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Comprehensive modeling for geometric optimization of a thermoelectric generator module SCIE
期刊论文 | 2019 , 183 , 645-659 | ENERGY CONVERSION AND MANAGEMENT
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Abstract :

This paper develops a one-dimensional simulation model of a thermoelectric module aiming at its characteristic exploration and output performance prediction. Almost all related effects are considered including Seebeck, Peltier, Thomson effects, the spatial- and temperature-dependent thermoelectric material properties, as well as the other irreversible factors. In order to ensure its high accuracy and computational efficiency, the differential equations built for components of non-linear physical properties, and analytical equations for the others of constant properties are jointly solved by numerical methods and implemented in MATLAB integrated development environment. A small deviation of 1.44% exists between its calculated output power and that by a previously reported three-dimensional model under a specific wide load range (0-250 Omega), validating its accuracy of this model. Besides, it indicates that both the proportions of heat leakage through the occupied air zone and its maximum output power to the input total heat flow have the same order of magnitude. A rising proportion for the former has to be paid attention in case of a higher temperature difference applied. The assumption of regarding its electrical contact resistance as an identical external resistance connected with the load in series is computationally proved to generate a negligible discrepancy in terms of TEM characteristics and its output performance. Furthermore, with respect to the impacts of TEM geometry, the pre-set fixed substrate area weakens the equivalence of regarding a thermoelectric module with larger cross-section area of thermoelectric legs as multiple identical modules with smaller leg areas connected in parallel. It accounts for the better linearity of rising output power by a long leg than that by a short leg as the leg area increases. A long thermoelectric leg means an increased induced electrical potential and inner resistance as well, thus leading to a single peak of the output power as the leg length increases. Finally, a thermoelectric geometric optimization approach abased on the Hill-climbing algorithm is introduced and first applied for the maximum output. Its accuracy and efficiency are validated and analyzed detailedly by supplying different variables as initial search point. All the methods and conclusions in this paper can assist thermoelectric generators' performance estimation and guide the geometric optimizations regarding their large-scale applications in the future.

Keyword :

Thermoelectric generator modeling The Hill-climbing algorithm Thermoelectric performance Geometric optimization method

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GB/T 7714 He, Hailong , Wu, Yi , Liu, Weiwei et al. Comprehensive modeling for geometric optimization of a thermoelectric generator module [J]. | ENERGY CONVERSION AND MANAGEMENT , 2019 , 183 : 645-659 .
MLA He, Hailong et al. "Comprehensive modeling for geometric optimization of a thermoelectric generator module" . | ENERGY CONVERSION AND MANAGEMENT 183 (2019) : 645-659 .
APA He, Hailong , Wu, Yi , Liu, Weiwei , Rong, Mingzhe , Fang, Zhenxuan , Tang, Xiaojun . Comprehensive modeling for geometric optimization of a thermoelectric generator module . | ENERGY CONVERSION AND MANAGEMENT , 2019 , 183 , 645-659 .
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Spatially resolved temperature measurement in the carbon dioxide arc under different gas pressures EI SCIE Scopus
期刊论文 | 2018 , 57 (21) , 6004-6009 | APPLIED OPTICS
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Carbon dioxide (CO2) is a promising alternative to sulfur hexafluoride for high-voltage circuit breaker applications. It is important to have a detailed understanding of CO2 arc properties. In this paper, radial temperature distribution of the free burning direct current arc in pure CO2 was investigated. Optical emission spectrometry was applied under different pressures (0.5 atm, 1 atm, and 1.5 atm) and at different axial positions (1 mm, 2 mm, 3 mm above the cathode). Assuming local thermodynamic equilibrium, the Fowler-Milne method was adopted for O I 715.67 nm and O I 777.19 nm in the periphery of the arc, and the single-line method was adopted for C II 657.81 nm near the center of the arc. Radial temperature profiles obtained by these two methods were combined at the position where normal temperature was assigned. The results indicate that near the center of the arc, higher pressure would lead to lower temperature; as the distance from the cathode to the position measured increases, the maximum temperature in the arc center would decrease. In addition, the temperature would decrease more sharply toward the periphery if the central temperature of the arc is higher. (C) 2018 Optical Society of America

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GB/T 7714 Sun, Hao , Fan, Shaodi , Wu, Yifei et al. Spatially resolved temperature measurement in the carbon dioxide arc under different gas pressures [J]. | APPLIED OPTICS , 2018 , 57 (21) : 6004-6009 .
MLA Sun, Hao et al. "Spatially resolved temperature measurement in the carbon dioxide arc under different gas pressures" . | APPLIED OPTICS 57 . 21 (2018) : 6004-6009 .
APA Sun, Hao , Fan, Shaodi , Wu, Yifei , Wu, Yi , Yang, Fei , Rong, Mingzhe et al. Spatially resolved temperature measurement in the carbon dioxide arc under different gas pressures . | APPLIED OPTICS , 2018 , 57 (21) , 6004-6009 .
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Numerical study on helium-oxygen dielectric barrier discharges: From single-breakdown to multi-breakdowns per half-cycle EI SCIE Scopus
期刊论文 | 2018 , 25 (7) | PHYSICS OF PLASMAS
SCOPUS Cited Count: 1
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Abstract :

Helium-oxygen dielectric barrier discharge has received much attention due to its high efficiency and stability in producing reactive oxygen species (ROS). Previous studies evidenced that the dielectric-barrier controlled plasma would transform from single-breakdown to multi-breakdowns per half cycle with the increasing applied voltage, but the variation of densities and wall fluxes of ROS during the transformation has not been well understood. This motivates us to construct a one-dimensional fluid model for this study. The results show that the volume-averaged densities and wall fluxes of the electron, ions, and atomic metastables are temporally pulsed with each breakdown, but they are nearly invariable for the grounded neutrals (O and O-3) and molecular metastables [such as O-2(a(1)Delta g)]. For each species, the temporal pulses of density and flux of a specific species have different widths, and the widths remain almost constant in time among the breakdowns except for that of the electron. With the increasing number of breakdowns per half cycle, the wall fluence and the peak value of temporal flux pulses of O- have obviously different trends, and the energy efficiencies for the production and wall fluence increase significantly only for O- and O-3(-). Published by AIP Publishing.

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GB/T 7714 Zhang, Hong , Guo, Yang , Liu, Dingxin et al. Numerical study on helium-oxygen dielectric barrier discharges: From single-breakdown to multi-breakdowns per half-cycle [J]. | PHYSICS OF PLASMAS , 2018 , 25 (7) .
MLA Zhang, Hong et al. "Numerical study on helium-oxygen dielectric barrier discharges: From single-breakdown to multi-breakdowns per half-cycle" . | PHYSICS OF PLASMAS 25 . 7 (2018) .
APA Zhang, Hong , Guo, Yang , Liu, Dingxin , Sun, Bowen , Liu, Yifan , Yang, Aijun et al. Numerical study on helium-oxygen dielectric barrier discharges: From single-breakdown to multi-breakdowns per half-cycle . | PHYSICS OF PLASMAS , 2018 , 25 (7) .
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Highly selective detection of sulfur hexafluoride decomposition components H2S and SOF2 employing sensors based on tin oxide modified reduced graphene oxide EI SCIE Scopus
期刊论文 | 2018 , 135 , 95-103 | CARBON
WoS CC Cited Count: 18 SCOPUS Cited Count: 18
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Abstract :

In this paper, a high-performance sensor based on tin oxide modified reduced graphene oxide (SnO2-rGO) has been prepared via a one-step hydrothermal process for the detection of sulfur hexafluoride (SF6) decomposition components H2S and SOF2. The morphology and nanostructure of the product were characterized by X-ray diffraction (XRD), Raman spectroscopy (RS), scanning electron microscopy (SEM), and energy dispersive spectrometer (EDS). The gas sensing properties of SnO2-rGO nanocomposite were investigated by exposing to various target gases. The experimental results revealed that SnO2-rGO sensor exhibited better responses (34.31% and -3.13%) than those (5.97% and -1.45%) of pristine rGO sensor at the optimal temperature of 125 degrees C in the presentence 100 ppm H2S and 10 ppm SOF2, respectively. Meanwhile, SnO2-rGO sensor emerged as one of the promising candidate materials to select these two gases by yielding opposite response to H2S and SOF2. In addition, uniformity, repeatability, long-term stability of SnO2-rGO sensors were investigated to demonstrate the practicability, and the possible mechanism of SnO2-rGO nanocomposite for sensing H2S and SOF2 was discussed. (C) 2018 Elsevier Ltd. All rights reserved.

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GB/T 7714 Chu, Jifeng , Wang, Xiaohua , Wang, Dawei et al. Highly selective detection of sulfur hexafluoride decomposition components H2S and SOF2 employing sensors based on tin oxide modified reduced graphene oxide [J]. | CARBON , 2018 , 135 : 95-103 .
MLA Chu, Jifeng et al. "Highly selective detection of sulfur hexafluoride decomposition components H2S and SOF2 employing sensors based on tin oxide modified reduced graphene oxide" . | CARBON 135 (2018) : 95-103 .
APA Chu, Jifeng , Wang, Xiaohua , Wang, Dawei , Yang, Aijun , Lv, Pinlei , Wu, Yi et al. Highly selective detection of sulfur hexafluoride decomposition components H2S and SOF2 employing sensors based on tin oxide modified reduced graphene oxide . | CARBON , 2018 , 135 , 95-103 .
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Research on a Novel Bidirectional Direct Current Circuit Breaker EI CPCI-S Scopus
会议论文 | 2017 , 370-374 | 4th International Conference on Electric Power Equipment-Switching Technology (ICEPE-ST)
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Abstract :

A novel Medium Voltage Direct Current (MVDC) circuit breaker consisting of a High-Speed Switch(HSS) and a bridge-type commutation branch, which is based on current injection, is proposed and analyzed in this paper. The commutation branch of this design adopts bridge type, which can break bidirectional fault current rapidly by controlling thyristors. Meanwhile, after fault current is commutated to the commutation branch completely, the freewheeling diodes can provide time for dielectric recovery with zero recovery voltage across 1155, which can improve the reliability of fault current breaking. The principle and operation sequence of this topology are described. Based on the simulation model, the breaking process in 10kV DC system with different fault current rates of rise are simulated. Besides, the relationship between the current commutation capability and the loop inductance is investigated. Finally, the prototype of 10kV DC circuit breaker is constructed, and the fault current breaking tests are carried out with breaking current of 20kA and above, which validate the feasibility and effectiveness of the topology and simulation model well.

Keyword :

DC circuit breaker bridge-type commutation branch medium voltage bidirectional current breaking

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GB/T 7714 Wu, Yifei , Su, Yang , Han, Guiquan et al. Research on a Novel Bidirectional Direct Current Circuit Breaker [C] . 2017 : 370-374 .
MLA Wu, Yifei et al. "Research on a Novel Bidirectional Direct Current Circuit Breaker" . (2017) : 370-374 .
APA Wu, Yifei , Su, Yang , Han, Guiquan , Wu, Yi , Yi, Qiang , Sun, Guanshu et al. Research on a Novel Bidirectional Direct Current Circuit Breaker . (2017) : 370-374 .
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Review on the simulation method of non-equilibrium arc plasma during current zero period in the circuit breaker EI CSCD PKU
期刊论文 | 2017 , 32 (2) , 1-12 and 23 | Diangong Jishu Xuebao/Transactions of China Electrotechnical Society
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Abstract :

The study of simulation aiming at the current-zero periods of plasma is significant for guiding the research and design of the circuit breaker, improving its switching capacity and understanding the development process of the current-zero periods of plasma. Since the development process of the current-zero periods of plasma is coupled with the collective effects of flow, heat and electromagnetic fields, descriptions of that process are still difficult for related study. Because of the particularity of arc's dynamic activities during the current-zero periods, LTE hypothesis which is put forward in the former study is not applicable during the period, and there exists some deviation between the predicted arc activities and reality. Recently theoretical research based on thermodynamics and chemically non-equilibrium hypothesis demonstrates better coherency, arousing a general interest among the simulations during the current-zero periods. This essay introduces the development of the simulation, modeling and experiments on the arc plasmas based on thermodynamics and chemically non-equilibrium hypothesis respectively. Appropriate conclusions on arc plasma during the current-zero periods were drawn and future work was suggested. © 2017, The editorial office of Transaction of China Electrotechnical Society. All right reserved.

Keyword :

Arc plasma Collective effects Current zero period Development process Non equilibrium Simulation calculation Theoretical research

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GB/T 7714 Rong, Mingzhe , Wu, Yi , Yang, Fei et al. Review on the simulation method of non-equilibrium arc plasma during current zero period in the circuit breaker [J]. | Diangong Jishu Xuebao/Transactions of China Electrotechnical Society , 2017 , 32 (2) : 1-12 and 23 .
MLA Rong, Mingzhe et al. "Review on the simulation method of non-equilibrium arc plasma during current zero period in the circuit breaker" . | Diangong Jishu Xuebao/Transactions of China Electrotechnical Society 32 . 2 (2017) : 1-12 and 23 .
APA Rong, Mingzhe , Wu, Yi , Yang, Fei , Sun, Hao , Niu, Chunping , Duan, Jiawei . Review on the simulation method of non-equilibrium arc plasma during current zero period in the circuit breaker . | Diangong Jishu Xuebao/Transactions of China Electrotechnical Society , 2017 , 32 (2) , 1-12 and 23 .
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Thermophysical Properties Calculation of C4F7N/CO2 mixture Based on Computational Chemistry-A Theoretical Study of SF6 Alternative EI CPCI-S Scopus
会议论文 | 2017 , 255-258 | 4th International Conference on Electric Power Equipment-Switching Technology (ICEPE-ST)
WoS CC Cited Count: 4 SCOPUS Cited Count: 9
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Abstract :

An SF6 alternative gas, C4F7N mixed with CO2, has attracted great attention in recent years. The related experimental reports show that it has good insulation, thermal dissipation, switching performances and other characteristics. In theoretical research area, the thermophysical properties of plasma are of great significance to study the arc behaviour. However, for C4F7N, due to its complicated molecular structure, the decomposition process during the arc process is still unknown. Also for the particles generated as the temperature increases, the spectral parameters are not available. Therefore, the studies on the thermophysical property of C4F7N are rarely reported. In order to obtain the decomposition process, we assumed that the decomposition of C4F7N molecules is in the form of covalent bond cleavage. Then the main decomposition path and decomposition products of C4F7N can be obtained by analyzing the molecular bond energy. The relevant parameters of gas particles were calculated from the molecular structure using computational chemistry software. Based on the composition results assuming local thermodynamic equilibrium, the transport properties including viscosity, thermal conductivity and electrical conductivity of C4F7N -CO2 were calculated in the temperature range from 300 to 30000 K and at the pressures between 0.1 and 16 atm, using Chapman enskog method. For the collision integrals, the phenomenological potential was adopted.

Keyword :

plasma composition of large gas molecule C4F7N SF6 alternative plasma transport properties

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GB/T 7714 Wang Chunlin , Wu Yi , Sun Hao et al. Thermophysical Properties Calculation of C4F7N/CO2 mixture Based on Computational Chemistry-A Theoretical Study of SF6 Alternative [C] . 2017 : 255-258 .
MLA Wang Chunlin et al. "Thermophysical Properties Calculation of C4F7N/CO2 mixture Based on Computational Chemistry-A Theoretical Study of SF6 Alternative" . (2017) : 255-258 .
APA Wang Chunlin , Wu Yi , Sun Hao , Duan Jiawei , Niu Chunping , Yang Fei . Thermophysical Properties Calculation of C4F7N/CO2 mixture Based on Computational Chemistry-A Theoretical Study of SF6 Alternative . (2017) : 255-258 .
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An investigation of arc root motion by dynamic tracing method EI CPCI-S Scopus
会议论文 | 2017 , 647-650 | 4th International Conference on Electric Power Equipment-Switching Technology (ICEPE-ST)
WoS CC Cited Count: 1
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Abstract :

In this paper, an investigation of arc root behavior on a pair of parallel electrodes is presented. An effective filtering method is introduced to allow the clear observation of arc root behavior. The position of the arc root is identified and tracked by a multi-objective dynamic tracing algorithm. Thus the trajectories and the speeds of arc roots can be obtained. The results show that the movement of the cathode arc root is generally continuous while that of anode arc root has a jumping pattern. However, we find the jumping events of cathode root in a certain case, and we show that the anode arc root can strongly affect the motion of cathode arc root. We also illustrate that the bent arc jet, the high melting point material and the low work function of cathode can promote the rapid movement of the arc root.

Keyword :

Arc root Arc jet Speed Jumping pattern

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GB/T 7714 Cui, Yufei , Niu, Chunping , Wu, Yi et al. An investigation of arc root motion by dynamic tracing method [C] . 2017 : 647-650 .
MLA Cui, Yufei et al. "An investigation of arc root motion by dynamic tracing method" . (2017) : 647-650 .
APA Cui, Yufei , Niu, Chunping , Wu, Yi , Zhu, Mingliang , Yang, Fei , Sun, Hao . An investigation of arc root motion by dynamic tracing method . (2017) : 647-650 .
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一种基于电流强制转移原理的直流混合式断路器
期刊论文 | 2014 , (10) , 32-36 | 低压电器
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Abstract :

在短路故障下,为了实现液态金属限流器高速开关触头无弧打开,提出了一种基于高速开关和液态金属限流器实现直流分断的混合式断路器拓扑结构.介绍了拓扑结构的设计原理及特点;分析了电流转移过程的操作原理;基于振荡电流源模拟故障电流对液态金属限流器的电流转移过程进行了试验研究,分析了不同因素对于液态金属限流器弧后恢复时间的影响,并确定了合适的转移起始电压.

Keyword :

弧后恢复时间 转移起始电压 高速开关 液态金属限流器

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GB/T 7714 贺开华 , 王华敏 , 任志刚 et al. 一种基于电流强制转移原理的直流混合式断路器 [J]. | 低压电器 , 2014 , (10) : 32-36 .
MLA 贺开华 et al. "一种基于电流强制转移原理的直流混合式断路器" . | 低压电器 10 (2014) : 32-36 .
APA 贺开华 , 王华敏 , 任志刚 , 吴翊 . 一种基于电流强制转移原理的直流混合式断路器 . | 低压电器 , 2014 , (10) , 32-36 .
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FEM-based calculation of short-time withstand current for air circuit breaker EI Scopus CSCD PKU
期刊论文 | 2014 , 34 (2) , 85-90 | Dianli Zidonghua Shebei/Electric Power Automation Equipment
SCOPUS Cited Count: 2
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Abstract :

The main contact system of an ACB(Air Circuit Breaker) is modeled for calculating its electro-dynamic stability and thermal stability, which applies the contact bridge model to describe the microcosmic contacting between movable and fixed contacts, the electric repulsion force and temperature rise of contacts are quantitatively analyzed and its short-time withstand current is evaluated. In electro-dynamic stability calculation, 3D transient electromagnetic analysis is used to quantitatively calculate the effect of eddy current on the electric repulsion force. In thermal stability calculation, the improved contact bridge model is applied to obtain the simulative results of transient thermal field. Two schemes, i.e. shifting shaft hole position and increasing contact ending pressure, are introduced and their effect on short-time withstand current is researched based on the established model. An optimal scheme is given.

Keyword :

Air circuit breakers Contact bridge Contact systems Electric repulsion Optimal scheme Stability calculation Temperature rise Transient electromagnetics

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GB/T 7714 Niu, Chunping , Dong, Delong , Sun, Hao et al. FEM-based calculation of short-time withstand current for air circuit breaker [J]. | Dianli Zidonghua Shebei/Electric Power Automation Equipment , 2014 , 34 (2) : 85-90 .
MLA Niu, Chunping et al. "FEM-based calculation of short-time withstand current for air circuit breaker" . | Dianli Zidonghua Shebei/Electric Power Automation Equipment 34 . 2 (2014) : 85-90 .
APA Niu, Chunping , Dong, Delong , Sun, Hao , Ning, Jiaqi , Yang, Fei , Wu, Yi et al. FEM-based calculation of short-time withstand current for air circuit breaker . | Dianli Zidonghua Shebei/Electric Power Automation Equipment , 2014 , 34 (2) , 85-90 .
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