865 resultados para Redução de consumo energético


Relevância:

100.00% 100.00%

Publicador:

Resumo:

O avanço nas áreas de comunicação sem fio e microeletrônica permite o desenvolvimento de equipamentos micro sensores com capacidade de monitorar grandes regiões. Formadas por milhares de nós sensores, trabalhando de forma colaborativa, as Redes de Sensores sem Fio apresentam severas restrições de energia, devido à capacidade limitada das baterias dos nós que compõem a rede. O consumo de energia pode ser minimizado, permitindo que apenas alguns nós especiais, chamados de Cluster Head, sejam responsáveis por receber os dados dos nós que formam seu cluster e propagar estes dados para um ponto de coleta denominado Estação Base. A escolha do Cluster Head ideal influencia no aumento do período de estabilidade da rede, maximizando seu tempo de vida útil. A proposta, apresentada nesta dissertação, utiliza Lógica Fuzzy e algoritmo k-means com base em informações centralizadas na Estação Base para eleição do Cluster Head ideal em Redes de Sensores sem Fio heterogêneas. Os critérios usados para seleção do Cluster Head são baseados na centralidade do nó, nível de energia e proximidade para a Estação Base. Esta dissertação apresenta as desvantagens de utilização de informações locais para eleição do líder do cluster e a importância do tratamento discriminatório sobre as discrepâncias energéticas dos nós que formam a rede. Esta proposta é comparada com os algoritmos Low Energy Adaptative Clustering Hierarchy (LEACH) e Distributed energy-efficient clustering algorithm for heterogeneous Wireless sensor networks (DEEC). Esta comparação é feita, utilizando o final do período de estabilidade, como também, o tempo de vida útil da rede.

Relevância:

100.00% 100.00%

Publicador:

Resumo:

This paper is proposed the usage of an Organic Rankine Cycle (ORC) along with waste heat recovery from an inconstant heat source. This method of waste heat recovery with intermittent heat source is part of a technical viability study. This paper also brings up the usage of thermal energy storage as heat source for the ORC. This paper is based on a heat treatment company study in which a natural gas furnace is explored. Data such as mass flow, temperature and specific waste gas heat from this furnace are used through calculations. Calculations are made also based on furnace cycles. This viability study considers a series of working fluids such as ammonia, benzene, R113 and R134a. Results point out that ORC with out thermal storage and using refrigerant fluid ammonia is the best alternative

Relevância:

100.00% 100.00%

Publicador:

Resumo:

Actually the energy efficiency is making more space in the industry, due to the search for the sustainability, the electrical energy costs reduction, the goals achievement or the efficiency of production processes. In consumer goods industries, such a beverage industry, as the work is based, the productivity is directly related to the electrical energy consumption. The development of methodologies and/or routines, in addition to some tools which allow to align more efficiently these two aspects (production and consumption of electrical energy), in the viewpoint of the Energy Conservation, is very important. In this case, the study will show the Plant Modulation concepts, a production management methodology, based in some factors related to the productive process, installed equipment, production supplies and energy cost. The proposed methodology was implanted in a plant along 2015 and show the results, in face to confirm its efficiency. Finally, in this study, it was shown the capacity of Plant Modulation to positively impact in the energy efficiency inside a big industry

Relevância:

100.00% 100.00%

Publicador:

Resumo:

Actually the energy efficiency is making more space in the industry, due to the search for the sustainability, the electrical energy costs reduction, the goals achievement or the efficiency of production processes. In consumer goods industries, such a beverage industry, as the work is based, the productivity is directly related to the electrical energy consumption. The development of methodologies and/or routines, in addition to some tools which allow to align more efficiently these two aspects (production and consumption of electrical energy), in the viewpoint of the Energy Conservation, is very important. In this case, the study will show the Plant Modulation concepts, a production management methodology, based in some factors related to the productive process, installed equipment, production supplies and energy cost. The proposed methodology was implanted in a plant along 2015 and show the results, in face to confirm its efficiency. Finally, in this study, it was shown the capacity of Plant Modulation to positively impact in the energy efficiency inside a big industry

Relevância:

100.00% 100.00%

Publicador:

Resumo:

El cumplimiento de los objetivos agrotécnicos de los cultivos de raíces y tubérculos exige que la labor de surcado configure un caballón que permita el trabajo de los posteriores aperos que participan en las demás labores de cultivo. En la agricultura cubana se emplean diversos tipos de surcadores que difieren en las características de los elementos aporcadores. Este hecho afecta a la capacidad de trabajo del conjunto tractor-apero y por extensión en el consumo de combustible y el rendimiento del cultivo. El objetivo de este trabajo ha sido fundamentar el empleo del apero más adecuado para la labor de surcado en cultivos de raíces y tubérculos (patata, boniato, yuca) en Fluvisoles, teniendo en cuenta el comportamiento de las dimensiones y forma del caballón, cualidades tecnológicas explotativas del conjunto tractor-apero, consumo energético del proceso productivo y el rendimiento agrícola. Los tratamientos considerados estuvieron determinados por la utilización del surcador fertilizador IIMA-BALDAN 4.500 (T1), y los surcadores aporcadores SA-5 (T2) y SA-3 (T3). En los tres tratamientos se alcanzó un perfil de la sección transversal del caballón de configuración cóncavo-convexo. El surcador BALDAN logró el mejor comportamiento de los indicadores tecnológico-explotativos lo que se tradujo en la mayor capacidad de trabajo de 1,36 ha h-1 y el menor consumo de combustible de 5,38 L ha-1. Este mismo tratamiento proporcionó el mayor rendimiento medio de los cultivos superando en un 43,2% al del surcador SA-5 y en un 57,9% al del surcador SA-3. Desde el punto de vista energético T1, obtuvo una mejor eficiencia energética superior en un 43,5% a la del tratamiento T2, y en un 57,1% a la del tratamiento T3. ABSTRACT The achievement of agrotechnical objectives in the cultivation of roots and tubers demands the plow through activity creates a ridge to allow the work of subsequent farming tools participating in other cultivation works. In Cuban Agriculture various kinds of furrowers are used which differ in the characteristics of their earth up elements. This fact affects work capacity of the tractor-farming tool combination and by extension to fuel consumption and cultivation yield. The aim of this work has been to support the use of the most accurate farming tool in the plow through activity for the cultivation of roots and tubers (potato, sweet potato, cassava) in Fluvisoils, taking into account the behaviour of the ridge´s dimensions and shape, technologic-explotative qualities of the tractor-farming tool combination, energy consumption of the productive process and agricultural yield. The treatments considered were determined by the use of fertlizing furrower IIMA-BALDAN 4.500 (T1), and the earth up furrowers SA-5 (T2) and SA-3 (T3). During the three treatments a transverse section profile of the ridge under concave-convex configuration was obtained. The furrower BALDAN achieved the best behaviour of the technologic-explotative indicators, which was translated into the largest work capacity of 1,36 ha h-1 and the smallest fuel consumption of 5,38 L ha-1. This treatment also provided the biggest average yield of the cultivation, overcoming in a 43,2% the furrower SA-5 and furrower SA-3 in a 57,9%. From the energetic point of view T1 gained better energetic efficiency than treatment T2 in a 43,5% and treatment T3 in a 57,1%.

Relevância:

100.00% 100.00%

Publicador:

Resumo:

Hoy en día, una política global eficiente dedicada a mejorar el sistema de transporte de una nación de la UE, no puede considerarse al margen de las recomendaciones de la Comisión Europea y de las iniciativas realizadas en los países del entorno. Los sistemas de transporte deben poder satisfacer las necesidades de movilidad de los ciudadanos y mercancías, que cada vez están involucrados en un mayor número de viajes y con una longitud media de recorrido mayor. El sector del transporte contribuye en gran medida al funcionamiento y competitividad de la economía europea en su conjunto: el campo del transporte terrestre genera el 11% de ese PIB. En lo que respecta a la eficiencia energética y a las emisiones, los costes externos del transporte en España alcanzan el 10% del PIB, mientras que en Europa asciende al 8% del PIB de los países de la Unión Europea (UE). Esta discrepancia se atribuye fundamentalmente a que en España la carretera representa un mayor peso en el sector del transporte, siendo responsable del 83% del total de los costes externos del transporte. El empleo de las tecnologías ITS puede contribuir a la mejora de esta situación mitigando el efecto de las externalidades negativas que produce el transporte: consumo energético, congestión, contaminación, accidentes, etc. El objetivo del presente estudio es analizar la influencia de las nuevas tecnologías ITS en el consumo energético de las áreas de peaje. Para ello se tiene en cuenta el flujo de tráfico y la tipología de vehículo. Por ejemplo, un cambio en la gestión de los sistemas de cobro de peajes hacia modelos de peaje free flow pueden suponer ahorros de hasta un 71% en el consumo energético.

Relevância:

100.00% 100.00%

Publicador:

Resumo:

Ante el problema creciente del consumo en los centros de datos, unido a la adopción paulatina de las mejores prácticas actuales para mejorar la eficiencia energética, se hace imprescindible un cambio radical en el enfoque de la energía en dichos centros de datos para poder seguir reduciendo de manera significativa su impacto medioambiental. En este artículo presentamos una propuesta inicial para la optimización integral del consumo de energía en centros de datos, que ha sido validado en un escenario de monitorización poblacional de salud, con ahorros de hasta un 50% frente al estado del arte en eficiencia energética. Defendemos una conciencia global del Estado y el comportamiento térmico del centro de datos, utilizando modelos predictivos para anticipar las variables determinantes para la optimización. Además, las estrategias de optimización energética de los centros de datos del futuro tienen que ser sociales: los distintos elementos (servidores, software de gestión, sistemas de refrigeración) deben tener cierta conciencia del estado de los demás elementos del sistema y de cómo el entorno los puede perjudicar o favorecer, buscando el consenso en estrategias colaborativas para reducir el consumo total.

Relevância:

100.00% 100.00%

Publicador:

Relevância:

100.00% 100.00%

Publicador:

Resumo:

In recent years, as part of the expansion process of its activities, the Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Norte – IFRN (Federal Institute for Education, Science and Technology of the State of Rio Grande do Norte – IFRN) detected the need to hire more employees for the institution. This expansion process, a policy of the Federal Government, together with the increase of human resources, required the construction of an adequate facility in the municipality of São Gonçalo do Amarante-RN, for training and qualification and as a means of better enabling its personnel. Along with this policy, the Federal Government is also deeply concerned that its buildings be environmentally friendly. This study deals with this subject matter, as it develops an architectural design of a public building with an emphasis upon the reduction of energy consumption, through the study of energy performance factors such as defined by Carneiro (1988) and adapted by the author of the present study. It is known that residential, commercial and public buildings represent about 45 % of energy consumption in Brazil. That is why it is necessary to consider the reduction of such consumption in buildings, as well as the role that professionals, especially architects, play in this issue. The most effective participation in this regard in the field of architecture occurs in the design phase. However, the architectural solution proposed here goes beyond the energy performance factors, since it also involves other aspects, such as the definition of the concept, the parti and the spatial solution itself. In this sense, the architectural project of the Centro de Treinamento dos Servidores do IFRN - CTSIFRN (Training Center for IFRN Personnel – CTSFIRN) is particularly fitting as a subject for research at the Professional Master Program at PPGAU/UFRN, which is devoted to research on architecture, design and the environment.

Relevância:

100.00% 100.00%

Publicador:

Resumo:

O presente trabalho realizou-se no âmbito do Projeto Galp 20-2020 implementado na empresa Sanindusa, em parceira com a Universidade de Aveiro. Como principal objetivo pretendia-se estudar o consumo de energia durante o processo de cozedura das peças cerâmicas com o intuito de avaliar a viabilidade da substituição do refratário existente na empresa. Uma vez que esta medida implicaria um tempo de retorno do investimento demasiado elevado, optou-se por estudar o consumo de energia associado a uma placa horizontal, de massa unitária, de qualquer tipo de material refratário. Para tal, foi desenvolvido um Modelo Teórico capaz de calcular o calor absorvido por uma placa de refratário ao longo de todo o percurso dentro do Forno Túnel 2, existente na empresa e utilizado no processo de produção das peças cerâmicas. Através deste estudo foi possível concluir que o Modelo Teórico é bastante útil na medida em que permite a criação de vários cenários, através da alteração de diversas variáveis, permitindo conhecer qual o impacto de cada uma no consumo de energia neste equipamento. Como trabalho futuro propõe-se o desenvolvimento do Modelo Teórico apresentado para o estudo da transferência de calor bidimensional. Esta melhoria permitiria analisar o consumo de energia associado a diferentes formas de material refratário utilizado no processo de cozedura de peças cerâmicas (o que não é possível quando se aplica o conceito de transferência de calor unidimensional).

Relevância:

100.00% 100.00%

Publicador:

Resumo:

Tesis (Ingeniero Eléctrico). -- Universidad de La Salle. Faculltad de Ingeniería. Programa de Ingeniería Eléctrica

Relevância:

100.00% 100.00%

Publicador:

Resumo:

This master thesis aims to assess the influence of the design decisions on the energy building performance of hotels. The research is based on the integration of field study and computer simulation. Firstly, a detailed field study is carried out to identify the characteristics of hotels in Natal, Rio Grande do Norte. The items assessed are occupancies, light and equipment densities, types of air conditioning, total and monthly energy consumption, among others. A second and more comprehensive field study is carried out to identify the range of occurrence of architectural variables, with a larger number of buildings. A base case is modelled in VisualDOE, based on the first field study. Then, a first set of simulations are run to explore the sensitivity of the variables on the energy consumption. The results analyses were the base of a second set of simulations, which combined the most influential variables. The results of 384 models were assessed, and the impacts of design decisions were quantified. The study discusses tendencies and recommendations, as well as the methods advantages and disadvantages

Relevância:

100.00% 100.00%

Publicador:

Resumo:

Las arquitecturas asimétricas, formadas por varios procesadores con el mismo repertorio de instrucciones pero distintas características de rendimiento y consumo, ofrecen muchas posibilidades de optimización del rendimiento y/o el consumo en la ejecución de aplicaciones paralelas. La planificación de tareas sobre dichas arquitecturas de forma que se aprovechen de manera eficiente los distintos recursos, es muy compleja y se suele abordar utilizando modelos de programación paralelos, que permiten al programador especificar el paralelismo de las tareas, y entornos de ejecución que explotan dinámicamente dicho paralelismo. En este trabajo hemos modificado uno de los planificadores de tareas más utilizados en la actualidad para intentar aprovechar todos los recursos al máximo, cuando el rendimiento así lo necesite, o para conseguir la mejor eficiencia energética posible, cuando el consumo sea más prioritario. También se ha utilizado una biblioteca desarrollada específicamente para la arquitectura asimétrica objeto de estudio en la Universidad de Texas, Austin. Para obtener el máximo rendimiento se han agrupado los núcleos del sistema en dos niveles: hay un cluster simétrico de núcleos virtuales idénticos, cada uno de los cuales está compuesto por un conjunto de núcleos asimétricos. El planificador de tareas asigna trabajo a los núcleos virtuales, de manera idéntica a como lo haría en un sistema multinúcleo simétrico, y la biblioteca se encarga de repartir el trabajo entre los núcleos asimétricos. El trabajo ha consistido en integrar dicha biblioteca con el planificador de tareas. Para mejorar la eficiencia energética se han incluido en el planificador de tareas políticas de explotación de los modos de bajo consumo de la arquitectura y también de apagado o no asignación de carga de trabajo a algunos de los núcleos, que se activan en tiempo de ejecución cuando se detecta que la aplicación no necesita todos los recursos disponibles en la arquitectura.

Relevância:

100.00% 100.00%

Publicador:

Resumo:

This master thesis aims to assess the influence of the design decisions on the energy building performance of hotels. The research is based on the integration of field study and computer simulation. Firstly, a detailed field study is carried out to identify the characteristics of hotels in Natal, Rio Grande do Norte. The items assessed are occupancies, light and equipment densities, types of air conditioning, total and monthly energy consumption, among others. A second and more comprehensive field study is carried out to identify the range of occurrence of architectural variables, with a larger number of buildings. A base case is modelled in VisualDOE, based on the first field study. Then, a first set of simulations are run to explore the sensitivity of the variables on the energy consumption. The results analyses were the base of a second set of simulations, which combined the most influential variables. The results of 384 models were assessed, and the impacts of design decisions were quantified. The study discusses tendencies and recommendations, as well as the methods advantages and disadvantages