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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Finding a representative day for simulation analyses

Watson, Jebulan Ryan 23 November 2009 (has links)
Many models exist in the aerospace industry that attempt to replicate the National Airspace System (NAS). The complexity of the NAS makes it a system that can be modeled in a variety of ways. While some NAS models are very detailed and take many factors into account, runtime of these simulations can be on the magnitude of hours (to simulate a single day). Other models forgo details in order to decrease the runtime of their simulation. Most models are capable of simulating a 24 hour period in the NAS. An analysis of an entire year would mean running the simulation for every day in the year, which would result in a long run time. The following thesis work presents a tool that is capable of giving the user a day that can be used in a simulation and will produce results similar to simulating the entire year. Taking in parameters chosen by the user, the tool outputs a single day, multiple days, or a composite day (based on percentages of days). Statistical methods were then used to compare each day to the overall year. On top of finding a single representative day, the ability to find a composite day was added. After implementing a brute force search technique to find the composite day, the long runtime was deemed inconvenient for the user. To solve this problem, a heuristic search method was created that would search the solution space in a short time and still output a composite day that represented the year. With a short runtime, the user would be able to run the program multiple times. Once the heuristic method was implemented, it was found that it performed well enough to make it an option for the user to choose. The final version of this tool was used to find a representative day and the result was used in comparison with output data from a NAS simulation model. Because the tool found the representative day based on historical data, it could be used to validate the effectiveness of the simulation model. The following thesis will go into detail about how this tool, the Representative Day Finder, was created.
2

Aplicação da climatologia dinâmica ao estudo do comportamento térmico das edificações, caso específico: telhas produzidas a partir da reciclagem de caixas acartonadas / Application of a dynamic climatology to study thetermal behavior of buildings, specific case: tiles produced from the recycling carton boxes

Herrera, Jaime Andrés Quiroa 17 July 2008 (has links)
Nesta investigação aprofundou se no estudo do comportamento térmico das telhas Ibaplac, fabricada com embalagens pós consumo de Tetra Pak®, fazendo um estudo comparativo com outros sistemas construtivos de cobertura convencionais. O projeto enfoca o estudo térmico da cobertura, já que esta é uma parte da construção que recebe e absorve grande quantidade de energia pela radiação solar, influindo diretamente na temperatura interna da edificação podendo provocar temperaturas internas de desconforto. Isso que pode ocasionar prejuízo na saúde dos usuários, e também na economia, pela utilização aparelhos de condicionamento do ar interior para eliminar o desconforto térmico provocando maior consumo de energia. O estudo foi realizado por meio da instalação de equipamentos que coletam os dados de temperatura automaticamente. Foram monitorados diferentes espaços do interior de quatro células de teste e um protótipo de habitação popular ocupado. Foi selecionado um dia representativo das condições climáticas para análise, das temperaturas superficiais e do ar interior. Foram comparados os resultados das quatro células de teste (telha Ibaplac-forro madeira, telha Ibaplac-forro laje cerâmica, telha fibrocimento-forro laje cerâmica, telha cerâmica laje cerâmica), e do protótipo (telha Ibaplac-forro Ibaplac) para caracterizar o comportamento térmico num dia quente do sistema de cobertura em estudo. A análise dos dados obtidos com respeito ao comportamento térmico dos sistemas de cobertura em estudo foi realizada de acordo com a sua resposta térmica no dia representativo, determinada pela análise do período de medições. Também se utilizou das planilhas e gráficos elaborados a partir dos dados coletados pelo sistema automático de aquisição de dados datalogger CR10X e das imagens do satélite GOES obtidas na internet. No final foi feita a comparação do comportamento térmico dos diferentes sistemas de cobertura se levantando as conclusões finais, determinando assim o comportamento das telhas fabricadas com material reciclado Tetra Pak® em relação aos materiais convencionais estudados paralelamente. / In this research deepened the study of the thermal behavior of tiles Ibaplac, made with used packages of Tetra Pak®, making a comparative study with other conventional systems of roofs. The project mainly focuses on the thermal study cover, because this is a part of a building that receives and absorbs large amounts of energy by solar radiation, directly influencing the internal temperature of the building and this can cause internal temperatures of discomfort, which can even cause injury on the health of users, and also the economy, for the use of internal air-conditioning equipment in order to eliminate the thermal discomfort causing higher consumption of energy. The study was conducted by the installation of equipment that collects data from temperature automatically. They were monitored different areas of the interior of four experimental cells and a test prototype of popular house occupied. Was selected a representative day for the climate analysis, of the surface temperatures and internal air temperatures. The temperature results of the four test cells (Ibaplac tile-wood ceiling, Ibaplac tile-ceramic ceiling, asbestos tile-ceramic ceiling, ceramic tile-ceramic ceiling), and the prototype (Ibaplac tile-Ibaplac ceiling) was compared in order to determine the thermal behavior on heat of the roofs systems, compared an alternative roof system with an conventional roof systems, also analyzed in this research. .A data analysis of the thermal behavior of the roof systems under study was conducted in accordance with its thermal response in heat representative day, determined for examining period of measurements, in addition to the use of excel spreadsheets and graphics compiled from data collected by the automatically acquisition system of data \"datalogger CR10X\" and satellite GOES images obtained from the Internet. At the end were compared the thermal behavior results of the different roof systems in order to get the final conclusions, thereby determining the behavior of tiles made from recycled material Tetra Pak® in comparison with a conventional system of roofs studied parallel.
3

Aplicação da climatologia dinâmica ao estudo do comportamento térmico das edificações, caso específico: telhas produzidas a partir da reciclagem de caixas acartonadas / Application of a dynamic climatology to study thetermal behavior of buildings, specific case: tiles produced from the recycling carton boxes

Jaime Andrés Quiroa Herrera 17 July 2008 (has links)
Nesta investigação aprofundou se no estudo do comportamento térmico das telhas Ibaplac, fabricada com embalagens pós consumo de Tetra Pak®, fazendo um estudo comparativo com outros sistemas construtivos de cobertura convencionais. O projeto enfoca o estudo térmico da cobertura, já que esta é uma parte da construção que recebe e absorve grande quantidade de energia pela radiação solar, influindo diretamente na temperatura interna da edificação podendo provocar temperaturas internas de desconforto. Isso que pode ocasionar prejuízo na saúde dos usuários, e também na economia, pela utilização aparelhos de condicionamento do ar interior para eliminar o desconforto térmico provocando maior consumo de energia. O estudo foi realizado por meio da instalação de equipamentos que coletam os dados de temperatura automaticamente. Foram monitorados diferentes espaços do interior de quatro células de teste e um protótipo de habitação popular ocupado. Foi selecionado um dia representativo das condições climáticas para análise, das temperaturas superficiais e do ar interior. Foram comparados os resultados das quatro células de teste (telha Ibaplac-forro madeira, telha Ibaplac-forro laje cerâmica, telha fibrocimento-forro laje cerâmica, telha cerâmica laje cerâmica), e do protótipo (telha Ibaplac-forro Ibaplac) para caracterizar o comportamento térmico num dia quente do sistema de cobertura em estudo. A análise dos dados obtidos com respeito ao comportamento térmico dos sistemas de cobertura em estudo foi realizada de acordo com a sua resposta térmica no dia representativo, determinada pela análise do período de medições. Também se utilizou das planilhas e gráficos elaborados a partir dos dados coletados pelo sistema automático de aquisição de dados datalogger CR10X e das imagens do satélite GOES obtidas na internet. No final foi feita a comparação do comportamento térmico dos diferentes sistemas de cobertura se levantando as conclusões finais, determinando assim o comportamento das telhas fabricadas com material reciclado Tetra Pak® em relação aos materiais convencionais estudados paralelamente. / In this research deepened the study of the thermal behavior of tiles Ibaplac, made with used packages of Tetra Pak®, making a comparative study with other conventional systems of roofs. The project mainly focuses on the thermal study cover, because this is a part of a building that receives and absorbs large amounts of energy by solar radiation, directly influencing the internal temperature of the building and this can cause internal temperatures of discomfort, which can even cause injury on the health of users, and also the economy, for the use of internal air-conditioning equipment in order to eliminate the thermal discomfort causing higher consumption of energy. The study was conducted by the installation of equipment that collects data from temperature automatically. They were monitored different areas of the interior of four experimental cells and a test prototype of popular house occupied. Was selected a representative day for the climate analysis, of the surface temperatures and internal air temperatures. The temperature results of the four test cells (Ibaplac tile-wood ceiling, Ibaplac tile-ceramic ceiling, asbestos tile-ceramic ceiling, ceramic tile-ceramic ceiling), and the prototype (Ibaplac tile-Ibaplac ceiling) was compared in order to determine the thermal behavior on heat of the roofs systems, compared an alternative roof system with an conventional roof systems, also analyzed in this research. .A data analysis of the thermal behavior of the roof systems under study was conducted in accordance with its thermal response in heat representative day, determined for examining period of measurements, in addition to the use of excel spreadsheets and graphics compiled from data collected by the automatically acquisition system of data \"datalogger CR10X\" and satellite GOES images obtained from the Internet. At the end were compared the thermal behavior results of the different roof systems in order to get the final conclusions, thereby determining the behavior of tiles made from recycled material Tetra Pak® in comparison with a conventional system of roofs studied parallel.

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