Consulta: subjectFacets:"Renewable energy"
Registros recuperados: 59
Data/hora: 12/06/2024 06:38:12

Evaluación técnica de un sistema híbrido de producción de energías alternas.
Provedor de dados: 32
Autores: Hernández Bautista, Cristóbal.
El uso de las energías alternativas (eólica y fotovoltaica) presenta beneficios ambientales debido a que es menos contaminante que la energía producida con combustibles que emiten una importante cantidad de CO2 a la atmósfera. Estas energías pueden ser usadas particularmente en áreas remotas que se encuentran fuera del alcance de la red eléctrica. En México, en el 2010 habían aproximadamente 3, 836,066 personas en estas condiciones (INEGI, 2011), por lo que el objetivo del presente estudio evaluar el funcionamiento de un sistema autónomo de producción de energía fotovoltaica, un aerogenerador y un calentador solar instalados en la “Unidad de Traspatio” del Campus Montecillo del Colegio de Postgraduados. Se encontró que el sistema fotovoltaico y el...
Palavras-chave: Módulo fotovoltaico; Aerogenerador; Calentador solar; Eficiencia; Energía renovable; Renewable energy; Photovoltaic module; Wind turbine; Solar water heater; Efficiency; Hidrociencias; Maestría.
Ano: 2013
URL: http://hdl.handle.net/10521/1984

Deshidratador solar para productos agrícolas.
Provedor de dados: 32
Autores: Hernández Santana, Crescencio Alejandro.
En México un gran porcentaje de la comercialización de frutas y hortalizas se realiza en fresco. Aunque por un lado, es el tipo de producto preferido por muchos consumidores, por otro, existen excedentes que saturan el mercado, bajan los precios alarmantemente y se incrementan las perdidas. No existe la capacidad instalada en infraestructura para conservar estos productos, aún en fresco. Por lo que este trabajo propone el desarrollo de un deshidratador para productos vegetales, que permitirá alargar su vida de anaquel y transformarlo en otro producto de consumo. La culminación de este proyecto, coadyuvará a mejorar la calidad de vida y arraigo social de los pobladores en regiones de origen. Se hicieron pruebas de secado con el nopal (Opuntia ficus indica),...
Palavras-chave: Energías renovables; Deshidratación; Conservación; Vegetales; Frutas; Renewable energy; Dehydration; Preservation; Vegetables; Fruits; Maestría Tecnológica; Agroindustria.
Ano: 2010
URL: http://hdl.handle.net/10521/322

Potential of biogas production from swine manure supplemented with glycerine waste
Provedor de dados: 70
Autores: Konrad,Odorico; Koch,Fabio F.; Lumi,Marluce; Tonetto,Jaqueline F.; Bezama,Alberto.
In this study, was studied the biogas generation from swine manure, using residual glycerine supplementation. The biogas production by digestion occurred in the anaerobic batch system under mesophilic conditions (35°C), with a hydraulic retention time of 48 days. The experiment was performed with 48 samples divided into four groups, from these, one was kept as a control (without glycerin) and the other three groups were respectively supplemented with residual glycerine in the percentage of 3%, 6% and 9% of the total volume of the samples. The volume of biogas was controlled by an automated system for reading in laboratory scale and the quality of the biogas (CH4) measured from a specific sensor. The results showed that the residual glycerine has high...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biogas; Residual glycerin; Swine manure; Renewable energy.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000500004

CHEMICAL AND ENERGETIC CHARACTERISTICS OF AFRICAN SWEET SORGHUM AS A SOURCE OF BIOENERGY
Provedor de dados: 70
Autores: Caraschi,José C.; Viana,Ronaldo da S.; Moreira,Bruno R. de A.; Prates,Glaucia A.
ABSTRACT The aim of this study was to evaluate the energetic potential achieved by the application of phyto-regulators to sweet sorghum cultivars. A randomized complete block design was used. Experiments were conducted using two sweet sorghum cultivars (BRS 508 and BRS 509), fourphyto-regulators (ethephon, ethyl-trinexapac, glyphosate, and sulfometuron-methyl), and a control; four replicates were performed 70 days after sowing, at the beginning of the flowering phase of the plants, with the aid of a CO2-pressurized coastal sprayer. The plants were harvested after 40 days, with the stems being cleared at the height of the apical bud, and were subjected to grinding for the extraction of broth. The following analyses were carried out: chemical (total...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Green Energy; Bioenergy; Biofuel; Renewable energy.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000400426

RESIDUAL BIOMASSES IN THE MICRO-REGION OF DOURADOS (MS): ASSESSMENT AND AVAILABILITY FOR ENERGY IN AGRICULTURE THERMAL CONVERSION
Provedor de dados: 70
Autores: Silva,Robson L. da; Paula,Isabele O. de; Patelli Júnior,José R.; Torres,Tainara R. C.; Pereira,Thiago V.
ABSTRACT This research presents results of the assessment of solid biofuels (residual biomasses from agricultural crops) in the state of Mato Grosso do Sul, in the period 2007-2012, for energy in agricultural uses. It is pointed out the available quantity, its geographic location at micro and meso regions and energy conversion potential. The methodology is based on a survey on municipal agricultural production of the Brazilian Institute for Geography and Statistics (quantity and local availability, per year) followed by determination of the amounts of agricultural assessed residues, and then applying equations from the literature to estimate the amount of energy (J) and power (kW) obtained from the thermal conversion of residual biomasses. Results are...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Renewable energy; Solid biofuels; Combustion; Torrefaction; Powerplants.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000300433

How to model social-ecological systems? – A case study on the effects of a future offshore wind farm on the local society and ecosystem, and whether social compensation matters
Provedor de dados: 5
Autores: Haraldsson, Matilda; Raoux, Aurore; Riera, Fabien; Hay, Julien; Dambacher, Jeffrey M.; Niquil, Nathalie.
Models of social-ecological systems (SES) are acknowledged as an important tool to understand human-nature relations. However, many SES models fail to integrate adequate information from both the human and ecological subsystems. With an example model of a future Offshore Wind Farm development and its effects on both the ecosystem and local human population, we illustrate a method facilitating a “balanced” SES model, in terms of including information from both subsystems. We use qualitative mathematical modeling, which allows to quickly analyze the structure and dynamics of a system without including quantitative data, and therefore to compare alternative system structures based on different understandings of how the system works. By including similar...
Tipo: Text
Palavras-chave: Network; Renewable energy; Eastern English channel; Perception; Qualitative modeling; Acceptance.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00631/74300/73944.pdf

La compensation au service de l’acceptabilité sociale : un état de l’art des apports empiriques et du débat scientifique. Réflexions au service du développement de l’énergie éolienne en mer
Provedor de dados: 5
Autores: Kermagoret, Charlene; Levrel, Harold; Carlier, Antoine.
The Energy Transition involves governance issues which need to be overcome to ensure its success. In Europe, the policies that accompany this energy transition have fixed very short term goals such as the diversification and the development of renewable energy sources by 2020. The benefits of developing these technologies for limiting greenhouse gases emissions is widely accepted at European and national level and is frequently invoked by the State for legitimizing the current projects. However, many projects declared of public interest by the State lead to conflicts, at the territorial level, between the objective of economic development, and those of biodiversity conservation and of social interests protection. In this context, the compensation is often...
Tipo: Text
Palavras-chave: Principe de compensation; Restauration écologique; Indemnisation financière; Acceptabilité sociale; Énergies renouvelables; Transition énergétique; Compensation principle; Ecological restoration; Financial indemnity; Social acceptability; Renewable energy; Energetic transition.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00313/42431/41774.pdf

Variation that can be expected when using particle tracking models in connectivity studies
Provedor de dados: 5
Autores: Hufnagl, Marc; Payne, Mark; Lacroix, Genevieve; Bolle, Loes J.; Daewele, Ute; Dickey-collas, Mark; Gerkema, Theo; Huret, Martin; Janssen, Frank; Kreus, Markus; Paetsch, Johannes; Pohlmann, Thomas; Ruardij, Piet; Schrum, Corinna; Skogen, Morten D.; Tiessen, Meinard C. H.; Petitgas, Pierre; Van Beek, Jan K. L.; Van Der Veer, Henk W.; Callies, Ulrich.
Hydrodynamic Ocean Circulation Models and Lagrangian particle tracking models are valuable tools e.g. in coastal ecology to identify the connectivity between offshore spawning and coastal nursery areas of commercially important fish, for risk assessment and more for defining or evaluating marine protected areas. Most studies are based on only one model and do not provide levels of uncertainty. Here this uncertainty was addressed by applying a suite of 11 North Sea models to test what variability can be expected concerning connectivity. Different notional test cases were calculated related to three important and well-studied North Sea fish species: herring (Clupea harengus), and the flatfishes sole (Solea solea) and plaice (Pleuronectes platessa). For sole...
Tipo: Text
Palavras-chave: Ocean circulation; Lagrangian approach; Variability; Marine protected areas; Renewable energy; Wind park; Model intercomparison; Ensemble.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00385/49660/50198.pdf

Étude expérimentale des performances d’une hydrolienne, soumise aux effets de la turbulence et de l’interaction houle-courant
Provedor de dados: 5
Autores: Gaurier, Benoit.
In the context of global warming, the extraction of energy by tidal turbines from marine currents must be integrated into the future energetic mix. Being confronted with a difficult marine environment, it is required to know the turbines’ behaviour when they are submitted to realistic solicitations to guarantee an optimal use. In this work, the marine turbine performance is studied when the machine is submitted to a turbulent current or a combined wave-current effect. The physical representation of trials at reduced scale is first described focusing on the incoming flow characterisation and its effects on a turbine model at 1:20 scale. The location and measurement type of the upstream velocity are discussed to accurately define its performance and its...
Tipo: Text
Palavras-chave: Hydrolienne; Énergie marine renouvelable; Essais expérimentaux; PIV; LDV; Turbulence; Interaction houle-courant; Horizontal axis tidal turbine; Renewable energy; Experimental trials; PIV; LDV; Turbulence; Wave-current interaction.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00660/77197/78624.pdf

Dynamic behaviour of an undulating membrane tidal energy converter under wave and current loading
Provedor de dados: 5
Autores: Träsch, Martin; Delacroix, Sylvain; Déporte, Astrid; Drevet, Jean-baptiste; Gaurier, Benoit; Germain, Gregory.
The dynamic behaviour of an undulating tidal energy converter under wave and current loadings is studied. Therefore, a small scale prototype of a damped pre-stressed undulating membrane is tested in a wave and current recirculatory tank. The membrane’s dynamic profile and hydrodynamic forces are measured synchronously with the surface elevation for both regular and irregular waves in current direction. Spectrum analysis reveals that the response to wave loading depends on the wave frequency and is reduced by damping-type power take-off. Coupling between the wave frequency and the main undulation frequency or its harmonics is also observed. An increase of 30% of the forces must be foreseen in case of wave condition in the tested range.
Tipo: Text
Palavras-chave: Fluid-structure interaction; Renewable energy; Tidal energy; Undulating membrane; Flume tank; Wave-current interaction.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00623/73485/72834.pdf

Potential and participation of forests in the energy matrix
Provedor de dados: 190
Autores: Moreira, José Mauro Magalhães Ávila Paz.
Mankind is seeking to increase the use of renewable energy sources on the world energetic matrix, aiming on Green House Gas Emissions (GHGE) reduction. Biomass potential for energy generation studies, including forest products and residues, have been conducted worldwide, showing great potential. Besides, wood energy uses contribute to GHGE reduction, and is a locally available energy source at competitive costs in many countries. The proportion of fuelwood on Brazilian energy matrix has decreased over the last four decades, nevertheless consumption has increased during the last ten years. South and Northeast regions are the biggest fuelwood producers in Brazil, Southeast is the main producers of wood charcoal. In order to increase forest biomass potential...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Renewable energy; Forest biomass; Energetic forests. Energia renovável  Biomassa florestal  Florestas energéticas.
Ano: 2011
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/287

Potential of forestry residue briquetting of Seridó region species in Rio Grande do Norte State, Brazil
Provedor de dados: 190
Autores: Santos, Rosimeire Cavalcante dos; Carneiro, Angélica de Cássia Oliveira; Castro, Renato Vinícius Oliveira; Pimenta, Alexandre Santos; Castro, Ana Flávia Neves Mendes; Marinho, Itaragil Venâncio; Boas, Mariana Almeida Villas.
This study aimed to evaluate the potential use of waste generated by forestry species that occur in semiarid northeastern at Seridó region, Rio Grande do Norte, for the briquettes production, determine the physical and mechanical briquettes properties, and to correlate the wood density with the density after the briquettes production and briquettes density with the compressive strength. Thirty-two trees were collected (eight species with four replications). The wood physical and chemical properties evaluation were held under a completely randomized design. For the variables related to briquette, it was adopted the same design with three replicates for each species, totalizing 24 sampling units. The briquettes produced with jurema-preta wood stood out as a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forest residues; Briquetting; Renewable energy; Semi-arid Brazilian region Resíduos florestais; Briquetagem; Energia renovável; Região semiárida brasileira.
Ano: 2011
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/292

Mass and energy balance of the carbonization of babassu nutshell as affected by temperature
Provedor de dados: 86
Autores: Protásio,Thiago de Paula; Trugilho,Paulo Fernando; Napoli,Alfredo; Silva,Marcela Gomes da; Couto,Allan Motta.
The objective of this work was to evaluate the carbonization yield of babassu nutshell as affected by final temperature, as well as the energy losses involved in the process. Three layers constituting the babassu nut, that is, the epicarp, mesocarp and endocarp, were used together. The material was carbonized, considering the following final temperatures: 450, 550, 650, 750, and 850ºC. The following were evaluated: energy and charcoal yields, pyroligneous liquid, non-condensable gases, and fixed carbon. The use of babassu nutshell can be highly feasible for charcoal production. The yield of charcoal from babassu nutshell carbonization was higher than that reported in the literature for Eucalyptus wood carbonization, considering the final temperature of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alternative biomass; Charcoal; Iron industry; Renewable energy.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2014000300189

Energy, Agriculture, and GHG Emissions: The Role of Agriculture in Alternative Energy Production and GHG Emission Reduction in North Dakota
Provedor de dados: 31
Autores: Aravindhakshan,   Sijesh C.; Koo,   Won W.
Energy, agriculture, and GHG emissions are highly interrelated. Several agricultural commodities are currently used as feedstock for biofuel production to replace fossil fuels. As the largest consumer of energy, the U.S. has taken several initiatives to reduce the use of fossil fuels, achieve energy security, and reduce GHG emissions. The industrial community of the U.S. invested heavily in biofuel and wind energy production. North Dakota has highest potential in producing wind energy and biomass from dedicated energy crops. Unfortunately these resources are not fully utilized for producing renewable energy. North Dakota is an energy intensive economy and per capita energy consumption is higher than other states. This technical bulletin provides a...
Tipo: Report
Palavras-chave: Renewable energy; Wind power; Ethanol; Greenhouse gas emissions; Agriculture; Agribusiness; Resource /Energy Economics and Policy.
Ano: 2011
URL: http://purl.umn.edu/101222

CRITICAL ECONOMIC FACTORS FOR SUCCESS OF A BIOMASS CONVERSION PLANT FOR AGRICULTURAL RESIDUE, YARD RESIDUE AND WOOD WASTE IN FLORIDA
Provedor de dados: 31
Autores: Granja,   Ivan R.; VanSickle,   John J.; Ingram,   Lonnie; Weldon,   Richard N.
This model evaluates the potential success of a cellulosic ethanol plant in Florida. Critical Economic factors of the plant were simulated to assess the ability of this project. These critical factors include the feedstock to be used, the cost of the facility, transportation costs and the discount rate for the net present value (NPV). Results and observations are presented in this paper.
Tipo: Conference Paper or Presentation
Palavras-chave: Biofuels; Renewable energy; Cellulosic ethanol; Biomass; Agribusiness; Community/Rural/Urban Development; Crop Production/Industries; Financial Economics; Production Economics; Productivity Analysis; Resource /Energy Economics and Policy; Risk and Uncertainty.
Ano: 2010
URL: http://purl.umn.edu/56442

ENERGIA RENOVÁVEL: UMA ANÁLISE SOBRE OFERTA E DEMANDA DE ETANOL NO BRASIL
Provedor de dados: 31
Autores: Oliveira,   Michelle Pinto; Alencar,   Junia Rodrigues de; Souza,   Geraldo da Silva e.
A grande necessidade de diminuir a dependência em relação ao petróleo devido aos seus preços em constante elevação, a preocupação com o meio ambiente (protocolo de kyoto) e a crescente demanda por carros flex tem colocado o etanol - uma energia totalmente renovável - em papel de destaque, como fonte alternativa de energia. A demanda e a oferta por este biocombustível são crescentes nos últimos anos e com grande possibilidade de se manter forte e dinâmica por vários anos. Neste contexto, o estudo teve como objetivo analisar quais as variáveis que afetaram a oferta e a demanda de etanol no Brasil, no período de 1995 a 2006. O método de análise utilizado foi o modelo de equilíbrio simultâneo por meio de mínimos quadrados em dois estágios, com correção de...
Tipo: Conference Paper or Presentation
Palavras-chave: Etanol; Energia renovável; Biocombustível; Oferta e demanda; Equações simultâneas; Ethanol; Renewable energy; Biofuel; Supply; Demand; Simultaneous equations; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/108835

Wind Power Development: Opportunities and Challenges
Provedor de dados: 31
Autores: van Kooten,   G. Cornelis; Timilsina,   Govinda R.
In this study, the prospects of wind power at the global level are reviewed. Existing studies indicate that the earth’s wind energy supply potential significantly exceeds global energy demand. Yet, only 1% of the global electricity demand is currently derived from wind power despite 40% annual growth in wind generating capacity over the last 25 years. More than 98% of total current wind power capacity is installed in the developed countries plus China and India. Existing studies estimate that wind power could supply 7% to 34% of global electricity needs by 2050. Wind power faces a large number of technical, financial, institutional, market and other barriers. To overcome these, many countries have employed various policy instruments, including capital...
Tipo: Working or Discussion Paper
Palavras-chave: Wind energy; Renewable energy; Electricity grids; Resource /Energy Economics and Policy; Q25; Q32; Q42; Q48.
Ano: 2008
URL: http://purl.umn.edu/45665

IFECO – Modelling the Agro-Fuel Chain for Energy Cogeneration
Provedor de dados: 31
Autores: Rosa,   Franco.
Policy makers are searching for viable strategies to produce alternative energies; the agricultural sector can become an important supplier of renewable energy. The paper will develop the IFECO (integrated farm energy cogeneration) approach, a conceptual model of farm though as it were an "island economy"a a net energy exporter as the energy output exceeds the direct energy (cultivation, cropping, plant protection, transport, harvesting, storage) and indirect energy (fertilizer, pesticide, machinery, plantationforce, others) used in sunflower cultivation. IFECO is based on the cogeneration that is the production of different energies from a single agricultural commodity to achieve the three targets that make this project sustainable: i) economic...
Tipo: Conference Paper or Presentation
Palavras-chave: IFECO; Renewable energy; Biodiesel; Cogeneration; Sunflower; Simulation; Agribusiness; Resource /Energy Economics and Policy.
Ano: 2007
URL: http://purl.umn.edu/6578

HŐHASZNOSÍTÁSÚ BIOMASSZA POTENCIÁL HEVES MEGYÉBEN
Provedor de dados: 31
Autores: Gergely,   Sandor.
Az Európai Unióban 2004-ben 13,9% a nem fosszilis, megújuló energiahor-dozók részaránya az energiatermelésben, amelyet 2010-re 22,1%-ra terveznek emelni. Hazánkban ez az arány 2004-ben 0,9%, amelyet 2010-re 3,6%-ra kellene emelnünk; ezt vállaltuk csatlakozásunkkor. A következő hat évben négyszeresére kell növelni a megújuló energiahordozók termelését, felhasználását.  Heves megyében is egyre nagyobb jelentőségre tesz szert az a törekvés, hogy növekvő energiaigényét minél kedvezőbb áron tudják kielégíteni. Az imént emlí-tett mindkét alapvető szempontnak megfelel az, ha minél teljesebb mértékben hasznosítják a megyékben található biomassza energetikai tartalékokat. A szerző irányításával a Károly Róbert Főiskola kutatói, oktatói a Gyöngyös Körzete Kistérség...
Tipo: Journal Article
Palavras-chave: Megújuló energia; Energia-erdő program; Gyöngyös kistérség; Renewable energy; Energy-forest programme; Gyöngyös District; Agricultural and Food Policy; Environmental Economics and Policy; Production Economics.
Ano: 2005
URL: http://purl.umn.edu/54852

The Economic and Policy Setting of Renewable Energy: Where Do Things Stand?
Provedor de dados: 31
Autores: Darmstadter,   Joel.
This paper looks at the status and prospects of renewables-with particular emphasis on windpower-in the electric power sector. Although renewables account for a steadily rising share of electricity generation in various countries, their role remains small in absolute terms. In part, this is because of technological progress of and successful competition from fossil-fueled generation-notably, combined cycle gas turbines. While diminishing, subsidies continue to be indispensable to the use of renewables in most places. Viability of renewables-based electricity is undermined by the cost of externalities for which fossil energy combustion is only partially charged. A number of countries (and states in the U.S.) have launched obligatory requirements for...
Tipo: Working or Discussion Paper
Palavras-chave: Renewable energy; Electricity; Windpower; Externalities; Environmental Economics and Policy; Q21; L94.
Ano: 2003
URL: http://purl.umn.edu/10777

Renewable Energy Development and Implications to Agricultural Viability
Provedor de dados: 31
Autores: Adelaja,   Adesoji O.; Hailu,   Yohannes G.
Food and energy security have increasingly acquired key natural resource policy focus. As alternative energy solutions become more land intensive, the potential implication to the agricultural sector becomes of policy interest. This study investigated the impact of projected wind energy development in Michigan on the agricultural sector. Results indicate that land lease payments overtime for wind turbine siting are expected to generate $50 million per year, impacting agricultural viability. Spatial distribution analysis suggests that most of the projected lease payments to farmers are concentrated in low value agricultural land, low value agricultural production, urban influenced, and low net farm income locations. We found that the spatial distribution of...
Tipo: Conference Paper or Presentation
Palavras-chave: Agricultural viability; Renewable energy; Land use; Spatial analysis; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/6132

Integrating Wind Power in Electricity Grids: An Economic Analysis
Provedor de dados: 31
Autores: Liu,   Jia; van Kooten,   G. Cornelis; Pitt,   Lawrence.
As a renewable energy source, wind power is gaining popularity as a favoured alternative to fossil fuel, nuclear and hydro power generation. In Europe, countries are required to achieve 15% of their energy consumption from wind by 2010 as the EU strives to meet its Kyoto obligations. Wind power is considered to be environmentally friendly and low cost. While environmental friendliness has come under scrutiny because wind turbines continue to pose a hazard to birds, are visually unappealing, affect the uses of land and change air flows, the purpose of this paper is to examine the question of its presumed low cost and effectiveness at reducing CO2 emissions by replacing power generated from fossil fuels. To do so, we develop a mathematical programming model...
Tipo: Working or Discussion Paper
Palavras-chave: Renewable energy; Wind and nuclear power; Economics of power generation; Environmental Economics and Policy; Resource /Energy Economics and Policy; C61; Q40; Q54; Q55.
Ano: 2005
URL: http://purl.umn.edu/37010

Farmer Willingness to Supply Poultry Litter for Energy Conversion and to Invest in an Energy Conversion Cooperative
Provedor de dados: 31
Autores: Jensen,   Kimberly L.; Roberts,   Roland K.; Bazen,   Ernest F.; Menard,   R. Jamey; English,   Burton C.
Conversion of poultry litter to energy can serve as a renewable energy source and provide an alternative to land application in areas where poultry production is intensive. Economies of size may limit a farmer’s ability to economically use on-farm conversion. Capital costs can be spread across several poultry farmers to convert poultry litter to energy in a centralized facility. This research determined influences on the amount of litter poultry producers will to sell to a centralized conversion facility, on their willingness to invest in a conversion cooperative, and on the prices for litter required to divert litter from current uses.
Tipo: Journal Article
Palavras-chave: Poultry litter; Supply; Renewable energy; Agribusiness; Agricultural Finance; Farm Management; Financial Economics; Resource /Energy Economics and Policy; Q12; Q13.
Ano: 2010
URL: http://purl.umn.edu/57156

A megújuló energiaforrások szerepe és hatásai a hazai agrárgazdaságban
Provedor de dados: 31
Autores: Magda,   Robert.
Összességében megállapítható, hogy Magyarországon az elmúlt fél évszázadban rendkívül megnőtt az energiafelhasználás, ami többnyire a fosszilis tüzelőanyagokból nyert energiára alapult. Ez arra készteti a jelen és a jövő kor társadalmát, hogy törekedjen a rendelkezésre álló megújuló energiaforrások felhasználásának előtérbe helyezésére, melyek használata a fenntarthatóság és a versenyképesség szempontjából sem elhanyagolható, hiszen ismert, hogy napjaink egyik kritikus költségtényezőjét adják az energiaköltségek. A megoldásban jelentős szerep hárul a vidéki társadalmakra, mert hiába történik az energiafelhasználás zöme az urbanizált területeken, az energia-előállítás, kitermelés a vidékre koncentrálódik. A fosszilis tüzelőanyagok korlátaiból adódóan új...
Tipo: Article
Palavras-chave: Energiafüggőség; Megújuló energiahordozók; Biomassza; Foglalkoztatás; Energy dependence; Renewable energy; Biomass; Employment; Community/Rural/Urban Development; Labor and Human Capital.
Ano: 2011
URL: http://purl.umn.edu/119936

The Economics of Tidal Stream Power
Provedor de dados: 31
Autores: Boronowski,   S.; Monahan,   K.; van Kooten,   G. Cornelis.
Renewable solar, tidal and wind energy have the potential of reducing dependency on fossil fuels and their environmentally negative impacts. Because of their variability, wind and solar energy in particular impose added costs on electrical grids as system operators attempt to balance operation of existing thermal power plants. In this regard, tidal stream power has an advantage over solar and wind energy as tides are predictable and comparatively regular; yet, tides remain intermittent and thereby still may create inefficiencies to the grid. In this paper, we develop a dynamic optimization framework for analyzing the allocation of power output across generating sources when tidal and wind power are added to the system. In particular, we minimize the cost...
Tipo: Conference Paper or Presentation
Palavras-chave: Renewable energy; Electrical grids; Mathematical programming models; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/44260

Winner, Loser, or Innocent Victim? Has Renewable Energy Performed As Expected?
Provedor de dados: 31
Autores: McVeigh,   James; Burtraw,   Dallas; Darmstadter,   Joel; Palmer,   Karen L.
This study provides an evaluation of the performance of five renewable energy technologies used to generate electricity: biomass, geothermal, solar photovoltaics, solar thermal, and wind. We compared the actual performance of these technologies against stated projections that helped shape public policy goals over the last three decades. Our findings document a significant difference between the success of renewable technologies in penetrating the U.S. electricity generation market and in meeting cost-related goals, when compared with historic projections. In general, renewable technologies have failed to meet expectations with respect to market penetration. They have succeeded, however, in meeting or exceeding expectations with respect to their cost. To a...
Tipo: Working or Discussion Paper
Palavras-chave: Renewable energy; Regulation; Electricity generation; Energy cost; Environmental Economics and Policy; Q42; L94.
Ano: 1999
URL: http://purl.umn.edu/10627

RENEWABLE ENERGY AND ITS IMPACT ON AGRICULTURAL AND RURAL DEVELOPMENT: FINDINGS OF A COMPARATIVE STUDY IN CENTRAL, EASTERN AND SOUTHERN EUROPE
Provedor de dados: 31
Autores: Wolz,   Axel; Buchenrieder,   Gertrud; Markus,   Richard.
Rising energy prices for fossil fuels, the unreliable supply of energy imports during the last winters and – concerning the 12 new members states (NMS) – the demand by the European Union (EU) for developing National Renewable Energy Action Plans have stimulated the national discussion and political action on renewable energy (RE) among all European countries. Particularly among the 12 NMS the share of RE has increased during the last years. Among the candidate and potential candidate countries (CC and PCC) the discussion on RE has just started. When looking at the impact of RE on agricultural and rural development the effects are relatively small. An expansion of rape seed cultivation and, to a smaller extent, of the production of wood pellets could be...
Tipo: Working or Discussion Paper
Palavras-chave: Renewable energy; Comparative survey; Agricultural and rural development; New members states of the EU; Candidate and potential candidate countries.; Community/Rural/Urban Development; Institutional and Behavioral Economics; International Development; Political Economy; Public Economics; Resource /Energy Economics and Policy; O52; Q10; Q28; Q42; R11.
Ano: 2010
URL: http://purl.umn.edu/94719

Economic feasibility of converting cow manure to electricity: A case study of the CVPS Cow Power program in Vermont
Provedor de dados: 31
Autores: Wang,   Qingbin; Thompson,   Ethan; Parsons,   Robert L.; Rogers,   Glenn.
A case study of the Central Vermont Public Service Corporation (CVPS) Cow Power program examines the economic feasibility for dairy farms to convert cow manure into electricity via anaerobic methane digestion. The study confirms that it is technically feasible to convert cow manure to electricity on dairy farms but the economic returns highly depend on the base electricity price paid by CVPS, premium rate paid by CVPS customers, financial supports from government agencies and other organizations, and sales of the by-products of methane generation. Lessons learned from this program will be useful to other dairy farms and communities interested in converting cow manure into electricity.
Tipo: Conference Paper or Presentation
Palavras-chave: Anaerobic digestion; Dairy farms; Renewable energy; Economic feasibility; Vermont.; Agricultural Finance; Consumer/Household Economics; Demand and Price Analysis; Environmental Economics and Policy; Farm Management; Research and Development/Tech Change/Emerging Technologies.
Ano: 2011
URL: http://purl.umn.edu/104564

Environmental and Technology Policies for Climate Change and Renewable Energy
Provedor de dados: 31
Autores: Fischer,   Carolyn; Newell,   Richard G.
We assess different policies for reducing carbon dioxide (CO2) emissions and promoting the innovation and diffusion of CO2-reducing power technologies: (1) emissions price, (2) tax on fossil power, (3) tradable emissions performance standard, (4) market share requirement for renewables, (5) renewables production subsidy, and (6) R&amp;D subsidy for renewables. We evaluate the relative performance of the policies according to incentives they provide along different avenues for emissions reduction, their efficiency, and other salient outcomes. We also assess how the nature of technological progress-whether it occurs by learning by doing or R&amp;D investment and the degree of knowledge spillovers -affects the desirability of different policies. In a...
Tipo: Working or Discussion Paper
Palavras-chave: Environment; Technology; Policy instruments; Climate change; Renewable energy; Environmental Economics and Policy; Q21; Q28; Q48; O38.
Ano: 2005
URL: http://purl.umn.edu/10789

Design of substrate supply contracts for biogas plants
Provedor de dados: 31
Autores: Reise,   Christian; Liebe,   Ulf; Musshoff,   Oliver.
For a sustainable development of energy production in biogas plants, the continuous supply with substrates is essential. To the authors’ knowledge, there have not been carried out any quantitative investigations of farmers’ choices with regard to supply contracts for biogas plants. Thus, it has been only possible to a limited extent to make predictions for a targeted design of supply contracts. We therefore investigated different factors, which might be relevant for the conclusion of substrate supply contracts, by conducting a survey with 178 German farmers. The survey included a choice experiment, in which participants were confronted with different contract attributes (features). These attributes were varied systematically and thus revealed the influence...
Tipo: Presentation
Palavras-chave: Renewable energy; Bioenergy; Substrate supply contract; Contract design; (labeled) choice experiment; Resource /Energy Economics and Policy.
Ano: 2012
URL: http://purl.umn.edu/124428

Natural Gas, Wind and Nuclear Options for Generating Electricity in a Carbon Constrained World
Provedor de dados: 31
Autores: van Kooten,   G. Cornelis.
A linear programming model is used to examine the impact of carbon taxes on the optimal generation mix in the Alberta electrical system. The model permits decommissioning of generating assets with high carbon dioxide emissions and investment in new gas-fired, wind and, in some scenarios, nuclear capacity. Although there is an intertie from Alberta to the U.S., the focus is on the connection to British Columbia as wind energy can potentially be stored in reservoirs behind hydroelectric dams. However, storage can also be used to smooth out the net load facing nuclear facilities. A carbon tax facilitates early removal of coal-fired capacity, which is replaced by low-emissions gas plants. It is only when the carbon tax exceeds $125/tCO2 that wind enters the...
Tipo: Working Paper
Palavras-chave: Renewable energy; Nuclear power; Transmission capacity; Energy storage; Resource /Energy Economics and Policy; Q42; Q54; Q48; Q58.
Ano: 2012
URL: http://purl.umn.edu/122353

Cost-Effectiveness of Renewable Electricity Policies
Provedor de dados: 31
Autores: Palmer,   Karen L.; Burtraw,   Dallas.
We analyze policies to promote renewable sources of electricity. A renewable portfolio standard raises electricity prices and primarily reduces gas-fired generation. A "knee" of the cost curve exists between 15% and 20% goals for 2020 in our central case, and higher natural gas prices lower the cost of greater reliance on renewables. A renewable energy production tax credit lowers electricity price at the expense of taxpayers and thus limits its effectiveness in reducing carbon emissions; it also is less cost-effective at increasing renewables than a portfolio standard. Neither policy is as cost-effective as a cap-and-trade policy for achieving carbon emissions reductions.
Tipo: Working or Discussion Paper
Palavras-chave: Renewable energy; Electricity; Renewable portfolio standard; Carbon dioxide; Resource /Energy Economics and Policy; Q42; Q48; Q54.
Ano: 2005
URL: http://purl.umn.edu/10845

Development of the World Fuel Ethanol Industry
Provedor de dados: 31
Autores: Wang,   Suya.
This paper summarizes the developmental courses of fuel ethanol in the world. Then, it analyzes the existing problems and developmental prospects of fuel ethanol.
Tipo: Thesis or Dissertation
Palavras-chave: Energy crisis; Environmental pressure; Renewable energy; Fuel ethanol; Environmental Economics and Policy; International Development; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/53522

Schnellwachsende Baumarten - Chance fur zusatzliches Einkommen im landlichen Raum?
Provedor de dados: 31
Autores: Pallast,   Gregor; Breuer,   Thomas; Holm-Muller,   Karin.
Based on previous experiences with the cultivation of short Rotation Coppice in Germany, the present article deals with the profitability of tree-plantations for bio-energy generation. The production process is divided into several steps in order to compare the resulting production costs with the associated revenues of potential users. As the cultivation of short rotating coppice in Germany is still in its experimental stage, the focus of this article is on the comparison of different production processes as well as on a critical evaluation of the available data base. The results show that – with no government aid taken into account – large scale cultivation can reach profitability only under very optimistic assumptions. Considering the necessary long term...
Tipo: Working or Discussion Paper
Palavras-chave: Short rotation Coppice; Farmer’s income; Renewable energy; Profitability; Rural areas; Community/Rural/Urban Development; Farm Management; Resource /Energy Economics and Policy; Q23; R32.
Ano: 2005
URL: http://purl.umn.edu/18785

Economic Analysis of Feed-in Tariffs for Generating Electricity from Renewable Energy Sources
Provedor de dados: 31
Autores: van Kooten,   G. Cornelis.
Tipo: Working or Discussion Paper
Palavras-chave: Feed-in tariffs; Renewable energy; Resource /Energy Economics and Policy.
Ano: 2011
URL: http://purl.umn.edu/107093

Economic Parameters for Corn Ethanol and Biodiesel Production
Provedor de dados: 31
Autores: Eidman,   Vernon R.
This article presents current investment and operating costs of ethanol and biodiesel plants for alternative prices of feedstock. The price of these two fuels is estimated for alternative prices of crude oil with the existing renewable fuels policy. The excise tax credit, currently $0.51 per gallon of ethanol and $1.00 per gallon of biodiesel, is a major contributor to the fuel price and profitability of these industries. The analysis demonstrates how the crude oil price, feedstock price, and excise tax credits interact to impact profitability of these industries
Tipo: Journal Article
Palavras-chave: Biodiesel; Biofuels; Ethanol; Renewable energy; Resource /Energy Economics and Policy; Q13; Q18; Q28; Q42.
Ano: 2007
URL: http://purl.umn.edu/6519

Az energetikai célú növénytermelés megítélése
Provedor de dados: 31
Autores: Szecsei,   Timea; Salamon,   Lajos.
A Nyugat-dunántúli Régió gazdálkodói körében vizsgáltuk az energetikai növények ismertségét, a termelés megítélését és az alacsony vállalkozói aktivitás okait. Avezetők csupán 7%-a hallott az összes megjelölt energianövényről, míg 11% még egyikkel sem találkozott. Azok a vezetők, akik bizonyos szintű ismerettel már rendelkeznek a vizsgált energianövényekről, nagyobb érdeklődést mutatnak az átlagnál. Az információk elérhetőségével a válaszadók 29%-a elégedetlen és 53%-a közepesen elégedett. Avárható támogatásoktól és a realizálható árbevételtől függ alapvetően az energianövények termelésére való vállalkozás, de fontos még a felvásárlási szerződés és a feldolgozóüzem távolsága is. Asaját üzemi felhasználás lehetősége csak közepes minősítést kapott. A...
Tipo: Journal Article
Palavras-chave: Megújuló energia; Biomassza; Energianövény-termelés; Nyugat-dunántúli Régió; Renewable energy; Biomass; Energy crop cultivation; Western Transdanubian Region; Crop Production/Industries; Land Economics/Use; Resource /Energy Economics and Policy.
Ano: 2010
URL: http://purl.umn.edu/99192

A BIOMASSA FLORESTAL (LENHA) COMO INSUMO ENERGÉTICO PARA OS ARTESÃOS DA CIDADE DE TRACUNHAÉM/PE
Provedor de dados: 31
Autores: Silva,   Ana Maria Navaes Da; Albuquerque,   Jose de Lima; Silva,   Elizandro Souza Da; Santos Filho,   Demorval Dos; Barbosa,   Waldinilson Barros.
Situado na Zona da Mata pernambucana, o município de Tracunhaém tem como principal atividade econômica a cerâmica artesanal. A arte ceramista do município conta com renomados artistas, o que faz da cidade um dos maiores centros de excelência na arte da modelagem do barro no país. Pernambuco abriga parte de dois biomas importantíssimos para a biodiversidade do planeta, a Mata Atlântica e a Caatinga, apresenta preocupante estado de degradação ambiental.Os impactos variam desde pequenos focos de desmatamentos, até áreas em processo de desertificação. Este trabalho analisa a demanda por biomassa florestal pelos artesãos de Tracunhaém, em Pernambuco. As atividades desenvolvidas pelos artesãos  apresentam um grande potencial impactante, pois além de utilizarem a...
Tipo: Conference Paper or Presentation
Palavras-chave: Biomassa florestal; Artesão; Consumo de lenha; Energia renovável; Forest biomass; Craftsman; Consumption of firewood; Renewable energy; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/109606

The Economics of Wind Power with Energy Storage
Provedor de dados: 31
Autores: Benitez,   Pablo C.; Dragulescu,   Lilianna; van Kooten,   G. Cornelis.
We develop a nonlinear mathematical optimization program for investigating the economic and environmental implications of wind penetration in electrical grids and evaluating how hydropower storage could be used to offset wind power intermittence. When wind power is added to an electrical grid consisting of thermal and hydropower plants, it increases system variability and results in a need for additional peak-load, gas-fired generators. Our empirical application using load data for Alberta’s electrical grid shows that 32% wind penetration (normalized to peak demand) results in a net cost increase of $C5.20/ MWh, while 64% wind penetration could result in an increase of $12.50/MWh. Costs of reducing CO2 emissions are estimated to be $41-$56 per t CO2 . When...
Tipo: Working or Discussion Paper
Palavras-chave: Renewable energy; Carbon costs; Hydropower storage; Mathematical programming; Environmental Economics and Policy; Resource /Energy Economics and Policy; Q40; Q42; Q50.
Ano: 2006
URL: http://purl.umn.edu/37029

Consumers’ knowledge of bio-energetics
Provedor de dados: 31
Autores: Tamus,   Antalne.
Our aim was to establish the specific objectives and toolkit of eco-energetic marketing targeting the North Hungarian region, through a primary survey of 600 persons. Our research objective was to examine – taking the region’s economic and social circumstances into consideration – what conditions, consumer reception, and affinity is needed to gain competitive advantage with the involvement of renewable energy sources, and also to point out the characteristics of how the population currently uses energy, its mode and satisfaction level. During the examination of consumers’ familiarity level with renewable energy sources we observed the dominance of solar, hydro, and wind energy, nevertheless, their knowledge about these renewable energy sources was rather...
Tipo: Journal Article
Palavras-chave: Renewable energy; Attitude; Associations; Primary research; Consumer/Household Economics; Food Consumption/Nutrition/Food Safety; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/48088

Socioeconomic Impacts of the Langdon Wind Energy Center
Provedor de dados: 31
Autores: Leistritz,   F. Larry; Coon,   Randal C.
The Langdon Wind Energy Center is the largest wind energy facility to be developed in North Dakota to date and consists of 106 turbines with a generating capacity of 1.5 MW each, mounted on towers 262 feet tall. The project is owned by FPL Energy and Ottertail Power Company; FPL Energy was the project developer. Construction of the facility began in July, 2007 and was completed in January, 2008. The peak construction work force was 269 workers. A force of 10 permanent employees will operate and maintain the energy center. Construction of the Langdon Wind Energy Center is estimated to have resulted in payments of more than $56 million to entities within North Dakota. During operation, the facility will make payments of about $1.4 million annually to North...
Tipo: Report
Palavras-chave: Wind energy; Renewable energy; Economic impact; Fiscal impact.
Ano: 2008
URL: http://purl.umn.edu/37285

Solar drying of cowpea bean combined with drying in a heat accumulator dryer
Provedor de dados: 91
Autores: Alves,Ronaldo A.; Queiroz,Alexandre J. de M.; Figueirêdo,Rossana M. F. de; Silva,Wilton P. da; Gomes,Josivanda P.
ABSTRACT As solar radiation is abundant in Brazil during most of the year and this source of energy is renewable and non-polluting par excellence, solar drying of agricultural products is a promising methodology. The objective of this study was to dry cowpea [Vigna unguiculata (L.) Walp.] bean grains using solar energy in different exposure times, adjusting the mathematical models and calculation of the effective diffusivity. Drying was performed during the day with samples exposed to the sun; during the night, half of the samples were put to dry in a heat accumulator dryer for nighttime drying and the other half was left on a laboratory bench as control. Cowpea bean grains had initial and final moisture contents of 65.42 and 6.73% d.b. (after drying in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vigna unguiculata; Renewable energy; Mathematical models.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000900709

Institutional arrangements in the commercialization of electric energy from sugarcane biomass in the Brazilian midwest
Provedor de dados: 123
Autores: Garcia,Marli da Silva; Vilpoux,Olivier François; Cereda,Marney Pascoli.
abstract: Reducing the use of fossil fuels and mitigating environmental impacts justifies the generation of electricity from renewable sources. In Brazil, sugarcane is the biomass that most generates electricity, and Mato Grosso do Sul state accounts for 10% of this electricity. Production can be traded in the spot market, long-term contracts regulated by the Federal Government, or free contracts between companies. Despite these options, only half of the sugarcane industries in Mato Grosso do Sul commercialize electricity. Based on Transaction cost economics, the objective of this work is to identify the most suitable governance structures used in the commercialization of electricity produced by the sugarcane plants in the state of Mato Grosso do Sul and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Renewable energy; Transaction cost economics; Institutions; Plural forms.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-20032021000300209

Greenhouse tomato production with electricity generation by roof-mounted flexible solar panels
Provedor de dados: 63
Autores: Ureña-Sánchez,Raúl; Callejón-Ferre,Ángel Jesús; Pérez-Alonso,José; Carreño-Ortega,Ángel.
The integration of renewable energy sources into greenhouse crop production in southeastern Spain could provide extra income for growers. Wind energy could be captured by small to medium-sized wind turbines, gas could be produced from biomass, and solar energy could be gathered by solar panels. The aim of this study was to examine the effect of flexible solar panels, mounted on top of a greenhouse for electricity production, on yield and fruit quality of tomatoes (Solanum lycopersycum L., cv Daniela). This study was undertaken in a commercial raspa y amagado greenhouse, typical of the Almería region (Spain). Tomato plantlets were planted at a density of 0.75 plants m-2. The flexible solar panels were mounted on two parts of the roof in different...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum lycopersycum L.; Shading; Total production; Renewable energy; Fruit quality.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000400001

การวิเคราะห์ความพอเพียงของกากน้ำตาลและมันสำปะหลัง เพื่อการผลิตเอทานอล และข้อเสนอแนะจากผลพยากรณ์ปริมาณการผลิต การใช้ และการส่งออกเอทานอลของประเทศไทย
Provedor de dados: 106
Autores: Sasiwimon Sriyotha; Weerapat Sessomboon.
Tipo: PhysicalObject
Palavras-chave: Tapioca; Molasses; Ethanol; Renewable energy; Plant energy production; Prediction; Consumption; Export; Demand; Supply; มันสำปะหลัง; กากน้ำตาล; พืชพลังงาน; การผลิตพลังงานทดแทน; เอทานอล; การพยากรณ์; ปริมาณการผลิต; การใช้พลังงาน; การส่งออก; อุปสงค์; อุปทาน.
Ano: 2012
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5820

Factors affecting properties of fuel pellets from compaction of mixed biomass and waste plastics
Provedor de dados: 111
Autores: Auprakul, Unchana; Promwungkwa, Anucha; Tippayawong, Nakorn; Chaiklangmuang, Suparin.
The purpose of this research is to investigate densified solid fuel from mixed plastic wastes which were recovered from dumpsites. Corn stover was used as natural binder of the fuel. In this study, the corn stover can bind plastic materials into the fuel using compaction. The densification of mixed plastic wastes and corn stover was investigated at 150 MPa compression pressure. The size of pellet was 8 mm in diameter and 20 mm in length. The parameters effect on the fuel properties of this research were moisture content (5-20%w.b.), types of material, mixed plastic wastes and corn stover ratio (55:45, 65:35 and 75:25), and preheating temperatures (75 and 100°C). Results found that corn stover can improve chemical properties (reducing sulfur and chlorine...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomass; Densification; RDF; Renewable energy; Waste-to-energy.
Ano: 2019
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/5181

Effects of temperature and time on oil extraction from some Nigerian indigenous fresh water microalgae species
Provedor de dados: 111
Autores: Asoiro, Felix Uzochukwu; Okonkwo, Wilfred Ifeanyi; Akubuo, Clement Onyeaghala; Nweze, Nkechinyere O.; Anyanwu, Cosmas Ngozichukwu.
This study determined the effects of temperature and time on oil extraction from indigenous freshwater microalgae– Dictyosphaerium, Chlorella, Desmodesmus and Cosmarium species, cultured in fifteen 2-litre column photobioreactors (PBR) (three per specie).  Growth and specific growth rates for the mixotrophic&gt;autotrophic cultivation of the species. Oil was extracted from the dried microalgae species at temperatures ranging from 40 to 120 °C at 20 oC intervals and times ranging from 30 to 210 minutes at 30 minutes’ intervals, by accelerated solvent extraction method. Extraction temperature, time and type of microalgae species had significant effect (p &lt; 0.05) on oil yield (temperature &gt; time &gt; type of species).  As extraction temperature and time...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agricultural engineering; Bioresources engineering; Biotechnology; Energy; Renewable energy; Agriculture. oil yield; Dictyosphaerium spp; Desmodesmus subspicatus; Chlorella lewinii; Cosmarium spp; Growth rate.
Ano: 2019
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/5247

Development and performance evaluation of indigenized flat plate collector water heater for domestic and industrial applications
Provedor de dados: 111
Autores: Ghafoor, Abdul.
Pakistan is facing severe energy crises from the last decade resulting daily electric blackouts from 8 to 12 h. The limited fossil fuel reserves and its environmental consequences have led to boost research and development of alternate energy resources. A huge amount of fossil fuels and electricity is being consumed for the generation of low to medium temperature heat energy for domestic, residential, agro-industrial and processing units. This low to medium temperature heat energy required can easily be fulfilled using solar collectors. This paper focus on the development of a flat plate collector using local infrastructure to reduce its initial cost. The collector consists of a window glass, absorber plate coated with black matt paint, copper tubes, inlet...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Renewable energy; Flat plate collector; Collector efficiency; Payback time.
Ano: 2015
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3352

Pressure build-up and wear analysis of tapered screw extruder biomass briquetting machines
Provedor de dados: 111
Autores: Orisaleye, Joseph Ifeolu; Ojolo, Sunday Joshua; Ajiboye, Joseph S.
The design of efficient screw extruder biomass briquetting machines is important for the utilization of loose biomass materials from wood and agricultural wastes for the production of solid fuel. In this study, the effects of geometrical parameters (channel depth and helix angle) and operational parameters (friction coefficient, mass flow rate and speed) on the performance and design of the briquetting machine were investigated using a pressure model based on the plug flow theory. An analytical model, which utilizes the pressure model, was also developed from Archard’s wear law to investigate screw wear of biomass briquetting machines. The study on the pressure model showed that a shallow screw channel and small helix angle resulted in rapid pressure...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mechanical Engineering; Agricultural Engineering; Bioenergy; Renewable energy; Machine design Screw extruder; Biomass briquetting machine; Plug flow theory; Archard’s wear law; Pressure build-up.
Ano: 2019
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4927

Energy trends and the water-energy binomium for Brazil
Provedor de dados: 42
Autores: Rocha,Gisele O. Da; Anjos,Jeancarlo P. Dos; Andrade,Jailson B. De.
According to the demands of energy saving and carbon emission reduction, the water vs. energy nexus has become a major concern worldwide. Brazil occupies a singular position in the global energy system. A major portion of the Brazilian occupancies has electricity and the energy system expansion that, at first, possesses adequate means for supporting the economic growing may experience some turnovers. The Brazil determination through alternative fuels was a natural choice, given its large hydropower potential and land agricultural base. In the transportation sector Brazil has developed its energy matrix towards an important rate of ethanol and biodiesel. Although those fuels are low carbon emitter, they may probably not be an affordable alternative...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Renewable energy; Fossil fuel; Water-energy nexus; Brazilian energy matrix.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200569

Public Policies to Be Implemented to Encourage the Use of Renewable Energy Sources in the Rural Area of Paraná
Provedor de dados: 52
Autores: Batista,Alexandre G.; Betini,Roberto C.; Bareta,Maria Luiza E.; Sandim,Álvaro A.; Pepplow,Luiz A.
Abstract Around the world there’s a rising interest in the installation of renewable energy sources due to their ecological, economical, political and social advantages. In this article is studied specifically the case of the incentive towards the installation of these sources in the state of Parana’s rural area, where they wouldn’t just be ecologically interesting, but also would help the improvement on the living conditions of the rural producers, promote income distribution and would cause an increase on the power supply, this way reducing the tariff. However, the problem arises in the acquisition of the energy generator, since even though they are interesting for the rural producers, these sources are majorly too expensive and end up being beyond their...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Renewable energy; Public policies; Rural areas.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132019000200219

Evaluation of Global Heating Reduction Potential with the Replacement of Electricity Supplied by the Local Concessionaire Via Solar Renewable Source.
Provedor de dados: 52
Autores: Pepplow,Luiz Amilton; Silva,Vander Luiz da; Betini,Roberto C.; Pereira,Thulio C. G.
Abstract The objective of this paper is to evaluate, through the 100-year Life Cycle Analysis, Global Warming Potential (GWP) and Global Temperature Increasing Potential (GTP) impact categories. It is proposed scenario of replacement of the energy matrix for the supply of electricity by Solar Photovoltaic, adopting as consumption base the facilities of Supermarkets, as they contribute to environmental impacts for greenhouse gas emissions such as: intensive use of electricity, occupation large areas such as the main building or parking lot sealing the ground, the movement of customers' vehicles with air and noise pollution and the use of plastic bags. Modifying the energy matrix using electricity from renewable sources enables the reduction of greenhouse...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Renewable energy; Life cycle assessment; Environmental impact.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132019000200202

Integration of Renewable Energy Sources to Operate in Microgrids in Rural Zones in Brazil
Provedor de dados: 52
Autores: Bareta,Maria Luiza E.; Sandim,Álvaro A.; Batista,Alexandre G.; Betini,Roberto C.; Pepplow,Luiz A.
Abstract In a world where technology is even more essential, quality and reliability of electrical system are fundamental. In Brazil, country where most of the energy is produced thought power plants, the existing distribution network is overwhelmed and the needs for the consolidation of distributed generation is growing. Wind and Solar power generation from biomass and another renewable sources are one alternative to power plants, which requires large areas and massive investment. The renewable energy sources mentioned may be assembled in a way to generate reliable energy to properties far from the cities, such as rural zones, where often energy from power plants doesn’t gets to. Distributed generation allows quick development of Brazilian farming and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microgrid; Renewable energy; Rural zones; Distributed generation; Energy potential.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132019000200218

Assessment of the Potential Implementation of Solar Energy Generation in State Schools in Curitiba/PR
Provedor de dados: 52
Autores: Pereira,Juliano da Silva; Ribeiro,Daniele Abe; Lucena,Francielle Henrique; Urbanetz Júnior,Jair.
ABSTRACT Solar energy as a form of electric power generation is gaining ground in Brazil, being the subject of worldwide discussions on sustainability. The electric energy, a right of all citizens, represents a consumption of natural resources on a large scale. State schools in Paraná invested more than R$ 46 million to guarantee electricity and thus provide essential running conditions to the system in 2016. Through open data, 15 schools from "Regional Administrativa do Cajuru", in Curitiba/PR, were evaluated in consumption and expenses of electric energy from January to May of 2017 and a solar photovoltaic system was dimensioned to supply the demand of each school. From that, it was estimated the total saving from the electricity that would no longer be...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Photovoltaic Solar Energy; Renewable energy; Education for Sustainability; State Schools; Public Administration.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132018000200208

Economic feasibility of biogas production in swine farms using time series analysis
Provedor de dados: 65
Autores: Rockenbach,Felipe Luis; Souza,Adriano Mendonça; Oliveira,João Helvio Righi de.
ABSTRACT: This study aimed to measure the economic feasibility and the time needed to return capital invested for the installation of a swine manure treatment system, these values originated the sale of carbon credits and/or of compensation of electric energy in swine farms, using the Box-Jenkins forecast models. It was found that the use of biogas is a viable option in a large scale with machines that operate daily for 10h or more, being the return period between 70 to 80 months. Time series analysis models are important to anticipate the series under study behavior, providing the swine breeder/investor means to reduce the financial investment risk as well as helping to decrease the production costs. Moreover, this process can be seen as another source of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodigestors; Biogas; Renewable energy; Income; Time series.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000701295

Deterioration and fermentability of energy cane juice
Provedor de dados: 65
Autores: Ceccato-Antonini,Sandra Regina; Bassi,Ana Paula Guarnieri; Paraluppi,Anna Livia; Santos,Eder Gustavo Dias dos; Matsuoka,Sizuo.
ABSTRACT: The main interest in the energy cane is the bioenergy production from the bagasse. The juice obtained after the cane milling may constitute a feedstock for the first-generation ethanol units; however, little attention has been dedicated to this issue. In order to verify the feasibility of the energy cane juice as substrate for ethanol production, the objectives of this research were first to determine the microbiological characteristics and deterioration along the time of the juices from two clones of energy cane (Type I) and second, their fermentability as feedstock for utilization in ethanol distilleries. There was a clear differentiation in the bacterial and yeast development of the sugarcane juices assayed, being much faster in the energy...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioenergy; Biomass; Renewable energy; Ethanol 1G.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000900751

Energy potential of residual maize biomass at different spacings and nitrogen doses
Provedor de dados: 64
Autores: Ambrosio,Rodrigo; Pauletti,Volnei; Barth,Gabriel; Povh,Fabrício Pinheiro; Silva,Dimas Agostinho da; Blum,Hilbert.
ABSTRACT Agricultural residual biomass is an important source of energy, and its production and quality vary according to the crop management. This study aimed to assess the effects of plant distribution and nitrogen fertilization on the energy production potential of the biomass of maize cultivated under no tillage. The field experiment was installed in southeast Brazil using five nitrogen rates (0, 60, 120, 180, and 240 kg ha-1) and two inter-row spacings (0.4 and 0.8 m). Grain yield, residual biomass productivity, and bioenergy potential in different parts of the plant (grain, stalk+leaf, husk, and cob) were assessed. No change in grain yield was observed using narrow row spacing. Stalk+leaf and husk productivity was higher using 0.8 m than using 0.4 m...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Renewable energy; Zea Mays (L.); Calorific value; Electricity; Macronutrients.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542017000600626

Production, carbon and nitrogen in stover fractions of corn ( Zea mays L.) in response to cultivar development
Provedor de dados: 64
Autores: Barbosa,Julierme Zimmer; Ferreira,Carla Fernanda; Santos,Nicolas Zendonadi dos; Motta,Antonio Carlos Vargas; Prior,Stephen; Gabardo,Juarez.
ABSTRACT Changes in quantity and quality of corn crop stover can have a large impact on soil conservation and soil carbon (C) sequestration over large areas. The aim of this study was to evaluate changes in production, concentration and amount of C and nitrogen (N) in corn stover fractions due to cultivar development. Two field experiments were conducted in the city of Rolândia (Paraná State, Brazil) using ten cultivars representing five technological levels: single cross hybrids, double or triple hybrids, commercial varieties, and creole cultivars. Plant heights and stalk, leaf, cob, husk and tassel weights were determined at final harvest. Elemental C and N analyses were performed in triplicate for each stover fraction. In general, the creole cultivars...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: C/N ratio; Genetic breeding; No-tillage system; Integrated crop-livestock systems; Renewable energy.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542016000600665

Quality and energetic evaluation of the charcoal made of babassu nut residues used in the steel industry
Provedor de dados: 64
Autores: Protásio,Thiago de Paula; Trugilho,Paulo Fernando; Mirmehdi,Seyedmohammad; Silva,Marcela Gomes da.
Brazil is the only country in the world that uses large scale charcoal in steel-making blast furnaces. Meantime, the monoculture plantations of Eucalyptus are not able to meet the demand for charcoal from the steel industries.Therefore, research is necessary, in order to use lignocellulosic residues for the production of charcoal with technological properties which are suitable for the reduction of iron ore. Given the above, the objective of this study was to evaluate the quality of charcoal which was made with babassu nut shell and designed for utilization in the steel industry in the function of the final carbonization temperature. All three layers of babassu nut shell (epicarp, mesocarp and endocarp) were used together. The initial temperature of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alternative biomass; Renewable energy; Bio-reducer; Carbonization.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542014000500003