Journal of Energy最新文献_第9页

Computational Design Scheme for Wind Turbine Drive-Train Based on Lagrange Multipliers 基于拉格朗日乘法器的风电传动系计算设计方案

Journal of Energy Pub Date : 2017-11-21 DOI: 10.1155/2017/4027834

M. Saleh, A. Nada, A. El-Betar, A. El-assal

{"title":"Computational Design Scheme for Wind Turbine Drive-Train Based on Lagrange Multipliers","authors":"M. Saleh, A. Nada, A. El-Betar, A. El-assal","doi":"10.1155/2017/4027834","DOIUrl":"https://doi.org/10.1155/2017/4027834","url":null,"abstract":"The design optimization of wind turbines and their subsystems will make them competitive as an ideal alternative for energy. This paper proposed a design procedure for one of these subsystems, which is the Wind Turbine Drive-Train (WTDT). The design of the WTDT is based on the load assumptions and considered as the most significant parameter for increasing the efficiency of energy generation. In industry, these loads are supplemented by expert assumptions and manipulated to design the transmission elements. In contrary, in this work, the multibody system approach is used to estimate the static as well as dynamic loads based on the Lagrange multipliers. Lagrange multipliers are numerical parameters associated with the holonomic and nonholonomic constraints assigned in the drive-train model. The proposed scheme includes computational manipulations of kinematic constraints, mapping the generalized forces into Cartesian respective, and enactment of velocity-based constrains. Based on the dynamic model and the obtained forces, the design process of a planetary stage of WTDT is implemented with trade-off’s optimization in terms of gearing parameters. A wind turbine of 1.4 megawatts is introduced as an evaluation study of the proposed procedure, in which the main advantage is the systematic nature of designing complex systems in motion.","PeriodicalId":30572,"journal":{"name":"Journal of Energy","volume":"2 1","pages":"1-16"},"PeriodicalIF":0.0,"publicationDate":"2017-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88816285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Japan’s 2014 Strategic Energy Plan: A Planned Energy System Transition 日本2014年战略能源计划:计划中的能源系统转型

Journal of Energy Pub Date : 2017-06-12 DOI: 10.1155/2017/4107614

Jeffrey B. Kucharski, H. Unesaki

{"title":"Japan’s 2014 Strategic Energy Plan: A Planned Energy System Transition","authors":"Jeffrey B. Kucharski, H. Unesaki","doi":"10.1155/2017/4107614","DOIUrl":"https://doi.org/10.1155/2017/4107614","url":null,"abstract":"This study is a review and analysis of the Japanese government’s 2014 Strategic Energy Plan (SEP). As the first plan to be issued after the Fukushima disaster of March 2011, the 2014 plan incorporates policies that represent the most comprehensive and systematic changes ever proposed for Japan’s energy system. The study reviews the key elements of the plan, employing a framework that explains the nature and magnitude of the changes planned for Japan’s energy system and related institutions. The analysis demonstrates that the shock of the triple disaster opened up a window of opportunity in Japan’s policy environment for a fundamental change in energy policy, allowing for major reforms to the energy industrial structure and energy institutions. A unique aspect of this study is that it draws upon in-person interviews conducted with key government officials who were directly involved in the formulation of the SEP, providing new insights into Japan’s energy policy planning process and the drivers behind the planned reforms. Given the nature and magnitude of the potential changes implied in the SEP, this paper concludes that the 2014 SEP is best understood as a comprehensive blueprint toward a major planned transition of the Japanese energy system.","PeriodicalId":30572,"journal":{"name":"Journal of Energy","volume":"67 1","pages":"1-13"},"PeriodicalIF":0.0,"publicationDate":"2017-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76327495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12

Qualitative and Quantitative Analysis of Off-Shore Wind Energy Project’s Risks 海上风电项目风险的定性与定量分析

Journal of Energy Pub Date : 2017-01-01 DOI: 10.1155/2017/4205083

Sayed Amir Hamzeh Mirkheshti, M. Feshari

引用次数: 2

Modelling of Sudan’s Energy Supply, Transformation, and Demand 苏丹能源供应、转型和需求模型

Journal of Energy Pub Date : 2016-08-16 DOI: 10.1155/2016/5082678

A. Rabah, H. B. Nimer, K. R. Doud, Q. Ahmed

{"title":"Modelling of Sudan’s Energy Supply, Transformation, and Demand","authors":"A. Rabah, H. B. Nimer, K. R. Doud, Q. Ahmed","doi":"10.1155/2016/5082678","DOIUrl":"https://doi.org/10.1155/2016/5082678","url":null,"abstract":"The study aimed to develop energy flow diagram (Sankey diagram) of Sudan for the base year 2014. The developed Sankey diagram is the first of its kind in Sudan. The available energy balance for the base year 2012 is a simple line draw and did not count the energy supply by private and mixed sectors such as sugar and oil industries and marine and civil aviation. The private and mixed sectors account for about 7% of the national grid electric power. Four energy modules are developed: resources, transformation, demand, and export and import modules. The data are obtained from relevant Sudanese ministries and directorates and Sudan Central Bank. “e!Sankey 4 pro” software is used to develop the Sankey diagram. The main primary types of energy in Sudan are oil, hydro, biomass, and renewable energy. Sudan has a surplus of gasoline, petroleum coke, and biomass and deficit in electric power, gasoil, jet oil, and LPG. The surplus of gasoline is exported; however, the petroleum coke is kept as reserve. The deficit is covered by import. The overall useful energy is 76% and the loss is 24%. The useful energy is distributed among residential (38%), transportation (33%), industry (12%), services (16%), and agriculture (1%) sectors.","PeriodicalId":30572,"journal":{"name":"Journal of Energy","volume":"195 1","pages":"1-14"},"PeriodicalIF":0.0,"publicationDate":"2016-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79820989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 17

Original Framework for Optimizing Hybrid Energy Supply 优化混合能源供应的原始框架

Journal of Energy Pub Date : 2016-08-04 DOI: 10.1155/2016/8317505

A. Acakpovi

{"title":"Original Framework for Optimizing Hybrid Energy Supply","authors":"A. Acakpovi","doi":"10.1155/2016/8317505","DOIUrl":"https://doi.org/10.1155/2016/8317505","url":null,"abstract":"This paper proposes an original framework for optimizing hybrid energy systems. The recent growth of hybrid energy systems in remote areas across the world added to the increasing cost of renewable energy has triggered the inevitable development of hybrid energy systems. Hybrid energy systems always pose a problem of optimization of cost which has been approached with different perspectives in the recent past. This paper proposes a framework to guide the techniques of optimizing hybrid energy systems in general. The proposed framework comprises four stages including identification of input variables for energy generation, establishment of models of energy generation by individual sources, development of artificial intelligence, and finally summation of selected sources. A case study of a solar, wind, and hydro hybrid system was undertaken with a linear programming approach. Substantial results were obtained with regard to how load requests were constantly satisfied while minimizing the cost of electricity. The developed framework gained its originality from the fact that it has included models of individual sources of energy that even make the optimization problem more complex. This paper also has impacts on the development of policies which will encourage the integration and development of renewable energies.","PeriodicalId":30572,"journal":{"name":"Journal of Energy","volume":"12 1","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2016-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89862926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Design of a Reliable Hybrid (PV/Diesel) Power System with Energy Storage in Batteries for Remote Residential Home 基于电池储能的可靠混合(光伏/柴油)电力系统的设计

Journal of Energy Pub Date : 2016-08-02 DOI: 10.1155/2016/6278138

Vincent Anayochukwu Ani

{"title":"Design of a Reliable Hybrid (PV/Diesel) Power System with Energy Storage in Batteries for Remote Residential Home","authors":"Vincent Anayochukwu Ani","doi":"10.1155/2016/6278138","DOIUrl":"https://doi.org/10.1155/2016/6278138","url":null,"abstract":"This paper reports the experience acquired with a photovoltaic (PV) hybrid system simulated as an alternative to diesel system for a residential home located in Southern Nigeria. The hybrid system was designed to overcome the problem of climate change, to ensure a reliable supply without interruption, and to improve the overall system efficiency (by the integration of the battery bank). The system design philosophy was to maximize simplicity; hence, the system was sized using conventional simulation tool and representative insolation data. The system includes a 15 kW PV array, 21.6 kWh (3600 Ah) worth of battery storage, and a 5.4 kW (6.8 kVA) generator. The paper features a detailed analysis of the energy flows through the system and quantifies all losses caused by PV charge controller, battery storage round-trip, rectifier, and inverter conversions. In addition, simulation was run to compare PV/diesel/battery with diesel/battery and the results show that the capital cost of a PV/diesel hybrid solution with batteries is nearly three times higher than that of a generator and battery combination, but the net present cost, representing cost over the lifetime of the system, is less than one-half of the generator and battery combination.","PeriodicalId":30572,"journal":{"name":"Journal of Energy","volume":"78 1 1","pages":"1-16"},"PeriodicalIF":0.0,"publicationDate":"2016-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89534849","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 45

Effect of Subsequent Dilute Acid and Enzymatic Hydrolysis on Reducing Sugar Production from Sugarcane Bagasse and Spent Citronella Biomass 后续稀酸和酶解对甘蔗渣和废香茅生物质生产还原糖的影响

Journal of Energy Pub Date : 2016-07-31 DOI: 10.1155/2016/8506214

Robinson Timung, Narendra Naik Deshavath, V. Goud, V. V. Dasu

{"title":"Effect of Subsequent Dilute Acid and Enzymatic Hydrolysis on Reducing Sugar Production from Sugarcane Bagasse and Spent Citronella Biomass","authors":"Robinson Timung, Narendra Naik Deshavath, V. Goud, V. V. Dasu","doi":"10.1155/2016/8506214","DOIUrl":"https://doi.org/10.1155/2016/8506214","url":null,"abstract":"This work was aimed at investigating the effect of process parameters on dilute acid pretreatment and enzymatic hydrolysis of spent citronella biomass (after citronella oil extraction) and sugarcane bagasse on total reducing sugar (TRS) yield. In acid pretreatment, the parameters studied were acid concentration, temperature, and time. At the optimized condition (0.1 M H2SO4, 120°C, and 120 min), maximum TRS obtained was 452.27 mg·g−1 and 487.50 mg·g−1 for bagasse and citronella, respectively. Enzymatic hydrolysis of the pretreated biomass using Trichoderma reesei 26291 showed maximum TRS yield of 226.99 mg·g−1 for citronella and 282.85 mg·g−1 for bagasse at 10 FPU, 50°C, and 48 hr. The maximum crystallinity index (CI) of bagasse and citronella after acid pretreatment obtained from X-ray diffraction analysis was 64.41% and 56.18%, respectively. Decreased CI after enzymatic hydrolysis process to 37.28% and 34.16% for bagasse and citronella, respectively, revealed effective conversion of crystalline cellulose to glucose. SEM analysis of the untreated and treated biomass revealed significant hydrolysis of holocellulose and disruption of lignin.","PeriodicalId":30572,"journal":{"name":"Journal of Energy","volume":"32 1","pages":"1-12"},"PeriodicalIF":0.0,"publicationDate":"2016-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76615225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 53

Analysis of the Oceanic Wave Dynamics for Generation of Electrical Energy Using a Linear Generator 利用线性发电机发电的海浪动力学分析

Journal of Energy Pub Date : 2016-07-28 DOI: 10.1155/2016/3437027

Omar Farrok, Md. Rabiul Islam, Md. Rafiqul Islam Sheikh

{"title":"Analysis of the Oceanic Wave Dynamics for Generation of Electrical Energy Using a Linear Generator","authors":"Omar Farrok, Md. Rabiul Islam, Md. Rafiqul Islam Sheikh","doi":"10.1155/2016/3437027","DOIUrl":"https://doi.org/10.1155/2016/3437027","url":null,"abstract":"Electricity generation from oceanic wave depends on the wave dynamics and the behavior of the ocean. In this paper, a permanent magnet linear generator (PMLG) has been designed and analyzed for oceanic wave energy conversion. The proposed PMLG design is suitable for the point absorber type wave energy device. A mathematical model of ocean wave is presented to observe the output characteristics and performance of the PMLG with the variation of ocean waves. The generated voltage, current, power, applied force, magnetic flux linkage, and force components of the proposed PMLG have been presented for different sea wave conditions. The commercially available software package ANSYS/ANSOFT has been used to simulate the proposed PMLG by the finite element method. The magnetic flux lines, flux density, and field intensity of the proposed PMLG that greatly varies with time are presented for transient analysis. The simulation result shows the excellent features of the PMLG for constant and variable speeds related to wave conditions. These analyses help to select proper PMLG parameters for better utilization of sea wave to maximize output power.","PeriodicalId":30572,"journal":{"name":"Journal of Energy","volume":"15 1","pages":"1-14"},"PeriodicalIF":0.0,"publicationDate":"2016-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75206669","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 21

A Critical Review on Wind Turbine Power Curve Modelling Techniques and Their Applications in Wind Based Energy Systems 风力机功率曲线建模技术及其在风能系统中的应用综述

Journal of Energy Pub Date : 2016-07-26 DOI: 10.1155/2016/8519785

Vaishali Sohoni, S. Gupta, R. Nema

{"title":"A Critical Review on Wind Turbine Power Curve Modelling Techniques and Their Applications in Wind Based Energy Systems","authors":"Vaishali Sohoni, S. Gupta, R. Nema","doi":"10.1155/2016/8519785","DOIUrl":"https://doi.org/10.1155/2016/8519785","url":null,"abstract":"Power curve of a wind turbine depicts the relationship between output power and hub height wind speed and is an important characteristic of the turbine. Power curve aids in energy assessment, warranty formulations, and performance monitoring of the turbines. With the growth of wind industry, turbines are being installed in diverse climatic conditions, onshore and offshore, and in complex terrains causing significant departure of these curves from the warranted values. Accurate models of power curves can play an important role in improving the performance of wind energy based systems. This paper presents a detailed review of different approaches for modelling of the wind turbine power curve. The methodology of modelling depends upon the purpose of modelling, availability of data, and the desired accuracy. The objectives of modelling, various issues involved therein, and the standard procedure for power performance measurement with its limitations have therefore been discussed here. Modelling methods described here use data from manufacturers’ specifications and actual data from the wind farms. Classification of modelling methods, various modelling techniques available in the literature, model evaluation criteria, and application of soft computing methods for modelling are then reviewed in detail. The drawbacks of the existing methods and future scope of research are also identified.","PeriodicalId":30572,"journal":{"name":"Journal of Energy","volume":"75 1","pages":"1-18"},"PeriodicalIF":0.0,"publicationDate":"2016-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89529886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 174

Power Consumption: Base Stations of Telecommunication in Sahel Zone of Cameroon: Typology Based on the Power Consumption—Model and Energy Savings 电力消耗:喀麦隆萨赫勒地区电信基站:基于电力消耗模型和节能的类型

Journal of Energy Pub Date : 2016-07-18 DOI: 10.1155/2016/3161060

Albert Ayang, P. Ngohe-Ekam, Bossou Videme, J. Temga

引用次数: 31