Academic literature on the topic 'Planta solar concentrada'
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Journal articles on the topic "Planta solar concentrada":
1
Gonzalez, Cristina. "Modelado y simulación de tanques de almacenamiento térmico para ciclos de potencia Brayton supercríticos." INNOVATION & DEVELOPMENT IN ENGINEERING AND APPLIED SCIENCES 3, no. 1 (September 18, 2021): 16. http://dx.doi.org/10.53358/ideas.v3i1.555.
Abstract:
Hoy en día, la forma de aprovechar las energías renovables es un tema de interés para la comunidad científica, principalmente la energía solar por ser la más abundante, inagotable y disponible en todo el mundo. A fin de aprovechar esta energía en forma de calor los investigadores han diseñado diferentes tecnologías, siendo limitadas en su mayoría por la intermitencia que caracteriza a la energía solar. Como técnica para reducir el impacto por la intermitencia se plantea el diseño de un sistema de almacenamiento, diseño que consta de un tanque para almacenamiento térmico y un fluido de transferencia térmica. En el presente trabajo se presenta el diseño paramétrico del tanque de almacenamiento térmico para una planta de energía solar concentrada que trabaja con ciclos de potencia Brayton supercríticos, diseño que toma en cuenta las sugerencias y disposiciones mencionadas en la norma API-650.
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Bezerra, Pedro Henrique Silva. "PREVISÃO DE PERFORMANCE ENERGÉTICA POR MEIO DE SIMULAÇÃO TRANSIENTE DE UM SISTEMA CSP COM TORRE CENTRAL INTEGRADO A ATIVIDADES AGROINDUSTRIAIS." ENERGIA NA AGRICULTURA 33, no. 3 (December 13, 2018): 255–60. http://dx.doi.org/10.17224/energagric.2018v33n3p255-260.
Abstract:
Para demonstrar o funcionamento da tecnologia CSP, é de fundamental importância a simulação dos processos por meio de ferramentas computacionais, que permitem a previsão do desempenho energético. O objetivo dessa pesquisa foi obter o desempenho energético de uma usina CSP com receptor central, com capacidade instalada de 70kWel, integrado a sistemas agroindustriais em São Paulo. A pesquisa se baseou na criação de um modelo de sistema CSP, para geração de eletricidade, acoplados a um Matadouro e Laticínio. As análises foram realizadas com do uso da ferramenta computacional TRNSYS. Os resultados prévios oriundos das simulações foram em resposta à irradiação solar. Nas melhores épocas do ano em que a radiação é mais frequente e intensa, foi-se registrado valores acima de 1000 W/m², sendo que durante o ano, o valor integral obtido foi 1.957,73 kW/m²/ano. Os valores de eficiência óptica obtidos alcançaram a ordem de 45%. A eficiência média de conversão do calor proveniente do sol em eletricidade do ciclo foi 18%. Durante o dia, a potência líquida da turbina foi de aproximadamente 30 kWe, sendo que o valor de geração anual integrado foi na ordem de 108.618 kWh/ano. Ao aplicar os valores de geração obtidos no perfil do consumo do Laticínio, os resultados apontaram que em um dia de geração, considerável bom com 10 horas de irradiação, a planta supriria 60% da demanda energética. O sistema pode ser analisado como uma alternativa de eficiência energética com aplicação da resolução ANEEL 482/2012.Palavras-chave: Energia Solar Concentrada; sistema CSP com torre central; desempenho energético. ENERGY PERFORMANCE PREDICTION BY TRANSIENT SIMULATION OF A CSP SYSTEM WITH CENTRAL TOWER INTEGRATED TO AGRO-INDUSTRIAL ACTIVITIES ABSTRACT: To demonstrate the operation of CSP technology is fundamental to simulate the processes by computational tools, which allow prediction of energy performance. The objective of this research was obtain the energy performance of CSP plant with central receiver, with installed capacity of 70kWel, integrated an agribusiness systems in São Paulo. The research was based on the creation of a model of CSP system, for electricity generation, coupled to a Slaughterhouse and Dairy. The analyzes were performed with the use of the computational tool TRNSYS. The previous results from the simulations were in response to solar irradiation. In the best times of the year when radiation is more frequent and intense, values above 1000 W / m² were recorded, and during the year the total value obtained was 1.957.73 kW / m² / year. The average efficiency heat conversion from the sun into electricity cycle was 18%. During the day, the net power of the turbine was approximately 30 kWe, and the integrated annual generation value was in the order of 108,618 kWh / year. By applying the generation of values obtained in Dairy consumption profile, the results showed that a day generation, with considerable good 10 hours of irradiation, the plant would supply 60% of the energy demand. The system can be analyzed as an alternative energy solution with the application of ANEEL resolution 482/2012.KEYWORDS: Concentrated Solar Power; CSP system with central tower; performance.
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Bezerra, Pedro Henrique Silva, Odivaldo José Seraphim, and Celso Eduardo Lins De Oliveira. "PREVISÃO DE PERFORMANCE ENERGÉTICA POR MEIO DE SIMULAÇÃO TRANSIENTE DE UM SISTEMA CSP COM TORRE CENTRAL INTEGRADO A ATIVIDADES AGROINDUSTRIAIS." ENERGIA NA AGRICULTURA 33, no. 3 (December 13, 2018): 264–69. http://dx.doi.org/10.17224/energagric.2018v33n3p264-269.
Abstract:
Para demonstrar o funcionamento da tecnologia CSP, é de fundamental importância a simulação dos processos por meio de ferramentas computacionais, que permitem a previsão do desempenho energético. O objetivo dessa pesquisa foi obter o desempenho energético de uma usina CSP com receptor central, com capacidade instalada de 70kWel, integrado a sistemas agroindustriais em São Paulo. A pesquisa se baseou na criação de um modelo de sistema CSP, para geração de eletricidade, acoplados a um Matadouro e Laticínio. As análises foram realizadas com do uso da ferramenta computacional TRNSYS. Os resultados prévios oriundos das simulações foram em resposta à irradiação solar. Nas melhores épocas do ano em que a radiação é mais frequente e intensa, foi-se registrado valores acima de 1000 W/m², sendo que durante o ano, o valor integral obtido foi 1.957,73 kW/m²/ano. Os valores de eficiência óptica obtidos alcançaram a ordem de 45%. A eficiência média de conversão do calor proveniente do sol em eletricidade do ciclo foi 18%. Durante o dia, a potência líquida da turbina foi de aproximadamente 30 kWe, sendo que o valor de geração anual integrado foi na ordem de 108.618 kWh/ano. Ao aplicar os valores de geração obtidos no perfil do consumo do Laticínio, os resultados apontaram que em um dia de geração, considerável bom com 10 horas de irradiação, a planta supriria 60% da demanda energética. O sistema pode ser analisado como uma alternativa de eficiência energética com aplicação da resolução ANEEL 482/2012.
Palavras-chave: Energia Solar Concentrada; sistema CSP com torre central; desempenho energético.
ENERGY PERFORMANCE PREDICTION BY TRANSIENT SIMULATION OF A CSP SYSTEM WITH CENTRAL TOWER INTEGRATED TO AGRO-INDUSTRIAL ACTIVITIES
ABSTRACT: To demonstrate the operation of CSP technology is fundamental to simulate the processes by computational tools, which allow prediction of energy performance. The objective of this research was obtain the energy performance of CSP plant with central receiver, with installed capacity of 70kWel, integrated an agribusiness systems in São Paulo. The research was based on the creation of a model of CSP system, for electricity generation, coupled to a Slaughterhouse and Dairy. The analyzes were performed with the use of the computational tool TRNSYS. The previous results from the simulations were in response to solar irradiation. In the best times of the year when radiation is more frequent and intense, values above 1000 W / m² were recorded, and during the year the total value obtained was 1.957.73 kW / m² / year. The average efficiency heat conversion from the sun into electricity cycle was 18%. During the day, the net power of the turbine was approximately 30 kWe, and the integrated annual generation value was in the order of 108,618 kWh / year. By applying the generation of values obtained in Dairy consumption profile, the results showed that a day generation, with considerable good 10 hours of irradiation, the plant would supply 60% of the energy demand. The system can be analyzed as an alternative energy solution with the application of ANEEL resolution 482/2012.
KEYWORDS: Concentrated Solar Power; CSP system with central tower; performance.
4
Brito, Fabiano Baldez da Costa, Marcos Antonio Cruz Moreira, Augusto Eduardo Miranda Pinto, Severino Joaquim Correia Neto, and Eurico Huziwara. "Energia termosolar: uma revisão de literatura." Boletim do Observatório Ambiental Alberto Ribeiro Lamego 16, no. 1 (December 30, 2022): 138–60. http://dx.doi.org/10.19180/2177-4560.v16n12022p138-160.
Abstract:
O sol é a principal fonte de energia do nosso planeta e sua utilização contribui para o equilíbrio da matriz energética. A energia do calor solar concentrado é um campo de pesquisa em expansão, carecendo de melhorias em todos os sistemas das plantas termosolares para aumento da eficiência. O presente trabalho apresenta uma breve introdução ao assunto e uma revisão bibliográfica de trabalhos publicados entre 2015 e o primeiro trimestre de 2019, mostrando as principais tendências de pesquisa neste tema, classificadas em: estudos de viabilidade e modelagem matemática. análise de falhas; armazenamento de energia térmica; revestimentos para coletores solares; riscos ambientais; e, outros usos relevantes. O desenvolvimento de plantas CSP, seja de grande capacidade instalada ou para geração distribuída, além de diversificar as fontes de energia aumentando a confiabilidade do sistema de geração nacional, pode fomentar a geração de emprego e renda no sertão brasileiro, área de grande vulnerabilidade social.
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Silva, João Pedro Vicente da, Roseane Alves Chagas, and Gabriel Biancolin Moimás. "DESENVOLVIMENTO DE UMA PLANTA TERMOSSOLAR DE CONCENTRADOR CILINDRO-PARABÓLICO COM SISTEMA DE REAPROVEITAMENTO DE FLUIDO." Revista Estudos & Pesquisas Unilins 1, no. 1 (June 16, 2021): 12–19. http://dx.doi.org/10.54149/pesquisaunilins.2020.v1.38.
Abstract:
O Brasil, como um país de clima tropical, é privilegiado por taxas altas de incidência solar e, embora a tecnologia de geração de energia elétrica fotovoltaica venha se expandindo, pouco se discorre acerca de uma outra matriz energética: a energia solar térmica. Devido a isso, este trabalho se propôs a dimensionar, projetar e, por fim, construir um concentrador solar de tecnologia cilíndrica-parabólica com materiais acessíveis, para, dessa maneira, averiguar a geração de vapor pelo protótipo. Para tal, cálculos para estimar o tempo de geração de vapor foram realizados após a montagem do concentrador, levando em consideração as dimensões da planta e propriedades físicas dos materiais que a compõem. Um ensaio preliminar foi realizado e constatou-se tanto elevação suficiente da temperatura da água, como o início de sua vaporização. Com isso, é possível concluir que este trabalho apresentou, preliminarmente, resultados que convergem com sua expectativa, os quais serão solidificados pela continuação desta pesquisa no PIC 2020/2021.
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Tafur Escanta, Paul Michael, Luis Coco, and Javier Muñoz. "Viabilidad de Mezclas Supercríticas en Ciclos Brayton Acoplados a Plantas de Energía Solar Concentrada." INNOVATION & DEVELOPMENT IN ENGINEERING AND APPLIED SCIENCES 2, no. 2 (May 21, 2021): 16. http://dx.doi.org/10.53358/ideas.v2i2.527.
Abstract:
En este trabajo se promueve estudiar la viabilidad del uso de mezclas basadas en CO2 supercrítico que pueda conducir a rendimientos térmicos en los ciclos Brayton más altos que los obtenidos con el fluido estándar (s-CO2 puro). Las configuraciones que se recomienda analizar son las de Recompresión y Recompresión con enfriamiento intermedio en el compresor principal que pueden incluir más de un recalentamiento. Estas configuraciones son muy transcendentales debido a que en términos de eficiencia son las que mayores valores presentan y, además, sus costos totales por capacidad neta instalada son los más bajos en comparación con otras configuraciones.
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Wang, Yizhu, Yang Wang, Heping Li, Junhu Zhou, and Kefa Cen. "Thermal properties and friction behaviors of slag as energy storage material in concentrate solar power plants." Solar Energy Materials and Solar Cells 182 (August 2018): 21–29. http://dx.doi.org/10.1016/j.solmat.2018.03.020.
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Freitas, Saulo R., Karla M. Longo, M. A. F. Silva Dias, and P. L. Silva Dias. "Emissões de queimadas em ecossistemas da América do Sul." Estudos Avançados 19, no. 53 (April 2005): 167–85. http://dx.doi.org/10.1590/s0103-40142005000100011.
Abstract:
AS QUEIMADAS que ocorrem majoritariamente em áreas tropicais do planeta, são fontes importantes de poluentes para a atmosfera. Na América do Sul, durante os meses de inverno, uma área, principalmente de ecossistemas de cerrado e floresta, da ordem de 40 mil km² é queimada anualmente. Estas queimadas ocorrem primariamente nas regiões Amazônica e do Brasil Central, porém, através do transporte atmosférico de suas emissões resulta uma distribuição espacial de fumaça sobre uma extensa área, ao redor de 4-5 milhões de km², em muito superior a área onde estão concentradas as queimadas. Durante a combustão de biomassa são emitidos para a atmosfera gases poluentes e partículas de aerossol que interagem eficientemente com a radiação solar e afetam os processos de microfísica e dinâmica de formação de nuvens e a qualidade do ar. Os efeitos destas emissões excedem, portanto, a escala local e afetam regionalmente a composição e propriedades físicas e químicas da atmosfera na América do Sul e áreas oceânicas vizinhas, com potencial impacto em escala global.
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Johnson, David W., James M. Krall, Ronald H. Delaney, and Larry O. Pochop. "Response of Monocot and Dicot Weed Species to Fresnel Lens Concentrated Solar Radiation." Weed Science 37, no. 6 (November 1989): 797–801. http://dx.doi.org/10.1017/s0043174500072866.
Abstract:
Fresnel lenses are used to concentrate solar radiation to a line or point. A linear Fresnel lens (0.91 by 1.52 m, 0.74-m focal length, 0.01- by 1.52-m line focus) was investigated as a method for weed control. Field experiments were conducted to assess the effect of Fresnel lens concentrated solar radiation at various exposure times, stages of plant growth, and soil surface moisture conditions. On a dry soil surface exposure times of 1 to 10 s at 290 C resulted in control of redroot pigweed from 100% for a 1-s exposure at the cotyledon stage to 89% for a 10-s exposure at the 10-leaf stage. Redroot pigweed and kochia control was similar at exposures of 3 to 10 s, but less for kochia at 1 and 2 s. Green foxtail control was less than that of kochia and redroot pigweed. Control was reduced on a moist compared to a dry soil surface. Concentrated solar radiation holds the greatest potential for control of small dicot weeds on a dry soil surface.
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Zhou, Hao, Zhaowen Wang, Mingxi Zhou, and Jianuo Xu. "Thermal properties, permeability and compressive strength of highly porous accumulated ceramsites in the foundation of salt tank for concentrate solar power plants." Applied Thermal Engineering 164 (January 2020): 114451. http://dx.doi.org/10.1016/j.applthermaleng.2019.114451.
Dissertations / Theses on the topic "Planta solar concentrada":
1
Neves, Joana Brilhante das. "Desenvolvimento de um concentrador solar fixo para foto-estimulação." Master's thesis, FCT-UNL, 2011. http://hdl.handle.net/10362/7119.
Abstract:
Dissertação para obtenção do grau de Mestre
em Engenharia BiomédicaCom este trabalho pretendeu-se desenvolver um protótipo que emitisse luz vermelha, de 660 nm de c.d.o., de forma a poder testá-la num alvo biológico e assim confirmar a sua eficácia no desenvolvimento de tecidos vivos. Ao longo do tempo de duração deste trabalho foram simulados, no programa de design óptico Zemax®, vários protótipos de emissores de luz vermelha, tais como: LEDs vermelhos, lentes de Fresnel com aberração cromática e concentradores de luz solar, posteriormente filtrada, de formas diversas. Com todos estes estudos, concluiu-se que a solução mais viável, em vários aspectos, seria a construção de um concentrador cónico com um filtro que deixasse passar apenas a luz desejada na extremidade. Descoberto o esquema ideal para o projecto, deu-se início à construção do concentrador cónico através de um processo de moldagem, pela maquinação de um molde interior, por torneamento de um cilindro de PVC, e um molde exterior de cimento. Com o concentrador construído, estudou-se a eficiência de transmissão do mesmo bem como a de três filtros ópticos, cada um transmitindo apenas uma gama de c.d.o. centrados em 650 nm, 660 nm e 850 nm, respectivamente. Por último, procedeu-se à aplicação da luz projectada em plantas a fim de se estudar o seu desenvolvimento como resposta às três radiações de c.d.o. diferentes. Os resultados obtidos mostram que a luz solar concentrada e filtrada pode ser usada para acelerar o crescimento de plantas, em particular quando filtrada com o filtro que transmite principalmente o c.d.o. de 660 nm.
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Torero, Cáceres Raúl Martín. "Engorde de ovinos bajo pastoreo de mezcla rye grass y trebol sola o con suplementación de concentrado." Bachelor's thesis, Universidad Nacional Mayor de San Marcos, 2002. https://hdl.handle.net/20.500.12672/1572.
Abstract:
En las instalaciones de La Estación Experimental IVITA el Mantaro se evaluó el efecto de suplementar con ensilado, afrechillo de trigo y una mezcla de afrechillo más harina de pescado a ovinos que pastoreaban una pastura cultivada, sobre la ganancia diaria cuatro meses de edad y 20.2 Kg. de pesó vivo o en promedio, durante un periodo de 56 días.At IVITA’s El Mantaro Reserarch Station n the central Andean Mantaro Valley was evaluated the effect of enhancing whit silage, wheat’s bran, and mixture of bran and fish meal to sheep that were grazed cultivated pasture.
Tesis
Book chapters on the topic "Planta solar concentrada":
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Gómez Muñoz, Carlos Quiterio, Fausto Pedro García Marquez, Cheng Liang, Kogia Maria, Mohimi Abbas, and Papaelias Mayorkinos. "A New Condition Monitoring Approach for Maintenance Management in Concentrate Solar Plants." In Advances in Intelligent Systems and Computing, 999–1008. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-47241-5_84.
2
Meier, Paul F. "Solar." In The Changing Energy Mix, 228–73. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190098391.003.0008.
Abstract:
There are two basic approaches for using solar energy to generate electricity. The first type, solar photovoltaic (PV) energy, uses semiconductors to convert sunlight into electricity. Crystalline silicon semiconductors are the most common type in use. The second approach is called concentrating solar power (CSP), also referred to as solar thermal. Basically, CSP uses mirrors to concentrate sunlight and generate steam, which is used to power a turbine. The most common method employed commercially is the parabolic trough, where the mirrors are horizontally disposed in a parabolic shape. Solar PV is more commonly used commercially because of high capital costs for building a CSP power plant. Solar PV has experienced rapid growth over the last ten years, increasing by more than twentyfold in the United States. Growth for CSP has increased threefold over the same ten years, but no growth over the last four years. Spain and the United States lead the world in commercial CSP plants.
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Dar, Arnon. "Influence of supernovae, gamma-ray bursts, solar flares, and cosmic rays on the terrestrial environment." In Global Catastrophic Risks. Oxford University Press, 2008. http://dx.doi.org/10.1093/oso/9780198570509.003.0017.
Abstract:
Changes in the solar neighbourhood due to the motion of the sun in the Galaxy, solar evolution, and Galactic stellar evolution influence the terrestrial environment and expose life on the Earth to cosmic hazards. Such cosmic hazards include impact of near-Earth objects (NEOs), global climatic changes due to variations in solar activity and exposure of the Earth to very large fluxes of radiations and cosmic rays from Galactic supernova (SN) explosions and gamma-ray bursts (GRBs). Such cosmic hazards are of low probability, but their influence on the terrestrial environment and their catastrophic consequences, as evident from geological records, justify their detailed study, and the development of rational strategies, which may minimize their threat to life and to the survival of the human race on this planet. In this chapter I shall concentrate on threats to life from increased levels of radiation and cosmic ray (CR) flux that reach the atmosphere as a result of (1) changes in solar luminosity, (2) changes in the solar environment owing to the motion of the sun around the Galactic centre and in particular, owing to its passage through the spiral arms of the Galaxy, (3) the oscillatory displacement of the solar system perpendicular to the Galactic plane, (4) solar activity, (5) Galactic SN explosions, (6) GRBs, and (7) cosmic ray bursts (CRBs). The credibility of various cosmic threats will be tested by examining whether such events could have caused some of the major mass extinctions that took place on planet Earth and were documented relatively well in the geological records of the past 500 million years (Myr). A credible claim of a global threat to life from a change in global irradiation must first demonstrate that the anticipated change is larger than the periodical changes in irradiation caused by the motions of the Earth, to which terrestrial life has adjusted itself. Most of the energy of the sun is radiated in the visible range. The atmosphere is highly transparent to this visible light but is very opaque to almost all other bands of the electromagnetic spectrum except radio waves, whose production by the sun is rather small.
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Harris Angel D, Er, Er Revathi V, Er Rosalin Muskil G, and Dr Senbagavalli M. "APPLICATION OF DATA SCIENCE IN RENEWABLE ENERGY SYSTEMS." In Futuristic Trends in Computing Technologies and Data Sciences Volume 3 Book 6, 8–11. Iterative International Publishers, Selfypage Developers Pvt Ltd, 2024. http://dx.doi.org/10.58532/v3bict6p1ch2.
Abstract:
The increasing Power demand has made the need for optimal use of Renewable Energy systems in Power sector. Non renewable energy sources are depleting every day and cause many impacts in the environment. So in order to meet the global need of clean energy it is important to concentrate on renewable energy sources like solar and wind power. Here we emphasize the application of Data science in renewable power production to improve efficiency and reliability. Changing weather makes the solar power inefficient and non-reliable. The process starts from collecting weather data from weather forecasting sources. A sensor unit to sense temperature, humidity and rain is also set in phase to feed the weather data. Analyzing the weather forecast values and IoT sensor values with the preset reference values through the ML algorithm the Data Modeling will be done. So integrating the IoT sensors and weather forecast data with Solar Panel movement and rotation control will make the Power production more efficient. It makes the Power Generation Capacity of the Solar plant Predictable and makes the operation easy during Peak Demands. Maintenance and installation of new Photovoltaic panels can be done based on the data models and analytics. Thus the overall efficiency of the power system will be improved by optimal result evaluation and testing. The same process can be applied to the wind mills. The direction, speed and velocity values of wind can be fed to the data collection unit using IoT and further analysis and evaluation can be done by ML algorithms and open source soft ware’s like Python, Anconda and Jupyter notebook.
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Shine, Philip, Michael D. Murphy, and John Upton. "Tools and technologies to reduce fossil energy use on dairy farms." In Energy-smart farming: Efficiency, renewable energy and sustainability, 265–88. Burleigh Dodds Science Publishing, 2022. http://dx.doi.org/10.19103/as.2022.0100.16.
Abstract:
With a growing demand for milk and dairy products coupled with concerns regarding greenhouse gas emissions, the sustainable use of on-farm energy resources is essential. Milk production requires electrical energy for powering plant equipment, liquid fuels for powering machinery, indirect energy for fertilizer and feed production, and embodied energy within machinery and buildings. Conventional dairy farms require 54% more primary energy inputs than organic farms due to greater use of fertiliser and concentrate feed. Pasture-based feeding systems showed 55% less feed energy demand. The installation of milk pre-cooling and variable speed drive drives can be effective measures to mitigate on-farm electricity use in the milking shed, while solar PV systems have the potential to cost effectively reduce energy related greenhouse gas emissions. Energy demand and cost savings vary from farm-to-farm, so tools such as the Dairy Energy Decision Support Tool are essential for informing stakeholders about effective smart energy strategies that can reduce energy demand.
Conference papers on the topic "Planta solar concentrada":
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"ESTUDO DE ALTERNATIVAS TECNOLÓGICAS VISANDO NACIONALIZAÇÃO E METODOLOGIA PARA ALOCAÇÃO DE PLANTAS TERMOSSOLARES CONCENTRADAS NO BRASIL." In Anais Congresso Brasileiro de Energia Solar 2018. Associação Brasileira de Energia Solar, 2018. http://dx.doi.org/10.59627/cbens.2018.419.
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"ANÁLISE TERMOECONÔMICA DE UMA PLANTA HÍBRIDA DE GERAÇÃO DE ENERGIA COM CICLO RANKINE E CONCENTRADOR SOLAR PARABÓLICO." In Anais Congresso Brasileiro de Energia Solar 2022. Associação Brasileira de Energia Solar, 2022. http://dx.doi.org/10.59627/cbens.2022.1218.
3
Zaversky, F., S. Bergmann, and W. Sanz. "Detailed Modeling of Parabolic Trough Collectors for the Part Load Simulation of Solar Thermal Power Plants." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-68032.
Abstract:
Solar thermal power plants are a promising way of providing clean renewable electric energy. These plants concentrate the incoming solar direct irradiation in order to heat up a heat transfer fluid. The collected thermal energy can be stored or instantly delivered to a power block where part of the thermal energy is converted to electrical energy in a turbine with the connected generator. The parabolic trough collector plant is the today’s most developed solar thermal power plant type. There the solar irradiation is focused on receiver tubes which are concentrically placed to the focal lines of the parabolic trough collectors. A high temperature oil is pumped through these receiver tubes, which collects the heat and delivers it later on to the steam generator of the connected Rankine steam cycle. In order to improve the efficiency of these solar thermal power plants, the direct steam generation (DSG) within the parabolic trough collector receiver tubes is being investigated. Both types of parabolic trough collectors, the conventional type using oil as heat transfer fluid and the direct steam generation type, are subject of this paper. A detailed steady-state parabolic trough collector model was developed for each type, using the thermodynamic simulation software IPSEpro. The developed models consider the cosine-loss attenuation factor, the shading attenuation factor, optical losses, as well as thermal losses. Appropriate heat transfer and pressure loss correlations were implemented for both collector types. For the direct steam generation model, distinct collectors for the preheating section, the evaporation section and the superheating section were used. Furthermore, the suitable length of discretization for the modeling of one collector loop within a center-fed solar field was investigated. Calculated solar field performance data for the oil concept were compared to validated data available in open literature. Finally, a power plant simulation with each collector type, over the course of one reference day, showed the great potential of the direct steam generation, as well as the suitability of IPSEpro for running solar thermal power plant yield simulations.
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Sacht, Helenice Maria. "Plantas em interiores." In XVII ENCONTRO NACIONAL DE CONFORTO NO AMBIENTE CONSTRUÍDO. ANTAC, 2023. http://dx.doi.org/10.46421/encac.v17i1.3816.
Abstract:
As plantas ornamentais fornecem recursos ambientais essenciais, benefícios econômicos, sociais e estéticos para o bem-estar do ser humano, influenciando inclusive na saúde mental. Cultivadas cada vez mais para decoração de ambientes internos e externos, e em alguns casos até para o consumo, ganharam ainda mais destaque nos últimos anos, por meio do estilo denominado Urban Jungle (Selva Urbana), que consiste em incluir plantas e elementos rústicos ligados à natureza, concentrados nos ambientes. A pesquisa em questão teve como objetivo o monitoramento de temperatura do ar e umidade relativa do ar do Andar 43 (urban jungle), em comparação à uma unidade convencional (apartamento de referência), ambas localizadas no edifício Mirante do Vale em São Paulo, no mesmo andar e orientação solar; de forma a avaliar a influência da vegetação no microclima interior. Para tal, foram levantadas informações das unidades monitoradas e realizadas medições com Data Logger Hobo UX100-023 e por fim, realizada uma análise comparativa. Nos resultados do presente estudo observou-se uma diminuição máxima de 3,25 °C e média de 0,5°C, na temperatura do ar interior, e ainda, um aumento na umidade relativa máximo de 23,28% e médio de 5,78%, que é desejável para o clima de São Paulo. Isso confirma que a vegetação no interior, pode resultar na diminuição do consumo energético para climatização, para o caso de edifícios com necessidade de resfriamento, principalmente durante o verão.
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Price, Henry, Mark Mehos, Chuck Kutscher, and Nate Blair. "Current and Future Economics of Parabolic Trough Technology." In ASME 2007 Energy Sustainability Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/es2007-36171.
Abstract:
Solar energy is the largest energy resource on the planet. Unfortunately, it is largely untapped at present, in part because sunlight is a very diffuse energy source. Concentrating solar power (CSP) systems use low cost reflectors to concentrate the sun’s energy to allow it to be used more effectively. Concentrating solar power systems are also well suited for large solar power plants that can be connected into the existing utility infrastructure. These two facts mean that CSP systems can be used to make a meaningful difference in energy supply in a relatively short period. CSP plants are best suited for the arid climates in the Southwestern United States, Northern Mexico, and many desert regions around the globe. A recent Western Governors’ Association siting study [1] found that the solar potential in the U.S. Southwest is at least 4 times the total U.S. electric demand even after eliminating urban areas, environmentally sensitive areas, and all regions with a ground slope greater than 1%.While it is currently not practical to power the whole county from the desert southwest, only a small portion of this area is needed to make a substantial contribution to future U.S. electric needs. Many of the best sites are near existing high-voltage transmission lines and close to major power load centers in the Southwest (Los Angeles, Las Vegas, and Phoenix). In addition, the power provided by CSP technologies has strong coincidence with peak electric demand, especially in the Southwest where peak demand corresponds in large part to air conditioning loads. Parabolic troughs currently represent the most cost-effective CSP technology for developing large utility-scale solar electric power systems. These systems are also one of the most mature solar technologies, with commercial utility-scale plants that have been operating for over 20 years. In addition, substantial improvements have been made to the technology in recent years including improved efficiency and the addition of thermal energy storage. The main issue for parabolic trough technology is that the cost of electricity is still higher than the cost of electricity from conventional natural gas-fired power plants. Although higher natural gas prices are helping to substantially reduce the difference between the cost of electricity from solar and natural gas plants, in the near-term increased incentives such as the 30% Investment Tax Credit (ITC) are needed to make CSP technology approach competitiveness with natural gas power on a financial basis. In the longer term, additional reductions in the cost of the technology will be necessary. This paper looks at the near-term potential for parabolic trough technology to compete with conventional fossil power resources in the firm, intermediate load power market and at the longer term potential to compete in the baseload power market. The paper will consider the potential impact of a reduced carbon emissions future.
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Silva Leal, Rayssa, Paulo Davi A. de Freitas Araujo, Patrick Diego A. da Silva, Diógenes M. R. de Sousa, Samuel Pereira da Rocha, Jose Vieira Neto, Lucas Vinicius Hartmann, Camila Seibel Gehrke, and Fabiano Salvadori. "Análise da Inserção de Sistemas de Armazenamento de Energia por Bateria na Rede Elétrica - Estudo de Caso." In Congresso Brasileiro de Automática - 2020. sbabra, 2020. http://dx.doi.org/10.48011/asba.v2i1.977.
Abstract:
Atualmente o estudo da aplicabilidade de recursos energeticos distribudos (distributed energy resources - DER) apresenta-se como fundamental no que se refere ao suprimento, conabilidade e qualidade da energia eletrica. Isso se deve, dentre outros fatores, ao aumento signicativo da geração distribuda (GD), em especial a partir de energia eólica, solar e biomassa, as quais apresentam maior variabilidade do que o previsto no modelo classico de controle do sistema eletrico. Uma possvel solução e o uso de sistemas de armazenamento de energia (ESS -energy storage system), os quais podem proporcionar estabilidade da rede, alem de, possibilitar a conservação de recursos energéticos fosseis e reduzir o impacto ambiental de geração de energia. Nesse sentido, este trabalho e resultado de um projeto de P&D/ANEEL, cujos objetivos foram, desenvolver uma solução, atraves de um produto nacional combinando hardware e software e construir plantas hbridas utilizando usinas fotovoltaicas e geração com biomassa combinadas com armazenamento de energia utilizando baterias. Para avaliação e validação das melhorias na rede uma planta experimental com ESS a baterias e GD fotovoltaica foi construda, permitindo injeção ou consumo controlados de potência ativa e reativa na rede eletrica. Uma breve revisão sobre sistemas de armazenamento, mas especicamente baterias, e concentrando o estudo nas baterias de chumbo acido e ons de ltio, tecnologias estas utilizadas na planta em estudo. Foram adquiridos dados da planta real e corroborados com simulações realizadas na plataforma MATLAB/SIMULINKTM a partir dos quais foram realizadas analises do comportamento da inserção de DER, na rede eletrica.
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Carnelli, Lino, Carla Lazzari, Tamara Passera, Chiara Sartori, and Joseph Epoupa Mengou. "Integration of Concentrating Solar Heat into Oil and Gas Operations for Increased Sustainability." In Abu Dhabi International Petroleum Exhibition & Conference. SPE, 2021. http://dx.doi.org/10.2118/208176-ms.
Abstract:
Abstract According to Eni's mission to reach carbon neutrality in the countries where it operates, the development of renewable energy could be a key element in the company's strategy for evolving the business model towards a low carbon scenario. In this context, concentrating solar technology can provide a real solution in order to goal the carbon neutrality. Solar thermal energy could be an alternative source to the fossil fuel in industrial processes and also in the oil&gas sector, where the upstream operations (dewatering, stabilization, sweetening…) require substantial amounts of heat. Usually this heat is easily produced by combustion of natural gas available at the oil&gas site. Concentrating Solar Heat (CSH) technology allows to produce process heat by using specific collectors that concentrate the solar radiation onto a receiver where a heat transfer fluid is heated at medium/high temperature. A thermal energy storage can be added to the solar field to increase the solar fraction and reducing so the CO2 emissions. The fraction of thermal energy not covered by the CSH plant can be provided by a fossil source that acts as a back-up. With this in mind, a pre-feasibility study was carried out for the integration of a medium temperature(∼200-300°C) concentrating solar plant with or without a thermal storage system and a back-up gas heater in an oil&gas site located in North Africa. The solar heat partially replaces the duty necessary to the heat exchangers that heat the crude to guarantee the separation from water and best stabilization. Reflective areas of the solar field and total occupancy, thermal energy production during the year, solar multiple and preliminary evaluations of cost of investment are presented. Obviously, the reduction of CO2 emission increases with the solar fraction but the competitiveness and cost-effectiveness of the integration strongly depend on the local cost of natural gas, the presence of government incentives, CO2 credit tax, etc. In any case the proposed solution represents an important step towards energy transition.
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Stark, Jeremy, Julius Yellowhair, John N. Hudelson, Mark Horenstein, and Malay Mazumder. "Optical Modeling of Reflectivity Loss Caused by Dust Deposition on CSP Mirrors and Restoration of Energy Yield by Electrodynamic Dust Removal." In ASME 2014 8th International Conference on Energy Sustainability collocated with the ASME 2014 12th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/es2014-6506.
Abstract:
For large scale CSP power plants, vast areas of land are needed in deserts and semi-arid climates where uninterrupted solar irradiance is most abundant. These power facilities use large arrays of mirrors to reflect and concentrate sunlight onto collectors, however, dust deposition on the optical surfaces causes obscuration of sunlight, resulting in large energy-yield losses in solar plants. This problem is compounded by the lack of natural clean water resources for conventional cleaning of solar mirrors, often with reflective surface areas of large installations exceeding a million square meters. To investigate the application of transparent electrodynamic screens (EDS) for efficient and cost effective dust removal from solar mirrors, both optical modeling and experimental verifications were performed. Prototype EDS-integrated mirrors were constructed by depositing a set of parallel transparent electrodes into the sun-facing surface of solar mirrors and coating electrodes with thin transparent dielectric film. Activation of the electrodes with a three-phase voltage creates an electrodynamic field that charges and repels dust electrostatically by Coulomb force and sweeps away particles by a traveling electrodynamic wave. We report here brief discussions on (1) rate of deposition and the properties of dust with respect to their size distribution and chemical composition in semi-arid areas of the southwest US and Mojave Desert and their adhesion to solar mirrors, (2) optical models of: (a) specular reflection losses caused by scattering and absorption by dust particles deposited on the surface based on Mie scattering theory, and (b) reflection loss by the integration of EDS on the mirror surface, computed by FRED ray-tracing model. The objective is to maintain specular reflectivity of 90% or higher by frequent removal of dust by EDS. Our studies show that the incorporation of transparent EDS would cause an initial loss of 3% but would be able to maintain specular reflectivity more than 90% to meet the industrial requirement for CSP plants. Specular reflection measurements taken inside a climate controlled environmental chamber show that EDS integration can restore specular reflectivity and would be able to prevent major degradation of the optical surface caused by the deposition of dust.
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Riazi, H., and N. A. Ahmed. "Efficiency Enhancement of a Small Scale Closed Solar Thermal Brayton Cycle by a Combined Simple Organic Rankine Cycle." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-88503.
Abstract:
In this paper efficiency enhancement of a small scale closed solar thermal Brayton cycle is investigated by combining it to a simple organic Rankine cycle. Brayton power cycles are generally known as the enabling technology for high temperature solar power towers due to their higher efficiencies compared to other power cycles. Unlike conventional solar-thermal plants, which concentrate the sun’s energy to generate steam for driving a turbine, the Brayton thermodynamic does not use water. Instead, the concentrated solar energy is used to heat compressed air, which then expands through a gas turbine to generate power. Irreversible loss in compressor and turbine, the operating temperature of solar collector and recuperator effectiveness are the main features that limit the net power output of the system which should be considered and analyzed. The exhaust of the gas turbine is still at high temperature that should be cooled down before entering the compressor. Thus, this heat can be utilized to operate a low temperature Rankine cycle and increase the system efficiency and power generation. Operating points of off the shelf micro-turbines and steam turbine with parabolic solar dish concentrator of various concentrating ratios are considered. Thermodynamic analysis is applied, by using the first and second law of thermodynamics, to obtain the optimum temperature of solar collector, minimum irreversibility rates to maximize the efficiency and net power output of the system at various steady-state conditions. Results show that for the closed solar thermal Brayton cycle the maximum overall first law efficiency of the system can be increased of more than 5% by combining a simple Rankine cycle to recover the exhaust heat and a significant 20% increase in the second law efficicency. The system efficiency is related to the solar concentration ratio with an optimum operating temperature and the choice of micro-turbine. On this basis, both the overall efficiency and the total output power may reach their maximum value by optimizing the pressure ratio. In a small scale closed solar thermal Brayton cycle combined by a Rankine cycle with a micro turbine operating at its highest compressor efficiency, the operating conditions can be optimized in such a way that the system produces maximum net power output or having the highest overall efficiency.
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Chang, Hsueh-Chia. "Electrokinetics of Nanochannels: The Next Nanotechnology for Ion/Molecule/Nanocolloid Sensing, Concentration and Filtration." In ASME 2009 7th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2009. http://dx.doi.org/10.1115/icnmm2009-82128.
Abstract:
Because nanochannels act as lenses that can focus electric fields on a chip, they can concentrate and filter ions, molecules and nanocolloids by ion selectivity, electrodeless dielectrophoresis and surface hybridization. However, before fabricated nanochannels can lead to the next-generation of chip-scale dialysis membranes, preconcentrators for mass spectrometers, ion sieves, molecular sensors, solar/fuel cell membranes etc, the anomalous dc I-V characteristics and ac impedance of such nanochannels must be understood. Curious phenomena such as limiting and over-limiting currents, rectification, hysteretic cyclic voltametry, Warburg impedance, channel cross-talk etc will be studied with fabricated nanochannels, confocal microscopy and fluorescence correlation spectroscopy and analyzed mathematically with fundamental Nernst-Planck ion transport theories, Guoy-Chapman equilibrium electrolyte theories and new non-equilibrium extended polarization theories.