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Řízené vytápění kompozitního materiálu / Controlled heating of Composite MaterialFajkus, Martin January 2010 (has links)
The supposed thesis considers problem of heating of composite material for outdoor application. Basement of thesis is analysis of submitted sample of composite material. Measured values of composite material were compared and evaluated and than acceptable samples were choosen for next application. Part of thesis is creation of measuring software for analysis of sample. Other part of thesis is realization of equipment of control unit for heating of composite material. Control unit makes it possible to regulate heating and to set up parameters from computer.
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Multistage tower performance for a desalinator controlled by eletric energy / Desempenho de uma torre multiestÃgios para um dessalinizador controlado a energia elÃtricaFelipe Alves Albuquerque AraÃjo 16 February 2016 (has links)
nÃo hà / Solar desalination plants are used for water treatment using solar radiation as an energy source, but its incidence varies, either in terms of time, the weather, the seasons or the presence of clouds. These factors complicate the understanding of the process variables influence and constructive geometric parameters. In this work, the experimental results, obtained by operation with a thermal desalination unit with heat recovery, are presented. The process occurs by controlled heating, by electricity flowing through a resistance present at the base of desalination tower (storage tank). In addition to the tank, the tower also comprises stages, consisting of polyurethane profiles, to prevent heat loss to the external environment, and aluminum trays in W format, through which flows the water generated by the steam condensation from the next lower stage. On the sides of each stage profiles, there are condensate collection gutters connected to hoses that lead the produced fluid to collection canisters. The production of desalinated water, with the use of a hydrophobic film on the bottom of the aluminum trays, where the condensate drains, was evaluated. Also biological, physical and chemical, chromatographic and spectrometric tests were conducted in order to verify the quality of the water produced. The best desalinator operating condition of the study, with the maximum output gain ratio (GOR) for the system of 7.92, was obtained with a potential difference of 120V, 600W power and five stages in the desalination tower. The film did not increase the water production, but it was also not observed contamination of water samples by the hydrophobic product. / Dessalinizadores solares sÃo empregados para tratamento de Ãgua utilizando-se a radiaÃÃo solar como fonte de energia, porÃm sua incidÃncia varia, seja em funÃÃo do horÃrio, do clima, das estaÃÃes do ano ou da presenÃa de nuvens, o que dificulta o conhecimento da influÃncia das variÃveis de processo e dos parÃmetros geomÃtricos construtivos. Nesta dissertaÃÃo, os resultados experimentais, obtidos atravÃs de operaÃÃo com um dessalinizador tÃrmico, com recuperaÃÃo de calor, sÃo apresentados. O processo ocorre por meio de aquecimento controlado, atravÃs de energia elÃtrica que passa por uma resistÃncia presente na base da torre de dessalinizaÃÃo (tanque de armazenamento). AlÃm do tanque, a torre tambÃm à composta por estÃgios, que consistem em perfis de poliuretano, para evitar a perda de calor com o meio externo, e bandejas de alumÃnio, em formato de W, por onde escoa a Ãgua gerada pela condensaÃÃo do vapor proveniente do estÃgio imediatamente inferior. Nas laterais dos perfis de cada estÃgio, existem calhas de coleta do condensado, ligadas a mangueiras que conduzem o lÃquido produzido a vasilhas de coleta. Avaliou-se a produÃÃo de Ãgua dessalinizada com o uso de uma pelÃcula hidrofÃbica, na parte inferior das bandejas de alumÃnio, por onde o condensado escoa. TambÃm foram realizados testes biolÃgicos, fÃsico-quÃmicos, cromatogrÃficos e espectromÃtricos, a fim de verificar a qualidade da Ãgua produzida. A melhor condiÃÃo de operaÃÃo do dessalinizador em estudo, com mÃxima RazÃo de Ganho de SaÃda (GOR) para o sistema, de 7,92, foi obtida com uma diferenÃa de potencial de 120V, potÃncia de 600W e cinco estÃgios na torre de dessalinizaÃÃo. A pelÃcula nÃo aumentou a produÃÃo de Ãgua, mas tambÃm nÃo foi constatada contaminaÃÃo das amostras de Ãgua pelo produto hidrofÃbico.
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