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Numerical and Experimental Study on Performance of a Low-Backpressure Polyhedral thermoelectric generator for Waste Heat Recovery

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Journal of Thermal Science 2023年第1期32卷 109-124页

作者： QUAN Rui LI Yangxin LI Tao CHANG Yufang YAN Huaicheng Hubei Key Laboratory for High-efficiency Utilization of Solar Energy and Operation Control of Energy Storage System Hubei University of TechnologyWuhan 430068China Hubei Engineering Research Center for Safety Monitoring of New Energy and Power Grid Equipment Hubei University of TechnologyWuhan 430068China

Optimized fin arrangement and dimension of heat exchanger can improve the maximum output power of thermoelectric generator(TEG)system which converts the wasted heat into electricity with thermoelectric modules(TEMs).Considering that the geometric symmetry contributes to the temperature uniformity improvement and convenient TEMs arrangement,a low-backpressure TEG system based on a polyhedral-shape heat exchanger was *** assess the effect of inner topology and fin parameters on the heat transfer and output power of the TEG system,a realizable k-?turbulence based numerical model was established and validated to perform numerical *** results demonstrate that increasing fin length,fin width and fin intersection angle are beneficial to the average surface temperature,temperature distribution uniformity and maximum output power of the TEG ***,decreasing fin spacing distance contributes to the enhanced average surface temperature and maximum power of TEG system,and has insignificant effect on its temperature *** inserted fins with optimal length,width,intersection angle and spacing distance enhance higher output power,whereas result in increasing *** maximum difference between the experimental and simulation results is 3.2%,which validates the feasibility of the established numerical *** also provides a theoretical reference to the optimal design and performance analysis of low-backpressure TEG systems used in automobile exhaust heat recovery.

关键词： heat exchanger thermoelectric generator inner topology fin parameters numerical model

Natural Gas Pressure Reduction Station Self-powered by Fire thermoelectric generator

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Journal of Thermal Science 2022年第3期31卷 840-853页

作者： WANG Yupeng TONG Xiao WANG Hongmei QIU Junfeng SHEN Limei School of Energy and Power Engineering Huazhong University of Science and TechnologyWuhan430074China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen518055China Hangzhou Steam Turbine Company Limited Hangzhou310022China Shenzhen Huazhong University of Science and Technology Research Institute Shenzhen518057China

Pressure reduction station(PRS)is an essential facility in natural gas transmission,which owns the function of pressure reduction,demand-supply management and flow ***,a large number of PRSs are located in off-grid areas and powered by battery equipment resulting in high maintenance ***,how to realize the energy independence of these PRSs is an urgent issue to be ***,the natural gas fired thermoelectric generation(FTEG)module,including gas flue,cover,TEGs and heat radiators,is designed for PRS in off-grid *** change material is introduced into the FTEG module to change the operation mode from continuous mode into a periodic mode,and the prototype of the FTEG module is built to discuss the generation performance in different *** results show that the generation efficiency of the FTEG module is improved by 63%in periodic mode compared with the continuous ***,the numerical model is established to investigate the impacts of air coefficient,cold-side heat radiator and number of TEGs on the module *** found that the impacts of cold-side heat radiator and the number of TEGs are more significant than those of the air *** adjusting these key parameters,an optimized FTEG module with 32 TEGs is proposed,which has an average power generation of 16.4 W and a heat collection efficiency of 84.6%.Eventually,3 to 6 modules can be connected in series to meet the power requirement of 50 W to 100 W for *** high-performance FTEG module can accelerate the process of achieving the energy independence of PRS and promote its application in mesoscale equipment.

关键词： pressure reduction station natural gas thermoelectric generator phase change material periodic mode

A thermoelectric generator and water-cooling assisted high conversion efficiency polycrystalline silicon photovoltaic system

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Frontiers in Energy 2021年第2期15卷 358-366页

作者： Zekun LIU Shuang YUAN Yi YUAN Guojian LI Qiang WANG Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) Northeastern UniversityShenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China School of Metallurgy Northeastern UniversityShenyang 110819China Key Laboratory of Electromagnetic Processing of Materials of the Ministry of Education Northeastern UniversityShenyang 110819China

Solar energy has been increasing its share in the global energy structure. However, the thermal radiation brought by sunlight will attenuate the efficiency of solar cells. To reduce the temperature of the photovoltaic (PV) cell and improve the utilization efficiency of solar energy, a hybrid system composed of the PV cell, a thermoelectric generator (TEG), and a water-cooled plate (WCP) was manufactured. The WCP cannot only cool the PV cell, but also effectively generate additional electric energy with the TEG using the waste heat of the PV cell. The changes in the efficiency and power density of the hybrid system were obtained by real time monitoring. The thermal and electrical tests were performed at different irradiations and the same experiment temperature of 22°C. At a light intensity of 1000 W/m2, the steady-state temperature of the PV cell decreases from 86.8°C to 54.1°C, and the overall efficiency increases from 15.6% to 21.1%. At a light intensity of 800 W/m2, the steady-state temperature of the PV cell decreases from 70°C to 45.8°C, and the overall efficiency increases from 9.28% to 12.59%. At a light intensity of 400 W/m2, the steady-state temperature of the PV cell decreases from 38.5°C to 31.5°C, and the overall efficiency is approximately 3.8%, basically remain unchanged.

关键词： photovoltaic(PV) thermoelectric generator conversion efficiency hybrid energy systems water-cooled plate(WCP)

Powering a Low Power Wireless Sensor in a Harsh Industrial Environment: Energy Recovery with a thermoelectric generator and Storage on Supercapacitors

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Energy and Power Engineering 2023年第11期15卷 372-398页

作者： Vincent Boitier Bruno Estibals Lionel Seguier Laboratoire d’Analyse et d’Architecture des Systèmes—Centre National de la Recherche Scientifique Université de Toulouse Tou-louse France Université Paul Sabatier Toulouse France

Wireless sensor networks are widely used for monitoring in remote areas. They mainly consist of wireless sensor nodes, which are usually powered by batteries with limited capacity, but are expected to last for long periods of time. To overcome these limitations and achieve perpetual autonomy, an energy harvesting technique using a thermoelectric generator (TEG) coupled with storage on supercapacitors is proposed. The originality of the work lies in the presentation of a maintenance-free, robust, and tested solution, well adapted to a harsh industrial context with a permanent temperature gradient. The harvesting part, which is attached to the hot spot in a few seconds using magnets, can withstand temperatures of 200°C. The storage unit, which contains the electronics and supercapacitors, operates at temperatures of up to 80°C. More specifically, this article describes the final design of a 3.3 V 60 mA battery-free power supply. An analysis of the thermal potential and the electrical power that can be recovered is presented, followed by the design of the main electronic stages: energy recovery using a BQ25504, storage on supercapacitors and finally shaping the output voltage with a boost (TPS610995) followed by an LDO (TPS71533).

关键词： Energy Recovery Battery-Free System Supercapacitor thermoelectric generator TEG BQ25504 Energy Management Thermal Gradient

Numerical Study on thermoelectric Power generator in Combustor

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Journal of Thermal Science 2022年第6期31卷 2124-2136页

作者： LI Na WU Peiqin LU Xing XU Jinhai WANG Qiuwang CHEN Yitung MA Ting Key Laboratory of Thermo-Fluid Science and Engineering MOEXi’an Jiaotong UniversityXi'an 710049China School of Safety Science and Engineering Xi’an University of Science and TechnologyXi'an 710054China Department of Mechanical Engineering University of NevadaLas Vegas NV 89154-4027USA

Micro gas turbine is a typical distributed energy resource system. The temperature of the burning gas in the combustor reaches 1000 K or even more, which makes a huge temperature difference in the combustor an interesting topic for heat recovery. In this work, thermoelectric devices are used for heat recovery in the combustor of the micro gas turbine. A flow-thermal-electric multiple-physical numerical model is used for the combustor and thermoelectric device power generation system. The effect of the winglet vortex generators installed at the outer wall of the flame tube on the system performance is examined. The numerical results show that the best matching load is about 1.4 times the internal resistance which provides the maximum power output for the thermoelectric generator. Active cascade control of heat transfer enhancement elements on flame tube considering wall safety and conversion efficiency of thermoelectric generator under high temperature and large temperature drop is proposed. The numerical results show that the conversion efficiency of thermoelectric generator can be increased by more than 80%, and the average wall temperature can be reduced by 35 K by using non-uniform arrangement of the winglet vortex generators.

关键词： distributed energy resources micro gas turbine combustor thermoelectric generator winglet vortex generator

A Novel Design of thermoelectric generator for Automotive Waste Heat Recovery

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Automotive Innovation 2018年第1期1卷 54-61页

作者： Kuo Huang Yuying Yan Bo Li Yong Li Kai Li Jun Li Fluids and Thermal Engineering Research Group Faculty of EngineeringUniversity of NottinghamNottinghamUK Fluids and Thermal Engineering Research Centre University of Nottingham Ningbo ChinaNingboChina School of Automotive and Mechanical Engineering South China University of TechnologyGuangzhouChina FAW Group Corporation ChangchunChina

With progressively stringent fuel consumption regulations,many researchers and engineers are focusing on the employment of waste heat recovery technologies for automotive *** as a promising method of waste heat recovery,the thermoelectric generator(TEG)has been given increasing attention over the whole automotive industry for the last *** this study,we first give a brief review of improvements in thermoelectric materials and heat exchangers for TEG *** then present a novel design for a concentric cylindrical TEG system that addresses the existing weaknesses of the heat *** place of the typical square-shaped thermoelectric module,our proposed concentric cylindrical TEG system uses an annular thermoelectric module and employs the advantages of the heat pipe to enhance the heat transfer in the radial *** simulations we carried out to verify the performance of the proposed system showed better power output among the existing TEG system,and a comparison of water-inside and gas-inside arrangements showed that the water-inside concentric cylindrical TEG system produced a higher power output.

关键词： Wasteheatrecovery thermoelectric generator Heat pipe Heat transferenhancement Numerical simulation

Thermal Optimization of Exhaust-based thermoelectric generator

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Thermal Optimization of Exhaust-based Thermoelectric Generat...

Performance Evaluation of a Silicide-based thermoelectric generator for Power Generation

中国材料大会2012

作者： Yadong Deng Shan Chen Xun Liu Automobile Engineering Institute Wuhan University of Technology

ISBN: (纸本)9783037856062;3037856068

The potential for automotive exhaust heat based thermoelectric generator （TEG） has been increased with continuously advances in thermoelectric technology. The thermal performance of the heat exchanger in exhaust-based TEG was analyzed. In terms of interface temperature and thermal uniformity, the thermal characteristics of the heat exchangers with different internal structures, materials and thicknesses were discussed. CFD simulations and infrared experiments on a high-performance production engine with a dynamometer were carried out. It was proved that the plate-shape heat exchanger made of brass with internal baffles and the thickness of 3mm, obtained a relatively optimal thermal performance, and it will help to improve the thermal performance of the TEG.

关键词： Automotive exhaust heat thermoelectric generator Heat exchanger CFD simulation.

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Performance Evaluation of a Silicide-based Thermoelectric Ge...

A Novel thermoelectric generator for the Detection of Electrical Equipment

中国材料大会2012

作者： Aijun Zhou Lidong Feng Wei Liu Xinyi Dai Hengguan Cui Xinbing Zhao Jingze Li State Key Laboratory of Electronic Thin films and Integrated Devices University of Electronic Science and Technology of China State Key Laboratory of Silicon Materials Zhejiang University

ISBN: (纸本)9783037856062;3037856068

A TEG composed of p-type higher manganese silicide and n-type magnesium silicide-stannide was evaluated by theoretical simulation based on finite element method and steady-state approximation. The geometry factors, heat flux, power output and the thermal-electrical conversion efficiency of the TEG were calculated by applying the measured thermoelectric parameters of each leg into the simulation tool. Furthermore, the contact effect on the performance of the TEG was analyzed by separately introducing a contact layer between the thermoelectric legs and the metal layers having specific electrical and thermal conductivity. It was found that the different cross-sectional areas were required for the p- and n-type legs to achieve maximum module output or conversion efficiency. In ideal contact state, a promising efficiency of 8.29% can be obtained at a given temperature gradient. On the other hand, the performance of the TEG might be seriously deteriorated if the electrical or/and thermal resistance of the contact layer increased.

关键词： thermoelectric generator Simulation Finite element method Silicide

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A Novel Thermoelectric Generator for the Detection of Electr...