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International Journal of Energy Science    [3 followers]  Follow    
  This is an Open Access Journal Open Access journal
     ISSN (Print) 2218-6026 - ISSN (Online) 2304-3679
     Published by Science and Engineering Publishing Company Homepage  [46 journals]
  • Effect of Different Mediator Concentrations on Power Generation in MFC
           Using Ti-TiO2 Electrode
    • Abstract: Effect of Different Mediator Concentrations on Power Generation in MFC Using Ti-TiO2 Electrode
      Pages 9-11
      Author Ergin TaskanBestamin ÖzkayaHalil Hasa
      In this study, performance of MFC using three different mediators was investigated in terms of power density and internal resistance. Methylene blue (MB), neutral red (NR) and 2-hydroxy-1,4-naphthoquinone (HNQ)mediators were used to increase power generation in MFC with the mediator concentrations of 50, 100, 200, 300 and 400 µM. The maximum power densities were recorded as 36, 31 and 18.7 mW/m2withthe mediators of MB, NR and HNQ corresponding optimal mediator concentrations of 300, 200 and 50 µM, respectively. Further, it was observed that internal resistance changed with mediator concentration.
      PubDate: 2014-02-01
       
  • Optimum Replacement Policies of Conventional Energy Sources by Clean Ones
           Subject to Current Electricity Demand
    • Abstract: Optimum Replacement Policies of Conventional Energy Sources by Clean Ones Subject to Current Electricity Demand
      Pages 1-8
      Author NasirUddin AhmedMaryam ParsaMustapha C.E. Yagou
      Developing optimum decision policy for gradual replacement of conventional energy sources by clean ones is an important field of current research and the main concern of this article. Eight main energy sources are considered and the decision policies are formulated with the objective of minimizing the implementation and environmental costs while meeting the electricity demand during the entire plan period. The selected energy sources are Coal, Petroleum, Natural Gas, Hydropower, Wind, Solar, Geothermal and Biomass. A nonlinear dynamic Lotka-Volterra model, first introduced in Miah, Ahmed and Chowdhury [1] and later extended in Parsa, Ahmed and Yagoub [2], is used for modeling the dynamic changes in the level of electricity generation from each of the eight available energy sources. Optimal control theory is used to find the optimum decision policies for integration of renewable energy sources into the national power gird of any country. As a case study for our numerical results, official released data of United States Energy Information Administration website is used for the level of electricity generation from each of the energy sources mentioned above. Different scenarios are considered for the electricity demand. These range from U.S prediction for twenty years plan period to two percent annual growth rate for different plan periods of twenty and thirty years. The proposed methodology is general enough and hence applies to other energy problems with slight modifications based on the planner's objectives.
      PubDate: 2014-02-01
       
  • Energy Efficiency in Colombia: Trends and Challenges
    • Abstract: Energy Efficiency in Colombia: Trends and Challenges
      Pages 31-34
      Author William H. Alfonso PiñaClara Inés Pardo Martíne
      Sustainable energy is important to achieve development and welfare of population because is a key to analysis how the countries use their energy as an element that strengthens productive activities from environmental protection perspective. This study seeks to determine the progress in sustainable energy in Colombia for the last decade analysing trends and challenges of energy efficiency through some indicators to establish results, achieves, gaps and barriers in the context of the institutional and policy framework. Results of this analysis demonstrated that Colombia has achieved significant advances in this field recognizing the need to increase energy efficiency especially in the power, industrial and transport sectors. Colombian government has formulated two regulations (Law 691/2001 and Decree 3683/2003) and PROURE program with Resolution 180919/2010 to implement various measures to promote energy efficiency. However, this country has several challenges to achieve a better use of energy that decrease environmental impacts whereas it strengthens economic growth and development.
      PubDate: 2014-02-01
       
  • Microbial Fuel Cells for Energy Recovery from Waste
    • Abstract: Microbial Fuel Cells for Energy Recovery from Waste
      Pages 28-30
      Author Emre Oğuz KöroğluBestamin ÖzkayaAfşin Yusuf Çetinkay
      Microbial fuel cells (MFCs) are bioelectrochemical systems, which enable to convert chemical energy directly into electrical energy with microorganism. Studies focused on using organic materials of waste to increase power production performance. In this study two different MFC reactors were investigated to produce electricity using domestic wastewater. The highest current and power density were 1385 mA/m2 and 16 mW/m2 at Ti-TiO2/Nafion combination with 78% COD removal. Ti-TiO2/CMI7000 assemblies generated 750 mA/m2 of current densities and 5 mW/m2 of power density and HRT of 1 day was found favorable for MFC system.
      PubDate: 2014-02-01
       
  • Performance Evaluation of Biomass Cooking Devices in Household Environment
           with Various Solid Biomass Fuel
    • Abstract: Performance Evaluation of Biomass Cooking Devices in Household Environment with Various Solid Biomass Fuel
      Pages 24-27
      Author Vivek Kumar SinghR. SairamP L RavitejaA NareshR Sures
      This paper is a modest attempt towards experimental study in lab backed with field work for energy efficient cooking devices based on various solid biomass fuel. It is designed as a comparative study of these energy efficient cook stoves as opposed to traditional cook stoves in terms of their thermal efficiency, speed of cooking, fuel consumption.It will finally help in assessing the sustainability of such new technology interventions particularly for rural areas.
      PubDate: 2014-02-01
       
  • Study on PMSMs with wide Flux-weakening Speed Range for New Energy
           Electric Vehicles
    • Abstract: Study on PMSMs with wide Flux-weakening Speed Range for New Energy Electric Vehicles
      Pages 20-23
      Author Bingyi ZhangQingxu LiHao LiuGuihong Fen
      This paper analyzes the permanent magnet synchronous motor used for electric vehicle, and the influence of the built-in “V” type size parameters on direct axis inductance, quadrature axis inductance as well as PM flux linkage. The research is about the change rule of permanent magnet torque and reluctance torque. In the view of the optimal driving system, it summarizes the design method for rotor magnetic circuit structure of PMSM used for electric vehicle, and analyzes the influence on Flux Weakening ability of the main electromagnetic parameters. It also includes the design of two sets of prototype of 25 kW with different rotor structure. Experimental results of the speed regulation characteristic curve and efficiency MAP verify the feasibility of the design rules proposed in this paper.
      PubDate: 2014-02-01
       
  • The Research on the Highway Low-carbon Degrees Assessment Index System
           & Quantification Model
    • Abstract: The Research on the Highway Low-carbon Degrees Assessment Index System & Quantification Model
      Pages 16-19
      Author Shuangjian JiaoHui SongYanwei L
      With the increasing of human activities, the energy problem and environment problem are increasingly prominent, transportation industry has been concerned by the international. In the paper ahp is used to contrast different kinds of factors which affect Highway low-carbon degree to determine the weights. Fuzzy comprehensive evaluation method is applied to evaluate the degree of low-carbon road. Highway low-carbon degree evaluation system has been completed based on .NET technology.Finally, Evaluation model is verified through examples.
      PubDate: 2014-02-01
       
  • The Analysis and Research of Highway Operation Period Carbon Measurement
           Model Based on VB.net Technology
    • Abstract: The Analysis and Research of Highway Operation Period Carbon Measurement Model Based on VB.net Technology
      Pages 12-15
      Author Shuangjian JiaoHui SongYanwei LiShanghong Jian
      With the rapid development of highway construction and automotive industry, the transportation industry is one of the main carbon source. In the paper, the carbon measurement model is established through the analysis of factors of influencing highway carbon emissions. “Turner” model is used to prove the validity of the carbon measurement model. The CO2 concentration measurement software has been completed based on VB.NET technology. Finally, the carbon measurement model is verified through examples.
      PubDate: 2014-02-01
       
 
 
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