The Experts below are selected from a list of 7212 Experts worldwide ranked by ideXlab platform
Qinglin Cheng - One of the best experts on this subject based on the ideXlab platform.
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multi objective optimization of energy consumption in crude oil pipeline transportation system operation based on Exergy Loss analysis
Neurocomputing, 2019Co-Authors: Qinglin Cheng, Yuxin Wang, Zhidong Li, Jian ZhaoAbstract:Abstract Energy consumption plays a dominant role in the technical and economic indicators of pipeline operation, and is greatly influenced by operation schemes. However, the conventional energy consumption model is often analyzed from the perspective of “energy” in the process of optimization without addressing the issue of energy quality. Based on energy quality, this paper analyzes Exergy Loss and Exergy efficiency of every component of the crude oil pipeline transportation system. The expression of the Exergy Loss is determined and the mathematical model of the pipeline transportation system is established with the optimization objective of minimizing the total Exergy Loss of the system, which is combined the two optimization algorithms of genetic algorithm and multi-objective programming. Using one external oil pipeline in northeast China as an example, the model is used to do hierarchical optimization for the equipment arrangement and operation parameters of each station in the pipeline transportation system. The results found that the total oil transportation cost and the total Exergy Loss of the pipeline transportation system after optimization have seen an obvious improvement in the effective utilization of energy when compared to pre-optimized levels. The purpose of reducing the operation energy consumption and Exergy Loss of the system as well as each subsystem simultaneously has been achieved, and the theoretical basis is provided for the energy consumption optimization of oil pipeline transportation system operations.
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studies of the unavoidable Exergy Loss rate and analysis of influence parameters for pipeline transportation process
Case Studies in Thermal Engineering, 2018Co-Authors: Qinglin Cheng, Anbo Zheng, Lu Yang, Hao Wu, Lili LvAbstract:Abstract According to the Exergy balance relationship among the various items in the crude oil transportation process system, the Exergy balance equation is established and each Exergy Loss is calculated. In a sense, the essence of Exergy analysis method relies on the calculation and the analysis of system Exergy Loss. The unavoidable Exergy Loss is defined based on the required minimum Exergy Loss from the technology standpoint during the pipeline conveying process. In order to truly reflect the degree of effective energy utilization, this article puts forward the unavoidable Exergy Loss rate as evaluation index, which is based on the Exergy analysis criterion consisted by Exergy Loss coefficient and Exergy Loss rate. Taking an oil pipeline as an example, the changes of the unavoidable Exergy Loss are studied under different designed parameters. And the unavoidable thermal Exergy Loss is the dominant position. Change situations of the unavoidable Exergy Loss rate are explored. Through analysis, the trend and the regularity of the unavoidable total Exergy Loss rate are identical with the unavoidable thermal Exergy Loss rate. Then the orthogonal experiment method is used to compare the different influence degrees to the pipeline unavoidable Exergy Loss rate. The results are as follows: diameter, insulation thickness and buried depth, which can provide the reference for the energy-saving transportation of crude oil pipeline.
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studies on energy consumption of crude oil pipeline transportation process based on the unavoidable Exergy Loss rate
Case Studies in Thermal Engineering, 2018Co-Authors: Qinglin Cheng, Anbo Zheng, Lu YangAbstract:Abstract In order to ensure the crude oil pipeline process smoothly, the driving force has a certain Exergy Loss. Based on the Exergy analysis method, according to the required minimum potential difference of pipeline transportation, the unavoidable Exergy Loss is defined in the process. In order to reflect the real effective utilization degree of energy consumption, the unavoidable Exergy Loss rate is put forward as the evaluation index. And it is calculated by the ratio of related the unavoidable Exergy Loss and the Exergy Loss. The crude oil pipeline Exergy Loss rate is calculated under different conditions. The orthogonal experiment analysis used to compare the influence degree of different operating parameters on the pipeline unavoidable Exergy Loss rate show that the influence degree on the unavoidable Exergy Loss rate in turn is: outbound temperature, flow and outbound pressure. It also provide the reference for the energy-saving transportation of crude oil pipeline.
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research on Exergy flow composition and Exergy Loss mechanisms for waxy crude oil pipeline transport processes
Energies, 2017Co-Authors: Qinglin Cheng, Wenkun Su, Ying XuAbstract:The basic theory of Exergy was used to derive the formulae of physical and chemical Exergy in the process of pipeline transportation, combined with the effect of wax deposition on the thermodynamic parameters including specific heat, density, chemical potential and concentration gradient. On the basis of this, the expression of various Exergy Losses were derived, and the Exergy balance model was then built in the process. For the case study, a waxy crude oil pipeline in China was selected. The mechanism for how wax deposition affected the physical and chemical Exergy Loss was studied through analyzing the axial pipeline distribution of pressure, temperature, flow rate and thickness of insulation layer. Finally, under the design flow of 66 × 103 kg·h−1, the orthogonal experimental analysis method was used for comparing the degree of specific factors which could influence the total Exergy efficiency. The highest Exergy efficiency combination of working conditions was then determined. This research could provide a theoretical basis for guiding safe and economic operation in the actual pipeline transportation process.
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deduction and analysis of driving Exergy Loss in oil pipeline system
Applied Mechanics and Materials, 2013Co-Authors: Qinglin Cheng, Meng Zhang, Xuxu WangAbstract:Pipeline transportation is a substance conveying process that makes crude oil flowing from first station to ultimate station and at the same time takes a certain amount of driving energy for cost. Based on related theories of engineering fluid mechanics, mathematics analytic formula of driving Exergy in oil pipeline transportation is deduced by micro-element analysis. We can get the conclusion that driving Exergy Loss has a positive correlation with diameter and throughput, and also a contrary trend with insulation thickness and outbound temperature by analyzing the influence on driving Exergy Loss from operation parameters in pipeline process,. This research can provide theoretical guidance for energy consumption classification, and further more, the technical support for energy consumption in pipeline system.
Lu Yang - One of the best experts on this subject based on the ideXlab platform.
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studies of the unavoidable Exergy Loss rate and analysis of influence parameters for pipeline transportation process
Case Studies in Thermal Engineering, 2018Co-Authors: Qinglin Cheng, Anbo Zheng, Lu Yang, Hao Wu, Lili LvAbstract:Abstract According to the Exergy balance relationship among the various items in the crude oil transportation process system, the Exergy balance equation is established and each Exergy Loss is calculated. In a sense, the essence of Exergy analysis method relies on the calculation and the analysis of system Exergy Loss. The unavoidable Exergy Loss is defined based on the required minimum Exergy Loss from the technology standpoint during the pipeline conveying process. In order to truly reflect the degree of effective energy utilization, this article puts forward the unavoidable Exergy Loss rate as evaluation index, which is based on the Exergy analysis criterion consisted by Exergy Loss coefficient and Exergy Loss rate. Taking an oil pipeline as an example, the changes of the unavoidable Exergy Loss are studied under different designed parameters. And the unavoidable thermal Exergy Loss is the dominant position. Change situations of the unavoidable Exergy Loss rate are explored. Through analysis, the trend and the regularity of the unavoidable total Exergy Loss rate are identical with the unavoidable thermal Exergy Loss rate. Then the orthogonal experiment method is used to compare the different influence degrees to the pipeline unavoidable Exergy Loss rate. The results are as follows: diameter, insulation thickness and buried depth, which can provide the reference for the energy-saving transportation of crude oil pipeline.
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studies on energy consumption of crude oil pipeline transportation process based on the unavoidable Exergy Loss rate
Case Studies in Thermal Engineering, 2018Co-Authors: Qinglin Cheng, Anbo Zheng, Lu YangAbstract:Abstract In order to ensure the crude oil pipeline process smoothly, the driving force has a certain Exergy Loss. Based on the Exergy analysis method, according to the required minimum potential difference of pipeline transportation, the unavoidable Exergy Loss is defined in the process. In order to reflect the real effective utilization degree of energy consumption, the unavoidable Exergy Loss rate is put forward as the evaluation index. And it is calculated by the ratio of related the unavoidable Exergy Loss and the Exergy Loss. The crude oil pipeline Exergy Loss rate is calculated under different conditions. The orthogonal experiment analysis used to compare the influence degree of different operating parameters on the pipeline unavoidable Exergy Loss rate show that the influence degree on the unavoidable Exergy Loss rate in turn is: outbound temperature, flow and outbound pressure. It also provide the reference for the energy-saving transportation of crude oil pipeline.
Zhixiong Li - One of the best experts on this subject based on the ideXlab platform.
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numerical simulation for turbulent flow in a tube with combined swirl flow device considering nanofluid Exergy Loss
Physica A-statistical Mechanics and Its Applications, 2020Co-Authors: Ahmad Shafee, M Sheikholeslami, Zhixiong Li, M Jafaryar, Ahmad Arabkoohsar, M Ayani, T Nguyenthoi, Baba D Basha, Iskander TliliAbstract:Abstract Helical turbulator has been adopted in this article, to enhance the convective flow within a pipe. Homogeneousmodel was carried out for nanomaterial modeling. The Reynolds number (Re) and width of turbulator (b) vary from 5000 to 15000 and 5 to 15mm, respectively. Copper oxide nanoparticles were considered as an additive in to pure carrier fluid to gain better thermal behavior. Furthermore, Exergy Loss distributions for different cases have been reported. Outputs indicate that disturbance of the boundary layer enhances with rise of b. Mixing of core nanofluid flow and boundary layer enhances with augment of width of turbulator.
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numerical investigation for second law analysis of ferrofluid inside a porous semi annulus an application of entropy generation and Exergy Loss
International Journal of Numerical Methods for Heat & Fluid Flow, 2019Co-Authors: M Sheikholeslami, Ahmad Shafee, R Ellahi, Zhixiong LiAbstract:Purpose The purpose of this paper is to present the entropy analysis of ferrofluid inside a porous space with magnetic force. Homogenous model with second law analysis is also taken into account. Design/methodology/approach Innovative model has been proposed and designed using control volume finite element method. Findings Experimental results demonstrate that Bejan number augments with augment of Rayleigh. As Hartmann number rises, Exergy Loss enhances. Exergy Loss increases by increasing Hartmann number, whereas magnetic entropy generation reduces with the decrease of Ha. The proposed model can be used for combustion process and optimizing the performance of energy conversion system like gas turbine. Originality/value To the best of authors’ knowledge, this model is reported for the first time.
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nanofluid heat transfer augmentation and Exergy Loss inside a pipe equipped with innovative turbulators
International Journal of Heat and Mass Transfer, 2018Co-Authors: M Sheikholeslami, Zhixiong Li, M Jafaryar, Ahmad Shafee, S Saleem, Yu JiangAbstract:Abstract Exergy variations for forced convection of nanofluid through a pipe equipped with twisted tape turbulators have been simulated via Finite volume method. Roles of height ratio, pitch ratio and Reynolds number on variation of nanofluid hydrothermal treatment, second law efficiency ( η II ) and Exergy Loss ( X d ) were presented. Suitable formulas for ( X d ) and ( η II ) are provided. Results reveal that Exergy drop reduces with enhance of Reynolds number and height ratio. Second law performance rises with augment of height ratio while it reduces with augment of pitch ratio.
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experimental investigation for entropy generation and Exergy Loss of nano refrigerant condensation process
International Journal of Heat and Mass Transfer, 2018Co-Authors: M Sheikholeslami, Milad Darzi, Zhixiong LiAbstract:Abstract In this research, entropy generation and Exergy Loss of nano-refrigerant condensation process inside a horizontal tube is investigated experimentally. Mixture of oil and CuO nanoparticles is added to R600a and nano-refrigerant is produced. Influences of vapor quality, mass flux, concentration of nanoparticles on entropy generation and Exergy Loss are investigated. Results indicate that increasing concentration of nanoparticles leads to increase the frictional entropy generation. Bejan number and Exergy Loss decreases with increase of vapor quality and mass flux of nanofluid.
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Exergy Loss analysis for nanofluid forced convection heat transfer in a pipe with modified turbulators
Journal of Molecular Liquids, 2018Co-Authors: M Sheikholeslami, Zhixiong Li, M Jafaryar, Davood Domairry GanjiAbstract:Abstract In this research, second law and Exergy analysis for nanofluid turbulent flow due to inserting modified turbulators has been studied. Nanofluid behavior is predicted via single phase model. Finite volume method is considered to model the governing equations. Exergy Loss and second law performance were calculated for various values of revolution angle and Reynolds number. Also good correlations have been offered according to outputs. Results indicate that second law performance is an augmenting function of revolution angle. Exergy Loss enhances with decrease of revolution angle and Reynolds number.
Shinichi Kinoshita - One of the best experts on this subject based on the ideXlab platform.
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process analysis and evaluation of Exergy Loss in solid oxide fuel cell
Jsme International Journal Series B-fluids and Thermal Engineering, 2004Co-Authors: Kousuke Nishida, Toshimi Takagi, Shinichi KinoshitaAbstract:A solid oxide fuel cell (SOFC) is expected to be applied to the distributed energy systems because of its high thermal efficiency and exhaust gas utilization. The exhaust heat from the SOFC can be transferred to the electric power by a gas turbine and the high efficiency power generation can be achieved. In this paper, the local processes in electrodes and electrolyte of unit SOFC are analyzed taking into account the heat conduction, mass diffusion, electrode reactions and transport of electron and oxygen ion. The temperature and concentration distributions in electrodes and electrolyte membrane are investigated. The effects of operating conditions on the cell performance are also shown. Furthermore, the entropy generation and Exergy Loss of each process are analyzed and the reason for generating the Exergy Loss in the SOFC is clarified. It is noted that two electrode reactions are responsible for the major Exergy Loss.
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analysis of electrochemical performance and Exergy Loss in solid oxide fuel cell
ASME Turbo Expo 2003 collocated with the 2003 International Joint Power Generation Conference, 2003Co-Authors: Kousuke Nishida, Toshimi Takagi, Shinichi KinoshitaAbstract:A solid oxide fuel cell (SOFC) is expected to be applied to the distributed energy systems because of its high thermal efficiency and exhaust gas utilization. The exhaust heat from the SOFC can be transferred to the electric power by a gas turbine, and the high efficiency power generation can be achieved by constructing the SOFC and gas turbine hybrid system. In this study, the local processes in the electrodes and electrolyte of unit SOFC are analyzed taking into account the heat conduction, mass diffusion, electrode reactions and the transport of electron and oxygen ion. The temperature and concentration distributions perpendicular to the electrolyte membrane are shown. The effects of the operating conditions on the cell performance are also shown. Furthermore, the entropy generation and Exergy Loss of each process in the electrodes and electrolyte are analyzed and the reason for generating the Exergy Loss in the SOFC is clarified. It is noted that two electrode reactions are responsible for the major Exergy Loss.Copyright © 2003 by ASME
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analysis of entropy generation and Exergy Loss during combustion
Proceedings of the Combustion Institute, 2002Co-Authors: Kousuke Nishida, Toshimi Takagi, Shinichi KinoshitaAbstract:The analysis of entropy generation and Exergy Loss is used for optimizing the performance of energy conversion systems such as gas turbines. Exergy Loss in the combustor of 20%–30% is the largest of all component Losses in the gas turbine systems. The sources of the large Exergy Loss during the combustion process can be evaluated by analyzing local entropy generation of irreversible processes. Multicomponent flow with chemical reactions such as combustion involves four irreversible processes: viscous dissipation, heat conduction, mass diffusion, and chemical reaction. In this study, we analyzed local entropy generation and Exergy Loss due to these processes in premixed and diffusion flames in order to clarify the reasons for large Exergy destruction during combustion processes, taking into account detailed chemical kinetics and multicomponent diffusion. The effects of fuels, equivalence ratio, and inlet fluid temperature on local entropy generation and Exergy Loss were evaluated for premixed flames. Chemical reaction is the dominant process for Exergy Loss in premixed flames, and the fraction of it changes in relation to the flame structure modification and temperature. On the contrary, for diffusion flames, heat conduction instead of chemical reaction is the major process for Exergy Loss.
Lili Lv - One of the best experts on this subject based on the ideXlab platform.
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studies of the unavoidable Exergy Loss rate and analysis of influence parameters for pipeline transportation process
Case Studies in Thermal Engineering, 2018Co-Authors: Qinglin Cheng, Anbo Zheng, Lu Yang, Hao Wu, Lili LvAbstract:Abstract According to the Exergy balance relationship among the various items in the crude oil transportation process system, the Exergy balance equation is established and each Exergy Loss is calculated. In a sense, the essence of Exergy analysis method relies on the calculation and the analysis of system Exergy Loss. The unavoidable Exergy Loss is defined based on the required minimum Exergy Loss from the technology standpoint during the pipeline conveying process. In order to truly reflect the degree of effective energy utilization, this article puts forward the unavoidable Exergy Loss rate as evaluation index, which is based on the Exergy analysis criterion consisted by Exergy Loss coefficient and Exergy Loss rate. Taking an oil pipeline as an example, the changes of the unavoidable Exergy Loss are studied under different designed parameters. And the unavoidable thermal Exergy Loss is the dominant position. Change situations of the unavoidable Exergy Loss rate are explored. Through analysis, the trend and the regularity of the unavoidable total Exergy Loss rate are identical with the unavoidable thermal Exergy Loss rate. Then the orthogonal experiment method is used to compare the different influence degrees to the pipeline unavoidable Exergy Loss rate. The results are as follows: diameter, insulation thickness and buried depth, which can provide the reference for the energy-saving transportation of crude oil pipeline.