Thesis (Ph. D.)--University of Missouri-Columbia, 1997. / Typescript. Vita. Includes bibliographical references (leaves 96-98). Also available on the Internet.

Thesis (Ph. D.)--University of Missouri-Columbia, 1997. / Typescript. Vita. Includes bibliographical references (leaves 96-98). Also available on the Internet.

<p>This diploma work on D-level is made in cooperation with Varnäsföretagen AB in Eskilstuna. The company performs contract manufactured aluminium goods. This work is a continuation on earlier diploma work in Varnäsföretagen AB. Even if the industry process consumes much energy for melting the aluminium goods, they consume a great amount of oil to warm up the building. The purpose of this work is to examine some places in the building and the process to see how much energy it is possible to recycles to the heating system and reduce the costs for heating. The places have all a big heat excess and recycling will get more acceptable thermal comfort for the staff. </p><p>Studies of efficiency, the variation in power and temperatures is made to see how much energy it is possible to recycle. Many systems could with small measures be more efficient.</p><p>A general problem for many places is that the energy is in the indoor air and has low temperature. It means that most of the energy is difficult to use in other places than for preheating of the intake air in the air handling units.</p>

This diploma work on D-level is made in cooperation with Varnäsföretagen AB in Eskilstuna. The company performs contract manufactured aluminium goods. This work is a continuation on earlier diploma work in Varnäsföretagen AB. Even if the industry process consumes much energy for melting the aluminium goods, they consume a great amount of oil to warm up the building. The purpose of this work is to examine some places in the building and the process to see how much energy it is possible to recycles to the heating system and reduce the costs for heating. The places have all a big heat excess and recycling will get more acceptable thermal comfort for the staff.  Studies of efficiency, the variation in power and temperatures is made to see how much energy it is possible to recycle. Many systems could with small measures be more efficient. A general problem for many places is that the energy is in the indoor air and has low temperature. It means that most of the energy is difficult to use in other places than for preheating of the intake air in the air handling units.

Orientadores: Fujio Sato, Ernesto Ruppert Filho / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação / Made available in DSpace on 2018-08-14T19:28:59Z (GMT). No. of bitstreams: 1 Oliveira_CaioGomesde_M.pdf: 16585052 bytes, checksum: 61d70f191de8c032a8ab39cdcf8c652c (MD5) Previous issue date: 2009 / Resumo: Este trabalho trata de dois temas de grande relevância, principalmente nos últimos anos, na área de energia elétrica: a conservação e a qualidade da energia elétrica. Os estudos são baseados em dados de grandezas elétricas coletados por equipamentos de monitoração e gerenciamento de energia instalados em pontos distintos do Campus da Universidade Estadual de Campinas. A conservação de energia elétrica relaciona-se ao seu uso mais eficiente e sem desperdícios, importante por proporcionar um aumento da energia disponível, sem que sejam necessários grandes investimentos em geração, transmissão e distribuição, reduzindo, assim, impactos ambientais. A avaliação deste quesito surge de um projeto piloto, o Projeto Ecogera, cuja finalidade é avaliar a eficiência energética, por meio de um programa de uso racional e da exploração de fontes alternativas de energia elétrica. Aqui é discutido, então, o módulo de conservação de energia, desenvolvido em unidades de consumo com características típicas em relação ao tipo de atividade exercida na universidade, focando na redução de consumo em iluminação. Uma boa qualidade de energia elétrica remete à ausência de variações anormais na tensão, relacionada à continuidade do fornecimento e à forma de onda senoidal da alimentação. Os problemas na qualidade de energia têm se agravado ao longo dos anos, principalmente devido ao aumento das cargas não lineares, à maior sensibilidade dos equipamentos e à grande interconexão da rede elétrica, e podem resultar em má operação ou prejuízo a dispositivos. É dado um maior enfoque nas perturbações na amplitude da tensão e nas distorções na forma de onda, mostrando suas principais causas e meios de contorná-las. No primeiro caso, são registrados transitórios, interrupções, afundamentos e elevações de tensão, feitas as devidas análises, e avaliadas suas influências em equipamentos por meio da Curva ITI (CBEMA), a qual possibilita a determinação de possíveis danos ou falhas nos mesmos. No segundo caso, nos diversos pontos de medição é avaliada a presença de harmônicas, tanto pela análise das formas de onda e de seus conteúdos espectrais como pela taxa de distorção harmônica num período de uma semana. Por fim, são estudadas teorias de potências elétricas trifásicas, em especial a Teoria pq de Potências Instantâneas, importante na aplicação de filtros ativos, cuja função é atenuar as correntes harmônicas geradas por cargas não lineares. Os dados reais medidos das tensões e correntes instantâneas foram submetidos a um programa computacional desenvolvido a partir do modelo matemático de um filtro ativo com compensação paralela e método de compensação baseado na Teoria pq Modificada de Potências Instantâneas, obtendo-se como resposta o desempenho do filtro na eliminação das harmônicas nas correntes vistas pela fonte de alimentação. / Abstract: This work deals with two issues of large relevance, especially in recent years about electric power: energy economy and power quality. The studies are based on data collected by various measurement and energy management instruments at different points in the Campinas State University Campus (Unicamp), in São Paulo State, Brazil. The performance of energy relates to its more efficiently use and without wasting, which is important to increase the amount of available energy, without large investments in generation, transmission and distribution, thereby reducing environmental impacts. A Project has been developed, named Ecogera, whose purpose is to evaluate the energy efficiency, through a program of rational use and development of alternative sources of energy. The module of energy economy is discussed here, developed in units of consumption with typical characteristics for the type of work performed at the university, focusing on the reduction of lighting consumption. A good power quality refers to the absence of abnormal variations in voltage, related to continuity of supply and the sinusoidal waveform of the power supply. The power quality problems have been increased over the years, mainly due to the increase of nonlinear loads, the increased sensitivity of the equipment and the large interconnection of the power networks, and can result in misoperation or damage of the devices. A greater focus is given on the voltage amplitude disturbances and the distortion in the waveform, showing its main causes and means of overcoming them. In the first case transients, interruptions, sags and swells are recorded, adequate analysis are done, and their influence on the equipment are evaluated by the ITI Curve (CBEMA), which enables the determination of possible damage or failures in them. In the second case, the presence of harmonics is evaluated in the various points of measurement, either by the analysis of waveforms and its spectral content or by the total harmonic distortion over a one-week period. Finally, tree-phase electrical power theories are studied, especially the Instantaneous pq Power Theory, which is important in the application of active filters, whose function is to reduce the harmonic currents generated by nonlinear loads. The real measured data of the instantaneous voltages and currents was put in a computacional program developed from the mathematical model of an active filter with parallel compensation and using a compensation method based on the Power Instantaneous Modified pq Theory and its influence seem by the current supply is obtained by the harmonic eliminations. / Mestrado / Energia Eletrica / Mestre em Engenharia Elétrica