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| Registros recuperados: 59 | |
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| 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 |
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| 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>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 < 0.05) on oil yield (temperature > time > 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| Registros recuperados: 59 | |
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