فهرست مطالب

Renewable Energy Research and Applications - Volume:1 Issue:1, 2019
  • Volume:1 Issue:1, 2019
  • تاریخ انتشار: 1398/08/10
  • تعداد عناوین: 6
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  • N. Mishra *, A. Jain, A. Nair, B. Khanna, S. Mitra Pages 1-9
    As the energy demand is growing and fossil fuel based energy resources are getting depleted, there has been an increased focus on the use of renewable energy resources. Wind energy is a highly suitable energy resource that can be harvested for the purpose. This research deals with the design and fabrication of novel designs as a mean to harness wind energy using a ‘Savonius’ Turbine. It is generally employed to harvest the low to very low wind speed potentials. The paper introduces a novel concept about a Ducted Savonius wind turbine where power generation can increase more than 10 folds. The paper provides experimental validation of the effect of using a converging ducted structure with a single stage and double stage configurations of a Savonius wind turbine. The paper also compares the turbine’s performance with and without endplates and compares Single Stage and Double Stage Turbine. The experiment results show that around 15% increase in tangential blade velocity in single stage rotor when end plates are used. The results of the study proves that power coefficient increases with the addition of a converging ducted structure with the Savonius wind turbine, and also with the use of endplates.
    Keywords: Savonius Turbine, Vertical Axis Wind Turbine, Endplates, Duct
  • RSR Gorla *, M. K. Pallikonda, G. Walunj Pages 11-18
    In the developed world, energy is one of the major factors and research is focusing on renewable energy. The global warming, CO2, NOX and limited fossil fuel are the research areas that are important. Renewable energy may be generated by wind, water, wave, solar and biomass. In this article, we are studying the wind energy availability for Cleveland, Ohio area. A statistical method using the Rayleigh probability distribution function is used to estimate the mean wind speed and thus calculate the annual energy output from a windmill. Furthermore, the annual energy output calculated from Rayleigh PDF is compared with the actual energy output from the observed historical data for the period 2009-2018
    Keywords: wind energy, Ohio, rayleigh
  • R. Kaushal, R. Kumar * Pages 19-26
    The paper deals with falling film heat transfer across horizontal copper tubes at different tube surface geometries, mass flow rates, heat fluxes and weight percentage of salt in water salt solution at atmospheric pressure. The falling film heat transfer coefficient is significantly affected by heat flux, film Reynolds number and water salt solution for three types of augmented tubes viz. spiral, splined and smooth. This paper considers the influence of operating parameters on heat transfer coefficient using Fuzzy-Topsis applications. The experimental results reveal that falling film heat transfer has been greatly enhanced in case of spiral tube when compared with splined and smooth tubes. The spiral tube shows significant heat transfer performance than other two tubes for a given heat flux and Reynolds number as heat flux increases surface temperature also increases and increment in surface temperature of smooth tube is greater than spiral and spline tube for given heat flux and Reynolds number. As mass flow rate increases, surface temperature of all three tubes decreases but for a given heat flux and Reynolds number smooth tube has more surface temperature than other two tubes.
    Keywords: Falling film, Heat exchanger, Enhanced tubes, Fuzzy-Topsis applications
  • A. Ahmadi *, F. Esmaeilion, A. Esmaeilion, M. A. Ehyaei, J. L. Silveira Pages 27-45
    Until 2026, the annual rate of municipal solid waste production will increase and the per capita waste generation in Iran will be 0.6 kg/person.day. In this paper, the process of conversion of waste-to-energy in Iran is investigated and the future situation is estimated. Also, the trend of waste management methods and energy production are evaluated. At the end, the benefits of the waste-to-energy process at the capital of Iran (Tehran) are observed. Waste-to-Energy (WTE) facilities in waste management are used within 3 regions of 22 metropolitan areas of Tehran and serve 950,000 citizens. With manufacturing new WTE plants in Iran, it would be possible to prevent the burning of about 15 million barrels of oil or 255⨯107 cubic meters of natural gas annually and use these fossil fuels to produce petrochemicals and export them. The associated overall expenses of WTE is also estimated in different countries at a rate of GDP between 300 and 3,000 $ per ton of MSW. By substituting WTE plants instead of oil basic plants, can reduce about 0.13 kg/kWh CO2 emissions. While most of the power plants are gas basic, that will have an increase of CO2 emissions of about 0.19 kg / kWh.
    Keywords: Energy, Solid, Waste, Incinirator
  • M. Lak Kamari *, H. Isvand, M. Alhuyi Nazari Pages 47-54
    Renewable energies are noticeably developing due to their various advantages such as low greenhouse gases emission, availability and their reducing cost trend. In order to achieve the favorable objectives in energy projects, it is crucial to consider all the related parameters affecting the decision making. Multi Criteria Decision Making (MCDM) methods are reliable and efficient tool for policy making and achieving the most appropriate solution. These approaches consider the influential factors and their relative importance in prioritizing the alternatives. Since the outcome of the MCDM approaches depend on the employed algorithm and the used criteria, this article focuses on the studies related to the applications of these methods in renewable energy technology selection. The aim of the present paper is extracting the criteria which are necessary to be used in decision making for renewable energy systems. In addition, the approaches employed for improving the performance of MCDM methods as decision making aids are represented. According to this review study, technical, economic and environmental criteria are utilized in the majority of decision making researches. Moreover, some of the studies have considered other criteria such as social and risk to achieve more reliable decision. Some ideas are represented in the reviewed researches such as integrating different methods and using fuzzy sets, instead of crisp sets, to improve the performance of the MCDM methods and reduce the uncertainties.
    Keywords: MCDM, Renewable energy, AHP, Sustainable Development
  • M. Beigzadeh, F. Pourfayaz *, S.M. Pourkiaei Pages 55-63
    The use of green buildings is increasing these days and many activities in order to improve the efficiency of this type of constructions have been done by the advancement of technology. Fuel cells are one of equipment which have been used to generate power and heat for residential buildings in recent years. For this purpose, a building in a cold region has been studied. In this study, the fuel of the fuel cell is provided from renewable fuel reforming, which is fermentation of waste and wastewater. First, a SOFC modeling has been carried out which is fed by biogas from a building waste. The modeling results of renewable-fuel fuel cell of this building have showed that 72% of electricity and 13% of the required heating could be provided using its wastes. All in all, by using biogas which has been produced from building waste, most required power and a part of required hot water could be provided and the environmental pollution is reduced by utilizing waste and trash. This will utilize all waste of the building for biofuels production and also provides major of the electricity and heating demand of the building.
    Keywords: Green buildings, fuel cells, renewable fuels, Environmental Pollution, Biogas