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学者姓名：张红光
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摘要 ：
Frequent fluctuations of CNG engine operating conditions make the waste heat source have uncertain, nonlinear, and strong coupling characteristics. These characteristics are not conducive to the efficient recovery of the DORC system. The systematic evaluation of the CNG engine waste heat source and the comprehensive performance of the DORC system is conducive to the efficient use of waste heat. Based on the theory of internal combustion (IC) engine thermal balance, this paper analyzes the dynamic characteristics of compressed natural gas (CNG) engine waste heat energy under full operating conditions. Then, based on the operating characteristics of the dual loop organic Rankine cycle (DORC) system, thermodynamic models, heat transfer models, and economic models are constructed. The dynamic response characteristics analysis and energy, exergy, and economic (3E) evaluation of the DORC system under full operating conditions are carried out. The results show that the maximum values of net power output, heat exchange area, and the minimum values of EPC (electricity production cost) and PBT (payback time) are all obtained under rated condition, which are 174.03 kW, 25.86 kW, 37.54 kW, 24.76 m(2), 0.15 $/kW & BULL;h and 3.46 years. Therefore, the rated condition is a relatively ideal design operating point for the DORC system. The research in this paper not only provides a reliable reference for the comprehensive analysis and evaluation of the performance of the DORC system, but also provides useful guidance for the selection of appropriate DORC system design operating points.
关键词 ：
dual loop organic Rankine cycle dual loop organic Rankine cycle full operating conditions full operating conditions dynamic response characteristics dynamic response characteristics CNG engine CNG engine waste heat recovery waste heat recovery
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| GB/T 7714 | Yao, Baofeng , Ping, Xu , Zhang, Hongguang . Dynamic Response Characteristics Analysis and Energy, Exergy, and Economic (3E) Evaluation of Dual Loop Organic Rankine Cycle (DORC) for CNG Engine Waste Heat Recovery [J]. | ENERGIES , 2021 , 14 (19) . |
| MLA | Yao, Baofeng 等. "Dynamic Response Characteristics Analysis and Energy, Exergy, and Economic (3E) Evaluation of Dual Loop Organic Rankine Cycle (DORC) for CNG Engine Waste Heat Recovery" . | ENERGIES 14 . 19 (2021) . |
| APA | Yao, Baofeng , Ping, Xu , Zhang, Hongguang . Dynamic Response Characteristics Analysis and Energy, Exergy, and Economic (3E) Evaluation of Dual Loop Organic Rankine Cycle (DORC) for CNG Engine Waste Heat Recovery . | ENERGIES , 2021 , 14 (19) . |
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摘要 ：
Phase and texture evolution of the hot-deformed Sm(Co,Fe,Cu,Zr)z magnet prepared by spark plasma sintering (SPS) have been investigated. The effects of hot deformation temperature and height reduction on the phase structure and magnetic properties of the magnet were studied. The results show that with 90% height reduction at 900 °C, the hot-deformed magnet with TbCu7 structure obtains an obvious c -axis texture. However, with increasing hot deformation temperature, some 1:7H phases decompose into 2:17R, 1:5H, and Zr-rich particle phases in the hot deformation process. The hot-deformed magnet with 85% height reduction possesses a remanence ( Mr ) of 6.9 kG, which is higher than that of the isotopic precursor. © 1965-2012 IEEE.
关键词 ：
Binary alloys Binary alloys Copper alloys Copper alloys Deformation Deformation Grain size and shape Grain size and shape Magnets Magnets Spark plasma sintering Spark plasma sintering Terbium alloys Terbium alloys Textures Textures Zirconium compounds Zirconium compounds
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| GB/T 7714 | Yang, Y.Q. , Zhang, D.T. , Li, Y.Q. et al. Phase and Texture Evolution of Hot-Deformed Sm(Co,Fe,Cu,Zr)zMagnet [J]. | IEEE Transactions on Magnetics , 2021 , 57 (2) . |
| MLA | Yang, Y.Q. et al. "Phase and Texture Evolution of Hot-Deformed Sm(Co,Fe,Cu,Zr)zMagnet" . | IEEE Transactions on Magnetics 57 . 2 (2021) . |
| APA | Yang, Y.Q. , Zhang, D.T. , Li, Y.Q. , Zhang, H.G. , Liu, W.Q. , Yue, M. . Phase and Texture Evolution of Hot-Deformed Sm(Co,Fe,Cu,Zr)zMagnet . | IEEE Transactions on Magnetics , 2021 , 57 (2) . |
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摘要 ：
This study presents a free piston expander-linear generator (FPE-LG) for engine waste heat recovery. The control strategies based on displacement (control strategy A) and valve timings (control strategy B) are proposed. The operation and output characteristics with different control strategies are conducted. The results show that control strategy has significant effect on the FPE-LG performance. When FPE-LG operates with control strategy A, the operation frequency is determined by the intake pressure, advanced exhaust duration, fixed position point and external load resistance, whereas it is only related with the intake/exhaust time and advanced exhaust duration (ta) for control strategy B. The external load resistance has slight influence on the stroke length for these two control strategies. For control strategy A, when advanced exhaust duration is more than 40 ms, the stroke length rises with the intake pressure, whereas it first rises and then reduces when advanced exhaust duration is less than 40 ms. There exist the optimal external load resistance and advanced exhaust duration to achieve the maximum power output with control strategy A, whereas the average power output reduces with the increasing advanced exhaust duration when using control strategy B. Stable operation and high power output can be obtained by using different control strategies and adjusting relevant operation parameters. © 2021, Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature.
关键词 ：
Electric generators Electric generators Pistons Pistons Pressure control Pressure control Rankine cycle Rankine cycle Thermoelectric power Thermoelectric power Waste heat Waste heat Waste heat utilization Waste heat utilization
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| GB/T 7714 | Hou, Xiaochen , Zhang, Hongguang , Zhao, Tenglong et al. Study on the Control Strategy of Free Piston Expander-Linear Generator Used for Organic Rankine Cycle Waste Heat Recovery [J]. | Journal of Thermal Science , 2021 , 30 (2) : 585-597 . |
| MLA | Hou, Xiaochen et al. "Study on the Control Strategy of Free Piston Expander-Linear Generator Used for Organic Rankine Cycle Waste Heat Recovery" . | Journal of Thermal Science 30 . 2 (2021) : 585-597 . |
| APA | Hou, Xiaochen , Zhang, Hongguang , Zhao, Tenglong , Shi, Xin , Xu, Yonghong , Li, Jian et al. Study on the Control Strategy of Free Piston Expander-Linear Generator Used for Organic Rankine Cycle Waste Heat Recovery . | Journal of Thermal Science , 2021 , 30 (2) , 585-597 . |
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摘要 ：
In order to overcome the limitations of geological conditions, a test bench of small-scale compressed air energy storage (CAES) system based on pneumatic motor (PM) is proposed in this paper. As a key component of CAES system, the PM serves as an expander with the advantages of small size, lightweight, low cost, and convenient operation. The effect of the rotation speed, regulated pressure, and current on the key performance parameters (power output, compressed air consumption rate, and energy efficiency) are tested through experiments. In addition to the resulting output performance of the PM and generator, the energy efficiency of the PM, generator, and CAES system is analyzed. Given that the exhaust air from the PM has a refrigeration potential, the cooling power, cooling efficiency, and combined cooling power efficiency are also examined to improve the comprehensive energy utilization efficiency of the CAES system. The power output and energy efficiency of the PM and generator increase but eventually decrease with the rise of current and rotation speed. Under the lab-scale conditions, the maximum power output of the PM and generator are 989.21 W and 862.35 W, respectively. The maximum efficiency of the PM and generator is 9.83% and 87.19%, and the cooling efficiency and combined cooling power efficiency of the CAES system are 11.77% and 17.25%.
关键词 ：
Combined cooling power Combined cooling power Compressed air energy storage Compressed air energy storage Energy analysis Energy analysis Output performance Output performance Pneumatic motor Pneumatic motor
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| GB/T 7714 | Xu, Yonghong , Zhang, Hongguang , Yang, Fubin et al. Performance analysis of combined cooling power based on small-scale compressed air energy storage system [J]. | JOURNAL OF ENERGY STORAGE , 2021 , 44 . |
| MLA | Xu, Yonghong et al. "Performance analysis of combined cooling power based on small-scale compressed air energy storage system" . | JOURNAL OF ENERGY STORAGE 44 (2021) . |
| APA | Xu, Yonghong , Zhang, Hongguang , Yang, Fubin , Tong, Liang , Yan, Dong , Yang, Yifan et al. Performance analysis of combined cooling power based on small-scale compressed air energy storage system . | JOURNAL OF ENERGY STORAGE , 2021 , 44 . |
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摘要 ：
The output characteristics of single screw expander has a direct and crucial influence on the performance of organic Rankine cycle (ORC) system. In this paper, a machine learning prediction model driven by experimental data is developed and applied to predict the power output of single screw expander. After screening different structural parameters of the model, genetic algorithm (GA) is used to optimize the initial weights and thresholds of the model, so as to further improve the generalization ability of the model. In addition, the generalization ability of the model is compared with that of the model not optimized by GA. Furthermore, the influence of operating parameters on the power output of single screw expander is analyzed by fitting algorithm in three-dimensional space. The optimization boundary value needed for prediction and optimization is determined by fitting algorithm in four-dimensional space. Finally, a prediction and optimization model is created by coupling the machine learning prediction model with GA, and the maximum power output and corresponding operating parameters of the single screw expander under full operating conditions are predicted and optimized. The results show that with the application of machine learning and GA, the maximum power output of single screw expander can be predicted and optimized precisely under full operating conditions. So as to directly guide the selection of relevant parameters in the process of theoretical analysis and experimental research. © 2020 Elsevier Ltd
关键词 ：
Diesel engines Diesel engines Forecasting Forecasting Genetic algorithms Genetic algorithms Machine learning Machine learning Parameter estimation Parameter estimation Predictive analytics Predictive analytics Rankine cycle Rankine cycle Screws Screws Thermoelectric power Thermoelectric power Turing machines Turing machines Waste heat Waste heat Waste heat utilization Waste heat utilization
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| GB/T 7714 | Ping, Xu , Yang, Fubin , Zhang, Hongguang et al. Prediction and optimization of power output of single screw expander in organic Rankine cycle (ORC) for diesel engine waste heat recovery [J]. | Applied Thermal Engineering , 2021 , 182 . |
| MLA | Ping, Xu et al. "Prediction and optimization of power output of single screw expander in organic Rankine cycle (ORC) for diesel engine waste heat recovery" . | Applied Thermal Engineering 182 (2021) . |
| APA | Ping, Xu , Yang, Fubin , Zhang, Hongguang , Zhang, Wujie , Zhang, Jian , Song, Gege et al. Prediction and optimization of power output of single screw expander in organic Rankine cycle (ORC) for diesel engine waste heat recovery . | Applied Thermal Engineering , 2021 , 182 . |
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摘要 ：
In this study, a single-piston free-piston expander-linear generator test system for the power-electricity conversion is presented using compressed air as the working fluid. This study investigated the effect of intake time and intake pressure on the performance of the test system. Examples include the following: in-cylinder pressure, bias displacement, one-way time, indicated work, output electric energy, and work electricity conversion efficiency in a single cycle using the position-time control method with the intake position of 21and 45 mm. Result shows that: in the operational process of the test system, all values obtained when the piston runs from top dead center to bottom dead center are all different compared with those obtained when the piston runs from bottom dead center to top dead center. When the test system operates with low intake pressure and short intake time, the working chamber without a piston rod will over-expand. With the increase of intake time or intake pressure, the bias displacement, indicated work, and one-way output electric energy show an increasing trend. Moreover, the one-way time shows a decreasing trend and eventually tends to a fixed value, and the one-way work-electricity conversion efficiency initially increases and then decreases. (c) 2021 Elsevier Ltd. All rights reserved.
关键词 ：
Bias displacement Bias displacement Indicated work Indicated work One-way time One-way time Output electric energy Output electric energy Single-piston free-piston expander-linear generator Single-piston free-piston expander-linear generator Work-electricity conversion efficiency Work-electricity conversion efficiency
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| GB/T 7714 | Wu, Zhong , Zhang, Hongguang , Liu, Zhongliang et al. Experimental study on the performance of single-piston free-piston expander-linear generator [J]. | ENERGY , 2021 , 221 . |
| MLA | Wu, Zhong et al. "Experimental study on the performance of single-piston free-piston expander-linear generator" . | ENERGY 221 (2021) . |
| APA | Wu, Zhong , Zhang, Hongguang , Liu, Zhongliang , Hou, Xiaochen , Li, Jian , Yang, Fubin et al. Experimental study on the performance of single-piston free-piston expander-linear generator . | ENERGY , 2021 , 221 . |
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摘要 ：
In this paper, a free piston expander-linear generator (FPE-LG) test rig is established and the control strategy based on displacement is applied. The operation characteristic, output performance, and energy conversion efficiency of the FPE-LG are analyzed. The coefficient of equilibrium oscillation (C) is identified to evaluate the stability of the free piston assembly (FPA). Experimental results show that the FPA has best stability when fixed position point (FPP) is between 20 - 75 mm. The actual stroke and operation frequency increase with the intake pressure and load resistance. The variations of voltage and power output are in accordance with velocity. The average power output increases with intake pressure and FPP, but reduces with the advanced exhaust duration. The maximum average power output can be achieved when the load resistance is 20 Ω. The energy conversion efficiency first increases with intake pressure and then remains constant. The energy conversion efficiency reaches up to 17.5 % when intake pressure is 0.9 MPa, FPP is 40 - 55 mm, advanced exhaust duration is 0 ms, and load resistance is 20 Ω. The lower the coefficient of equilibrium oscillation is, the higher the average power output is. © 2020 Elsevier Ltd
关键词 ：
Conversion efficiency Conversion efficiency Displacement control Displacement control Electric generators Electric generators Pistons Pistons Thermoelectric power Thermoelectric power
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| GB/T 7714 | Shi, Xin , Hou, Xiaochen , Yang, Fubin et al. Analysis on operation characteristic and output performance of free piston expander-linear generator based on displacement control strategy [J]. | Applied Thermal Engineering , 2021 , 182 . |
| MLA | Shi, Xin et al. "Analysis on operation characteristic and output performance of free piston expander-linear generator based on displacement control strategy" . | Applied Thermal Engineering 182 (2021) . |
| APA | Shi, Xin , Hou, Xiaochen , Yang, Fubin , Zhang, Hongguang , Shi, Zhicheng , Zhao, Tenglong et al. Analysis on operation characteristic and output performance of free piston expander-linear generator based on displacement control strategy . | Applied Thermal Engineering , 2021 , 182 . |
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摘要 ：
Evolution of diverse Hall effects due to successive magnetic transitions has been observed in Mn2.5Fe0.6Sn0.9 by suitable chemical substitution of Fe in Mn3.1Sn0.9. This noncollinear antiferromagnetic alloy exhibits a Neel temperature of 325 K. Upon cooling from 325 K, a magnetic phase transition from noncollinear antiferromagnetism to ferromagnetism occurs at 168 K due to the tilting of magnetization towards c axis. Above this temperature, anomalous Hall resistivity ranged from 0.6 to 1.3 mu omega cm has been observed in noncollinear antiferromagnetic state. Below this temperature, a topological Hall effect (THE) starts to appear due to the non-vanishing scalar spin chirality arising from the noncoplanar spin structure. Further decreasing temperature to 132 K, another magnetic transition happens, resulting in the coexistence of ferromagnetism and antiferromagnetism, so that a Hall plateau with large hysteresis below 70 K is yielded. A hysteresis as high as similar to 80 kOe is obtained in rho(xy)-H at 15 K. However, the Hall plateau disappears and only anomalous Hall effect (AHE) persists when further decreasing the temperature to 5 K. The present study provides a picture of diverse magneto-transport properties correlated to the variable spin structures driven by magnetic phase transitions.
关键词 ：
anomalous Hall effect anomalous Hall effect non-collinear antiferromagnet non-collinear antiferromagnet topological Hall effect topological Hall effect
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| GB/T 7714 | Liu, Z. H. , Zhang, Q. Q. , Zhang, Y. J. et al. Evolution of diverse Hall effects during the successive magnetic phase transitions in Mn2.5Fe0.6Sn0.9 Kagome-lattice alloy [J]. | JOURNAL OF PHYSICS-CONDENSED MATTER , 2021 , 33 (11) . |
| MLA | Liu, Z. H. et al. "Evolution of diverse Hall effects during the successive magnetic phase transitions in Mn2.5Fe0.6Sn0.9 Kagome-lattice alloy" . | JOURNAL OF PHYSICS-CONDENSED MATTER 33 . 11 (2021) . |
| APA | Liu, Z. H. , Zhang, Q. Q. , Zhang, Y. J. , Zhang, H. G. , Ma, X. Q. , Liu, E. K. . Evolution of diverse Hall effects during the successive magnetic phase transitions in Mn2.5Fe0.6Sn0.9 Kagome-lattice alloy . | JOURNAL OF PHYSICS-CONDENSED MATTER , 2021 , 33 (11) . |
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摘要 ：
Organic Rankine cycle (ORC) can efficiently recover exhaust heat of internal combustion engines (ICEs). Evaporator is an important component that determines how much waste heat can be recovered. Enhancing heat transfer performance and reducing flow resistance of the exhaust in the evaporator can improve not only heat-to-work conversion efficiency of the ORC system but also reduce the influence of the evaporator on the operation of the ICE. Experimental results of the combined diesel engine-organic Rankine cycle (DE-ORC) system showed that the simulation model of a fin-and-tube evaporator is established via computational fluid dynamic method. The heat transfer performance and flow state of exhaust are investigated by improving the structure of the fin-and-tube evaporator under typical working conditions of the diesel engine. In addition, genetic algorithm is used to optimize the evaporator to obtain the nonuniform structure of the evaporator. Results showed that the performance of the evaporator can be improved using a star-shaped fin and appropriately selected parameters of elliptical tube. The nonuniform structural evaporator can further enhance the heat transfer performance and reduce the influence of the ORC system on the operation of the diesel engine. The optimization results demonstrated that the area goodness factor (eta) increases by 173.76% while the field synergy module average angle (theta(phi m)) and friction factor f reduces by 6.17 degrees and 56.67%, respectively. (C) 2021 Elsevier Ltd. All rights reserved.
关键词 ：
Diesel engine Diesel engine Evaporator Evaporator Heat transfer enhancement Heat transfer enhancement Organic Rankine cycle Organic Rankine cycle Structural optimization Structural optimization
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| GB/T 7714 | Zhang, Wujie , Yang, Fubin , Zhang, Hongguang et al. Numerical analysis and optimization design of fin-and-tube evaporator in organic Rankine cycle system for diesel engine waste heat recovery [J]. | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2021 , 175 . |
| MLA | Zhang, Wujie et al. "Numerical analysis and optimization design of fin-and-tube evaporator in organic Rankine cycle system for diesel engine waste heat recovery" . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 175 (2021) . |
| APA | Zhang, Wujie , Yang, Fubin , Zhang, Hongguang , Ping, Xu , Yan, Dong . Numerical analysis and optimization design of fin-and-tube evaporator in organic Rankine cycle system for diesel engine waste heat recovery . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2021 , 175 . |
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摘要 ：
The isentropic efficiency of the working fluid pump has a significant impact on the overall performance of the organic Rankine cycle (ORC) system. Based on machine learning, this paper proposes an experimental data-driven isentropic efficiency prediction model. Meanwhile, S-fold cross validation algorithm and smoothing factor circulation screening technology are used to improve the predictive ability of the model. The prediction accuracy of the optimized model and the unoptimized model are compared with each other. The influence of several operating parameters on isentropic efficiency are analyzed. In addition, with intelligent algorithm, the boundary values of operating parameters are determined. The genetic algorithm (GA) and particle swarm optimization (PSO) are combined into a GA-PSO hybrid algorithm. Subsequently, the hybrid algorithm is integrated with the machine learning model to predict and optimize the isentropic efficiency under full operating conditions. The highest isentropic efficiency reaches up to 58.73%. The prediction and optimization of the isentropic efficiency of multistage centrifugal pump under full operating conditions provides not only a useful guidance on assuming pump efficiencies in theoretical analysis, but also a meaningful reference for obtaining the optimum overall operating performance of the ORC system. (c) 2021 Elsevier Ltd. All rights reserved.
关键词 ：
Hybrid algorithm Hybrid algorithm Isentropic efficiency Isentropic efficiency Machine learning Machine learning Multistage centrifugal pump Multistage centrifugal pump Organic Rankine cycle Organic Rankine cycle
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| GB/T 7714 | Ping, Xu , Yang, Fubin , Zhang, Hongguang et al. Introducing machine learning and hybrid algorithm for prediction and optimization of multistage centrifugal pump in an ORC system [J]. | ENERGY , 2021 , 222 . |
| MLA | Ping, Xu et al. "Introducing machine learning and hybrid algorithm for prediction and optimization of multistage centrifugal pump in an ORC system" . | ENERGY 222 (2021) . |
| APA | Ping, Xu , Yang, Fubin , Zhang, Hongguang , Zhang, Jian , Zhang, Wujie , Song, Gege . Introducing machine learning and hybrid algorithm for prediction and optimization of multistage centrifugal pump in an ORC system . | ENERGY , 2021 , 222 . |
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