Energy storage devices are generally evaluated on two main requirements; power and energy. In supercapacitors these two performance criteria are altered by the capacitance, resistance and voltage. (For complete abstract open document)

Este trabalho apresenta a otimização de sistemas de acumulação sensível de energia térmica, submetidos a fontes de energia intermitentes (solar). Este tipo de sistema de acumulação é definido pelo seu material de acumulação e pelo fluido de trabalho, que realiza o transporte da energia. A metodologia empregada consiste em aplicar o modelo da capacitância global para descrever o comportamento dinâmico do material de acumulação, disposto na forma de placas planas paralelas, enquanto que o fluido de trabalho foi modelado via balanço de energia. O material de acumulação foi dividido em diversas seções menores, de modo a satisfazer a condição de validade do modelo da capacitância global, resultando em números de Biot menores ou iguais a 0,1, para cada seção. Os parâmetros identificados para a otimização foram a geometria do material de acumulação (número de placas e volume), propriedades do material de acumulação (massa específica e calor específico) e vazão do fluido de trabalho. Definiu-se a função a ser minimizada como o módulo da diferença entre a taxa de energia de saída do sistema de acumulação e a taxa de energia de saída alvo. Os resultados para duas geometrias e materiais distintos (aço AISI304 e granito), foram comparados com simulações efetuadas com o software comercial COMSOL, e os desvios encontrados ficaram na faixa de 10,16% a 8,88% para o aço e de 1,45% a 0,25% para o granito. A formulação proposta neste trabalho foi implementada no programa Engineering Equation Solver (EES), e otimizada com algoritmos genéticos. Observou-se que a massa específica e o calor específico são parâmetros que podem ser avaliados pelo seu produto (capacidade térmica volumétrica), quando a massa do material de acumulação não foi fixada. Para os casos nos quais a massa foi definida, o calor específico e a massa específica devem ser considerados parâmetros independentes, pois cada um atuou de forma diferente sobre o sistema. Observou-se que aumentando a quantidade de parâmetros de otimização, a diferença entre a taxa de energia na saída e a mesma taxa alvo diminuiu. Na simulação com dois parâmetros de otimização, a diferença relativa máxima entre estas taxas foi de 50%, enquanto que para quatro parâmetros de otimização, este valor caiu para 24%. / This work presents the optimization of sensible heat storage system, subjected to intermittent energy sources (solar). This type of storage system is defined by its storage material and the working fluid, which transports the energy. The methodology consists of using the global capacitance method to describe the dynamic behavior of the storage material, disposed in the form of parallel flat plates, while the working fluid was modeled via an energy balance. The storage material was divided into several smaller sections in order to satisfy the validity condition of the global capacitance model, resulting in Biot numbers smaller or equal than 0.1 for each section. The optimized parameters were the geometry of the storage material (number of plates and volume), the storage material properties (mass and specific heat) and flow rate of the working fluid. The minimized objective function is the difference between the output energy rate of the storage system and the target output energy rate. The results for two different geometries and materials (steel AISI304 and granite), were compared to simulations performed with the commercial software COMSOL, and the deviations were found in the range of 10.16% to 8.88% for steel and 1,45% to 0.25% for granite. The formulation proposed in this paper is implemented in the Engineering Equation Solver (EES), and optimized with genetic algorithm. It was observed that the density and specific heat are parameters that can be evaluated for its product (volumetric heat capacity) when the mass of the storage material was not defined. For the cases where the mass was defined, the specific heat and the density should be considered independent parameters, as each one act differently in the system. It was observed that increasing the number of optimized parameters, the difference between the output energy rate and the same target rate decreased. In the simulation with two optimized parameters, the maximum relative difference between these rates was 50%, while for four optimized parameters, this value dropped to 24%.

Este trabalho apresenta a otimização de sistemas de acumulação sensível de energia térmica, submetidos a fontes de energia intermitentes (solar). Este tipo de sistema de acumulação é definido pelo seu material de acumulação e pelo fluido de trabalho, que realiza o transporte da energia. A metodologia empregada consiste em aplicar o modelo da capacitância global para descrever o comportamento dinâmico do material de acumulação, disposto na forma de placas planas paralelas, enquanto que o fluido de trabalho foi modelado via balanço de energia. O material de acumulação foi dividido em diversas seções menores, de modo a satisfazer a condição de validade do modelo da capacitância global, resultando em números de Biot menores ou iguais a 0,1, para cada seção. Os parâmetros identificados para a otimização foram a geometria do material de acumulação (número de placas e volume), propriedades do material de acumulação (massa específica e calor específico) e vazão do fluido de trabalho. Definiu-se a função a ser minimizada como o módulo da diferença entre a taxa de energia de saída do sistema de acumulação e a taxa de energia de saída alvo. Os resultados para duas geometrias e materiais distintos (aço AISI304 e granito), foram comparados com simulações efetuadas com o software comercial COMSOL, e os desvios encontrados ficaram na faixa de 10,16% a 8,88% para o aço e de 1,45% a 0,25% para o granito. A formulação proposta neste trabalho foi implementada no programa Engineering Equation Solver (EES), e otimizada com algoritmos genéticos. Observou-se que a massa específica e o calor específico são parâmetros que podem ser avaliados pelo seu produto (capacidade térmica volumétrica), quando a massa do material de acumulação não foi fixada. Para os casos nos quais a massa foi definida, o calor específico e a massa específica devem ser considerados parâmetros independentes, pois cada um atuou de forma diferente sobre o sistema. Observou-se que aumentando a quantidade de parâmetros de otimização, a diferença entre a taxa de energia na saída e a mesma taxa alvo diminuiu. Na simulação com dois parâmetros de otimização, a diferença relativa máxima entre estas taxas foi de 50%, enquanto que para quatro parâmetros de otimização, este valor caiu para 24%. / This work presents the optimization of sensible heat storage system, subjected to intermittent energy sources (solar). This type of storage system is defined by its storage material and the working fluid, which transports the energy. The methodology consists of using the global capacitance method to describe the dynamic behavior of the storage material, disposed in the form of parallel flat plates, while the working fluid was modeled via an energy balance. The storage material was divided into several smaller sections in order to satisfy the validity condition of the global capacitance model, resulting in Biot numbers smaller or equal than 0.1 for each section. The optimized parameters were the geometry of the storage material (number of plates and volume), the storage material properties (mass and specific heat) and flow rate of the working fluid. The minimized objective function is the difference between the output energy rate of the storage system and the target output energy rate. The results for two different geometries and materials (steel AISI304 and granite), were compared to simulations performed with the commercial software COMSOL, and the deviations were found in the range of 10.16% to 8.88% for steel and 1,45% to 0.25% for granite. The formulation proposed in this paper is implemented in the Engineering Equation Solver (EES), and optimized with genetic algorithm. It was observed that the density and specific heat are parameters that can be evaluated for its product (volumetric heat capacity) when the mass of the storage material was not defined. For the cases where the mass was defined, the specific heat and the density should be considered independent parameters, as each one act differently in the system. It was observed that increasing the number of optimized parameters, the difference between the output energy rate and the same target rate decreased. In the simulation with two optimized parameters, the maximum relative difference between these rates was 50%, while for four optimized parameters, this value dropped to 24%.

abstract: Shunt capacitors are often added in transmission networks at suitable locations to improve the voltage profile. In this thesis, the transmission system in Arizona is considered as a test bed. Many shunt capacitors already exist in the Arizona transmission system and more are planned to be added. Addition of these shunt capacitors may create resonance conditions in response to harmonic voltages and currents. Such resonance, if it occurs, may create problematic issues in the system. It is main objective of this thesis to identify potential problematic effects that could occur after placing new shunt capacitors at selected buses in the Arizona network. Part of the objective is to create a systematic plan for avoidance of resonance issues. For this study, a method of capacitance scan is proposed. The bus admittance matrix is used as a model of the networked transmission system. The calculations on the admittance matrix were done using Matlab. The test bed is the actual transmission system in Arizona; however, for proprietary reasons, bus names are masked in the thesis copy in-tended for the public domain. The admittance matrix was obtained from data using the PowerWorld Simulator after equivalencing the 2016 summer peak load (planning case). The full Western Electricity Coordinating Council (WECC) system data were used. The equivalencing procedure retains only the Arizona portion of the WECC. The capacitor scan results for single capacitor placement and multiple capacitor placement cases are presented. Problematic cases are identified in the form of ‘forbidden response. The harmonic voltage impact of known sources of harmonics, mainly large scale HVDC sources, is also presented. Specific key results for the study indicated include: • The forbidden zones obtained as per the IEEE 519 standard indicates the bus 10 to be the most problematic bus. • The forbidden zones also indicate that switching values for the switched shunt capacitor (if used) at bus 3 should be should be considered carefully to avoid resonance condition from existing. • The highest sensitivity of 0.0033 per unit for HVDC sources of harmonics was observed at bus 7 when all the HVDC sources were active at the same time. / Dissertation/Thesis / Masters Thesis Electrical Engineering 2015

Alternative diesel fuels have been the subject of extensive investigation. Fatty acid methyl ester (FAME) based Biodiesel manufactured from vegetable oils or animal fats is an excellent candidate to replace common diesel fuel being renewable, non-toxic and often giving rise to reduced exhaust gas emissions. The transesterification process has been commonly and widely used to produce biodiesel from vegetable oil or animal fat. Vegetable oils or animal fats generally have viscosities higher than standard diesel oil. This means that it is necessary to reduce the viscosity by means of reacting vegetable oil with alcohol in the presence of a suitable catalyst. The target product for this reaction is methyl ester, with glycerol and potentially soap produced as by products with the process of transesterification. Methylester (Biodiesel) is produced by converting triglycerides to alkylesters. A batch transesterification process has two significant mechanisms, and exhibits a mass transfer controlled region that precedes a second order kinetically controlled region. In order to control the conversion process it is useful to employ process monitoring. In particular monitoring of the mass transfer processes that limits the initial reaction rates could prove to be beneficial in allowing for process optimization and control. This thesis proposes the use of a new method of biodiesel process monitoring using low frequency (15kHz) impedance sensing which is able to provide information regarding the progress of mass transfer and chemical reaction during biodiesel production. An interdigitated (ID) sensor has been used to monitoring the biodiesel process The ID sensor is of simple construction and consists of two sets of interleaved electrodes (fingers). The two sets of electrodes are separated by a gap and when an AC excitation voltage is applied across the interleaved electrodes an oscillating electric field is developed. The response of the fluid surrounding the sensor to the applied excitation was then used to determine progress of the chemical reaction by evaluating the real and complex impedance. A significant and unambiguous change in the components of impedance has been shown to occur during mixing (mass transfer) and transesterification. The impedance measurements gained during transesterification were then used for the development of a system model. A systematic approach was used to select mathematical models and system identification techniques were evaluated. The system identification investigation used real process measurement data in conjunction with the Matlab system identification toolbox.

Submitted by Aelson Maciera (aelsoncm@terra.com.br) on 2018-01-30T18:05:32Z No. of bitstreams: 1 DissLGS.pdf: 2155036 bytes, checksum: 4c911a16fe73eab82ffa8f50ed502246 (MD5) / Approved for entry into archive by Ronildo Prado (bco.producao.intelectual@gmail.com) on 2018-01-31T13:06:35Z (GMT) No. of bitstreams: 1 DissLGS.pdf: 2155036 bytes, checksum: 4c911a16fe73eab82ffa8f50ed502246 (MD5) / Approved for entry into archive by Ronildo Prado (bco.producao.intelectual@gmail.com) on 2018-01-31T13:06:45Z (GMT) No. of bitstreams: 1 DissLGS.pdf: 2155036 bytes, checksum: 4c911a16fe73eab82ffa8f50ed502246 (MD5) / Made available in DSpace on 2018-01-31T13:10:04Z (GMT). No. of bitstreams: 1 DissLGS.pdf: 2155036 bytes, checksum: 4c911a16fe73eab82ffa8f50ed502246 (MD5) Previous issue date: 2017-03-13 / Não recebi financiamento / Agriculture is a very important economic activity in Brazil, and almost all cultures are grown directly on the soil. Thus, improve the knowledge of soil behavior is fundamental for the improvement of agricultural practices potentially harmful to the environment. The acric Oxisols are highly weathered soils, present in large and important productive productive regions of Brazil, and there are few studies using surface complexation models for description of ion adsorption processes in these soils. This work aimed at verifying the adequacy of the constant capacitance model in describing the adsorption of copper, cadmium, nickel and zinc in Latosols acric. This verification was done by analysing simulation residues and comparing surface potencial simuations with the values of PESN. All cations used are plant nutrients or important trace elements with respect to environmental contamination. In this work three soils were considered,Oxisol acric (LVwf), Oxisoil acric (LAw) and Eutric Kandiudalf (NVef). Measurements of their chemical (CEC, pH, Organic carbon, etc,), mineralogical (kaolinite and gibbsite) and physical (distribution of particle size and specific surface area) properties as well as adsorption, were obtained from literature. The adsorption envelope measurements collected in the literature were generally very consistent, and the cadmium and zinc measures are more behaved distribution in relation to other cations. Capacitance constant model were performed by a iterative computer program named FITQL. The constant capacitance model proved reasonably adequate to simulate the behavior of all the cations of the study. Simulations for nickel were relatively inconsistent regarding the experimental measurements. In most cases it was not possible to make appropriate distinctions between measurements and simulations for surface and depth, between the three concentrations of supporting electrolyte. All simulations of waste presented well-defined structure, unlike that normally expected. This may occur mainly due to methodological errors or errors inherent to the model, however, examples were not found in the literature regarding the waste generated by the simulation model for a proper comparison. / No Brasil a agricultura é uma atividade econômica muito relevante, sendo que quase todas as culturas são cultivadas diretamente sobre os solos. Assim, compreender melhor o comportamento dos solos é fundamental para o aperfeiçoamento de práticas agrícolas potencialmente danosas ao ambiente. Os Latossolos ácricos são solos muito intemperizados, presentes em extensas regiões produtivas do Brasil, sendo escassos os estudos que utilizam modelos de complexação de superfície para descrição dos processos de adsorção de íons nestes solos. O objetivo do trabalho foi verificar a adequação do modelo de capacitância constante na descrição da adsorção de cátions cobre, cádmio, níquel e zinco em Latossolos ácricos. A adequação foi verificada através dos resíduos produzidos pelas simulações e através da comparação das simulações de potencial de carga superficial com os valores de ponto de efeito salino nulo (PESN). Todos os cátions utilizados são nutrientes das plantas ou elementos traço importantes com relação a contaminação do meio ambiente. Neste trabalho três solos foram considerados, Latossolo Vermelho distroférrico ácrico (LVwf), Latossolo Amarelo ácrico (LAw) e Nitossolo Vermelho eutroférrico (NVef). Medidas de seus atributos químicos (CTC, pH em água e em solução de KCl 0; 1 molL1, carbono orgânico etc), mineralógicos (caulinita e gibbsita) e físicos (distribuição do tamanho das partículas e superfície específica), assim como envelopes de adsorção para os cátions, foram obtidas na literatura. As medidas de envelope de adsorção coletadas na literatura foram, em geral, muito consistentes, sendo que as medidas de cádmio e zinco apresentam distribuição mais uniforme que as medidas dos demais cátions. As simulações do modelo de capacitância constante foram realizadas com um programa de computador iterativo chamado FITQL. O modelo de capacitância constante se mostrou razoavelmente adequado para simular o comportamento de todos os cátions do estudo. As simulações realizadas para o níquel foram relativamente inconsistentes em relação as medidas experimentais. Na maior parte dos casos não foi possível fazer distinções adequadas entre as medidas e as simulações realizadas para superfície e profundidade, ou entre as três concentrações do eletrólito suporte. Todos os resíduos das simulações apresentaram estrutura bem definida, ao contrário do que normalmente se espera. Isto pode ocorrer, principalmente, devido a erros metodológicos ou erros inerentes ao próprio modelo, entretanto, não foram encontrados exemplos na literatura a respeito dos resíduos das simulações geradas pelo modelo para uma comparação adequada.

Orientador: Paulo Roberto Bueno / Coorientador: Flávio Cesar Bedatty Fernandes / Banca: Maria Del Pilar Taboada Sotomayor / Banca: Paulo Inácio da Costa / Resumo: O sucesso no tratamento de muitos tipos doenças passa pela detecção seletiva e sensível de biomarcadores proteicos que permitam um diagnóstico precoce. A dengue é uma doença infecciosa de diagnóstico clínico impreciso e diagnóstico laboratorial demorado e custoso, a qual não possui tratamento ou vacina efetivos. Portanto se requer de ferramentas diagnósticas precisas, baratas e portáveis que permitam o diagnóstico rápido para realizar um tratamento adequado de sintomas e identificar os focos infecciosos para prevenir o espalhamento da doença. Um biomarcador útil na detecção da dengue, é a proteína NS1 que vem sendo utilizada com sucesso em diferentes plataformas de diagnóstico. Porém, nenhuma das plataformas oferecidas a nível comercial, consegue combinar a precisão, portabilidade, baixo custo e facilidade de manuseio. Portanto, o melhoramento de ditas ferramentas é o foco de bastantes pesquisas. Neste trabalho se apresenta uma plataforma que se amostra útil para a detecção de diferentes biomarcadores, incluindo a proteína NS1. Esta plataforma combina o uso de uma técnica eletroquímica como é a Espectroscopia de Capacitância Eletroquímica (ECE), com o uso de peptídeos redox e está baseada na funcionalização de eletrodos de ouro mediante formação de monocamadas auto-organizadas (SAM) confeccionadas com um peptídeo redox (Fc-Glu-Gli-Ser-Gli-Ser-Cys) desenhado para ser ancorado em superfícies metálicas, ao mesmo tempo que tem capacidade de ancorar uma sonda redox e um biorecepto... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: Success in the treatment of many kinds of illnesses depends on the selective and sensitive detection of protein biomarkers that allow an early diagnosis. Dengue is and infectious disease of imprecise clinical diagnostic and delayed and expensive laboratorial diagnostic. This disease does not have an effective vaccine or treatment. Therefore, precise, cheap and portable diagnostic tools are necessary to allow a fast diagnostic in order to treat the symptoms, identify focuses of infection, and thus prevent the spreading of the disease. A useful biomarker in the detection of dengue is the protein NS1, which has been successfully used in different diagnostic platforms. However, none of the commercially available platforms combines precision, portability, low cost and user friendliness. Consequently, the improvement of such tools is object of ample research. This work, introduces a platform, which is useful for the detection of various biomarkers, including the protein NS1. This platform combines the usage of an electrochemical technique such as Electrochemical Capacitance Spectroscopy (ECS) and the use of redox peptides. It is based in the functionalization of gold electrodes through formation of Self Assembled Monolayers (SAM) formed by a redox peptide (Fc-Glu-Gli-Ser-Gli-Ser-Cys) designed to bind to metallic surfaces as well as to anchor a redox probe and a bioreceptor in the same structure/molecule. It presents the additional advantage of forming anti-fowling SAMs, which is a ... (Complete abstract click electronic access below) / Mestre

abstract: As crystalline silicon solar cells continue to get thinner, the recombination of carriers at the surfaces of the cell plays an ever-important role in controlling the cell efficiency. One tool to minimize surface recombination is field effect passivation from the charges present in the thin films applied on the cell surfaces. The focus of this work is to understand the properties of charges present in the SiNx films and then to develop a mechanism to manipulate the polarity of charges to either negative or positive based on the end-application. Specific silicon-nitrogen dangling bonds (·Si-N), known as K center defects, are the primary charge trapping defects present in the SiNx films. A custom built corona charging tool was used to externally inject positive or negative charges in the SiNx film. Detailed Capacitance-Voltage (C-V) measurements taken on corona charged SiNx samples confirmed the presence of a net positive or negative charge density, as high as +/- 8 x 1012 cm-2, present in the SiNx film. High-energy (~ 4.9 eV) UV radiation was used to control and neutralize the charges in the SiNx films. Electron-Spin-Resonance (ESR) technique was used to detect and quantify the density of neutral K0 defects that are paramagnetically active. The density of the neutral K0 defects increased after UV treatment and decreased after high temperature annealing and charging treatments. Etch-back C-V measurements on SiNx films showed that the K centers are spread throughout the bulk of the SiNx film and not just near the SiNx-Si interface. It was also shown that the negative injected charges in the SiNx film were stable and present even after 1 year under indoor room-temperature conditions. Lastly, a stack of SiO2/SiNx dielectric layers applicable to standard commercial solar cells was developed using a low temperature (< 400 °C) PECVD process. Excellent surface passivation on FZ and CZ Si substrates for both n- and p-type samples was achieved by manipulating and controlling the charge in SiNx films. / Dissertation/Thesis / Ph.D. Electrical Engineering 2013

O crescimento de pontos quânticos a partir do descasamento dos parâmetros de rede tem sido alvo de intensos estudos nos últimos dez anos. Conhecer as propriedades eletrônicas destes materiais é chave para a engenharia de sistemas quânticos. O objetivo deste trabalho é estudar as propriedades eletrônicas de pontos quânticos (QD) de InAS1-x Px enterrados em GaAs, através de Espectroscopia de Capacitância (CV). A Espectroscopia CV é uma técnica que permite determinar os estados eletrônicos e a distribuição de cargas do sistema. As amostras de InAS1-x Px foram crescidas por MOCVD (Low-Pressure Metalorganic Chemical Vapor Deposition) sobre um substrato de GaAs:Cr (001). A estrutura das amostras é do tipo MIS (Metal-Isolante-Semicondutor) com um contato traseiro do tipo n. As medidas de capacitância foram feitas a 4,2 K para diferentes valores de freqüência e campo magnético. A partir da dispersão dos estados confinados com o campo magnético aplicado perpendicular ao plano dos pontos quânticos, pode-se determinar, &#9690, a freqüência natural do sistema. A partir de &#9690, determinou-se &#87470, o comprimento característico da função de onda. A concordância entre os valores de &#87470 com as dimensões laterais dos pontos quânticos obtidos por microscopia eletrônica de transmissão (TEM) é boa. Finalmente, através das medidas de espectroscopia CV pode-se separar os efeitos de confinamento lateral e vertical, permitindo um melhor entendimento dos espectros de fotoluminescência (PL), assim como os detalhes da forma dos QD obtidos por TEM. / The growth of quantum dots in the Stranski-Krastranov mode has been subject of intense investigation in the last decade. Knowing the electronics properties of these materials is key for performing quantum systems engineering. The objective of this work is to study the quantum dots (QD) electronic properties of the InAS1-x Px embedded in GaAs. The study was done by capacitance spectroscopy (CV), which is an experimental tool that allows the evaluation of the electronic states and the charge distribution of a given quantum device. The samples of InAS1-x Px were grown by Low-Pressure Metalorganic Chemical Vapor Deposition on GaAs:Cr (001) substrates. They consist of metalinsulator-semiconductor structures with an n-type back contact. The measurements were performed at 4.2 K for different values of frequencies and magnetic field. From the confined states dispersion as a function of the applied magnetic field, perpendicular to the QD plane, the system natural frequency, &#9690, was determined. From the &#9690, we could determine the wave function characteristic length, &#87470. The concordance between the &#87470, values and the lateral sizes obtained by Transmission Electronic Microscopy (TEM) is good. Finally, by CV spectroscopy we could separate the lateral and vertical confinement effects, leading to a more complete understanding of the Photoluminescence (PL) spectra, as well as the details of the QD shape obtained by TEM.

Este trabalho apresenta a otimização de sistemas de acumulação sensível de energia térmica, submetidos a fontes de energia intermitentes (solar). Este tipo de sistema de acumulação é definido pelo seu material de acumulação e pelo fluido de trabalho, que realiza o transporte da energia. A metodologia empregada consiste em aplicar o modelo da capacitância global para descrever o comportamento dinâmico do material de acumulação, disposto na forma de placas planas paralelas, enquanto que o fluido de trabalho foi modelado via balanço de energia. O material de acumulação foi dividido em diversas seções menores, de modo a satisfazer a condição de validade do modelo da capacitância global, resultando em números de Biot menores ou iguais a 0,1, para cada seção. Os parâmetros identificados para a otimização foram a geometria do material de acumulação (número de placas e volume), propriedades do material de acumulação (massa específica e calor específico) e vazão do fluido de trabalho. Definiu-se a função a ser minimizada como o módulo da diferença entre a taxa de energia de saída do sistema de acumulação e a taxa de energia de saída alvo. Os resultados para duas geometrias e materiais distintos (aço AISI304 e granito), foram comparados com simulações efetuadas com o software comercial COMSOL, e os desvios encontrados ficaram na faixa de 10,16% a 8,88% para o aço e de 1,45% a 0,25% para o granito. A formulação proposta neste trabalho foi implementada no programa Engineering Equation Solver (EES), e otimizada com algoritmos genéticos. Observou-se que a massa específica e o calor específico são parâmetros que podem ser avaliados pelo seu produto (capacidade térmica volumétrica), quando a massa do material de acumulação não foi fixada. Para os casos nos quais a massa foi definida, o calor específico e a massa específica devem ser considerados parâmetros independentes, pois cada um atuou de forma diferente sobre o sistema. Observou-se que aumentando a quantidade de parâmetros de otimização, a diferença entre a taxa de energia na saída e a mesma taxa alvo diminuiu. Na simulação com dois parâmetros de otimização, a diferença relativa máxima entre estas taxas foi de 50%, enquanto que para quatro parâmetros de otimização, este valor caiu para 24%. / This work presents the optimization of sensible heat storage system, subjected to intermittent energy sources (solar). This type of storage system is defined by its storage material and the working fluid, which transports the energy. The methodology consists of using the global capacitance method to describe the dynamic behavior of the storage material, disposed in the form of parallel flat plates, while the working fluid was modeled via an energy balance. The storage material was divided into several smaller sections in order to satisfy the validity condition of the global capacitance model, resulting in Biot numbers smaller or equal than 0.1 for each section. The optimized parameters were the geometry of the storage material (number of plates and volume), the storage material properties (mass and specific heat) and flow rate of the working fluid. The minimized objective function is the difference between the output energy rate of the storage system and the target output energy rate. The results for two different geometries and materials (steel AISI304 and granite), were compared to simulations performed with the commercial software COMSOL, and the deviations were found in the range of 10.16% to 8.88% for steel and 1,45% to 0.25% for granite. The formulation proposed in this paper is implemented in the Engineering Equation Solver (EES), and optimized with genetic algorithm. It was observed that the density and specific heat are parameters that can be evaluated for its product (volumetric heat capacity) when the mass of the storage material was not defined. For the cases where the mass was defined, the specific heat and the density should be considered independent parameters, as each one act differently in the system. It was observed that increasing the number of optimized parameters, the difference between the output energy rate and the same target rate decreased. In the simulation with two optimized parameters, the maximum relative difference between these rates was 50%, while for four optimized parameters, this value dropped to 24%.