Made available in DSpace on 2014-12-17T13:57:19Z (GMT). No. of bitstreams: 1 SilenoCT.pdf: 2677839 bytes, checksum: ab606ee9a9e47606999ca5cf548141a6 (MD5) Previous issue date: 2006-12-08 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Natural air ventilation is the most import passive strategy to provide thermal comfort in hot and humid climates and a significant low energy strategy. However, the natural ventilated building requires more attention with the architectural design than a conventional building with air conditioning systems, and the results are less reliable. Therefore, this thesis focuses on softwares and methods to predict the natural ventilation performance from the point of view of the architect, with limited resource and knowledge of fluid mechanics. A typical prefabricated building was modelled due to its simplified geometry, low cost and occurrence at the local campus. Firstly, the study emphasized the use of computational fluid dynamics (CFD) software, to simulate the air flow outside and inside the building. A series of approaches were developed to make the simulations possible, compromising the results fidelity. Secondly, the results of CFD simulations were used as the input of an energy tool, to simulate the thermal performance under different rates of air renew. Thirdly, the results of temperature were assessed in terms of thermal comfort. Complementary simulations were carried out to detail the analyses. The results show the potentialities of these tools. However the discussions concerning the simplifications of the approaches, the limitations of the tools and the level of knowledge of the average architect are the major contribution of this study / A ventila??o natural se constitui no principal recurso passivo para obten??o do conforto t?rmico em climas quentes e ?midos, al?m de promover a redu??o do consumo energ?tico com condicionamento artificial. Entretanto, existem restri??es ao seu uso por parte dos arquitetos por n?o haver garantias de que ela possa resolver os problemas de conforto t?rmico, quando comparada aos sistemas artificiais. Nesse sentido, decidiu-se investigar formas de prever o comportamento da ventila??o natural atrav?s de ferramentas de simula??o computacional, visando auxiliar a decis?o arquitet?nica. O objeto de estudo ? o edif?cio pr?fabricado tipo galp?o devido ?s suas caracter?sticas geom?tricas e ? freq??ncia de uso na regi?o, especificamente no campus universit?rio central da UFRN. Foi utilizado um programa de din?mica de fluidos (Computational Fluid Dynamics - CFD) e um de simula??o do comportamento t?rmico e energ?tico de edifica??es (energy tool - ET). A pesquisa priorizou a discuss?o dos procedimentos necess?rios para viabilizar as an?lises da ventila??o em galp?es. Durante seu desenvolvimento, ? mostrado como o m?todo teve que ser adequado ? complexidade de sucessivas abordagens, resultando em simplifica??es e incertezas de resultados. Para exemplificar a abordagem s?o apresentados alguns resultados de simula??es. Ao final, as limita??es e potencialidades do m?todo s?o discutidas com base nas caracter?sticas dos c?digos de simula??es utilizados, das condi??es de simula??o e da representatividade dos modelos

Made available in DSpace on 2014-12-17T14:09:16Z (GMT). No. of bitstreams: 1 JoseCSJ_TESE_PARCIAL.pdf: 3198681 bytes, checksum: 3124bf4fcf475e3c972bb5266fef2405 (MD5) Previous issue date: 2013-02-20 / Steam injection is a method usually applied to very viscous oils and consists of injecting heat to reduce the viscosity and, therefore, increase the oil mobility, improving the oil production. For designing a steam injection project it is necessary to have a reservoir simulation in order to define the various parameters necessary for an efficient heat reservoir management, and with this, improve the recovery factor of the reservoir. The purpose of this work is to show the influence of the coupled wellbore/reservoir on the thermal simulation of reservoirs under cyclic steam stimulation. In this study, the methodology used in the solution of the problem involved the development of a wellbore model for the integration of steam flow model in injection wellbores, VapMec, and a blackoil reservoir model for the injection of cyclic steam in oil reservoirs. Thus, case studies were developed for shallow and deep reservoirs, whereas the usual configurations of injector well existing in the oil industry, i.e., conventional tubing without packer, conventional tubing with packer and insulated tubing with packer. A comparative study of the injection and production parameters was performed, always considering the same operational conditions, for the two simulation models, non-coupled and a coupled model. It was observed that the results are very similar for the specified well injection rate, whereas significant differences for the specified well pressure. Finally, on the basis of computational experiments, it was concluded that the influence of the coupled wellbore/reservoir in thermal simulations using cyclic steam injection as an enhanced oil recovery method is greater for the specified well pressure, while for the specified well injection rate, the steam flow model for the injector well and the reservoir may be simulated in a non- coupled way / A inje??o de vapor ? um m?todo aplicado geralmente em ?leos muito viscosos e consiste em injetar calor para reduzir a viscosidade e, portanto, aumentar a mobilidade do ?leo, resultando em incremento na produ??o dos po?os. Para o planejamento de um projeto de inje??o de vapor ? necess?rio efetuar um estudo de reservat?rio com o objetivo de se definir os v?rios par?metros necess?rios para um eficiente gerenciamento de calor no meio poroso e, com isto, melhorar o fator de recupera??o do reservat?rio. Neste estudo, para o sistema de inje??o, representado pelo po?o injetor, ? normalmente adotado um modelo padr?o em todos os casos estudados, sendo desta forma, a integra??o entre o po?o injetor e o reservat?rio, realizada de forma bastante simplificada. Este trabalho tem como objetivo mostrar a influ?ncia do acoplamento do po?o injetor nas simula??es t?rmicas de reservat?rios submetidos ? inje??o c?clica de vapor. Neste estudo, a metodologia utilizada na solu??o do problema envolveu o desenvolvimento de um modelo de po?o para a integra??o do modelo de escoamento de vapor em po?os de petr?leo, VapMec, e o modelo de reservat?rio tipo beta para a inje??o c?clica de vapor em reservat?rios de petr?leo. Assim, desenvolveram-se estudos de caso para reservat?rios rasos e profundos, considerando as principais configura??es de po?o injetor existentes na ind?stria de petr?leo, ou seja, coluna convencional sem packer, coluna convencional com packer e coluna isolada com packer. Foi realizado um estudo comparativo dos par?metros de inje??o e produ??o obtidos na simula??o, considerando sempre as mesmas condi??es de opera??o, para os dois modelos de simula??o, sendo um modelo n?o acoplado e o outro modelo acoplado. Observou-se que os resultados entre os modelos s?o bastante similares para a situa??o de vaz?o de inje??o igual ? vaz?o especificada, tendo sido encontrado diferen?as significativas na situa??o em que a press?o de inje??o ? igual ? press?o especificada. Finalmente, com base nos experimentos computacionais, foi poss?vel concluir que a influ?ncia do acoplamento do po?o injetor nos estudos de reservat?rios que utilizam a inje??o c?clica de vapor como m?todo especial de recupera??o ? maior para a condi??o de press?o especificada, sendo que para a condi??o de vaz?o especificada, o modelo de escoamento no po?o injetor e o modelo do reservat?rio podem ser simulados de forma n?o integrada

Made available in DSpace on 2015-03-03T15:04:51Z (GMT). No. of bitstreams: 1 JoeltonFB_DISSERT.pdf: 887273 bytes, checksum: d3d21c6f9340a0a9d396b1c840cef67e (MD5) Previous issue date: 2013-09-19 / The chart of control of Hotelling T2 has been the main statistical device used in monitoring multivariate processes. Currently the technological development of control systems and automation enabled a high rate of collection of information of the production systems in very short time intervals, causing a dependency between the results of observations. This phenomenon known as auto correlation causes in the statistical control of the multivariate processes a high rate of false alarms, prejudicing in the chart performance. This entails the violation of the assumption of independence and normality of the distribution. In this thesis we considered not only the correlation between two variables, but also the dependence between observations of the same variable, that is, auto correlation. It was studied by simulation, the bi variate case and the effect of auto correlation on the performance of the T2 chart of Hotelling. / O grafico de controle T2 de Hotelling tem sido o principal dispositivo estat?stico utilizado no monitoramento de processos multivariados. Atualmente com o desenvolvimento tecnol?gico dos sistemas de controle e automa??o possibilitou uma elevada taxa de coletas das informa??es dos sistemas produtivos em intervalos de tempo muito curto, provocando uma depend?ncia entre os resultados das observa??es. Este fen?meno conhecido como autocorrela??o provoca no controle estat?stico de processos multivariado uma grande quantidade de alarmes falsos, prejudicando no desempenho do gr?fico. Isto acarreta na viola??o do pressuposto de independ?ncia e da normalidade da distribui??o. Nesta disserta??o considerou-se n?o s? a correla??o entre duas vari?veis, mas tamb?m a depend?ncia entre observa??es de uma mesma vari?vel, isto e, a autocorrela??o. Estudou-se, por meio de simula??o, o caso bivariado e o efeito da autocorrela??o no desempenho do gr?fico T2 de Hotelling

Made available in DSpace on 2015-03-13T17:08:22Z (GMT). No. of bitstreams: 1 Flavio_LS.pdf: 1955029 bytes, checksum: 8e0fa408c324ef805ccd084d89be3a06 (MD5) Previous issue date: 2005-07-15 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / The history match procedure in an oil reservoir is of paramount importance in order to obtain a characterization of the reservoir parameters (statics and dynamics) that implicates in a predict production more perfected. Throughout this process one can find reservoir model parameters which are able to reproduce the behaviour of a real reservoir.Thus, this reservoir model may be used to predict production and can aid the oil file management. During the history match procedure the reservoir model parameters are modified and for every new set of reservoir model parameters found, a fluid flow simulation is performed so that it is possible to evaluate weather or not this new set of parameters reproduces the observations in the actual reservoir. The reservoir is said to be matched when the discrepancies between the model predictions and the observations of the real reservoir are below a certain tolerance. The determination of the model parameters via history matching requires the minimisation of an objective function (difference between the observed and simulated productions according to a chosen norm) in a parameter space populated by many local minima. In other words, more than one set of reservoir model parameters fits the observation. With respect to the non-uniqueness of the solution, the inverse problem associated to history match is ill-posed. In order to reduce this ambiguity, it is necessary to incorporate a priori information and constraints in the model reservoir parameters to be determined. In this dissertation, the regularization of the inverse problem associated to the history match was performed via the introduction of a smoothness constraint in the following parameter: permeability and porosity. This constraint has geological bias of asserting that these two properties smoothly vary in space. In this sense, it is necessary to find the right relative weight of this constrain in the objective function that stabilizes the inversion and yet, introduces minimum bias. A sequential search method called COMPLEX was used to find the reservoir model parameters that best reproduce the observations of a semi-synthetic model. This method does not require the usage of derivatives when searching for the minimum of the objective function. Here, it is shown that the judicious introduction of the smoothness constraint in the objective function formulation reduces the associated ambiguity and introduces minimum bias in the estimates of permeability and porosity of the semi-synthetic reservoir model / O processo de ajuste de hist?rico de produ??o em um reservat?rio de petr?leo ? de fundamental import?ncia para que se possa obter uma caracteriza??o dos par?metros do reservat?rio (est?ticos e din?micos) que implique em uma previs?o de produ??o mais acurada. Atrav?s deste processo pode-se encontrar par?metros para um modelo de reservat?rio que sejam capazes de reproduzir o comportamento do reservat?rio real. Assim, esse modelo de reservat?rio pode ser utilizado em previs?es de produ??o e no aux?lio ao gerenciamento do campo de ?leo/g?s. No processo de ajuste de hist?rico, os par?metros do modelo do reservat?rio s?o modificados e para cada modelo com o novo conjunto de par?metros, uma simula??o de fluxo ? realizada para que se possa avaliar se este conjunto reproduz ou n?o as curvas de produ??o de um reservat?rio real. O reservat?rio ? ajustado quando as discrep?ncias entre as previs?es do modelo de reservat?rio e a do reservat?rio real s?o abaixo de certa toler?ncia. Determinar um modelo de reservat?rio por meio do processo de ajuste de hist?rico requer a minimiza??o de uma fun??o objetivo (diferen?a entre a produ??o observada e simulada) em um espa?o de par?metros que em geral possui muitos m?nimos, ou seja, mais de um modelo de reservat?rio ajusta as observa??es. No sentido da n?o-unicidade da solu??o, o problema inverso associado ao processo de ajuste de hist?rico ? mal-posto. A fim de reduzir esta ambig?idade e regularizar o problema, ? necess?ria a incorpora??o de informa??es a priori e de v?nculos nos par?metros do reservat?rio a serem determinados. Neste trabalho, a regulariza??o do problema inverso associado ao ajuste de hist?rico foi realizada por meio da introdu??o de um v?nculo de suavidade nos par?metros: porosidade e permeabilidade, de um reservat?rio. Esse v?nculo possui o vi?s geol?gico de que os valores de porosidade e permeabilidade variam suavemente ao longo do reservat?rio. Nesse sentido, ? necess?rio encontrar um valor do peso deste v?nculo, na fun??o objetivo, que estabilize o problema e ainda introduza nos par?metros do modelo de reservat?rio o menor vi?s geol?gico poss?vel

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-01-04T22:04:54Z No. of bitstreams: 1 ErnestoVargasBautista_TESE.pdf: 4056194 bytes, checksum: 4254be419758b8c4d81ac80a522fc9b3 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-01-07T21:31:17Z (GMT) No. of bitstreams: 1 ErnestoVargasBautista_TESE.pdf: 4056194 bytes, checksum: 4254be419758b8c4d81ac80a522fc9b3 (MD5) / Made available in DSpace on 2016-01-07T21:31:17Z (GMT). No. of bitstreams: 1 ErnestoVargasBautista_TESE.pdf: 4056194 bytes, checksum: 4254be419758b8c4d81ac80a522fc9b3 (MD5) Previous issue date: 2014-11-13 / A distribui??o e mobiliza??o ou n?o dos fluidos num meio poroso dependem das for?as capilar, viscosa e gravitacional. Em campo, os processos de recupera??o avan?ada de ?leo envolvem a import?ncia e a altera??o destas for?as para incrementar o fator de recupera??o de ?leo. No caso do processo de drenagem gravitacional assistida por g?s (GAGD ? GasAssisted Gravity Drainage) ? importante entender a f?sica e mecanismos que mobilizam o ?leo atrav?s da intera??o destas for?as. Para isso, v?rios autores desenvolveram modelos f?sicos em escala de laborat?rio e testemunhos do GAGD para estudar o desempenho destas for?as atrav?s de grupos adimensionais. Estes modelos apresentaram resultados conclusivos. Por?m, modelos de simula??o num?rica foram pouco usados. O objetivo deste trabalho ? estudar a inter-rela??o das for?as capilar, viscosa e gravitacional no GAGD e suas influ?ncias no fator de recupera??o de ?leo atrav?s de um modelo de simula??o num?rica 2D. Para analisar cada uma dessas for?as, foram usados os grupos adimensionais reportados na literatura, N?mero Capilar (Nc), N?mero de Bond (Nb) e N?mero Gravitacional (Ng). Uma compara??o dos resultados obtidos neste trabalho tamb?m foi realizada com os resultados da literatura. Os resultados mostraram que antes da erup??o do g?s injetado, quanto menor ? o Nc e Nb, maior ? a recupera??o de ?leo, e ap?s da erup??o, quanto menor ? o Ng, maior ? a recupera??o de ?leo no GAGD. Uma boa rela??o foi encontrada entre os resultados deste trabalho e os resultados publicados na literatura / The distribution and mobilization of fluid in a porous medium depend on the capillary, gravity, and viscous forces. In oil field, the processes of enhanced oil recovery involve change and importance of these forces to increase the oil recovery factor. In the case of gas assisted gravity drainage (GAGD) process is important to understand the physical mechanisms to mobilize oil through the interaction of these forces. For this reason, several authors have developed physical models in laboratory and core floods of GAGD to study the performance of these forces through dimensionless groups. These models showed conclusive results. However, numerical simulation models have not been used for this type of study. Therefore, the objective of this work is to study the performance of capillary, viscous and gravity forces on GAGD process and its influence on the oil recovery factor through a 2D numerical simulation model. To analyze the interplay of these forces, dimensionless groups reported in the literature have been used such as Capillary Number (Nc), Bond number (Nb) and Gravity Number (Ng). This was done to determine the effectiveness of each force related to the other one. A comparison of the results obtained from the numerical simulation was also carried out with the results reported in the literature. The results showed that before breakthrough time, the lower is the injection flow rate, oil recovery is increased by capillary force, and after breakthrough time, the higher is the injection flow rate, oil recovery is increased by gravity force. A good relationship was found between the results obtained in this research with those published in the literature. The simulation results indicated that before the gas breakthrough, higher oil recoveries were obtained at lower Nc and Nb and, after the gas breakthrough, higher oil recoveries were obtained at lower Ng. The numerical models are consistent with the reported results in the literature

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-01-26T21:31:59Z No. of bitstreams: 1 JhonMoronTarifa_DISSERT.pdf: 6817189 bytes, checksum: 7bd9115ec364a2c40e8f294d8dd1dcb2 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-02-02T19:37:55Z (GMT) No. of bitstreams: 1 JhonMoronTarifa_DISSERT.pdf: 6817189 bytes, checksum: 7bd9115ec364a2c40e8f294d8dd1dcb2 (MD5) / Made available in DSpace on 2016-02-02T19:37:55Z (GMT). No. of bitstreams: 1 JhonMoronTarifa_DISSERT.pdf: 6817189 bytes, checksum: 7bd9115ec364a2c40e8f294d8dd1dcb2 (MD5) Previous issue date: 2014-12-15 / A combust?o in situ (CIS) ? o m?todo de recupera??o t?rmico mais antigo. Este m?todo consiste na queima parcial do ?leo in situ, cujo objetivo ? gerar uma frente de combust?o que ajude no movimento do ?leo. Essa frente de combust?o aquece as zonas pr?ximas, logrando a redu??o da viscosidade do ?leo e permitindo o seu deslocamento at? o po?o produtor. Apesar de parecer um processo f?cil, a combust?o in situ engloba uma s?rie de mecanismos complexos que mesmo na atualidade a torna dif?cil de representar atrav?s de modelos anal?ticos, f?sicos e de simula??o num?rica. O objetivo do trabalho ? analisar e determinar os par?metros que t?m influ?ncia no processo, destacando a cin?tica (energia de ativa??o, coeficiente de Arrhenius e porcentagem de craqueamento para a produ??o de coque durante o processo) de tr?s diferentes modelos de rea??es qu?micas e da vaz?o de inje??o do ar. Para verificar a aplicabilidade do processo no Brasil foi realizado um estudo de simula??o em reservat?rios de ?leo pesado com caracter?sticas do Nordeste Brasileiro. As simula??es foram realizadas utilizando o m?dulo ?STARS? da ?Computer Modelling Group?, com o objetivo de realizar estudos de m?todos de recupera??o avan?ada de ?leo. Dentre todos os par?metros analisados, a energia de ativa??o-fator pr?-exponencial apresentou a maior influ?ncia, ou seja, quanto menor o valor da energia de ativa??o-fator pr?-exponencial maior a fra??o de ?leo recuperada. A porcentagem de craqueamento mostrou uma forte influ?ncia no processo, devido a que enquanto menor for a quantidade de coque formado maior ? volume de ?leo recuperado. / In situ Combustion (CIS) is the oldest thermal method of oil recovery. This method consists of partial combustion of in situ oil, its goal is to generate a combustion front that helps to move the oil. This combustion front will heat the surrounding areas, achieving a reduction in oil viscosity and allowing its displacement into the production well. It may seem a simple process, however in situ combustion involves a series of complex mechanisms that difficult until today its representation through analytical models, physical models and numerical simulation. The aim of this investigation is to analyze and determine the parameters that influence the process, highlighting the kinetics of the process (activation energy, Arrhenius coefficient and percentage of cracking for the production of coke) three different models of chemical reactions and the air injection rate. To verify the applicability of the process in Brazil a simulation study was conducted in heavy oil reservoirs with characteristics of the Brazilian Northeast. The simulations were performed using the "STARS" module from the "Computer Modelling Group", which objective is to study methods of enhanced oil recovery. Among all the analyzed parameters, the activation energy-pre-exponential factor showed the greatest influence, that is, the lower the value of the activation energy-preexponential factor the higher the fraction of oil recovery. The cracking percentage also showed a strong influence in the process, the smaller the amount of coke formed the larger volume of oil recovery.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-03-10T20:31:31Z No. of bitstreams: 1 AnaCarlaCostaAndrade_DISSERT.pdf: 4395616 bytes, checksum: 7bd9d9d5693c356b8df430de0f64bae2 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-03-17T19:21:33Z (GMT) No. of bitstreams: 1 AnaCarlaCostaAndrade_DISSERT.pdf: 4395616 bytes, checksum: 7bd9d9d5693c356b8df430de0f64bae2 (MD5) / Made available in DSpace on 2016-03-17T19:21:33Z (GMT). No. of bitstreams: 1 AnaCarlaCostaAndrade_DISSERT.pdf: 4395616 bytes, checksum: 7bd9d9d5693c356b8df430de0f64bae2 (MD5) Previous issue date: 2015-05-29 / Uma das diversas t?cnicas aplicadas aos processos de produ??o de petr?leo ? a eleva??o artificial, que utiliza equipamentos a fim de reduzir a press?o de fluxo no fundo do po?o, promovendo um diferencial de press?o, resultando em um aumento de vaz?o. A escolha do m?todo de eleva??o artificial depende de uma an?lise de diversos fatores, como custos iniciais de instala??o, manuten??o e condi??es existentes no campo produtor. O m?todo de Bombeio Centr?fugo Submerso (BCS) mostra-se bastante eficiente quando a finalidade ? produzir altas vaz?es de l?quido, tanto em ambientes terrestres como mar?timos, em condi??es adversas de temperatura e na presen?a de fluidos viscosos. Por defini??o, o BCS ? um m?todo de eleva??o artificial em que um motor el?trico de subsuperf?cie transforma a energia el?trica em mec?nica para acionar uma bomba centr?fuga de m?ltiplos est?gios sobrepostos, formada por um impelidor (rotor) e um difusor (estator). A bomba converte a energia mec?nica do motor em energia cin?tica sob a forma de velocidade, elevando o fluido ? superf?cie. O objetivo desse trabalho ? a implementa??o do m?todo de otimiza??o dos poliedros flex?veis, conhecido como M?todo Simplex Modificado (MSM), aplicado ao estudo da influ?ncia na modifica??o dos par?metros de entrada e sa?da no canal do impelidor de uma bomba centr?fuga de um sistema BCS. Na utiliza??o do m?todo de otimiza??o modificando os par?metros angulares da bomba, os dados resultantes aplicados nas simula??es permitiram a obten??o de valores otimizados do Head (altura de eleva??o), uma efici?ncia sem perdas e a pot?ncia com resultados diferenciados. / One of several techniques applied to production processes oil is the artificial lift, using equipment in order to reduce the bottom hole pressure, providing a pressure differential, resulting in a flow increase. The choice of the artificial lift method depends on a detailed analysis of the some factors, such as initial costs of installation, maintenance, and the existing conditions in the producing field. The Electrical Submersible Pumping method (ESP) appears to be quite efficient when the objective is to produce high liquid flow rates in both onshore and offshore environments, in adverse conditions of temperature and in the presence of viscous fluids. By definition, ESP is a method of artificial lift in which a subsurface electric motor transforms electrical into mechanical energy to trigger a centrifugal pump of multiple stages, composed of a rotating impeller (rotor) and a stationary diffuser (stator). The pump converts the mechanical energy of the engine into kinetic energy in the form of velocity, which pushes the fluid to the surface. The objective of this work is to implement the optimization method of the flexible polyhedron, known as Modified Simplex Method (MSM) applied to the study of the influence of the modification of the input and output parameters of the centrifugal pump impeller in the channel of a system ESP. In the use of the optimization method by changing the angular parameters of the pump, the resultant data applied to the simulations allowed to obtain optimized values of the Head (lift height), lossless efficiency and the power with differentiated results.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-05-31T20:42:20Z No. of bitstreams: 1 AlexandreTorresSilvaDosSantos_TESE.pdf: 4479347 bytes, checksum: 3c5c147ce62a6256530f17e60cf8fb0f (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-06-03T00:41:26Z (GMT) No. of bitstreams: 1 AlexandreTorresSilvaDosSantos_TESE.pdf: 4479347 bytes, checksum: 3c5c147ce62a6256530f17e60cf8fb0f (MD5) / Made available in DSpace on 2016-06-03T00:41:26Z (GMT). No. of bitstreams: 1 AlexandreTorresSilvaDosSantos_TESE.pdf: 4479347 bytes, checksum: 3c5c147ce62a6256530f17e60cf8fb0f (MD5) Previous issue date: 2014-12-08 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / O objetivo deste trabalho foi determinar a variabilidade sazonal-interanual e tend?ncia da velocidade do vento e validar o modelo num?rico de mesoescala para depois acoplar com o modelo num?rico de microescala no intuito de obter recursos e?licos em algumas localidades no Nordeste do Brasil (NEB). Para isso usamos dois conjuntos de dados de velocidade do vento (esta??es meteorol?gicas e torres anemom?tricas) e dois modelos din?micos; um de mesoescala e outro de microescala. Usamos ferramentas estat?sticas para avaliar e validar os dados medidos e simulados. As simula??es do modelo din?mico de mesoescala foram realizadas atrav?s de m?todos de assimila??o de dados (relaxamento newtoniano e filtro de Kalman). Os principais resultados apontam: (i) Cinco grupos homog?neos de velocidade do vento no NEB com valores maiores no inverno e primavera e menores para ver?o e outono; (ii) A variabilidade interanual da velocidade do vento em alguns grupos se destacaram com valores maiores; (iii) A circula??o de grande escala modificada por fen?menos El Ni?o e La Ni?a alterou a intensidade da velocidade do vento para os grupos com maiores valores; (iv) A an?lise de tend?ncia mostrou valores negativos mais significativos para os grupos G3, G4 e G5 em todas as esta??es do ano e na m?dia anual; (v) O desempenho do modelo din?mico de mesoescala apresentou menores erros nas localidades Paracuru e S?o Jo?o do Cariri e maiores erros foram observados em Triunfo; (vi) Aplica??o do filtro de Kalman diminuir significativamente os erros sistem?ticos apresentados nas simula??es do modelo din?mico de mesoescala; (vii) Os recursos e?licos apontam que as ?reas Paracuru e Triunfo s?o favor?veis para gera??o de energia, sendo que a t?cnica de acoplamento ap?s valida??o apresentou melhor resultado para Paracuru. Conclu?mos que o objetivo do estudo foi alcan?ado, sendo poss?vel agora identificar tend?ncias em grupos homog?neos do comportamento do vento, al?m de avaliar ? qualidade das simula??es tanto com o modelo din?mico de mesoescala como de microescala para responder quest?es necess?rias antes de planejar projetos de pesquisas na ?rea e?lica. / The objective of this study was to determine the seasonal and interannual variability and calculate the trends of wind speed in NEB and then validate the mesoscale numerical model for after engage with the microscale numerical model in order to get the wind resource at some locations in the NEB. For this we use two data sets of wind speed (weather stations and anemometric towers) and two dynamic models; one of mesoscale and another of microscale. We use statistical tools to evaluate and validate the data obtained. The simulations of the dynamic mesoscale model were made using data assimilation methods (Newtonian Relaxation and Kalman filter). The main results show: (i) Five homogeneous groups of wind speed in the NEB with higher values in winter and spring and with lower in summer and fall; (ii) The interannual variability of the wind speed in some groups stood out with higher values; (iii) The large-scale circulation modified by the El Ni?o and La Ni?a intensified wind speed for the groups with higher values; (iv) The trend analysis showed more significant negative values for G3, G4 and G5 in all seasons and in the annual average; (v) The performance of dynamic mesoscale model showed smaller errors in the locations Paracuru and S?o Jo?o and major errors were observed in Triunfo; (vi) Application of the Kalman filter significantly reduce the systematic errors shown in the simulations of the dynamic mesoscale model; (vii) The wind resource indicate that Paracuru and Triunfo are favorable areas for the generation of energy, and the coupling technique after validation showed better results for Paracuru. We conclude that the objective was achieved, making it possible to identify trends in homogeneous groups of wind behavior, and to evaluate the quality of both simulations with the dynamic model of mesoscale and microscale to answer questions as necessary before planning research projects in Wind-Energy area in the NEB

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-08-09T22:49:24Z No. of bitstreams: 1 LeonardoJorgeBrasilDeFreitasCunha_TESE.pdf: 18700119 bytes, checksum: 099db9a5955fbcce2aa9a2d7d78f62fd (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-08-10T22:57:29Z (GMT) No. of bitstreams: 1 LeonardoJorgeBrasilDeFreitasCunha_TESE.pdf: 18700119 bytes, checksum: 099db9a5955fbcce2aa9a2d7d78f62fd (MD5) / Made available in DSpace on 2016-08-10T22:57:29Z (GMT). No. of bitstreams: 1 LeonardoJorgeBrasilDeFreitasCunha_TESE.pdf: 18700119 bytes, checksum: 099db9a5955fbcce2aa9a2d7d78f62fd (MD5) Previous issue date: 2016-04-12 / No trabalho apresentam-se os resultados da pesquisa que aborda o desempenho da compartimenta??o horizontal seletiva na promo??o da Seguran?a Contra Inc?ndio em Edifica??es - SCIE. A compartimenta??o horizontal ? uma medida de prote??o passiva de total controle por parte do arquiteto, pass?vel de ser definida logo nas primeiras fases do processo projetual. Contudo, nota-se uma cont?nua reconfigura??o dos ambientes em edifica??es acad?micas, objetivando ajust?-los ? demanda surgente por espa?o. Assim, um determinado ambiente concebido inicialmente como uma ampla sala de aula pode se transformar em duas ou mais salas menores, por exemplo. Independentemente do momento em que ocorre a subdivis?o, seja na fase de projeto ou durante a ocupa??o da edifica??o, as normas s? consideram o ambiente compartimentado quando s?o empregados os elementos classificados como corta-fogo. Entretanto, considerando que os minutos iniciais de um inc?ndio s?o os mais importantes na prote??o a vida, trabalhou-se a hip?tese de que uma forma de particionamento ignorado pelas prescri??es normativas ? capaz de favorecer a evacua??o e o resgate dos ocupantes ao promover exaust?o da fuma?a no ambiente incendiado. A partir de um modelo representativo de um ambiente acad?mico constru?do, utilizou-se a simula??o computacional para testar o desempenho de um tipo de compartimenta??o horizontal seletiva com diferentes combina??es de aberturas para exaust?o da fuma?a. Nos resultados obtidos demonstrou-se que a compartimenta??o horizontal seletiva ? capaz de promover benef?cios para os ocupantes durante a evacua??o, tanto por promover maior altura da camada livre de fuma?a, quanto por retardar o instante em que a temperatura limite para a sobreviv?ncia humana ? atingida. / The thesis presents the results of research that addresses the performance of selective horizontal partitioning to promote Fire Safety in Buildings - FSB. Horizontal partitioning is a passive protection measure, settable in the early stages of the design process and controlled by the architect. However, there is a frequent reconfiguration of the rooms in academic buildings to adjust them for the space demand. Thus, large classrooms could turn into two or more smaller rooms, for example. Regardless when the subdivision occurs in the design phase or during the occupation of the building, the regulations just ensures the compartimentation of the room if all fireguard devices are present in the room. Knowing the fire's first minutes are the most important for life protection, we defend the hypothesis that a kind of partitioning ignored by regulatory standards is able to favoring the building vacancy and occupants rescue, for promote the room?s smoke exhaust. The performance of the selective horizontal partitioning due different blend of openings for smoke outlet was simulated on CFD software. The results indicate that selective horizontal partitioning is able to promote an upper smoke free layer and delay the indoor temperature growth.

Made available in DSpace on 2014-12-17T14:55:51Z (GMT). No. of bitstreams: 1 MarceloHRN_DISSERT.pdf: 1910960 bytes, checksum: 696b69a0c65216fcf9b33e58073b32ab (MD5) Previous issue date: 2012-08-05 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / This dissertation describes the implementation of a WirelessHART networks simulation module for the Network Simulator 3, aiming for the acceptance of both on the present context of networks research and industry. For validating the module were imeplemented tests for attenuation, packet error rate, information transfer success rate and battery duration per station / Esta disserta??o descreve a implementa??o de um m?dulo de simula??o para redes WirelessHART, utilizando o simulador de redes Network Simulator 3, tendo em vista a aceita??o que ambos possuem no atual contexto de pesquisa e na ind?stria. Para valida??o do m?dulo foram implementados testes quanto a atenua??o dos sinais transmitidos, probabilidade de perda pacotes (Packet Error Rate PER), probabilidade de que uma informa??o produzida seja recebida no destino e dura??o da bateria nas esta??es