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| Registros recuperados: 17 | |
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| Tainter, Joseph A; USDA Forest Service, Rocky Mountain Research Station; jtainter@fs.fed.us; Allen, T. F. H.; University of Wisconsin-Madison; tfallen@facstaff.wisc.edu; Little, Amanda; University of Wisconsin-Madison; amlittle@students.wisc.edu; Hoekstra, Thomas W; USDA Forest Service, Inventory and Monitoring Institute; thoekstra@fs.fed.us. |
| Energy gain constrains resource use, social organization, and landscape organization in human and other living systems. Changes in energy gain have common characteristics across living systems. We describe these commonalities in selected case studies involving imperial taxation, fungus-farming ants, and North American beaver, and propose a suite of hypotheses for the organization of systems that subsist on different levels of energy gain. Organizational constraints arising from energy gain predict changes to settlement and organization in postcarbon societies. |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Roman Empire; Beaver; Complexity; Energy; Energy gain; Fungus-farming ants; Leaf-cutting ants; Living systems; Organization; Renewable resources; Resources; Solar energy. |
| Ano: 2003 |
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| Altoé,Leandra; Oliveira Filho,Delly; Carlo,Joyce C.; Monteiro,Paulo Marcos de B.. |
| The simulation programs are important tools to analyze the different energetic alternatives, including the use of renewable energy. The objective of this study was to analyze comparatively the different computer tools available for modeling of solar water heaters. Among the main simulation software of solar thermal systems, there are: RETScreen International, EnergyPlus, TRNSYS, SolDesigner, SolarPro, e T*SOL. Among the tools mentioned, only EnergyPlus and RETScreen International are free, but they allow obtaining interesting results when applied together. The first one has a detailed module of energy analysis of solar water heaters, while the second one provides an detailed economic feasibility study and an assessment of emissions of greenhouse gases.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Simulation; Solar energy; Water heating. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000500018 |
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| Baschiera,Luciene M.; Fagnani,Maria A.. |
| ABSTRACT This study concerns a research conducted in 2014, in isolated communities of Cambriú and Foles belonging to the Cardoso Island State Park-SP, in order to establish a link between electrification through isolated photovoltaic systems type SIGIFI 30 (30 kWh/month) with the existing demands, interactions and changes in traditional communities studied. The energy in this case is presented as a structure component to these demands regarding to the labor, agriculture, fishing, health, education, comfort of buildings and income generation. The objective was to conduct an analysis of the implementation of photovoltaic electrification process, and to establish a relationship with the surveyed communities. The results demonstrated that electrification... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Solar energy; Energy demand; Implantation process. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000400536 |
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| Leva,Flávia F. de; Camacho,José R.; Oliveira Filho,Delly. |
| This study was conducted to evaluate and compare the behavior of the heating inside poultry shed through gas hood and underfloor heating. The experiment was conducted in poultry shed belonging to the Federal Institute of Education, Science and Technology of Triângulo Mineiro Region, Uberlândia city  state of Minas Gerais (MG), Brazil. The dimensions of the shed are 24 meters long and 9.6 meters wide and with a ceiling height of 3.2 meters. The temperature was measured with an optical thermometer of Minipa brand, MT 350 model. It was used, to the analysis of temperature behavior, the public domain software FEMM 4.2, which uses finite elements techniques, with data collected from two lots. Underfloor heating is made using hot water flowing through a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Energy consumption; Underfloor heating; Environment; Thermal comfort; Solar energy. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000400023 |
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| Souza,Adilson P. de; Escobedo,João F.; Dal Pai,Alexandre; Gomes,Eduardo N.. |
| It was evaluated the annual evolution of global, direct and diffuse components of incident solar radiation on tilted surfaces to 12.85, 22.85 and 32.85º, facing north, in Botucatu, state of São Paulo, Brazil. The radiometric fractions were obtained for each component of the radiation in the aforementioned surfaces, through the ratio with the global and top of the atmosphere radiations. Seasonality was evaluated based on monthly averages of daily values. The measures occurred between 04/1998 and 07/2001 at 22.85º; 08/2001 and 02/2003 at 12.85º; and from 03/2003 to 12/2007 at 32.85º, with concomitant measures in the horizontal surface (reference). The levels of global and direct radiation on tilted surfaces were lower in summer and higher in the equinoxes... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Solar energy; Clearness index; Atmospheric transmissivity; Climatic conditions. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000200005 |
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| Koksal,Nezihe; Incesu,Meral; Teke,Ahmet. |
| ABSTRACT: Pansy (Viola cornuta) is a facultative long-day plant that flowers from October until March in Turkey. During the winter months, low light levels can limit plant growth and development. Light emitting diodes (LEDs) can provide supplemental lighting in greenhouses which produce same light intensity with less energy than conventional incandescent lighting. Light emitting diode technologies have enabled affordable and efficient light systems to be installed in greenhouses and plastic tunnels in the field. In this experiment we evaluated the effects of supplemental red-orange LED lightening on the growth and development of pansy cv. Blue Blotch grown in plastic tunnels. The energy, which LEDs are to consume, was provided through a solar panel system... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Viola cornuta; Solar energy; Ornamental plants. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362015000400428 |
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| SILVA, F. M. e; SANTOS, W. R. dos; SCHULTZ, E. L.; CARVALHO, F. B. de P.; ANDREANI, L.; VALADARES, L. F.. |
| Entre as formas de aproveitamento da energia térmica solar, a energia heliotérmica concentra os raios solares e transforma a energia radiante em energia térmica, que, por sua vez, pode ser transformada em outras formas de energia úteis para a humanidade. Entretanto, esse tipo de energia é gerada apenas em dias ensolarados. Os concentradores solares são ferramentas utilizadas para coletar os raios solares, projetando‐os em um ponto focal, onde é colocado o recipiente com o material que será aquecido. De modo geral, os concentradores solares podem ser construídos com espelhos ou lentes, sendo os espelhos normalmente utilizados. Os concentradores feitos com espelhos planos podem ser fabricados com materiais de uso cotidiano e de baixo custo.Este... |
| Tipo: Comunicado Técnico (INFOTECA-E) |
Palavras-chave: Concentrador solar; Energia Solar; Aquecimento; Água; Equipamento; Custo de Produção; Coletor Solar; Solar energy; Solar collectors. |
| Ano: 2021 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1132557 |
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| Macías-Ganchozo,Edgar Ruperto; Bello-Moreira,Italo Pedro; Trueba-Macías,Sabrina Liz; Anchundia-Muentes,Xavier Enrique; Anchundia-Muentes,Manuel Eduardo; Bravo-Moreira,Celio Danilo. |
| Abstract The aim of the present research was to know the shelf life of dehydrated tropical fruits based on an indirect type solar dryer, which was designed and developed under the conditions of Calceta, Bolívar canton of Manabí province, Ecuador. Due to the banana fruit physical and chemical characteristics exhibited during the process of dehydration by radiation, satisfactory results were obtained, superior to those obtained in fruits of mamey and pineapple. For example, moisture in banana with 80.22% dropped to 10.35%; in relation to protein ratio, which had achieved an increasing from 1.27% in its fresh state to 2.18% and in fiber contents from 0.88% in its fresh state to 2.41%. The microbiological analyzes determined the shelf life of the estimated... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Absorption; Convective multi-flash drying process (CMDF); Fruit dehydration; Fruit postharvest; Solar energy; Water activity. |
| Ano: 2018 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122018000100030 |
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| Urbanetz Junior,Jair; Tonin,Fabianna Stumpf; Mariano,Juliana D’Angela; Tiepolo,Gerson Máximo. |
| ABSTRACT The Federal University of Technology - Paraná (UTFPR), Campus Curitiba, has a Grid-Connected Photovoltaic System (GCPVS) of 2.1 kWp in the Green Office (GO), which has been in operation since December 2011, and until September 2017 generated little more than 13.64 MWh and a GCPVS of 10.2 kWp, in operation since February 2016. The photovoltaic panel of the 2.1 kWp system was set up following the inclination of the roof of the building, which does not give its maximum performance. On the other hand, the panel of the 10.2 kWp system in Neoville was installed in optimum conditions, that is, oriented to the north and with slope equal to the latitude of Curitiba and, up tol September 2017 generated more than 20.65 MWh. This paper presents the monitoring... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Solar energy; Distribuited generation; Grid-connected photovoltaic system. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132018000200237 |
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| Gontijo,Jéssica Cristine; Wagner,Luiz Gustavo; Souza,Mariana Espíndola de; Possetti,Gustavo Rafael Collere. |
| ABSTRACT Sewage sludge is a solid waste composed of water, rich in organic matter and nutrients, but concentrator of pathogenic microorganisms. Its use as agricultural fertilizer in the state of Paraná, Brazil is common. However, it is necessary to eliminate or significantly reduce microorganisms by means of a hygiene process. This can be obtained thermally, requiring a source of energy for heat generation. In this sense, a pilot system was constructed consisting of a stainless steel radiant floor, capable of transferring heat to the sewage sludge from coils coupled in base, through which the heated water circulates. The energy comes from solar radiation and is complemented by biogas from the anaerobic sewage treatment. Aiming to investigate the system's... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biogas; Sanitation; Sewage sludge; Solar energy; Thermal drying. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132018000200217 |
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| Tiem,Wesley Thiago Egea; Unsihuay-Vila,Clodomiro. |
| Abstract The electrical sector is under constant evolution. One of the areas refers to the consumers that come to be generators, implementing distributed generation, interconnected to a smart grid. This article discusses the improvement of an algorithm, already presented in the literature, to make the best temporal allocation of loads, electric vehicle, storage and many sources of generation, aiming at the maximum financial performance, that is, the lowest value for the energy invoice The modeling consists of a Mixed Integer Linear Programming (MILP) algorithm, which considers each component of the system and weighs the maintenance and shelf life of storage devices, basically batteries, loads that can be reallocated and the concept of Vehicle-to-grid,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Microgrid; Microgeneration; Distributed generation; Wind energy; Solar energy; Load reallocation; Storage; Electric vehicle; Smart grid. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132018000200215 |
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| Lara Filho,Mauro Obladen de; Unsihuay-Vila,Clodomiro; Silva,Vilson Roiz Gonçalves Rebelo da. |
| Abstract The demand for electricity is growing worldwide. At the same time, the non-renewable natural resources that account for a large proportion of the global energy matrix are rapidly depleting, which will pose a major challenge in the near future. Therefore, micro-grid models that use renewable energy sources, such as solar and wind, are rapidly developing and are becoming economically viable alternatives. The objective of this study was to evaluate the economic viability of installing solar and wind power generation systems in the NOVVALIGHT electrical components factory located in Campo Largo, Paraná, Brazil. The most viable model was the combination of solar and wind energy, which would generate approximately 260 MWh of energy per year. Using... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Distributed generation; Solar energy; Wind energy. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132019000200204 |
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| Registros recuperados: 17 | |
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