found that Na2CO3 catalyst resulted in a yield of 30.85 wt% crude bio-oil with the highest higher heating value (HHV) of 34.36 MJ/kg and the lowest hydrochar content of 22.03 wt%. Additionally, HTL-AP treatment with various catalysts showed significant removal efficiencies for pollutants, such as COD, TOC, phenols, total N, P, and dissolved K.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Thermodynamics
Yeyun Cai, Ning Ding, A. Rezania, Fang Deng, L. Rosendahl, Jie Chen
Summary: For designing thermoelectric generation systems in practice, it is important to maximize output power, system efficiency, and minimize system investment. Existing studies often make ideal assumptions about the input heat and coefficients, and focus more on optimizing the geometry of the thermoelectric generator (TEG) rather than the system parameters. This study proposes a transient model that considers three system parameters and explores their effects on output power, conversion efficiency, and system investment, leading to a more comprehensive and efficient system design.
Article
Acoustics
Majid Khazaee, John E. Huber, Lasse Rosendahl, Alireza Rezania
Summary: This paper presents a four-point bending piezoelectric energy harvester with extensive investigation and modeling to identify influential parameters for improving energy conversion efficiency. The electromechanical analytical model is verified by experimental data. The study compares the four-point bending harvester with standard cantilever harvesters in terms of voltage generation, mechanical strain, and figure of merit. Optimal operating conditions for the four-point bending harvester are investigated using dimensionless parameters.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Energy & Fuels
Xingjun Li, Jun Wang, Zhiqiang Huang, Dan Yu, Alireza Rezaniakolaei
Summary: Thermoelectric modules (TEMs) have great potential in energy conversion, especially in thermoelectric generator (TEG) and thermoelectric cooler (TEC) systems. However, there has been limited research on the influence of TEG's Peltier effect on the TEC-TEG hybrid system. In this study, an experimental setup is used to investigate the impact of TEG's Peltier effect on the exergy of the TEC-TEG system, with a focus on the performance of the TEC. The results show that the Peltier effect produced by TEG benefits the operation of the TEC, and by optimizing the thermal resistance of the hybrid system, the total output power can be increased by 14.2% compared to a standalone TEC system under the same conditions.
Article
Energy & Fuels
Alireza Rezania, Esmaeil Yousefi, Ali Abbas Nejad
Summary: This study aims to eliminate the cooling energy in TEG systems by integrating low temperature phase change material (PCM) and porous copper foam on the cold side of the TEG. The results show that this fanless heat sink is an effective cooling solution for TEG systems and increases the output power of the TEG compared to conventional systems.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Thermodynamics
Ali Mohammadnia, Alireza Rezania
Summary: The purpose of this study was to experimentally investigate the electrical arrangement of TEGs and the design of a DCDC boost converter in order to optimize the harvesting of electrical power from low-temperature sources of heat in TEG systems. The results provide a guide for selecting a suitable arrangement in a system with multiple TEGs and for designing matched DC-DC converters.
ENERGY CONVERSION AND MANAGEMENT-X
(2023)
Article
Energy & Fuels
Milad Hasani, Majid Khazaee, John E. Huber, Lasse Rosendahl, Alireza Rezania
Summary: In this study, the prominent features and characteristics of four-point bending energy harvesters (FPB-EH) were investigated to improve energy conversion in piezoelectric energy harvesters. The innovative FPB configuration extends energy harvesting capabilities compared to conventional cantilever beams. A comprehensive analytical electromechanical model, which includes multi-beam sections and multi-mode-shape functions, was developed and validated against experimental results and finite element analysis. The parametric study showed that the FPB configuration can enhance energy conversion efficiency and normalized output energy by factors of over 3 and 6, respectively. Guidance is provided for selecting between cantilever and four-point bending configurations.
Article
Thermodynamics
Hengfeng Yuan, Shaowei Qing, Shangkun Ren, Alireza Rezania, Lasse Rosendahl, Xiankui Wen, Jingliang Zhong, Xiaolong Gou, Shengli Tang, E. Peng
Summary: In this study, a novel hollow PDMS-filler design is proposed to improve the performance of the thermoelectric generator (TEG). The effects of longitudinal and transverse hollow structures on the TEG's output power and optimal fill factor are evaluated using a validated thermal and electrical coupled model, and the impact of key geometrical and physical parameters on TEG design optimization is revealed. Results show that the transverse-hollow structure combined with both-sides high-thermal-conductivity layers can significantly increase the TEG's output power up to 137.34 μWcm<sup>2</sup>, presenting a potential solution for the next generation of efficient and low-cost flexible TEGs.
Article
Thermodynamics
Ali Mohammadnia, Alireza Rezania
Summary: This study investigates the performance of a pyroelectric energy harvester (PEH) used as a dielectric substrate in power electronic modules, and develops a comprehensive analytical model in MATLAB software to validate the theoretical results with experimental data. The results show that the pyroelectric substrate can harvest an average power of 50 μW/cm2. It is also found that input heat rate frequency higher than 2 Hz has no significant impact on power generation by the pyroelectric module, and convective cooling density with low heat transfer coefficients can increase power generation.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Chemistry, Physical
Masoumeh Karimi Kisomi, Sadegh Seddighi, Raheleh Mohammadpour, Alireza Rezaniakolaei
Summary: The removal efficiency of traditional air filters decreases with decreasing particle size. To tackle this issue, this study proposes a novel approach by combining triboelectric nanogenerator (TENG) properties with air filters and face masks. The study investigates key parameters such as airflow velocity, particle size, and applied voltage, and suggests suitable triboelectric materials. Results show that the suggested triboelectric-based filter improves the removal efficiency from 23.0% to 99.0%, with a 4 times higher efficiency compared to traditional filters. The study highlights the potential of utilizing antibacterial and polymer-based triboelectric materials in various applications.
